Faculty Profiles - YOSHINO Takashi

写真a

YOSHINO Takashi

Organization

Scheduled update Professor

External link

Degree

博士 (理学) ( 1998.3 東京大学 )
修士 ( 1995.3 静岡大学 )
学士 ( 1993.3 静岡大学 )

Research Interests

Experimental Petrology
transport properties
Core
Mantle
実験岩石学
Structural Petrology

Research Areas

Natural Science / Solid earth sciences / High pressure Earth and Planetary Sciences

Education

The University of Tokyo 理学系研究科地質学専攻

1995.4 - 1998.3

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Country： Japan

Notes：博士（理学）

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Shizuoka University 理学研究科地球科学科

1993.4 - 1995.3

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Shizuoka University 理学部地球科学科

1989.4 - 1993.3

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Country： Japan

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Research History

Okayama University Institute for Planetary Materials Professor

2019.4

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Okayama University Institute for Planetary Materials Associate Professor

2016.4 - 2019.3

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Okayama University Institute for Study of the Earth's Interior Associate Professor

2008.2 - 2016.3

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Okayama University Institute for Study of the Earth's Interior Institution Postdoc

2005.10 - 2008.1

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Okayama University Institute for Study of the Earth's Interior JSPS PD

2003.4 - 2005.9

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Okayama University Institute for Study of the Earth's Interior Institutional Postdoc

2001.4 - 2003.3

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The University of Tokyo Earthquake Research Institute COE researcher

1999.4 - 2001.3

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Professional Memberships

Mineralogical Society of America

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American Geophysical Union

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日本地質学会

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American Geophysical Union

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THE JAPAN SOCIETY OF HIGH PRESSURE SCIENCE AND TECHNOLOGY

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鉱物科学会

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Committee Memberships

Journal of Geophysical Research Solid Earth Associate Editor

2021.1

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Committee type：Academic society

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SPRUC研究会地球惑星科学研究会代表

2014.4 - 2020.3

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Committee type：Academic society

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日本高圧力学会評議員

2010 - 2012

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Committee type：Academic society

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日本地質学会評議員

1997 - 1998

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Committee type：Academic society

日本地質学会

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Papers

Unraveling the Complex Features of the Seismic Scatterers in the Mid‐Lower Mantle Through Phase Transition of (Al, H)‐Bearing Stishovite Reviewed

Yingxin Yu, Youyue Zhang, Luo Li, Xinyue Zhang, Denglei Wang, Zhu Mao, Ningyu Sun, Yanyao Zhang, Xinyang Li, Wancai Li, Sergio Speziale, Dongzhou Zhang, Jung‐Fu Lin, Takashi Yoshino

Geophysical Research Letters 52 ( 14 ) e2024GL114146 2025.7

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Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Publisher：American Geophysical Union (AGU)

Abstract

Small‐scale scatterers observed in the mid‐lower mantle beneath the subduction zones are thought to result from the phase transition of stishovite within subducted oceanic crusts. Here we investigate the phase transition of (Al, H)‐bearing stishovite with four compositions at simultaneously high P‐T conditions combining Raman spectroscopy and X‐ray diffraction. These experimental results reveal that the incorporation of 0.01 a.p.f.u Al into stishovite with H/Al ratio of ∼1/3 lowers the transition pressure by 6.7(3) GPa. However, the Clapeyron slope of this transition is nearly unaffected by changes in the Al content and has a value of 12.2–12.5(3) MPa/K. According to our results, Al content variation ranging from 0 to 0.07 a.p.f.u in SiO₂ can reasonably explain the depth distribution from 800 to 1,900 km of the seismic scatterers observed in the circum‐Pacific region. These results deepen our understanding on the complex features of mid‐lower mantle seismic scatterers and corresponding dynamic processes.

DOI： 10.1029/2024gl114146

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Valence/Spin States of Iron in Peridotite Glass to Megabar Pressure Implications for Dense Iron‐Rich Silicate Melt at the Bottom of the Mantle Reviewed

Izumi Mashino, Takashi Yoshino, Takaya Mitsui, Kosuke Fujiwara, Sayako Inoué, Takeshi Sakai

Geophysical Research Letters 52 ( 7 ) 1 - 11 2025.4

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Geophysical Union (AGU)

Abstract

We have conducted high‐pressure electrical conductivity and Mössbauer spectroscopic measurements of peridotite glass as an analog of silicate melts. We observed the shoulder feature in the Mössbauer spectra above 60 GPa due to the emergence of the new Fe²⁺ component, which could be associated with the change of the iron partitioning coefficient between solid and melt observed in previous melting experiments. The change in the trend of the electrical conductivity profile has been observed at around ∼83 GPa, suggesting the increase of the relative abundance of the new component. The pressure dependence of hyperfine parameters indicates the spin transitions of both Fe²⁺ and Fe³⁺ occur above 100 GPa, which is likely related to the structural change of the glass. Our results suggest that the spin state changes of iron lead to further densification of the silicate melts at the bottom of the mantle.

DOI： 10.1029/2024gl113106

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Low melt viscosity enables melt doublets above the 410-km discontinuity Reviewed

Longjian Xie, Denis Andrault, Takashi Yoshino, Cunrui Han, James O. S. Hammond, Fang Xu, Bin Zhao, Oliver T. Lord, Yingwei Fei, Simon Falvard, Sho Kakizawa, Noriyoshi Tsujino, Yuji Higo, Laura Henry, Nicolas Guignot, David P. Dobson

Nature Communications 16 ( 1 ) 2025.4

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Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

Abstract

Seismic and magnetotelluric studies suggest hydrous silicate melts atop the 410 km discontinuity form 30–100 km thick layers. Importantly, in some regions, two layers are observed. These stagnant layers are related to their comparable density to the surrounding mantle, but their formation mechanisms and detailed structures remain unclear. Here we report a large decrease of silicate melt viscosity at ~14 GPa, from 96(5) to 11.7(6) mPa⋅s, as water content increases from 15.5 to 31.8 mol% H₂O. Such low viscosities facilitate rapid segregation of melt, which would typically prevent thick layer accumulation. Our 1D finite element simulations show that continuous dehydration melting of upwelling mantle material produces a primary melt layer above 410 km and a secondary layer at the depth of equal mantle-melt densities. These layers can merge into a single thick layer under low density contrasts or high upwelling rates, explaining both melt doublets and thick single layers.

DOI： 10.1038/s41467-025-58518-7

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Other Link： https://www.nature.com/articles/s41467-025-58518-7
Grain boundary diffusion cannot explain the W isotope heterogeneities of the deep mantle Reviewed

Yihang Peng, Takashi Yoshino, Jie Deng

Nature Communications 16 ( 1 ) 2025.2

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Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

DOI： 10.1038/s41467-025-57120-1

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Other Link： https://www.nature.com/articles/s41467-025-57120-1
Aluminum and Iron Effects on the Electrical Conductivity of the Dense Hydrous Magnesium Silicate Phase E Reviewed

Bin Zhao, Izumi Mashino, Takashi Yoshino

Journal of Geophysical Research: Solid Earth 129 ( 10 ) 2024.10

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Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Publisher：American Geophysical Union (AGU)

Abstract

The electrical conductivity of pure and Al/Fe‐bearing phase E was measured up to 950 K at 15 GPa using a complex impedance spectroscopy. Pure phase E shows comparable conductivity to that of phase D, and a few orders of magnitude higher than that of phase A and super‐hydrous phase B. Al‐bearing phase E does not exhibit a conductivity difference, while a certain amount of incorporated Fe prominently increases its electrical conductivity by a factor of 4. Unlike the sole substitution 2Al³⁺→Mg²⁺+Si⁴⁺ in phase D and H, H⁺ is likely involved in the substitution. Proton conduction is the dominant conduction mechanism, while small polaron conduction becomes dominant with increasing Fe content. Phase E in subducted slabs at depth of the upper transition zone cannot explain the high electrical conductivity anomalies beneath the Philippine Sea or Northeast China. Other mechanisms such as dehydration of hydrous minerals is needed to account for them.

DOI： 10.1029/2024jb029659

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Probing Deep Hydrogen Using Electrical Conductivity Invited Reviewed

Takashi Yoshino, Geeth Manthilake, Anne Pommier

Elements 20 ( 4 ) 247 - 252 2024.8

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Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：Mineralogical Society of America

Electrical conductivity is perhaps the physical property of rocks that is most sensitive to the presence of hydrogen. Hydrogen enhances conductivity via proton conduction in minerals or by stabilizing highly conductive phases, such as hydrous silicate melts or aqueous fluids. Hydrogen might also be stored in the metallic core. Electrical conductivity measurements in the laboratory can be used to interpret magnetotelluric maps of the mantle in terms of hydrogen content and distribution. In active tectonic settings like subduction zones, anomalously high conductivities have revealed the distribution and migration pathways of H-bearing melts and fluids, illuminating the transport of hydrogen in our planet’s interior.

DOI： 10.2138/gselements.20.4.247

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Electrical conductivity of siderite and the effect of the spin transition of iron Reviewed

Izumi Mashino, Takashi Yoshino, Takaya Mitsui, Kosuke Fujiwara, Máté Garai, Shigeru Yamashita

Physics and Chemistry of Minerals 51 ( 2 ) 2024.5

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Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

Abstract

We have conducted electrical conductivity measurements of FeCO₃ siderite under high pressure up to 63 GPa in order to understand the nature and effect of iron spin transition and its influence on the geophysical properties of siderite, which is an end-member of major carbonate minerals. The results from Raman and Mössbauer spectroscopic measurements show that the high- to low-spin transition of iron occurs at around 50 GPa in agreement with previous studies. A sharp decrease of the electrical conductivity was also observed at around 50 GP, which is associated with the spin transition in iron. Although the stability of FeCO₃ siderite may be limited under high-temperature conditions along with the mantle geotherm, solid solutions in the MgCO₃-FeCO₃ system, Mg_1-xFe_xCO₃, could be stable up to the pressure-temperature condition of the lowermost mantle. The pressure-temperature range of the spin transition in Mg_1-xFe_xCO₃ is narrower than those of the major lower mantle minerals, ferropericlase and bridgmanite, and thus the drop of the electrical conductivity induced by the spin transition could be clearer under lower mantle conditions. Therefore, the existence of Mg_1-xFe_xCO₃ may affect the observed heterogeneity of electrical conductivity in the mid-lower mantle.

DOI： 10.1007/s00269-024-01283-8

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Other Link： https://link.springer.com/article/10.1007/s00269-024-01283-8/fulltext.html
A thermally conductive Martian core and implications for its dynamo cessation Reviewed

Wen-Pin Hsieh, Frédéric Deschamps, Yi-Chi Tsao, Takashi Yoshino, Jung-Fu Lin

Science Advances 10 ( 12 ) 2024.3

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Publishing type：Research paper (scientific journal) Publisher：American Association for the Advancement of Science (AAAS)

Mars experienced a dynamo process that generated a global magnetic field ~4.3 (or earlier) to 3.6 billion years ago (Ga). The cessation of this dynamo strongly affected Mars’ history and is expected to be linked to thermochemical evolution of Mars’ iron-rich liquid core, which is strongly influenced by its thermal conductivity. Here, we directly measured thermal conductivities of solid iron-sulfur alloys to pressures relevant to the Martian core and temperatures to 1023 Kelvin. Our results show that a Martian core with 16 weight % sulfur has a thermal conductivity of ~19 to 32 Watt meter ⁻¹ Kelvin ⁻¹ from its top to the center, much higher than previously inferred from electrical resistivity measurements. Our modeled thermal conductivity profile throughout the Martian deep-mantle and core indicates a ~4- to 6-fold discontinuity across the core-mantle boundary. The core’s efficient cooling resulting from the depth-dependent, high conductivity diminishes thermal convection and forms thermal stratification, substantially contributing to cessation of Martian dynamo.

DOI： 10.1126/sciadv.adk1087

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Wetting property of Fe‐S melt in solid core: Implication for the core crystallization process in planetesimals Reviewed

Shiori Matsubara, Hidenori Terasaki, Takashi Yoshino, Satoru Urakawa, Daisuke Yumitori

Meteoritics & Planetary Science 2024.3

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Publishing type：Research paper (scientific journal) Publisher：Wiley

Abstract

In differentiated planetesimals, the liquid core starts to crystallize during secular cooling, followed by the separation of liquid–solid phases in the core. The wetting property between liquid and solid iron alloys determines whether the core melts are trapped in the solid core or they can separate from the solid core during core crystallization. In this study, we performed high‐pressure experiments under the conditions of the interior of small bodies (0.5–3.0 GPa) to study the wetting property (dihedral angle) between solid Fe and liquid Fe‐S as a function of pressure and duration. The measured dihedral angles are approximately constant after 2 h and decrease with increasing pressure. The dihedral angles range from 30° to 48°, which are below the percolation threshold of 60° at 0.5–3.0 GPa. The oxygen content in the melt decreases with increasing pressure and there are strong positive correlations between the S + O or O content and the dihedral angle. Therefore, the change in the dihedral angle is likely controlled by the O content of the Fe‐S melt, and the dihedral angle tends to decrease with decreasing O content in the Fe‐S melt. Consequently, the Fe‐S melt can form interconnected networks in the solid core. In the obtained range of the dihedral angle, a certain amount of the Fe‐S melt can stably coexist with solid Fe, which would correspond to the “trapped melt” in iron meteorites. Excess amounts of the melt would migrate from the solid core over a long period of core crystallization in planetesimals.

DOI： 10.1111/maps.14149

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Some new insights about electrical discontinuities in the cratonic lithosphere Reviewed

Baohua Zhang, Hongzhan Fei, Takashi Yoshino, Qunke Xia

Earth-Science Reviews 104592 - 104592 2023.10

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Publishing type：Research paper (scientific journal) Publisher：Elsevier BV

DOI： 10.1016/j.earscirev.2023.104592

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Effect of water on seismic attenuation of the upper mantle: The origin of the sharp lithosphere–asthenosphere boundary Reviewed

Chao Liu, Takashi Yoshino, Daisuke Yamazaki, Noriyoshi Tsujino, Hitoshi Gomi, Moe Sakurai, Youyue Zhang, Ran Wang, Longli Guan, Kayan Lau, Yoshinori Tange, Yuji Higo

Proceedings of the National Academy of Sciences 120 ( 32 ) 2023.7

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Language：English Publishing type：Research paper (scientific journal) Publisher：Proceedings of the National Academy of Sciences

Oceanic lithosphere moves over a mechanically weak layer (asthenosphere) characterized by low seismic velocity and high attenuation. Near mid-ocean ridges, partial melting can produce such conditions because of the high-temperature geotherm. However, seismic observations have also shown a large and sharp velocity reduction under oceanic plates at the lithosphere–asthenosphere boundary (LAB) far from mid-ocean ridges. Here, we report the effect of water on the seismic properties of olivine aggregates in water-undersaturated conditions at 3 GPa and 1,223 to 1,373 K via in-situ X-ray observation using cyclic loading. Our results show that water substantially enhances the energy dispersion and reduces the elastic moduli over a wide range of seismic frequencies (0.5 to 1,000 s). An attenuation peak that appears at higher frequencies (1 to 5 s) becomes more pronounced as the water content increases. If water exists only in the asthenosphere, this is consistent with the observation that the attenuation in the asthenosphere is almost constant over a wide frequency range. These sharp seismic changes at the oceanic LAB far from mid-ocean ridges could be explained by the difference in water content between the lithosphere and asthenosphere.

DOI： 10.1073/pnas.2221770120

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Preliminary results from the new deformation multi-anvil press at the photon factory: Insight into the creep strength of calcium silicate perovskite Reviewed

Andrew R. Thomson, Yu Nishihara, Daisuke Yamazaki, Noriyoshi Tsujino, Simon A. Hunt, Yumiko Tsubokawa, Kyoko Matsukage, Takashi Yoshino, Tomoaki Kubo, David P. Dobson

Core-Mantle Coevolution: A Multidisciplinary Approach 59 - 73 2023.6

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Publishing type：Part of collection (book)

DOI： 10.1002/9781119526919.ch04

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Rheology of hexagonal close‐packed(hcp) iron Reviewed

Yu Nishihara, Shunta Doi, Noriyoshi Tsujino, Daisuke Yamazaki, Kyoko N. Matsukage, Yumiko Tsubokawa, Takashi Yoshino, Andrew R. Thomson, Yuji Higo, Yoshinori Tange

Journal of Geophysical Research: Solid Earth 128 ( 6 ) e2022JB026165 2023.5

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Publishing type：Research paper (scientific journal) Publisher：American Geophysical Union (AGU)

DOI： 10.1029/2022jb026165

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Hadean mantle oxidation inferred from melting of peridotite under lower-mantle conditions Reviewed

Hideharu Kuwahara, Ryoichi Nakada, Shintaro Kadoya, Takashi Yoshino, Tetsuo Irifune

Nature Geoscience https://doi.org/10.1038/s41561-023-01169-4 2023.5

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Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

DOI： 10.1038/s41561-023-01169-4

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Other Link： https://www.nature.com/articles/s41561-023-01169-4
Investigation of Solid‐Solid Transition in Ti and Zr at High Pressure by Electrical Resistivity Reviewed

Innocent C. Ezenwa, Takashi Yoshino

physica status solidi (b) 2023.4

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Authorship：Last author Publishing type：Research paper (scientific journal) Publisher：Wiley

DOI： 10.1002/pssb.202300079

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Effect of Iron Content on Thermal Conductivity of Ferropericlase: Implications for Planetary Mantle Dynamics Reviewed

Youyue Zhang, Takashi Yoshino, Masahiro Osako

Geophysical Research Letters 50 ( 7 ) 2023.3

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Publishing type：Research paper (scientific journal) Publisher：American Geophysical Union (AGU)

DOI： 10.1029/2022gl101769

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Interaction of carbonates with peridotite containing iron metal: Implications for carbon speciation in the upper mantle Reviewed

N.S. Martirosyan, A. Shatskiy, K.D. Litasov, I.S. Sharygin, T. Yoshino

Lithos 428-429 106817 - 106817 2022.11

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Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier BV

DOI： 10.1016/j.lithos.2022.106817

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Editorial: Water in the Earth’s interior Reviewed

Hongzhan Fei, Baohua Zhang, Jia Liu, Takashi Yoshino

Frontiers in Earth Science 10 2022.10

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Authorship：Last author Publishing type：Research paper (scientific journal) Publisher：Frontiers Media SA

DOI： 10.3389/feart.2022.1030793

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Viscosity of bridgmanite determined by in situ stress and strain measurements in uniaxial deformation experiments Reviewed

Noriyoshi Tsujino, Daisuke Yamazaki, Yu Nishihara, Takashi Yoshino, Yuji Higo, Yoshinori Tange

Science Advances 8 ( 13 ) 2022.4

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Publishing type：Research paper (scientific journal) Publisher：American Association for the Advancement of Science (AAAS)

DOI： 10.1126/sciadv.abm1821

Scopus

PubMed

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Partial dehydration of brucite and its implications for water distribution in the subducting oceanic slab Reviewed

Xinzhuan Guo, Takashi Yoshino, Sibo Chen, Xiang Wu, Junfeng Zhang

Geoscience Frontiers 13 ( 2 ) 101342 - 101342 2022.3

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Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier BV

DOI： 10.1016/j.gsf.2021.101342

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Oxidation Extent of the Upper Mantle by Subducted Slab and Possible Oxygen Budget in Deep Earth Inferred From Redox Kinetics of Olivine Reviewed

Chengcheng Zhao, Takashi Yoshino, Baohua Zhang

Journal of Geophysical Research: Solid Earth 127 ( 2 ) 2022.2

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Geophysical Union (AGU)

DOI： 10.1029/2021jb022977

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Other Link： https://onlinelibrary.wiley.com/doi/full-xml/10.1029/2021JB022977
Exploration of the best reference material on anelastic measurement by cyclic loading under high pressure Reviewed

Chao Liu, Takashi Yoshino, Daisuke Yamazaki, Noriyoshi Tsujino, Hitoshi Gomi, Moe Sakurai, Youyue Zhang, Ran Wang, Longli Guan, Kayan Lau, Yoshinori Tange, Yuji Higo

High Pressure Research 42 ( 1 ) 1 - 15 2021.12

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1080/08957959.2021.2013834

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Incorporation mechanism of Fe and Al into bridgmanite in a subducting mid-ocean ridge basalt and its crystal chemistry Reviewed International journal

Akihiko Nakatsuka, Hiroshi Fukui, Seiji Kamada, Naohisa Hirao, Makio Ohkawa, Kazumasa Sugiyama, Takashi Yoshino

Scientific Reports 11 ( 1 ) 22839 - 22839 2021.12

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Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

<title>Abstract</title>The compositional difference between subducting slabs and their surrounding lower-mantle can yield the difference in incorporation mechanism of Fe and Al into bridgmanite between both regions, which should cause heterogeneity in physical properties and rheology of the lower mantle. However, the precise cation-distribution has not been examined in bridgmanites with Fe- and Al-contents expected in a mid-ocean ridge basalt component of subducting slabs. Here we report on Mg_0.662Fe_0.338Si_0.662Al_0.338O₃ bridgmanite single-crystal characterized by a combination of single-crystal X-ray diffraction, synchrotron ⁵⁷Fe-Mössbauer spectroscopy and electron probe microanalysis. We find that the charge-coupled substitution ^AMg²⁺ + ^BSi⁴⁺ ↔ ^AFe³⁺(high-spin) + ^BAl³⁺ is predominant in the incorporation of Fe and Al into the practically eightfold-coordinated A-site and the sixfold-coordinated B-site in bridgmanite structure. The incorporation of both cations via this substitution enhances the structural distortion due to the tilting of BO₆ octahedra, yielding the unusual expansion of mean <A–O> bond-length due to flexibility of A–O bonds for the structural distortion, in contrast to mean <B–O> bond-length depending reasonably on the ionic radius effect. Moreover, we imply the phase-transition behavior and the elasticity of bridgmanite in slabs subducting into deeper parts of the lower mantle, in terms of the relative compressibility of AO₁₂ (practically AO₈) and BO₆ polyhedra.

DOI： 10.1038/s41598-021-00403-6

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Other Link： https://www.nature.com/articles/s41598-021-00403-6
Thermal equation of state of F-bearing superhydrous phase B (Mg10Si3O14(OH,F)4): Implications for the transportation of fluorine and water into the lower mantle Reviewed

Xiang Li, Yungui Liu, Ran Wang, Takashi Yoshino, Jingui Xu, Dongzhou Zhang, Tobias Grützner, Junfeng Zhang, Xiang Wu

Physics of the Earth and Planetary Interiors 106824 - 106824 2021.11

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Publishing type：Research paper (scientific journal) Publisher：Elsevier BV

DOI： 10.1016/j.pepi.2021.106824

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Electrical Resistivity of Cu and Au at High Pressure above 5 GPa: Implications for the Constant Electrical Resistivity Theory along the Melting Curve of the Simple Metals Reviewed

IC Ezenwa, T. Yoshino

Materials 14 5476 2021.10

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Authorship：Last author Language：English Publishing type：Research paper (scientific journal)

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Electrical conductivity of diaspore, δ-AlOOH and ε-FeOOH Reviewed

Ran Wang, Takashi Yoshino

American Mineralogist 106 ( 5 ) 774 - 781 2021.5

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Authorship：Last author Publishing type：Research paper (scientific journal) Publisher：Mineralogical Society of America

<title>Abstract</title>
Electrical conductivities of diaspore (α-AlOOH), δ-AlOOH, and ε-FeOOH were measured by impedance spectroscopy with a frequency range from 10–1 to 106 Hz at pressures from 8 to 20 GPa and temperatures from 500 to 1200 K, well below the dehydration temperatures of these phases at the relevant pressures. For diaspore, the relationship between electrical conductivity and reciprocal temperature can be well fitted by the Arrhenius formula:

σ = σ 0 exp ⁡ [ − ( Δ E + P Δ V ) k T ] ,

where σ0 is the pre-exponential factor, ∆E is the activation energy, and ∆V is activation volume of 56.0 ± 1.2 S/m, 0.55 ± 0.02 eV, and 1.68 ± 0.12 cm3/mol, respectively. The electrical conductivity of diaspore decreases with increasing pressure ranging from 8 to 12 GPa by a half order of magnitude, whereas the conductivity becomes almost constant in a pressure range above 12 GPa. δ-AlOOH and ε-FeOOH show one and two orders of magnitude higher electrical conductivity than diaspore. Electrical conductivities of δ-AlOOH and ε-FeOOH, which have isostructural CaCl2-type hydroxide structure, show the nearly identical activation enthalpies (0.38 ± 0.01, 0.33 ± 0.05 eV), which are relatively lower than that of diaspore. The dominant conduction mechanism of AlOOH phases can be regarded as proton conduction. The conductivity difference between diaspore and δ-AlOOH attributes to result in the different O1H bond lengths of each phase. The reduction of O1H bond length with increasing pressure could enhance the proton migration by reducing the potential barrier, thereby raising the electrical conductivity. Small polaron conduction may contribute to the conductivity of ε-FeOOH to generate higher conductivity than δ-AlOOH. Furthermore, hydrogen bond symmetrization will also play an important role in the conductivity discrepancy of these hydrous minerals with CaCl2-type hydroxide structure. For subducted sedimentary rocks, polymorphs of AlOOH and FeOOH are representative hydrous phases. Al-rich sediments show conductivity reduction with increasing depth until phase transformation occurs because diaspore represents negative pressure dependence of conductivity. After transformation to δ-AlOOH, the conductivity will jump up around 18 GPa. If ε-FeOOH is stable above 5 GPa in an iron-rich lithology, such as banded iron formation (BIF), a high conductivity zone with positive pressure dependence could be observed to the deep lower mantle.

DOI： 10.2138/am-2021-7605

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Hydrogen diffusion mechanism in the mantle deduced from H-D interdiffusion in wadsleyite Reviewed

Wei Sun, Takashi Yoshino, Naoya Sakamoto, Hisayoshi Yurimoto

Earth and Planetary Science Letters 561 116815 - 116815 2021.5

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1016/j.epsl.2021.116815

Web of Science

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Electrical conductivity of melts: Implications for conductivity anomalies in the Earth's mantle Reviewed

Bao-Hua Zhang, Xuan Guo, Takashi Yoshino, Qun-Ke Xia

National Science Review 2021.4

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Publishing type：Research paper (scientific journal) Publisher：Oxford University Press (OUP)

<title>Abstract</title>
Magmatic liquids, including silicate and carbonate melts, are principal agents of mass and heat transfer in Earth and terrestrial planets, and they play a crucial role in various geodynamic processes and Earth's evolution. Electrical conductivity data of these melts elucidate the cause of electrical anomalies in Earth's interior and shed light on the melt structure. With the improvement on high-pressure experimental techniques and theoretical simulations, major progresses have been made on this front in the past several decades. This review aims to summarize recent advances in experimental and theoretical studies on the electrical conductivity of silicate and carbonate melts of different compositions and volatile contents under high temperature and pressure. The electrical conductivity of silicate melt depends strongly on temperature, pressure, water content, and the ratio of non-bridging oxygens to tetrahedral cations (NBO/T). By contrast, the electrical conductivity of carbonate melts exhibits a weak dependence on temperature and pressure due to their fully depolymerized structure. The electrical conductivity of carbonate melts is higher than that of silicate melts by at least two orders of magnitude. Water can increase electrical conductivity significantly and reduce the activation energy of silicate melts. Conversely, this effect is weak for carbonate melts. In addition, the replacement of alkali-earth elements (Ca2+ or Mg2+) with alkali elements causes a significant decrease in the electrical conductivity of carbonate melts. A distinct compensation trend is revealed for the electrical conductivity of silicate and carbonate melts under anhydrous and hydrous conditions. Several important applications of laboratory-based melt conductivity are introduced to understand the origin of high-conductivity anomalies in the Earth's mantle. Perspectives for future studies are also provided.

DOI： 10.1093/nsr/nwab064

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Martian core heat flux: Electrical resistivity and thermal conductivity of liquid Fe at Martian core P-T conditions Reviewed

Innocent C. Ezenwa, Takashi Yoshino

Icarus 114367 - 114367 2021.2

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Publishing type：Research paper (scientific journal) Publisher：Elsevier BV

DOI： 10.1016/j.icarus.2021.114367

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Fe–Mg interdiffusion in wadsleyite and implications for water content of the transition zone Reviewed

Baohua Zhang, Chengcheng Zhao, Takashi Yoshino

Earth and Planetary Science Letters 554 116672 - 116672 2021.1

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Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier BV

DOI： 10.1016/j.epsl.2020.116672

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Electrical resistivity of solid and liquid Pt: Insight into electrical resistivity of ε-Fe Reviewed

Innocent C. Ezenwa, Takashi Yoshino

Earth and Planetary Science Letters 544 116380 - 116380 2020.8

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DOI： 10.1016/j.epsl.2020.116380

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Pressure dependence of graphitization: implications for rapid recrystallization of carbonaceous material in a subduction zone Reviewed

Yoshihiro Nakamura, Takashi Yoshino, Madhusoodhan Satish-Kumar

Contributions to Mineralogy and Petrology 175 ( 4 ) 2020.4

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DOI： 10.1007/s00410-020-1667-2

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Measurement of the Seebeck coefficient under high pressure by dual heating Reviewed

Takashi Yoshino, Ran Wang, Hitoshi Gomi, Yoshihisa Mori

Review of Scientific Instruments 91 ( 3 ) 035115 - 035115 2020.3

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DOI： 10.1063/1.5143525

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Technique, cell assembly, and measurement of T-dependent electrical resistivity of liquid Fe devoid of contamination at P, T conditions Reviewed

Innocent C. Ezenwa, Takashi Yoshino

Review of Scientific Instruments 91 ( 2 ) 023903 - 023903 2020.2

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DOI： 10.1063/1.5112045

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Grain boundary diffusion of W in lower mantle phase with implications for isotopic heterogeneity in oceanic island basalts by core-mantle interactions Reviewed

T. Yoshino, Y. Makino, T. Suzuki, T. Hirata

Earth and Planetary Science Letters 530 115887 2020.1

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DOI： 10.1016/j.epsl.2019.115887

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Temperature-enhanced electrical conductivity anisotropy in partially molten peridotite under shear deformation Reviewed

B. Zhang, T. Yoshino

Earth and Planetary Science Letters 530 115922 2020.1

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Electrical Conductivity of Omphacite as a Function of Water Content and Implications for High Conductivity Anomalies in the Dabie-Sulu UHPM Belts and Tibet

Baohua Zhang, Chengcheng Zhao, Jianhua Ge, Takashi Yoshino

Journal of Geophysical Research: Solid Earth 124 ( 12 ) 12523 - 12536 2019.12

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DOI： 10.1029/2019JB018826

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Resistivity, Seebeck coefficient and thermal conductivity of platinum at high pressure and temperature Reviewed

H. Gomi, T. Yoshino

Physical Review B 100 214302 2019.12

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Fate of water in subducted hydrous sediments deduced from stability fields of FeOOH and AlOOH up to 20 GPa Reviewed

T. Yoshino, E. Baker, K. Duffey

Physics of the Earth and Planetary Interiors 294 106295 2019.9

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Effect of iron content on thermal conductivity of olivine with implications for cooling history of rocky planets Reviewed

Zhang Y, Yoshino T, Yoneda A, Osako M

Earth and Planetary Science Letters 519 109 - 119 2019.8

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DOI： 10.1016/j.epsl.2019.04.048

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H-D Interdiffusion in Single-Crystal Olivine: Implications for Electrical Conductivity in the Upper Mantle Reviewed

Wei Sun, Takashi Yoshino, Minami Kuroda, Naoya Sakamoto, Hisayoshi Yurimoto

Journal of Geophysical Research: Solid Earth 124 ( 6 ) 5696 - 5707 2019.6

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DOI： 10.1029/2019JB017576

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Phase transition of wadsleyite-ringwoodite in the Mg <inf>2</inf> SiO <inf>4</inf> -Fe <inf>2</inf> SiO <inf>4</inf> system Reviewed

Tsujino N, Yoshino T, Yamazaki D, Sakurai M, Sun W, Xu F, Tange Y, Higo Y

American Mineralogist 104 ( 4 ) 588 - 594 2019.4

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DOI： 10.2138/am-2019-6823

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Penetration of molten iron alloy into the lower mantle phase Reviewed

Yoshino T

Comptes Rendus - Geoscience 351 ( 2-3 ) 171 - 181 2019.2

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DOI： 10.1016/j.crte.2018.06.013

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Effect of water on the magnesite–iron interaction, with implications for the fate of carbonates in the deep mantle Reviewed

Martirosyan N.S, Shatskiy A, Chanyshev A.D, Litasov K.D, Podborodnikov I.V, Yoshino T

Lithos 326-327 435 - 445 2019.2

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The Effect of Water on Fe-Mg Interdiffusion Rates in Ringwoodite and Implications for the Electrical Conductivity in the Mantle Transition Zone Reviewed

Zhang B, Yoshino T, Zhao C

Journal of Geophysical Research: Solid Earth 124 ( 3 ) 2510 - 2524 2019.2

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High-pressure generation in the Kawai-type multianvil apparatus equipped with tungsten-carbide anvils and sintered-diamond anvils, and X-ray observation on CaSnO <inf>3</inf> and (Mg,Fe)SiO <inf>3</inf> Reviewed

Yamazaki D, Ito E, Yoshino T, Tsujino N, Yoneda A, Gomi H, Vazhakuttiyakam J, Sakurai M, Zhang Y, Higo Y, Tange Y

Comptes Rendus - Geoscience 351 ( 2-3 ) 253 - 259 2019.2

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DOI： 10.1016/j.crte.2018.07.004

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Thermal expansion of natural mantle spinel using in situ synchrotron X-ray powder diffraction Reviewed

J. Yamamoto, T. Yoshino, D. Yamazaki, Y. Higo, Y. Tange, J. Torimoto

Journal of Materials Science 54 ( 1 ) 139 - 148 2019.1

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Fluorine solubility in bridgmanite: A potential fluorine reservoir in the Earth's mantle Reviewed

Yoshino T, Jaseem V

Earth and Planetary Science Letters 504 106 - 114 2018.12

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Impurity Resistivity of fcc and hcp Fe-Based Alloys: Thermal Stratification at the Top of the Core of Super-Earths Reviewed

H. Gomi, T. Yoshino

Frontiers in Earth Sciences 6 217 2018.11

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Effects of pressure and water on electrical conductivity of carbonate melt with implications for conductivity anomaly in continental mantle lithosphere Reviewed

Takashi Yoshino, Benjamin Gruber, Clayton Reinier

Physics of the Earth and Planetary Interiors 281 8 - 16 2018.8

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DOI： 10.1016/j.pepi.2018.05.003

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The effects of ferromagnetism and interstitial hydrogen on the equation of states of hcp and dhcp FeH<inf>x</inf>: Implications for the Earth's inner core age Reviewed

Gomi H, Fei Y, Yoshino T

American Mineralogist 103 ( 8 ) 1271 - 1281 2018.8

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DOI： 10.2138/am-2018-6295

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Electrical Resistivity of Fe-C Alloy at High Pressure: Effects of Carbon as a Light Element on the Thermal Conductivity of the Earth's Core

Chengwei Zhang, Jung-Fu Lin, Ying Liu, Shaomin Feng, Changqing Jin, Mingqiang Hou, Takashi Yoshino

Journal of Geophysical Research: Solid Earth 123 ( 5 ) 3564 - 3577 2018.5

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DOI： 10.1029/2017JB015260

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Supercritical fluid in the mantle transition zone deduced from H–D interdiffusion of wadsleyite Reviewed

Wei Sun, Takashi Yoshino, Naoya Sakamoto, Hisayoshi Yurimoto

Earth and Planetary Science Letters 484 309 - 317 2018.2

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DOI： 10.1016/j.epsl.2017.12.032

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Negative activation volume of oxygen self-diffusion in forsterite Reviewed

Hongzhan Fei, Michael Wiedenbeck, Naoya Sakamoto, Hisayoshi Yurimoto, Takashi Yoshino, Daisuke Yamazaki, Tomoo Katsura

Physics of the Earth and Planetary Interiors 275 1 - 8 2018.2

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DOI： 10.1016/j.pepi.2017.12.005

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Dehydration of phengite inferred by electrical conductivity measurements: Implication for the high conductivity anomalies relevant to the subduction zones Reviewed

Sibo Chen, Xinzhuan Guo, Takashi Yoshino, Zhenmin Jin, Ping Li

Geology 46 ( 1 ) 11 - 14 2018.1

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DOI： 10.1130/G39716.1

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Electrical conductivity of the oceanic asthenosphere and its interpretation based on laboratory measurements Reviewed

Tomoo Katsura, Kiyoshi Baba, Takashi Yoshino, Tetsu Kogiso

TECTONOPHYSICS 717 162 - 181 2017.10

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DOI： 10.1016/j.tecto.2017.07.001

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Synthesis of boron-doped diamond and its application as a heating material in a multi-anvil high-pressure apparatus Reviewed

Longjian Xie, Akira Yoneda, Takashi Yoshino, Daisuke Yamazaki, Noriyoshi Tsujino, Yuji Higo, Yoshinori Tange, Tetsuo Irifune, Toru Shimei, Eiji Ito

REVIEW OF SCIENTIFIC INSTRUMENTS 88 ( 9 ) 1635 - 1641 2017.9

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DOI： 10.1063/1.4993959

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Spin transition of ferric iron in the calcium-ferrite type aluminous phase Reviewed

Ye Wu, Fei Qin, Xiang Wu, Haijun Huang, Catherine A. McCammon, Takashi Yoshino, Shuangmeng Zhai, Yuming Xiao, Vitali B. Prakapenka

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 122 ( 8 ) 5935 - 5944 2017.8

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DOI： 10.1002/2017JB014095

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Pressure dependence of transverse acoustic phonon energy in ferropericlase across the spin transition Reviewed

Hiroshi Fukui, Alfred Q. R. Baron, Daisuke Ishikawa, Hiroshi Uchiyama, Yasuo Ohishi, Taku Tsuchiya, Hisao Kobayashi, Takuya Matsuzaki, Takashi Yoshino, Tomoo Katsura

JOURNAL OF PHYSICS-CONDENSED MATTER 29 ( 24 ) 2017.6

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DOI： 10.1088/1361-648X/aa7026

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Optical signatures of low spin Fe3+ in NAL at high pressure Reviewed

Sergey S. Lobanov, Han Hsu, Jung-Fu Lin, Takashi Yoshino, Alexander F. Goncharov

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 122 ( 5 ) 3565 - 3573 2017.5

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DOI： 10.1002/2017JB014134

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Grain growth of epsilon-iron: Implications to grain size and its evolution in the Earth's inner core Reviewed

Daisuke Yamazaki, Noriyoshi Tsujino, Akira Yoneda, Eiji Ito, Takashi Yoshino, Yoshinori Tange, Yuji Higo

EARTH AND PLANETARY SCIENCE LETTERS 459 238 - 243 2017.2

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DOI： 10.1016/j.epsl.2016.11.049

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Effect of graphite on the electrical conductivity of the lithospheric mantle Reviewed

Baohua Zhang, Takashi Yoshino

GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 18 ( 1 ) 23 - 40 2017.1

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DOI： 10.1002/2016GC006530

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Pressure dependence of electrical conductivity in forsterite Reviewed

Takashi Yoshino, Baohua Zhang, Brandon Rhymer, Chengcheng Zhao, Hongzhan Fei

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 122 ( 1 ) 158 - 171 2017.1

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DOI： 10.1002/2016JB013555

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Pressure generation to 65GPa in a Kawai-type multi-anvil apparatus with tungsten carbide anvils Reviewed

Takayuki Ishii, Daisuke Yamazaki, Noriyoshi Tsujino, Fang Xu, Zhaodong Liu, Takaaki Kawazoe, Takafumi Yamamoto, Dmitry Druzhbin, Lin Wang, Yuji Higo, Yoshinori Tange, Takashi Yoshino, Tomoo Katsura

HIGH PRESSURE RESEARCH 37 ( 4 ) 507 - 515 2017

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DOI： 10.1080/08957959.2017.1375491

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An experimental kinetic study on the structural evolution of natural carbonaceous material to graphite Reviewed

Nakamura, Yosihihro, Yoshin, Takashi, Satish-Kumar, Madhusoodhan

American Mineralogist 102 ( 1-2 ) 135 - 148 2017

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DOI： 10.2138/am-2017-5733

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Phase relations of Fe3C and Fe7C3 up to 185 GPa and 5200 K: Implication for the stability of iron carbide in the Earth's core Reviewed

Jin Liu, Jung-Fu Lin, Vitali B. Prakapenka, Clemens Prescher, Takashi Yoshino

GEOPHYSICAL RESEARCH LETTERS 43 ( 24 ) 12415 - 12422 2016.12

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DOI： 10.1002/2016GL071353

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Effect of temperature, pressure and iron content on the electrical conductivity of orthopyroxene Reviewed

Baohua Zhang, Takashi Yoshino

CONTRIBUTIONS TO MINERALOGY AND PETROLOGY 171 ( 12 ) 2016.12

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DOI： 10.1007/s00410-016-1315-z

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Short-period cyclic loading system for in situ X-ray observation of anelastic properties at high pressure Reviewed

Takashi Yoshino, Daisuke Yamazaki, Yoshinori Tange, Yuji Higo

REVIEW OF SCIENTIFIC INSTRUMENTS 87 ( 10 ) 2016.10

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DOI： 10.1063/1.4963747

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The CaCO3-Fe interaction: Kinetic approach for carbonate subduction to the deep Earth's mantle Reviewed

N. S. Martirosyan, T. Yoshino, A. Shatskiy, A. D. Chanyshev, K. D. Litasov

PHYSICS OF THE EARTH AND PLANETARY INTERIORS 259 1 - 9 2016.10

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DOI： 10.1016/j.pepi.2016.08.008

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Two-stage spin transition of iron in FeAl-bearing phase D at lower mantle Reviewed

Xiang Wu, Ye Wu, Jung-Fu Lin, Jin Liu, Zhu Mao, Xinzhuan Guo, Takashi Yoshino, Catherine McCammon, Vitali B. Prakapenka, Yuming Xiao

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 121 ( 9 ) 6411 - 6420 2016.9

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DOI： 10.1002/2016JB013209

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Electrical conductivity of mantle clinopyroxene as a function of water content and its implication on electrical structure of uppermost mantle Reviewed

Chengcheng Zhao, Takashi Yoshino

EARTH AND PLANETARY SCIENCE LETTERS 447 1 - 9 2016.8

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DOI： 10.1016/j.epsl.2016.04.028

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Major element composition of an Early Enriched Reservoir: constraints from Nd-142/Nd-144 isotope systematics in the early Earth and high-pressure melting experiments of a primitive peridotite Reviewed

Nozomi Kondo, Takashi Yoshino, Kyoko N. Matsukage, Tetsu Kogiso

PROGRESS IN EARTH AND PLANETARY SCIENCE 3 ( 1 ) 2016.8

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DOI： 10.1186/s40645-016-0099-0

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Elasticity of single-crystal NAL phase at high pressure: A potential source of the seismic anisotropy in the lower mantle Reviewed

Ye Wu, Jing Yang, Xiang Wu, Maoshuang Song, Takashi Yoshino, Shuangmeng Zhai, Shan Qin, Haijun Huang, Jung-Fu Lin

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 121 ( 8 ) 5696 - 5707 2016.8

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DOI： 10.1002/2016JB013136

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Electrical conductivity model of Al-bearing bridgmanite with implications for the electrical structure of the Earth's lower mantle Reviewed

Takashi Yoshino, Seiji Kamada, Chengcheng Zhao, Eiji Ohtani, Naohisa Hirao

EARTH AND PLANETARY SCIENCE LETTERS 434 208 - 219 2016.1

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DOI： 10.1016/j.epsl.2015.11.032

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Spin transition of ferric iron in the NAL phase: Implications for the seismic heterogeneities of subducted slabs in the lower mantle Reviewed

Ye Wu, Xiang Wu, Jung-Fu Lin, Catherine A. McCammon, Yuming Xiao, Paul Chow, Vitali B. Prakapenka, Takashi Yoshino, Shuangmeng Zhai, Shan Qin

EARTH AND PLANETARY SCIENCE LETTERS 434 91 - 100 2016.1

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DOI： 10.1016/j.epsl.2015.11.011

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Graphite-boron composite heater in a Kawai-type apparatus: the inhibitory effect of boron oxide and countermeasures Reviewed

Longjian Xie, Akira Yoneda, Takashi Yoshino, Hongzhan Fei, Eiji Ito

HIGH PRESSURE RESEARCH 36 ( 2 ) 105 - 120 2016

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DOI： 10.1080/08957959.2016.1164151

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Hydrogen self-diffusivity in single crystal ringwoodite: Implications for water content and distribution in the mantle transition zone Reviewed

Wei Sun, Takashi Yoshino, Naoya Sakamoto, Hisayoshi Yurimoto

GEOPHYSICAL RESEARCH LETTERS 42 ( 16 ) 6582 - 6589 2015.8

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DOI： 10.1002/2015GL064486

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Oligomerization and carbonization of polycyclic aromatic hydrocarbons at high pressure and temperature Reviewed

Artem D. Chanyshev, Konstantin D. Litasov, Anton F. Shatskiy, Yoshihiro Furukawa, Takashi Yoshino, Eiji Ohtani

CARBON 84 ( 1 ) 225 - 235 2015.4

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DOI： 10.1016/j.carbon.2014.12.011

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Electrical conductivity of albite-(quartz)-water and albite-water-NaCl systems and its implication to the high conductivity anomalies in the continental crust Reviewed

Xinzhuan Guo, Takashi Yoshino, Akira Shimojuku

EARTH AND PLANETARY SCIENCE LETTERS 412 1 - 9 2015.2

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DOI： 10.1016/j.epsl.2014.12.021

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Electrical conductivity anisotropy in partially molten peridotite under shear deformation Reviewed

Baohua Zhang, Takashi Yoshino, Daisuke Yamazaki, Geeth Manthilake, Tomoo Katsura

EARTH AND PLANETARY SCIENCE LETTERS 405 98 - 109 2014.11

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DOI： 10.1016/j.epsl.2014.08.018

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Interconnection of ferro-periclase controls subducted slab morphology at the top of the lower mantle Reviewed

Daisuke Yamazaki, Takashi Yoshino, Tomoeki Nakakuki

EARTH AND PLANETARY SCIENCE LETTERS 403 352 - 357 2014.10

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DOI： 10.1016/j.epsl.2014.07.017

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High-pressure phase transitions in FeCr2O4 and structure analysis of new post-spinel FeCr2O4 and Fe2Cr2O5 phases with meteoritical and petrological implications Reviewed

Takayuki Ishii, Hiroshi Kojitani, Shoichi Tsukamoto, Kiyoshi Fujino, Daisuke Mori, Yoshiyuki Inaguma, Noriyoshi Tsujino, Takashi Yoshino, Daisuke Yamazaki, Yuji Higo, Kenichi Funakoshi, Masaki Akaogi

AMERICAN MINERALOGIST 99 ( 8-9 ) 1788 - 1797 2014.8

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DOI： 10.2138/am.2014.4736

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Measurement of thermal conductivity of omphacite, jadeite, and diopside up to 14 GPa and 1000 K: Implication for the role of eclogite in subduction slab Reviewed

Chao Wang, Akira Yoneda, Masahiro Osako, Eiji Ito, Takashi Yoshino, Zhenmin Jin

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 119 ( 8 ) 6277 - 6287 2014.8

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DOI： 10.1002/2014JB011208

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Growth of ringwoodite reaction rims from MgSiO3 perovskite and periclase at 22.5 GPa and 1,800 degrees C Reviewed

Akira Shimojuku, Asmaa Boujibar, Daisuke Yamazaki, Takashi Yoshino, Naotaka Tomioka, Junshan Xu

PHYSICS AND CHEMISTRY OF MINERALS 41 ( 7 ) 555 - 567 2014.7

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DOI： 10.1007/s00269-014-0669-x

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The effect of water on the electrical conductivity of olivine aggregates and its implications for the electrical structure in the upper mantle (vol 288, pg 291, 2009) Reviewed

Takashi Yoshino, Takuya Matsuzaki, Anton Shatzkiy, Tomoo Katsura

EARTH AND PLANETARY SCIENCE LETTERS 391 135 - 136 2014.4

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DOI： 10.1016/j.epsl.2014.02.016

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Electrical conductivity of brine-bearing quartzite at 1 GPa: implications for fluid content and salinity of the crust Reviewed

Akira Shimojuku, Takashi Yoshino, Daisuke Yamazaki

EARTH PLANETS AND SPACE 66 ( 1 ) 2014.4

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DOI： 10.1186/1880-5981-66-2

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Experimental determination of carbon isotope fractionation between graphite and carbonated silicate melt under upper mantle conditions Reviewed

Shogo Mizutani, M. Satish-Kumar, Takashi Yoshino

EARTH AND PLANETARY SCIENCE LETTERS 392 86 - 93 2014.4

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DOI： 10.1016/j.epsl.2014.02.006

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Mossbauer spectrum of high-pressure synthesized ilmenite-type FeGeO3 Reviewed

T. Fujii, D. Nakatsuka, M. Nakanishi, J. Takada, T. Yoshino

HYPERFINE INTERACTIONS 226 ( 1-3 ) 275 - 280 2014.4

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DOI： 10.1007/s10751-014-1014-y

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Over 1 Mbar generation in the Kawai-type multianvil apparatus and its application to compression of (Mg0.92Fe0.08)SiO3 perovskite and stishovite Reviewed

D. Yamazaki, E. Ito, T. Yoshino, N. Tsujino, A. Yoneda, X. Guo, F. Xu, Y. Higo, K. Funakoshi

PHYSICS OF THE EARTH AND PLANETARY INTERIORS 228 262 - 267 2014.3

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High pressure study of transition metal monoxides MnO and CoO: Structure and electrical resistance Reviewed

E. Ito, D. Yamazaki, T. Yoshino, S. Shan, X. Guo, N. Tsujimo, T. Kunimoto, Y. Higo, K. Funakoshi

PHYSICS OF THE EARTH AND PLANETARY INTERIORS 228 170 - 175 2014.3

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Pressure- induced enhancement of proton conduction in brucite Reviewed

Xinzhuan Guo, Takashi Yoshino

GEOPHYSICAL RESEARCH LETTERS 41 ( 3 ) 813 - 819 2014.2

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Electrical conductivity of stishovite as a function of water content Reviewed

Takashi Yoshino, Akira Shimojuku, Danyang Li

PHYSICS OF THE EARTH AND PLANETARY INTERIORS 227 48 - 54 2014.2

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Effects of pressure and temperature on the silicon diffusivity of pyrope-rich garnet Reviewed

Akira Shimojuku, Tomoaki Kubo, Takumi Kato, Takashi Yoshino, Masayuki Nishi, Tomoki Nakamura, Ryuji Okazaki, Yuki Kakazu

PHYSICS OF THE EARTH AND PLANETARY INTERIORS 226 28 - 38 2014.1

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Crossroads in Earth and Planetary Materials: H-D interdiffusion in brucite at pressures up to 15 GPa Reviewed

Xinzhuan Guo, Takashi Yoshino, Takuo Okuchi, Naotaka Tomioka

American Mineralogist 98 ( 11-12 ) 1919 - 1929 2013.11

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P-V-T relations of gamma-Ca-3(PO4)(2) tuite determined by in situ X-ray diffraction in a large-volume high-pressure apparatus Reviewed

Shuangmeng Zhai, Daisuke Yamazaki, Weihong Xue, Lijin Ye, Chaowen Xu, Shuangming Shan, Eiji Ito, Akira Yoneda, Takashi Yoshino, Xinzhuan Guo, Akira Shimojuku, Noriyoshi Tsujino, Ken-Ichi Funakoshi

AMERICAN MINERALOGIST 98 ( 10 ) 1811 - 1816 2013.10

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Electrical conductivity of dense hydrous magnesium silicates with implication for conductivity in the stagnant slab Reviewed

Xinzhuan Guo, Takashi Yoshino

EARTH AND PLANETARY SCIENCE LETTERS 369 239 - 247 2013.5

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Reply to the comment on: Carbon isotope fractionation in the Fe-C system at HPHT experiments by Reutsky and Borzdov Reviewed

Madhusoodhan Satish-Kumar, Takashi Yoshino, Hayato So, Mutsumi Kato, Yoshikuni Hiroi

EARTH AND PLANETARY SCIENCE LETTERS 368 222 - 224 2013.4

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High-pressure synthesis, crystal structure and magnetic property of ilmenite-type FeGeO3 Reviewed

Daisuke Nakatsuka, Takashi Yoshino, Jun Kano, Hideki Hashimoto, Makoto Nakanishi, Jun Takada, Tatsuo Fujii

JOURNAL OF SOLID STATE CHEMISTRY 198 520 - 524 2013.2

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High-pressure X-ray diffraction study and thermoelectric measurements of Mg2Si Reviewed

Y. Mori, Y. Kaihara, S. Nakamura, T. Yoshino, K. Takarabe

PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 10, NO 12 10 ( 12 ) 1847 - 1849 2013

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Electrical Conductivity of Mantle Minerals: Role of Water in Conductivity Anomalies Reviewed

Takashi Yoshino, Tomoo Katsura

ANNUAL REVIEW OF EARTH AND PLANETARY SCIENCES, VOL 41 41 605 - + 2013

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Erratum to: Re-evaluation of electrical conductivity of anhydrous and hydrous wadsleyite [Earth Planet. Sci. Lett. 337-338 (1) (2012) 56-67] Reviewed

Takashi Yoshino, Tomoo Katsura

Earth and Planetary Science Letters 357-358 422 2012.12

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Molecular dynamics simulation and electrical conductivity measurement of Na2O center dot 3SiO(2) melt under high pressure; relationship between its structure and properties Reviewed

Fumiya Noritake, Katsuyuki Kawamura, Takashi Yoshino, Eiichi Takahashi

JOURNAL OF NON-CRYSTALLINE SOLIDS 358 ( 23 ) 3109 - 3118 2012.12

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Re-evaluation of electrical conductivity of anhydrous and hydrous wadsleyite (vol 337, pg 56, 2012) Reviewed

Takashi Yoshino, Tomoo Katsura

EARTH AND PLANETARY SCIENCE LETTERS 357 422 - 422 2012.12

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Electrical conductivity of enstatite as a function of water content: Implications for the electrical structure in the upper mantle Reviewed

Baohua Zhang, Takashi Yoshino, Xiaoping Wu, Takuya Matsuzaki, Shuangming Shan, Tomoo Katsura

EARTH AND PLANETARY SCIENCE LETTERS 357 11 - 20 2012.12

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Electrical conductivity of magnetite-bearing serpentinite during shear deformation Reviewed

Seiya Kawano, Takashi Yoshino, Ikuo Katayama

GEOPHYSICAL RESEARCH LETTERS 39 ( 20 ) 2012.10

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P-V-T equation of state for epsilon-iron up to 80 GPa and 1900 K using the Kawai-type high pressure apparatus equipped with sintered diamond anvils Reviewed

Daisuke Yamazaki, Eiji Ito, Takashi Yoshino, Akira Yoneda, Xinzhuan Guo, Baohua Zhang, Wei Sun, Akira Shimojuku, Noriyoshi Tsujino, Takehiro Kunimoto, Yuji Higo, Ken-ichi Funakoshi

GEOPHYSICAL RESEARCH LETTERS 39 ( 20 ) 2012.10

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Effect of temperature, pressure and iron content on the electrical conductivity of olivine and its high-pressure polymorphs Reviewed

Takashi Yoshino, Akira Shimojuku, Shuanming Shan, Xinzhuan Guo, Daisuke Yamazaki, Eiji Ito, Yuji Higo, Ken-ichi Funakoshi

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 117 ( 8 ) 2012.8

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Re-evaluation of electrical conductivity of anhydrous and hydrous wadsleyite Reviewed

Takashi Yoshino, Tomoo Katsura

EARTH AND PLANETARY SCIENCE LETTERS 337 56 - 67 2012.7

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Electrical conductivity of fluid-bearing quartzite under lower crustal conditions Reviewed

Akira Shimojuku, Takashi Yoshino, Daisuke Yamazaki, Takamoto Okudaira

PHYSICS OF THE EARTH AND PLANETARY INTERIORS 198 1 - 8 2012.5

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Electrical conductivity of partial molten carbonate peridotite Reviewed

Takashi Yoshino, Elizabeth McIsaac, Mickael Laumonier, Tomoo Katsura

PHYSICS OF THE EARTH AND PLANETARY INTERIORS 194 1 - 9 2012.3

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Static compression of (Mg-0.83,Fe-0.17)O and (Mg-0.75,Fe-0.25)O ferropericlase up to 58 GPa at 300, 700, and 1100 K Reviewed

Masanori Matsui, Eiji Ito, Daisuike Yamazaki, Takashi Yoshino, Xinzhuan Guo, Shuangming Shan, Yuji Higo, Ken-Ichi Funakoshi

AMERICAN MINERALOGIST 97 ( 1 ) 176 - 183 2012.1

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Experimental determination of carbon isotope fractionation between iron carbide melt and carbon: C-12-enriched carbon in the Earth's core? Reviewed

Madhusoodhan Satish-Kumar, Hayato So, Takashi Yoshino, Mutsumi Kato, Yoshikuni Hiroi

EARTH AND PLANETARY SCIENCE LETTERS 310 ( 3-4 ) 340 - 348 2011.10

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Electrical conductivity anisotropy of deformed talc rocks and serpentinites at 3 GPa Reviewed

Xinzhuan Guo, Takashi Yoshino, Ikuo Katayama

PHYSICS OF THE EARTH AND PLANETARY INTERIORS 188 ( 1-2 ) 69 - 81 2011.9

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Unstable graphite films on grain boundaries in crustal rocks Reviewed

Takashi Yoshino, Fumiya Noritake

EARTH AND PLANETARY SCIENCE LETTERS 306 ( 3-4 ) 186 - 192 2011.6

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Effect of iron content on electrical conductivity of ferropericlase with implications for the spin transition pressure Reviewed

Takashi Yoshino, Eiji Ito, Tomoo Katsura, Daisuke Yamazaki, Shuanming Shan, Xinzhuan Guo, Masayuki Nishi, Yuji Higo, Ken-ichi Funakoshi

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 116 ( 4 ) 2011.4

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Phase boundary between perovskite and post-perovskite structures in MnGeO3 determined by in situ X-ray diffraction measurements using sintered diamond anvils Reviewed

Daisuke Yamazaki, Eiji Ito, Tomoo Katsura, Takashi Yoshino, Shuangmeng Zhai, Hiroshi Fukui, Anton Shatskiy, Xinzhuan Guo, Shuangming Shan, Takuo Okuchi, Yoshinori Tange, Yuji Higo, Ken-ichi Funakoshi

AMERICAN MINERALOGIST 96 ( 1 ) 89 - 92 2011.1

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Grain growth kinetics of majorite and stishovite in MORB Reviewed

Daisuke Yamazaki, Takuya Matsuzaki, Takashi Yoshino

PHYSICS OF THE EARTH AND PLANETARY INTERIORS 183 ( 1-2 ) 183 - 189 2010.11

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Adiabatic temperature profile in the mantle Reviewed

Tomoo Katsura, Akira Yoneda, Daisuke Yamazaki, Takashi Yoshino, Eiji Ito

PHYSICS OF THE EARTH AND PLANETARY INTERIORS 183 ( 1-2 ) 212 - 218 2010.11

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Anisotropy of synthetic quartz electrical conductivity at high pressure and temperature Reviewed

Duojun Wang, Heping Li, Li Yi, Takuya Matsuzaki, Takashi Yoshino

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 115 ( 9 ) 2010.9

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DOI： 10.1029/2009JB006695

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Electrical conductivity of basaltic and carbonatite melt-bearing peridotites at high pressures: Implications for melt distribution and melt fraction in the upper mantle Reviewed

Takashi Yoshino, Mickael Laumonier, Elizabeth McIsaac, Tomoo Katsura

EARTH AND PLANETARY SCIENCE LETTERS 295 ( 3-4 ) 593 - 602 2010.7

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DOI： 10.1016/j.epsl.2010.04.050

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Pressure generation and investigation of the post-perovskite transformation in MgGeO3 by squeezing the Kawai-cell equipped with sintered diamond anvils Reviewed

Eiji Ito, Daisuke Yamazaki, Takashi Yoshino, Hiroshi Fukui, Shuangmeng Zhai, Anton Shatzkiy, Tomoo Katsura, Yoshinori Tange, Ken-ichi Funakoshi

EARTH AND PLANETARY SCIENCE LETTERS 293 ( 1-2 ) 84 - 89 2010.4

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ELECTRICAL CONDUCTIVITY OF ENSTATITE UP TO 20 GPa AND 1600K Reviewed

Zhang Bao-Hua, Wu Xiao-Ping, Xu Jun-Shan, Tomoo Katsura, Takashi Yoshino

CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 53 ( 3 ) 760 - 764 2010.3

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DOI： 10.3969/j.issn.0001-5733.2010.03.032

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Laboratory Electrical Conductivity Measurement of Mantle Minerals Reviewed

Takashi Yoshino

SURVEYS IN GEOPHYSICS 31 ( 2 ) 163 - 206 2010.3

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Electrical conductivity measurements of periclase under high pressure and high temperature Reviewed

Xiaoping Wu, Baohua Zhang, Junshan Xu, Tomoo Katsura, Shuangmeng Zhai, Takashi Yoshino, Geeth Manthilake, Anton Shatskiy

PHYSICA B-CONDENSED MATTER 405 ( 1 ) 53 - 56 2010.1

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DOI： 10.1016/j.physb.2009.08.036

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Preliminary reports on in-situ X-ray observation of "post-perovskite" in CaRuO3 Reviewed

D. Yamazaki, E. Ito, T. Yoshino, X-G Guo, S. Shun, M. Nishi, Y. Higo, K. Funakoshi

INTERNATIONAL CONFERENCE ON HIGH PRESSURE SCIENCE AND TECHNOLOGY, JOINT AIRAPT-22 AND HPCJ-50 215 012096 2010

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DOI： 10.1088/1742-6596/215/1/012096

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High pressure generation and investigation of the spin transition of ferropericlase (Mg0.83Fe0.17)O Reviewed

E. Ito, T. Yoshino, D. Yamazaki, A. S. Shatskiy, S. Shan, X. Guo, T. Katsura, Y. Higo, K. Funakoshi

INTERNATIONAL CONFERENCE ON HIGH PRESSURE SCIENCE AND TECHNOLOGY, JOINT AIRAPT-22 AND HPCJ-50 215 012099 2010

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Electrical conductivity of mantle peridotite at the uppermost lower mantle condition Reviewed

T. Yoshino, T. Katsura, D. Yamazaki, E. Ito

INTERNATIONAL CONFERENCE ON HIGH PRESSURE SCIENCE AND TECHNOLOGY, JOINT AIRAPT-22 AND HPCJ-50 215 012102 2010

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DOI： 10.1088/1742-6596/215/1/012102

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Electrical conductivity of the major upper mantle minerals: a review Reviewed

T. Katsura, T. Yoshino, G. Manthilake, T. Matsuzaki

RUSSIAN GEOLOGY AND GEOPHYSICS 50 ( 12 ) 1139 - 1145 2009.12

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DOI： 10.1016/j.rgg.2009.11.012

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The effect of water on the electrical conductivity of olivine aggregates and its implications for the electrical structure of the upper mantle Reviewed

Takashi Yoshino, Takuya Matsuzaki, Anton Shatskiy, Tomoo Katsura

EARTH AND PLANETARY SCIENCE LETTERS 288 ( 1-2 ) 291 - 300 2009.10

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P-V-T relations of the MgSiO3 perovskite determined by in situ X-ray diffraction using a large-volume high-pressure apparatus (vol 36, L01305, 2009) Reviewed

Tomoo Katsura, Sho Yokoshi, Kazuaki Kawabe, Anton Shatskiy, M. A. Geeth, M. Manthilake, Shuangmeng Zhai, Hiroshi Fukui, H. A. Chamathni, I. Hegoda, Takashi Yoshino, Daisuke Yamazaki, Takuya Matsuzaki, Akira Yoneda, Eiji Ito, Mitsuhiro Sugita, Naotaka Tomioka, Kenji Hagiya, Akifumi Nozawa, Ken-ichi Funakoshi

GEOPHYSICAL RESEARCH LETTERS 36 ( 16 ) 2009.8

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Well-wetted olivine grain boundaries in partially molten peridotite in the asthenosphere Reviewed

Takashi Yoshino, Daisuke Yamazaki, Kenji Mibe

EARTH AND PLANETARY SCIENCE LETTERS 283 ( 1-4 ) 167 - 173 2009.6

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P-V-T relations of wadsleyite determined by in situ X-ray diffraction in a large-volume high-pressure apparatus Reviewed

Tomoo Katsura, Anton Shatskiy, M. A. Geeth M. Manthilake, Shuangmeng Zhai, Daisuke Yamazaki, Takuya Matsuzaki, Takashi Yoshino, Akira Yoneda, Eiji Ito, Mitsuhiro Sugita, Natotaka Tomioka, Akifumi Nozawa, Ken-ichi Funakoshi

GEOPHYSICAL RESEARCH LETTERS 36 ( 11 ) L11307 2009.6

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DOI： 10.1029/2009GL038107

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Effect of iron content on electrical conductivity of ringwoodite, with implications for electrical structure in the transition zone Reviewed

Takashi Yoshino, Tomoo Katsura

PHYSICS OF THE EARTH AND PLANETARY INTERIORS 174 ( 1-4 ) 3 - 9 2009.5

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DOI： 10.1016/j.pepi.2008.09.015

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Electrical conductivity of wadsleyite as a function of temperature and water content Reviewed

M. A. G. M. Manthilake, Takuya Matsuzaki, Takashi Yoshino, Shigeru Yamashita, Eiji Ito, Tomoo Katsura

PHYSICS OF THE EARTH AND PLANETARY INTERIORS 174 ( 1-4 ) 10 - 18 2009.5

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Texture of (Mg,Fe)SiO3 perovskite and ferro-periclase aggregate: Implications for rheology of the lower mantle Reviewed

Daisuke Yamazaki, Takashi Yoshino, Takuya Matsuzaki, Tomoo Katsura, Akira Yoneda

PHYSICS OF THE EARTH AND PLANETARY INTERIORS 174 ( 1-4 ) 138 - 144 2009.5

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DOI： 10.1016/j.pepi.2008.11.002

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Reply to Comments on "Electrical conductivity of wadsleyite as a function of temperature and water content" by Manthilake et al. Discussion Reviewed

Takashi Yoshino, Tomoo Katsura

PHYSICS OF THE EARTH AND PLANETARY INTERIORS 174 ( 1-4 ) 22 - 23 2009.5

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Determination of high-pressure phase equilibria of Fe2O3 using the Kawai-type apparatus equipped with sintered diamond anvils Reviewed

Eiji Ito, Hiroshi Fukui, Tomoo Katsura, Daisuke Yamazaki, Takashi Yoshino, Yoshitaka Alizawa, Atsushi Kubo, Sho Yokoshi, Kazuyoki Kawabe, Shuangmeng Zhai, Anton Shatzkiy, Maki Okube, Akifumi Nozawa, Ken-Ichi Funakoshi

AMERICAN MINERALOGIST 94 ( 2-3 ) 205 - 209 2009.2

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P-V-T relations of MgSiO3 perovskite determined by in situ X-ray diffraction using a large-volume high-pressure apparatus Reviewed

Tomoo Katsura, Sho Yokoshi, Kazuaki Kawabe, Anton Shatskiy, M. A. Geeth M. Manthilake, Shuangmeng Zhai, Hiroshi Fukui, H. A. Chamathni I. Hegoda, Takashi Yoshino, Daisuke Yamazaki, Takuya Matsuzaki, Akira Yoneda, Eiji Ito, Mitsuhiro Sugita, Naotaka Tomioka, Kenji Hagiya, Akifumi Nozawa, Ken-ichi Funakoshi

GEOPHYSICAL RESEARCH LETTERS 36 ( 1 ) L01305 2009.1

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DOI： 10.1029/2008GL035658

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The temperature-pressure-volume equation of state of platinum Reviewed

Masanori Matsui, Eiji Ito, Tomoo Katsura, Daisuke Yamazaki, Takashi Yoshino, Ayako Yokoyama, Ken-ichi Funakoshi

JOURNAL OF APPLIED PHYSICS 105 ( 1 ) 013505 2009.1

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Electrical conductivity of olivine, wadsleyite and ringwoodite Reviewed

Tomoo Katsura, Takashi Yoshino, Takuya Matsuzaki, Geeth Manthilake

Japanese Magazine of Mineralogical and Petrological Sciences 38 ( 2 ) 33 - 38 2009

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DOI： 10.2465/gkk.38.33

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Electrical conductivity of majorite garnet and its implications for electrical structure in the mantle transition zone Reviewed

Takashi Yoshino, Masayuki Nishi, Takuya Matsuzaki, Daisuke Yamazaki, Tomoo Katsura

PHYSICS OF THE EARTH AND PLANETARY INTERIORS 170 ( 3-4 ) 193 - 200 2008.11

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DOI： 10.1016/j.pepi.2008.04.009

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No interconnection of ferro-periclase in post-spinel phase inferred from conductivity measurement Reviewed

Takashi Yoshino, Daisuke Yamazaki, Eiji Ito, Tomoo Katsura

GEOPHYSICAL RESEARCH LETTERS 35 ( 22 ) L22303 2008.11

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DOI： 10.1029/2008GL035932

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Dry mantle transition zone inferred from the conductivity of wadsleyite and ringwoodite Reviewed

Takashi Yoshino, Geeth Manthilake, Takuya Matsuzaki, Tomoo Katsura

NATURE 451 ( 7176 ) 326 - 329 2008.1

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DOI： 10.1038/nature06427

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Phase boundary between ilmenite and perovskite structures in MnGeO3 determined by in situ X-ray diffraction measurements Reviewed

Daisuke Yamazaki, Eiji Ito, Yoshinori Tange, Takashi Yoshino, Shuangmeng Zhai, Hiroshi Fukui, Anton Shatskiy, Tomoo Katsura, Ken-ichi Funakoshi

PHYSICS AND CHEMISTRY OF MINERALS 34 ( 4 ) 269 - 273 2007.5

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DOI： 10.1007/s00269-007-0145-y

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Complete wetting of olivine grain boundaries by a hydrous melt near the mantle transition zone Reviewed

Takashi Yoshino, Yu Nishihara, Shun-ichiro Karato

EARTH AND PLANETARY SCIENCE LETTERS 256 ( 3-4 ) 466 - 472 2007.4

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DOI： 10.1016/j.epsl.2007.02.002

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Grain growth kinetics of CaIrO3 perovskite and post-perovskite, with implications for rheology of D '' layer Reviewed

Takashi Yoshino, Daisuke Yamazaki

EARTH AND PLANETARY SCIENCE LETTERS 255 ( 3-4 ) 485 - 493 2007.3

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DOI： 10.1016/j.epsl.2007.01.010

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Origin of seismic anisotropy in the D '' layer inferred from shear deformation experiments on post-perovskite phase Reviewed

Daisuke Yamazaki, Takashi Yoshino, Hiroaki Ohfuji, Jun-ichi Ando, Akira Yoneda

EARTH AND PLANETARY SCIENCE LETTERS 252 ( 3-4 ) 372 - 378 2006.12

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DOI： 10.1016/j.epsl.2006.10.004

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Hydrous olivine unable to account for conductivity anomaly at the top of the asthenosphere Reviewed

Takashi Yoshino, Takuya Matsuzaki, Shigeru Yamashita, Tomoo Katsura

NATURE 443 ( 7114 ) 973 - 976 2006.10

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DOI： 10.1038/nature05223

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Effect of faceting on pore geometry in texturally equilibrated rocks: implications for low permeability at low porosity Reviewed

Takashi Yoshino, Jonathan D. Price, David A. Wark, E. Bruce Watson

CONTRIBUTIONS TO MINERALOGY AND PETROLOGY 152 ( 2 ) 169 - 186 2006.8

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DOI： 10.1007/s00410-006-0099-y

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Grain boundary wetness of texturally equilibrated rocks, with implications for seismic properties of the upper mantle Reviewed

T Yoshino, Y Takei, DA Wark, EB Watson

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 110 ( B8 ) 1 - 16 2005.8

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DOI： 10.1029/2004JB003544

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Growth kinetics of FeS melt in partially molten peridotite: An analog for core-forrning processes Reviewed

T Yoshino, EB Watson

EARTH AND PLANETARY SCIENCE LETTERS 235 ( 1-2 ) 453 - 468 2005.6

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DOI： 10.1016/j.epsl.2005.04.021

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Crustal growth by magmatic accretion constrained by metamorphic P-T paths and thermal models of the Kohistan arc, NW Himalayas Reviewed

T Yoshino, T Okudaira

JOURNAL OF PETROLOGY 45 ( 11 ) 2287 - 2302 2004.11

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DOI： 10.1093/petrology/egh056

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Phase relations and equation-of-state of aluminous Mg-silicate perovskite and implications for Earth's lower mantle Reviewed

MJ Walter, A Kubo, T Yoshino, J Brodholt, KT Koga, Y Ohishi

EARTH AND PLANETARY SCIENCE LETTERS 222 ( 2 ) 501 - 516 2004.5

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DOI： 10.1016/j.epsl.2004.03.014

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Connectivity of molten Fe alloy in peridotite based on in situ electrical conductivity measurements: implications for core formation in terrestrial planets Reviewed

T Yoshino, MJ Walter, T Katsura

EARTH AND PLANETARY SCIENCE LETTERS 222 ( 2 ) 625 - 643 2004.5

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DOI： 10.1016/j.epsl.2004.03.010

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Olivine-wadsleyite transition in the system (Mg,Fe)(2)SiO4 Reviewed

T Katsura, H Yamada, O Nishikawa, MS Song, A Kubo, T Shinmei, S Yokoshi, Y Aizawa, T Yoshino, MJ Walter, E Ito, K Funakoshi

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 109 ( B2 ) 2004.2

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DOI： 10.1029/2003JB002438

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Connectivity of aqueous fluid in eclogite and its implications for fluid migration in the Earth's interior Reviewed

K Mibe, T Yoshino, S Ono, A Yasuda, T Fujii

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 108 ( B6 ) 2003.6

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DOI： 10.1029/2002JB001960

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Core formation in planetesimals triggered by permeable flow Reviewed

T Yoshino, MJ Walter, T Katsura

NATURE 422 ( 6928 ) 154 - 157 2003.3

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DOI： 10.1038/nature01459

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Aqueous fluid connectivity in pyrope aggregates: water transport into the deep mantle by a subducted oceanic crust without any hydrous minerals Reviewed

S Ono, K Mibe, T Yoshino

EARTH AND PLANETARY SCIENCE LETTERS 203 ( 3-4 ) 895 - 903 2002.11

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DOI： 10.1016/S0012-821X(02)00920-2

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Wetting properties of anorthite aggregates: Implications for fluid connectivity in continental lower crust Reviewed

T Yoshino, K Mibe, A Yasuda, T Fujii

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 107 ( B1 ) 2002.1

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DOI： 10.1029/2001JB000440

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Origin of scapolite in deep-seated metagabbros of the Kohistan Arc, NW Himalayas Reviewed

T. Yoshino, Madhusoodhan Satish-Kumar

Contributions to Mineralogy and Petrology 140 ( 5 ) 511 - 531 2001

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DOI： 10.1007/s004100000207

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Role of Water in Conductive Anomalies and Seismic Reflection in the Lower Crust

Yoshino Takashi

Bulletin of the Earthquake Research Institute, University of Tokyo 76 ( 4 ) 497 - 500 2001

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Superposition of replacements in the mafic granulites of the Jijal complex of the Kohistan arc, northern Pakistan: dehydration and rehydration within deep arc crust Reviewed

H Yamamoto, T Yoshino

LITHOS 43 ( 4 ) 219 - 234 1998.9

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DOI： 10.1016/S0024-4937(98)00014-0

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Crustal thickening of the lower crust of the Kohistan Arc (N. Pakistan) deduced from Al zoning in clinopyroxene and plagioclase Reviewed

T. Yoshino, H. Yamamoto, T. Okudaira, M. Toriumi

Journal of Metamorphic Geology 16 ( 6 ) 729 - 748 1998

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DOI： 10.1111/j.1525-1314.1998.00168.x

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Books

Preliminary results from the new deformation multi-anvil press at the Photon Factory: insight into the creep strength of calcium silicate perovskite

A.R Thomson, Y. Nishihara, D. Yamazaki, N. Tsujino, S.A. Hun, Y. Tsubokawa, K. Matsukage, T. Yoshino, T. Kubo, D.P. Dobson（ Role： Joint author）

2023.6 （ ISBN:9781119526902 ）

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高圧力の科学・技術事典

芳野極（ Role： Contributor , プレス実験;輸送特性;電気伝導度）

朝倉書店 2022.11 （ ISBN:9784254102970 ）

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鉱物・宝石の科学事典

芳野極（ Role： Contributor , 地球深部鉱物の電気伝導度）

朝倉書店 2019.9 （ ISBN:9784254162769 ）

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Total pages：xv, 645p, 図版 [16] p Language：Japanese

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Encyclopedia of Solid Earth Geophysics 2nd Edition

Takashi Yoshino（ Role： Contributor , Electrical properties of rocks）

Springer 2018.8

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図説地球科学の事典

芳野極（ Role： Contributor , 熱伝導度・電気伝導度）

朝倉書店 2018.4 （ ISBN:9784254160727 ）

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Magmas under pressure : advances in high-pressure experiments on structure and properties of melts

Takashi Yoshino（ Role： Contributor , Electrical conductivity measurement）

Elsevier 2018 （ ISBN:9780128113011 ）

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The earth's heterogeneous mantle : a geophysical, geodynamical, and geochemical perspective

Tomoo Katsura, Takashi Yoshino（ Role： Contributor , Heterogeneity of electrical conductivity in the oceanic upper mantle.）

Springer 2015 （ ISBN:9783319156262 ）

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Total pages：xv, 530 p. Language：English

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地球と宇宙の化学事典

芳野極（ Role： Contributor , コア）

朝倉書店 2012.9 （ ISBN:9784254160574 ）

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Total pages：xvi, 479p, 図版 [8] p Language：Japanese

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Encyclopedia of solid earth geophysics

Takashi Yoshino（ Role： Contributor , Electrical Properties of Rocks）

Springer 2011 （ ISBN:9789048187010 ）

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Growth and exhumation of the lower crust of the Kohistan arc, the NW Himalayas.

In Granulite Facies Metamorphism and Crustal Evolution (ed. H. Thomas) 2005

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Institute for Planetary Materials, Okayama University Introduction of “Research Center for Planetary Materials Science” Invited Reviewed

Takashi YOSHINO

The Review of High Pressure Science and Technology 34 ( 1 ) 19 - 27 2024.3

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DOI： 10.4131/jshpreview.34.19

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Research on core and mantle dynamics based on the electrical conductivity of materials of the Earth and planetary interior

Takashi YOSHINO

Japanese Magazine of Mineralogical and Petrological Sciences 53 ( 1 ) n/a - n/a 2024

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DOI： 10.2465/gkk.240109

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Studies of Deep Earth Rheology Based on High-Pressure Deformation Experiments Using D111-Type Apparatus Reviewed

30 ( 2 ) 78 - 84 2020.9

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High-Pressure and- Temperature Deformation Experiments using D111-type apparatus: Towards Understanding of Rheology of Deep Earth Materials

西原遊, 辻野典秀, 久保友明, 山崎大輔, 土居峻太, 今村公裕, 芳野極

Photon Factory News 38 ( 3 ) 2020

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Thermoelectric measurement at high-temperature up to 5 GPa

森嘉久, 石山剛史, 芳野極, WANG Ran, 五味斎

応用物理学会春季学術講演会講演予稿集(CD-ROM) 67th 2020

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Transport mechanism and distribution of melt in Earth and planetary interiors Reviewed

YOSHINO Takashi

The Review of High Pressure Science and Technology 29 ( 2 ) 94 - 102 2019.6

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高温高圧下における熱電性能測定

森嘉久, 石山剛史, 芳野極

応用物理学会秋季学術講演会講演予稿集(CD-ROM) 80th 2019

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マルチアンビルプレスを用いた熱電性能測定技術

森嘉久, 中野法大, 石山剛史, 芳野極

高圧討論会講演要旨集 60th 2019

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高温高圧下における熱電性能測定装置の開発

森嘉久, 芳野極, 財部健一

応用物理学会春季学術講演会講演予稿集(CD-ROM) 66th 2019

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熱電材料Mg₂Siにおけるパワーファクターの圧力依存性

中野法大, 森嘉久, 芳野極, 財部健一

高圧討論会講演要旨集 59th 2018

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高温高圧下での熱電測定技術の開発

中野法大, 森嘉久, 芳野極, 財部健一

高圧討論会講演要旨集 58th 2017

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デュアルヒーティングによる高圧下における熱起電力測定

芳野極, 中野法大, 森嘉久

高圧討論会講演要旨集 58th 2017

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マントル無水鉱物中の水素位置の特定に向けて

櫻井萌, 辻野典秀, 鈴木敏弘, 芳野極

高圧討論会講演要旨集 58th 2017

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Pressure dependence of structural evolution of CM: Implication for fast graphitization in subduction zone

NAKAMURA Yoshihiro, YOSHINO Takashi, SATISH-KUMAR Madhusoodhan

日本地球惑星科学連合大会予稿集(Web) 2017 2017

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Pressure dependence on carbon isotope fractionation between diamond and iron carbide melt

SATISH-KUMAR Madhusoodhan, TASAKA Miki, YOSHINO Takashi, SO Hayato

日本地球惑星科学連合大会予稿集(Web) 2016 2016

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Mg₂Siの固相反応による高圧合成

玉ノ井遥廉, 杉本直紀, 森嘉久, 芳野極

高圧討論会講演要旨集 57th 2016

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Pressure-temperature-time dependence of structural evolution of CM to graphite: Implication for fast graphitization in metamorphic terrain

NAKAMURA Yoshihiro, YOSHINO Takashi, SATISH-KUMAR Madhusoodhan

日本地球惑星科学連合大会予稿集(Web) 2016 2016

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Heterogeneity of electrical conductivity in the oceanic upper mantle

Tomoo Katsura, Takashi Yoshino

The Earth's Heterogeneous Mantle: A Geophysical, Geodynamical, and Geochemical Perspective 173 - 204 2015.1

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上部マントル無水鉱物高圧その場IR測定

櫻井萌, 辻野典秀, 舘野繁彦, 鈴木敏弘, 芳野極, 河村雄行, 高橋栄一

高圧討論会講演要旨集 56th 2015

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Seismic attenuation measurement by cyclic loading under high pressure and temperature Reviewed

Takashi Yoshino, Daisuke Yamazaki, Yuji Higo, Ken Ichi Funakoshi

Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu 24 ( 2 ) 126 - 135 2014

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DOI： 10.4131/jshpreview.24.126

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23GPaまでの高温高圧その場応力-歪同時測定技術の開発

辻野典秀, 山崎大輔, 芳野極, 米田明, 櫻井萌, 西原遊, 肥後祐司

高圧討論会講演要旨集 55th 2014

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マントル遷移層におけるペリドタイトと共存する無水鉱物の水の溶解度

芳野極, 櫻井萌, 坂本直哉, 圦本尚義

高圧討論会講演要旨集 55th 2014

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上部マントル無水鉱物圧力その場IR実験の試み

櫻井萌, 辻野典秀, 舘野繁彦, 鈴木敏弘, 芳野極, 河村雄行, 高橋栄一

高圧討論会講演要旨集 55th 2014

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Mg₂Siにおける熱電性能の合成圧力依存

貝原勇司, 谷岡正章, 玉ノ井遥廉, 森嘉久, 芳野極

高圧討論会講演要旨集 55th 2014

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Experimental studies on carbon isotope fractionatoin in the deep Earth

SATISH-KUMAR M., YOSHINO Takashi, MIZUTANI Shogo

日本鉱物科学会年会講演要旨集 2013 2013

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Quasi-hydrostatic compression of ferropericlases up to 60GPa and 1100K

MATSUI Masanori, ITO Eiji, YAMAZAKI Daisuke, YOSHINO Takashi, GUO X., SHAN S., OKAMOTO Yoshihiro, HIGO Yuji, FUNAKOSHI Ken-ichi

2011 225 - 225 2011.9

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High-pressure generation in Kawai-type multianvil apparatus equipped with sintered diamond anvils and compressibility of silicate perovskite

YAMAZAKI Daisuke, ITO Eiji, YOSHINO Takashi, SHIMOJUKU Akira, HIGO Yuji, FUNAKOSHI Ken-ichi

51 305 - 305 2010.10

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Effect of iron content on spin transition pressure of ferropericlase

YOSHINO Takashi, ITO Eiji, YAMAZAKI Daisuke, KATSURA Tomoo, SHAN Shuangming, GUO Xinxhuan, NISHI Masayuki, HIGO Yuji, FUNAKOSHI Kenichi

51 37 - 37 2010.10

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Electrical conductivity measurements of fluid-bearing rocks under high pressure and high temperature

SHIMOJUKU Akira, YOSHINO Takashi, YAMAZAKI Daisuke

51 33 - 33 2010.10

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High pressure experiments in the Fe-C system : Implications for carbon content in the core

SO Hayato, YOSHINO Takashi, SATISH-KUMAR M., KATO Mutsumi, HIROI Yoshikuni

2010 134 - 134 2010.9

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地球深部に大量に水は存在するのか？−マントル鉱物の電気伝導度から見えてきたもの

芳野極, 桂智男

科学 78 ( 12 ) 1348 - 1355 2008

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焼結ダイヤモンドアンビルを用いた川井型装置による高圧力発生

山崎大輔, 芳野極, 桂智男, 伊藤英司, 新名亨, 丹下慶範, 入船徹男, 舟越賢一

高圧討論会講演要旨集 46th 2005

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264. Deformation and metamorphism along the Northern Suture,North Pakistan

Yoshino Takashi, Masuda Toshiaki

100 483 - 483 1993.3

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Presentations

Partitioning of highly siderophile elements between metal and silicate liquids up to lower mantle pressures

Nozomi Kondo, Takashi Yoshino, Hisashi Asanuma

AGU24

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Unusual Weak Strength of Reidite Under High Pressure

Sean R Shieh, Mauritz van Zyl, Tianqi Xie, Takashi Yoshino, Masami Kanzaki, Dongzhou Zhang

AGU24

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Language：English Presentation type：Oral presentation (general)

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Phase Transition and Elasticity of (Al, H)-bearing Stishovite: Implication for the Complex Depth Distribution of the Seismic Scatterers in the Mid-lower mantle

Yingxin Yu, Youyue Zhang, Takashi Yoshino, Zhu Mao

AGU24

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Language：English Presentation type：Poster presentation

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Effect of water on seismic attenuation of the upper mantle: the origin of the sharp lithosphere–asthenosphere boundary Invited

International Workshop on Development of multianvil technology and its applications to Earth and material sciences 2021.9.22

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Event date： 2021.9.22 - 2021.9.24

Language：English Presentation type：Oral presentation (invited, special)

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Martian Core;Heat Flux;Electrical Resistivity;Thermal Conductivity of;Liquid Fe at;Martian Core;P-T Conditions

Innocent Ezenwa, Takashi Yoshino

日本地球惑星科学連合2020年大会

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Event date： 2020.7.12 - 2020.7.16

Presentation type：Poster presentation

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Is there primordial reservoir in lower mantle?

Takashi Yoshino

日本地球惑星科学連合2020年大会

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Event date： 2020.7.12 - 2020.7.16

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Seebeck coefficient measurement of olivine by dual heating system and its application to the redox kinetics of the subducted slabs

Ran Wang, Takashi Yoshino

日本地球惑星科学連合2020年大会

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Event date： 2020.7.12 - 2020.7.16

Presentation type：Poster presentation

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The effect of water on seismic attenuation of upper mantle olivine and its implications for origin of the sharp lithosphere-asthenosphere boundary

Chao Liu, Takashi Yoshino

日本地球惑星科学連合2020年大会

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Event date： 2020.7.12 - 2020.7.16

Presentation type：Poster presentation

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Iron content induced pressure- and temperature-dependency change of thermal conductivity of ferropericlase: implications for mantle dynamics

Youyue Zhang, Takashi Yoshino, Masahiro Osako

日本地球惑星科学連合2020年大会

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Event date： 2020.7.12 - 2020.7.16

Presentation type：Poster presentation

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Electrical conductivity measurement of molten iron under pressure

Innocent Ezenwa, Takashi Yoshino

The 60th High Pressure Conference of Japan 2019.10.25

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Event date： 2019.10.23 - 2019.10.25

Language：Japanese Presentation type：Poster presentation

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Shear deformation experiments on post-spinel phase

Daisuke Yamazaki, Noriyoshi Tsujino, Takashi Yoshino, Yu Nishihara

The 60th High Pressure Conference of Japan 2019.10.25

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Event date： 2019.10.23 - 2019.10.25

Language：Japanese Presentation type：Poster presentation

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High pressure synthesis of light elements and platinum group metals doped black phosphorous

Naoki Noguchi, Yuuki Fujii, Takahiro Saito, Takashi Yoshino, Chao Liu, Hidekazu Okamura

The 60th High Pressure Conference of Japan 2019.10.25

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Event date： 2019.10.23 - 2019.10.25

Language：Japanese Presentation type：Poster presentation

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Electrical resistivity and thermal conductivity of fcc Fe: Stratification of Mercury's core

Hitoshi Gomi, Takashi Yoshino

The 60th High Pressure Conference of Japan 2019.10.23

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Event date： 2019.10.23 - 2019.10.25

Language：Japanese Presentation type：Oral presentation (general)

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Thermoelectric Measurement by using Multi Anvil Press

Yoshihisa Nori, Norihiro Nakano, Tsuyoshi Ishiyama, Takashi Yoshino

The 60th High Pressure Conference of Japan 2019.10.23

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Event date： 2019.10.23 - 2019.10.25

Language：Japanese Presentation type：Oral presentation (general)

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Toward organization of a new field on fast process in Earth and planetary science Invited

Takashi Yoshino

JpGU2019 2019.5.29

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Event date： 2019.5.26 - 2019.5.30

Language：Japanese

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Seebeck coefficient of olivine: Implausible Mercury’s thermoelectric dynamo

Hitoshi Gomi, Takashi Yoshino, Akira Yoneda

JpGU2019 2019.5.29

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Event date： 2019.5.26 - 2019.5.30

Language：Japanese Presentation type：Oral presentation (general)

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Measurement of T-dependent electrical resistivity of solid and liquid Fe and Pt at fixed P

Innocent Ezenwa, Takashi Yoshino

JpGU2019 2019.5.27

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Event date： 2019.5.26 - 2019.5.30

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Electrical resistivity and thermal conductivity of fcc Fe: Implications for the Mercury’s core Invited

Hitoshi Gomi, Takashi Yoshino

JpGU2019 2019.5.27

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Event date： 2019.5.26 - 2019.5.30

Language：English Presentation type：Oral presentation (invited, special)

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Intrinsic attenuation factor Q of partially molten Fe–S–O system

Chao Liu, Takashi Yoshino

JpGU2019 2019.5.26

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Event date： 2019.5.26 - 2019.5.30

Language：English Presentation type：Poster presentation

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Fate of water in subducted hydrous sediments deduced from stability fields of FeOOH and AlOOH up to 20 GPa

Takashi Yoshino, Edward Baker, Kyle Duffey

JpGU2019 2019.5.26

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Event date： 2019.5.26 - 2019.5.30

Language：English Presentation type：Poster presentation

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Effect of iron content on thermal conductivity of olivine with implications for cooling history of rocky planets

Youyue Zhang, Takashi Yoshino, Akira Yoneda, Masahiro Osako

JpGU2019 2019.5.26

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Event date： 2019.5.26 - 2019.5.30

Language：English Presentation type：Poster presentation

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Redox kinetics of olivine revealed by diffusion profile of oxygen fugacity and its implication to the redox evolution of the uppermost mantle

Chengcheng Zhao, Takashi Yoshino

JpGU2019 2019.5.26

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Event date： 2019.5.26 - 2019.5.30

Language：English Presentation type：Oral presentation (general)

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含Al, Feブリッジマナイトの3価鉄のサイト分配

芳野極, 増野いづみ, 石井貴之

第64回高圧討論会 2023.11.3

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核―マントル境界における水と鉄の交換反応

河野克俊, 西真之, 柿澤翔, 井上徹, 桑原秀治, 芳野極, 近藤忠

第64回高圧討論会 2023.11.2

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As, Se, Te, Ptドープ黒リンの高圧合成とXAFS測定によるドーパント周辺の局所構造解析

坂本誠哉, 友村和也, 芳野極, 劉超, 岡村英一, 赤浜裕一, 野口直樹

第64回高圧討論会 2023.11.2

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Simultaneous measurements of thermal conductivity and thermal diffusivity of MgSiO3 glass under high pressure

Youyue Zhang, Takashi Yoshino, Masahiro Osako

JpGU 2023 2023.5.26

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The effect of porosity on FeS melt migration in orthopyroxene mantles in planetesimals

Kotaro Kobayashi, Hidenori Terasaki, Takashi Yoshino, Shiori Matsubara, Satoru Urakawa, Geoffrey Bromiley, Ian Butler

JpGU 2023 2023.5.26

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3D distribution of FeS melt in orthopyroxene mantle: Implication to core segregation in planetesimals

Hidenori Terasaki, Takashi Yoshino, Geoffrey Bromiley, Ian Butler, Takaumi Miura, Shiori Matsubara, Kotaro Kobayashi

JpGU 2023 2023.5.26

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Studies of the P-V-T equations of state of Fe2P and the P-T conditions of the “C22 to C23” phase transition

Youyue Zhang, Xuejing He, Takashi Yoshino

JpGU 2023 2023.5.26

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[SIT18-06] Evaluation of Fe–S melt segregation in solid core during core crystallization in planetesimals

Shiori Matsubara, Hidenori Terasaki, Takashi Yoshino, Satoru Urakawa, Kotaro Kobayashi, Geoffrey Bromiley, Ian Butler

JpGU 2023 2023.5.26

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Al2O3 and H2O incorporation in MgSiO3 Akimotoite

Kayan Lau, Takashi Yoshino

JpGU 2023 2023.5.26

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Deformation experiments on NaNiF3 perovskite and post-perovskite

Daisuke Yamazaki, Daijo Ikuta, Kayan Lau, Chao Liu, Takashi Yoshino, Noriyoshi Tsujino, Sho Kakizawa, Yuji Higo, Yu Nishihara

JpGU 2023 2023.5.26

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Electrical conductivity of iron-bearing enstatite glasses up to the lowermost mantle pressure

Izumi Mashino, Takashi Yoshino, Shinji Kitao, Takaya Mitsui, Ryo Masuda, Makoto Seto

JpGU 2023 2023.5.26

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Five-step fractional crystallisation of a late Lunar Magma Ocean implication for a primitive KREEP

Dilan Harsha Fernando Diyalanthonige, Takashi Yoshino, Robert Myhill、Richard Brooker、Amanda Lindoo

JpGU 2023 2023.5.25

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Conduction mechanisms of olivine and wadsleyite deduced from electrical conductivity and Seebeck coefficient measurements

Ran Wang, Takashi Yoshino

JpGU 2023 2023.5.25

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カルコゲン元素ドープ黒リンの高圧合成と分光学的評価

坂本誠哉, 友村和也, 芳野極, 劉超, 岡村英一, 赤浜裕一, 野口直樹

第63回高圧討論会 2022.12.15

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AlドープMg2Si熱電材料における熱電性能の圧力依存性

森嘉久, 大矢岬輝, 芳野極

第63回高圧討論会 2022.12.15

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dhcp-FeHxのレオロジー：SPring-8, BL04B1におけるD111型装置を用いた高温高圧変形その場観察実験

西原遊, 丹下義範, 肥後祐司, 辻野典秀, 柿澤翔, 國本健広, 呉文天, 高市合流, 久保田哲也, 山崎大輔, 芳野極, 川添貴章, 山口和貴, 久保友明, 坪川祐美子, 本田陸人, 後藤佑太

第63回高圧討論会 2022.12.15

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410km不連続面直上の含水メルトの電気伝導度測定

芳野極, Wang Ran

第63回高圧討論会 2022.12.14

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Electrical conductivity of hydrous silicate melt atop of the 410 km seismic discontinuity

Takashi Yoshino, Ran Wang

2022.7.11

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Simultaneous measurements of thermal conductivity and thermal diffusivity of bridgmanite and post-spinel: implications for planetary mantle dynamics and evolution

Youyue Zhang, Takashi Yoshino, Masahiro Osako

2022.5.31

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Experimental study on the timescale of core segregation in planetasimals

Hidenori Terasaki, Takumi Miura, Tadashi Kondo, Takashi Yoshino

2022.5.22

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Wetting ability of liquid Fe–S in solid core during planetesimal core crystallization

Shiori Matsubara, Hidenori Terasaki, Takashi Yoshino, Daisuke Yumitori, Satoru Urakawa

JpGU 2023 2022.5.22

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Constraint on the condition of core melt segregation in pyroxene mantle of planetary embryo

Takumi Miura, Hidenori Terasaki, Takashi Yoshino, Shiori Matsubara, Osamu Ohtaka, Tadashi Kondo

2022.5.22

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Electrical conductivity of hydrous silicate melt atop of the 410 km seismic discontinuity

Takashi Yoshino, Ran Wang

2022.5.22

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dhcp-FeHxのレオロジー：SPring-8, BL04B1におけるD111型装置を用いた高温高圧変形その場観察実験

西原遊, 丹下慶範, 肥後祐司, 辻野典秀, 山崎大輔, 芳野極, 久保友明, 坪川祐美子, 本田陸人, 後藤佑太, 國本健広, 川添貴章, 山口和貴

JpGU 2022 2022.5.22

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Al,Na ドープ黒リンの高圧合成と物性評価

友村和也, 野口直樹, 藤井優輝, 斉藤隆宏, 芳野極, 劉超, 岡村英一

第62回高圧討論会 2021.10.20

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熱電効果による沈み込んだスラブの自己的酸化還元

芳野極, Wang Ran

第62回高圧討論会 2021.10.18

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The effect of water on energy dispersion of olivine and its implications for the origin of the sharp contrast of seismic observation at the lithosphere-asthenosphere boundary

Chao Liu, Takashi Yoshino

Japan Geoscience Union Meeting 2021 2021.6.5

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Redox kinetics of the subducted slabs indicated by Seebeck coefficient measurements

Ran Wang, Takashi Yoshino

Japan Geoscience Union Meeting 2021 2021.6.4

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Self-redox of subducted slab by Seebeck effect

Takashi Yoshino, Ran Wang

Japan Geoscience Union Meeting 2021 2021.6.4

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Simultaneous measurements of thermal conductivity and thermal diffusivity of bridgmanite and post-spinel: implications of mantle dynamics and evolution

張友悦, 芳野極, 大迫正弘

Japan Geoscience Union Meeting 2021 2021.6.4

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Wetting property of Fe-S melt in solid iron: Implication to core crystallization in planetesimals

弓取大輔, 寺崎英紀, 芳野極, 浦川啓

Japan Geoscience Union Meeting 2021 2021.6.3

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Possibility of percolation of Fe-S melts in asteroidsPossibility of percolation of Fe-S melts in asteroids

三浦巧, 寺崎英紀, 近藤忠, 大高理, 芳野極

Japan Geoscience Union Meeting 2021 2021.6.3

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上部マントルの地震波減衰への水の影響

芳野極, 劉超

第61回高圧討論会 2020.12.3

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上部マントルの地震波減衰への水の影響

芳野極, Liu Chao

日本鉱物科学会2020年オンライン年会 2020.9.16

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Effects of pressure and water on electrical conductivity of carbonate melt with implications for conductivity anomaly in continental mantle lithosphere

JpGU2018 2018

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Effect of water on electrical conductivity of nominally anhydrous mantle minerals

東京大学地震研究所研究集会「太平洋アレイ」 2018

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Tungsten isotopic heterogeneity in oceanic island basalts produced by core-mantle interaction

核ーマントルの相互作用と共進化平成29年度国際シンポジウム 2018

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Impurity resistivity of fcc and hcp Fe-based alloys: Geodynamo energy balance in super-Earths

JpGU2018 2018

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Experimental study on penetration of molten iron alloy into the lower mantle phase

JpGU2018 2018

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Simultaneous measurement of thermal conductivity and diffusivity for fayalite and its γ- phase

JpGU2018 2018

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Effect of silicon on initial friction of iron

JpGU2018 2018

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Fluorine sink in Earth’s lower mantle: solubility and substitution mechanism in bridgmanite

JpGU2018 2018

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マントル無水鉱物中の水素位置の特定に向けて

高圧討論会 2017

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The band structure and impurity resistivity of hcp and fcc Fe based alloys: Implications for planetary cores

日本地球惑星科学連合2017年大会 2017

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Experimental study on chemical interaction at the core-mantle boundary

日本地球惑星科学連合2017年大会 2017

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平成28年度のダイナミクス班の成果の概要

新学術領域研究「核－マントル共進化」平成28年度成果報告会 2017

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周期振動におけるその場応力・歪観察による非弾性測定

第5回JASRIワークショップ 2017

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D111-type guide block for high-pressure deformation experiments

日本地球惑星科学連合2017年大会 2017

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Pressure dependence of structural evolution of CM: Implication for fast graphitization in subduction zone

日本地球惑星科学連合2017年大会 2017

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含水フォルステライトの高圧その場IR 測定実験

日本地球惑星科学連合2017年大会 2017

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デュアルヒーティングによる高圧下における熱起電力測定

高圧討論会 2017

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Grain boundary diffusion of W and Re in lower mantle phases

第9回高圧鉱物物理セミナー 2017

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Grain boundary diffusion of siderophile elements in lower mantle phases

第26回国際高圧力科学技術会議 2017

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The future perspective of large-volume press beam line at SPring-8 and determination of anelastic properties by in situ strain observation under cyclic loading

第26回国際高圧力科学技術会議 2017

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高温高圧下での熱電測定技術の開発

高圧討論会 2017

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線非弾性散乱による高圧下でのブリッジマナイト結晶弾性率測定2

高圧討論会 2017

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Electrical conductivity of fluid-bearing crustal rock under high pressure

日本地球惑星科学連合2011年大会 2011

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Effect of iron content in ferropericlase on spin transition pressure deduced from electrical conductivity measurement

International Union of Geodesy and Geophysics 2011

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Effects of volatile components on electrical conductivity of the deep mantle

International Union of Geodesy and Geophysics 2011

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Origin of high conductivity in the lower crust

International Union of Geodesy and Geophysics 2011

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Measurement of elastic constants of single-crystal chromian spinel by high frequency resonant

日本地球惑星科学連合2011年大会 2011

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Application of the EXAFS to the structure of the high-pressure aluminosilicate glasses

日本地球惑星科学連合2011年大会 2011

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Carbon isotope fractionation during the formation of the Earths core

日本地球惑星科学連合2011年大会 2011

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Electrical conductivity measurements of hydrous minerals under high pressure

日本地球惑星科学連合2011年大会 2011

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Laboratory-based electrical conductivity profile of the mantle transition zone

日本地球惑星科学連合2011年大会 2011

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Laboratory-based conductivity structure in the mantle transition zone

2010 AGU Fall Meeting 2010

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Electrical conductivity of carbonatite-bearing peridotite

日本地球惑星科学連合２０１０年大会 2010

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流体を含む岩石の電気伝導度

日本地球惑星科学連合２０１０年大会 2010

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Laboratory-based conductivity structure in the mantle transition zone,

European Geosciences Union General Assembly 2010

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フェロペリクレースのスピン転移圧力への鉄の量の影響

日本地球惑星科学連合2010年大会 2010

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マントルの断熱温度プロファイル

日本地球惑星科学連合2010年大会 2010

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Laboratory-based conductivity structure in the mantle

Western Pacific Geophysics Meeting 2010

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東北地方上部マントル電気伝導度構造探査の為の長周期MT観測

日本地球惑星科学連合２０１０年大会 2010

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沈み込み帯火成活動のアナロジーとしての二相流体移動の実験的研究

日本地球惑星科学連合２０１０年大会 2010

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In Situ Infiltration Experiments of Basalt- San Carlos Olivine Couple Based on the Electrical Resistance Measurements

日本地球惑星科学連合2010年大会 2010

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Electrical conductivity anisotropy of natural deformed talc rocks and serpentinite at 3 GPa

2010 AGU Fall Meeting 2010

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焼結ダイヤモンドアンビルを用いた川井型装置での圧力発生とペロフスカイトの圧縮率

第51回高圧討論会 2010

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フェロペリクレースのスピン転移圧力の鉄濃度依存性

第51回高圧討論会 2010

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高温高圧下における流体相を含む岩石中の電気伝導度測定

第51回高圧討論会 2010

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脱水に伴う含水鉱物・含水岩石の電気伝導度変化

日本地球惑星科学連合２０１０年大会 2010

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Compression of MgSiO3 and (Mg,Fe)SiO3 perovskites based on the pressure generation technique using sintered diamond anvils in a Kawai-type apparatus

2010 AGU Fall Meeting 2010

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Origin of the low velocity zone: perspectives of electrical conductivity and melt morphology (Invited)

2010 AGU Fall Meeting 2010

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Diffusion of Co, Mo and W in FeNi alloy at high pressure

2010 AGU Fall Meeting 2010

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Spin transition of Fe2+ in (Fe0.83Fe0.17)O in the multi anvil apparatus equipped with sintered diamond anvils

2010 AGU Fall Meeting 2010

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P-V-T relations of MgSiO3 perovskite determined by in situ X-ray diffraction using a large-volume high-pressure apparatus

日本地球惑星科学連合2009年大会 2009

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Electrical Conductivity of Partially Molten Peridotite Analogue Under Shear

日本地球惑星科学連合2009年大会 2009

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P-V-T relation of MgSiO3 perovskite determined by in situ X-ray diffraction using a large-volume high-pressure apparatus

The joint AIRAPT-22 & HPCJ-50 2009

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Obsevation of post-perovskite transition in germanate and melting of stishovite by using sintered diamond anvil and boron doped diamond heater in Kawai cell: Toward the generation of extreme P-V conditon

The joint AIRAPT-22 & HPCJ-50 2009

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The Post-perovskite Transformation in MgGeO3 Examined by Using the Kawai-cell Equipped with Sintered Diamond Anvils

The joint AIRAPT-22 & HPCJ-50 2009

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The effect of water on the electrical conductivity of olivine aggregates

日本地球惑星科学連合2009年大会 2009

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No interconnection of ferro-periclase in post-spinel phase inferred from conductivity measurement

The joint AIRAPT-22 & HPCJ-50 2009

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かんらん石多結晶体の電気伝導度への水の影響：上部マントルの電気伝導度構造の解釈

第49回高圧討論会 2008

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Laboratory electrical conductivity measurement of mantle minerals

IAGA WG 1.2 on Electromagnetic Induction in the Earth 2008

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マントルに大量の水は存在するのか？

2008年度日本地球化学学会 2008

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角閃岩相における斜長石の動的再結晶と結晶方位配列

日本地球惑星科学連合 2008

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高温高圧下における白金の温度ー圧力ー体積状態方程式

第49回高圧討論会 2008

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高圧地球科学における有限要素法解析の応用I：変動加熱場の履歴効果解析

第49回高圧討論会 2008

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スティショバイトの珪素自己拡散係数の測定

第49回高圧討論会 2008

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ボロン・カーボンヒーターを用いた珪酸塩鉱物の熔融実験

第49回高圧討論会 2008

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マントル鉱物の電気伝導度から推定された上部マントルの水の量

日本地球惑星科学連合大会 2008

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Electrical conductivity of transition zone minerals: wadsleyite and ringwoodite

Europe Geoscience Union 2008

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Electrical conductivity of mantle minerals

The third COE-21 International Symposium at ISEI, “Origin, Evolution and Dynamics of the Earth: a tribute to Prof. Eiji Ito” 2008

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Is there significant amount of water in the transition zone? Perspective of electrical conductivity

American Geophysical Union, Fall meeting 2008 2008

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Electrical conductivity of wadsleyite

International Union of Geodesy and Geophysics 2007

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ワズレアイトの電気伝導度

日本地球惑星科学連合2007年大会 2007

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マントル鉱物の電気伝導度

日本地球惑星科学連合2007年大会 2007

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下部マントル物質の電気伝導度

第48回高圧討論会 2007

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川井式装置による超高圧の発生とMnGeO3ポストペロフスカイト転移

第48回高圧討論会 2007

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MnGeO3ポストペロフスカイト観察

第48回高圧討論会 2007

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Evidence for dry mantle transition zone from the electrical conductivity of wadsleyite

Goldschmidt Conference 2007

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Electrical conductivity of mantle minerals

High Pressure Mineral Physics Seminar 7 2007

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Electrical conductivity of hydrous systems

High Pressure Mineral Physics Seminar 7 2007

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High pressure and high temperature experimentsusing sintered diamond anvils

High Pressure Mineral Physics Seminar 7 2007

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Awards

JAPAN ASSOCIATION OF MINERALOGICAL SCIENCES AWARD

2023.9 Japan Association of Mineralogical Sciences

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MSA fellow

2020.11 Mineralogical Society of America

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2018 JSPS PD Examination Committee (in charge of writing) Award

2019.7 JSPS

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Research Projects

Precise determination of phase relations of hydrous peridotite up to lower mantle conditions and clarification of water distribution in the mantle

Grant number：24K00735 2024.04 - 2028.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

石井貴之, 芳野極, 大谷栄治, 山崎大輔

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Grant amount：\18590000 （ Direct expense: \14300000 、 Indirect expense：\4290000 ）

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最下部マントル物質の粘性率の決定

Grant number：22H00180 2022.04 - 2027.03

日本学術振興会科学研究費助成事業基盤研究(A) 基盤研究(A)

山崎大輔, 辻野典秀, 芳野極, 坂本直哉

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Grant amount：\43420000 （ Direct expense: \33400000 、 Indirect expense：\10020000 ）

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Experimental study on deep mantle by Kawai-type multianvil press

Grant number：21H04996 2021.07 - 2026.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S)

芳野極, 桑原秀治, 増野いづみ, 山崎大輔, 石井貴之, 辻野典秀

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Grant amount：\193570000 （ Direct expense: \148900000 、 Indirect expense：\44670000 ）

大容量川井型マルチアンビル装置（KMA）の最近の技術革新により、今まで困難であった圧力、温度での高圧実験を展開できるようになったことを背景に、KMAの特性を最大限に活かすことでマントルの未解決の諸問題に様々な角度から取り組む研究課題である。マントルの強親鉄元素の高濃度異常の原因として提唱されているレイトベニア仮説論争の検証、下部マントルに存在するとされる始原的リザーバーの起源を解明するために、超高圧下における分配実験、変形実験、熱電測定といった新しい視点の実験から制約する。これらの結果を整合的に説明できる統合的なマントル進化モデルを創出することが本研究の目的となる。
本年度は、本研究の多角的アプローチのうち以下の３つの研究において成果を得ることができた。１）レイトベニア仮説を検証するために高圧下での溶融鉄とケイ酸塩メルト間の強親鉄元素の分配実験を圧力25GPaで行い、回収試料の分析を東京大学平田研究室のレーザーアブレーションICP-MSで行った。先行研究における川井型マルチアンビル装置での最高圧力実験である18GPaの圧力の結果と異なり、強親鉄元素はケイ酸塩メルトにより分配される結果が得られた。２）始原的リザーバーの存在がBEAMSモデルで説明できるかを検証するための試験的に低歪量の高圧変形実験を行った。ブリッジマナイトとポストスピネルを直列に接した一軸圧縮実験を行ったところ、両者に違いは見られなかった。また、ブリッジマナイト単相の構成則を決定し、ブリッジマナイトがマントル主要鉱物で最も硬いことを明らかにした。３）下部マントルと核の間の熱交換を制約するため、パルス加熱法による熱伝導度測定でブリッジマナイトの熱伝導度の組成依存性を決定したところ、今までの研究に比較して、AlやFeといった主要な不純物は大きく熱伝導度を下げることが確認された。

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Fe isotope fractionation by Seebeck effect at the core-mantle boundary

Grant number：21K18657 2021.07 - 2023.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Exploratory)

芳野極

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Grant amount：\6370000 （ Direct expense: \4900000 、 Indirect expense：\1470000 ）

鉄は太陽系の非揮発性元素の中でも最も豊富な元素の１つで、惑星の形成と分化過程において重要な役割を果たしている。地球のマントルの鉄同位体(δ57Fe)は、コンドライトと同等のδ57Feを持つ火星、小惑星ベスタに対して約0.1‰高いが、高温高圧でのケイ酸塩メルトの実験はコアとマントルの分離時にこのような分別が起きる可能性を否定している。本研究では、CMB上部に位置するマントル最下部は地球内部最大の熱境界層であることから、大きな温度差による熱電（ゼーベック）効果により、CMBで酸化還元反応が起こり、マントル物質の鉄同位体分別が引き起こされたという仮説を検証する研究である。本年度は大容量マルチアンビルプレスを用いた高圧実験を行った。ケイ酸塩試料の片側を鉄合金としてその反対側に白金の電極を配置して、温度差によって生じる熱起電力を模して直流電場を与えた。実験はまず複雑な高圧セルを試すために地球より鉄同位体比が高い月を対象として５GPa程度の圧力で電位差や温度を変数として実験を行なった。オリビン中には白金の酸素雰囲気センサーを入れることで、電位差をかけた試料を横切る酸素雰囲気のプロファイルを検出した。予想通り、試料の電極付近では酸化還元反応が生じており、陽極では酸化的、陰極では還元的となり、試料を横切って連続的な酸化還元プロファイルを持つことがわかった。オリビンのゼーベック係数の測定は２系統独立加熱法を用いて試料の両端の温度差を制御しながら実施した。鉄を含むオリビンのゼーベック係数は低温では電子ホールのホッピングによって正の値を示すが、1100℃以上では金属サイトの空孔の移動が主体となり負の値を示した。このことは、ゼーベック効果によってCMBで起こる反応は還元反応ということになる。本試料を用いて次年度は鉄同位体分析を行う。

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A study of electrical conductivity of molten rock

Grant number：20K04129 2020.04 - 2023.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C) Grant-in-Aid for Scientific Research (C)

藤田清士, 佐久間博, 芳野極, 市來雅啓

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Grant amount：\3900000 （ Direct expense: \3000000 、 Indirect expense：\900000 ）

本研究では、室内実験により、任意の温度圧力条件下で含水鉱物・含水岩石を溶融させることにより、その物理条件下における状態を電気伝導度変化として捉えることを試みる。室内実験の結果を、理論計算から推算された電気伝導度と比較を行い、MT法のような電磁気観測から得られた電気伝導度構造解析結果などと直接対比することにより、データの相互検証が可能になる。火山体下やプレート発生領域の溶融温度近傍を電気伝導度の視点から捉えることが本研究の特徴である。
2021年度は、玄武岩質岩石を高温高圧下で、電気伝導度測定する事に注力した。実験では、溶融状態を想定して電気伝導度測定を行った。試料は、玄武岩の主要組成を合成をした物と富士山麓から採取した玄武岩のシュミラントを使用した。実験結果からは試料の温度依存性と圧力依存性を確認することができた。
理論的な電気伝導度推算のために、ニューラルネットワーク解析を利用した。本年度は既存のプログラムを他の言語に移植し、推算の精度を向上させた。その結果、酸化鉄や酸化チタンなどの物質が岩石全体の電気伝導度に与える影響を定量的に評価できる成果を得た。
本研究では、導電性鉱物の挙動解明やネットワークの連結など電気伝導メカニズムを精査する。研究では、実験値と理論計算を相互に検証する計画であるため、従来の“手探り”の実験から大幅に進化した研究を行うことができる。2021年度から2022年度にかけては、様々な電気伝導度測定実験をおこない、計算機シミュレーションから電気伝導度の推算を推進する。

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「核－マントルの相互作用と共進化」の推進と支援

Grant number：20H05611 2020.04 - 2021.03

日本学術振興会科学研究費助成事業新学術領域研究(研究領域提案型) 新学術領域研究(研究領域提案型)

土屋卓久, 芳野極, 鈴木昭夫, 入舩徹男, 鈴木勝彦, M Satish‐Kumar, 田中聡, 田中宏幸, 鍵裕之

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Grant amount：\3900000 （ Direct expense: \3000000 、 Indirect expense：\900000 ）

計画研究ごとの総括、複数計画研究の共同研究から得られた成果とりまとめ、全体の考察を通して、領域の研究成果を取りまとめた。具体的には、マントル深部及び核の熱特性、始原物質の貯蔵機構、熱源元素総量などを軸として個々の成果について集約し、領域全体としての活動を総括し成果取りまとめを実行した。前年度までと同様に地球惑星科学連合(JpGU)年次大会において国際セッションを主催し、本領域で得られた核－マントルの相互作用と共進化に関する研究成果を世界の研究者と共有するとともに、本領域の活動により得られた新たな知見を集約した書籍や論文特集号の編集及び執筆を行った。それらを通し、最終的には「核－マントルの相互作用と共進化」について領域として新たなモデルを提案し、新たな学理として統合的地球深部科学の確立を試みた。成果取りまとめを計画的に進めるために、5月、8月、10月に集中的に総括班メンバーによるメール会議を行った。その他、社会・国民に向けた研究成果情報の発信も精力的に実施した。具体的には、一般に向けて研究教育成果を分かりやすくまとめた成果報告書を編集するとともに、ホームページ及びSNSを活用して成果の周知及び情報発信を行った。これらに加え、成果取りまとめの一環として、本領域の活動により得られた新たな知見を集約した英文書籍の編集及び執筆を行った（英文書籍については米国地球物理学連合からの出版を現在進めている）。これらを通じ、本研究プロジェクトの成果を一般のレベルから専門家のレベルまで国内外を問わず幅広い対象に向けて発信した。これら領域の活動について事後評価を受け、「A」の評価を得た。一方、本年度に実施を予定していた研究成果発表会については、新型コロナウイルス感染症の蔓延により延期せざるを得ない状況となった。

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X線非弾性散乱法による下部マントル条件での含鉄ブリッジマナイトの結晶弾性定数測定

Grant number：19H02004 2019.04 - 2023.03

日本学術振興会科学研究費助成事業基盤研究(B) 基盤研究(B)

福井宏之, 米田明, 芳野極, 鎌田誠司, 中塚晃彦

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Grant amount：\17160000 （ Direct expense: \13200000 、 Indirect expense：\3960000 ）

鉄やアルミニウムに富む中央海嶺玄武岩組成の出発物質からブリッジマナイト単結晶を高圧下で合成し、その評価を電子プローブμアナライザ、単結晶X線回折、放射光メスバウア分光により実施した。この結果、海洋地殻起源のブリッジマナイトでは、電荷カップル置換により結晶中のMg,SiがFe,Alに置き換わっていることを明らかにした。この内容は論文に纏められ、2021年11月に研究分担者が主著者としてScientific Reports誌に掲載された。研究代表者も本論文の著者に含まれている。この評価された単結晶と同時に合成された単結晶を集束イオンビームにより切り出し、ダイヤモンドアンビルセルに封入した。これについてのX線非弾性散乱実験は現在進行中である。
これとは別に、bcc構造を持つタンタル単結晶に対し、54万気圧までの条件でX線非弾性散乱測定を実施した。fcc構造を持つ金属単結晶に比べて、bcc構造は非静水圧下でも単結晶の結晶性が悪化しにくいため、54万気圧でも良好な測定が可能であった。この結果に基づき、タンタルを用いた絶対圧力スケールを構築した。このスケールは、近年報告されたルビースケール（Ruby2020）とも測定圧力までの範囲で調和的であった。本研究では測定していないが、タンタルは100万気圧付近でコーン異常による軟化が報告されているが、約80万気圧まで先行研究による状態方程式と矛盾はなかった。またこの内容はすでに論文に纏めて現在投稿中である。

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Constraints of hydrogen positions in nominally anhydrous mantle minerals and implication for their rheological properties

Grant number：18H01314 2018.04 - 2022.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

TSUJINO Noriyoshi

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Grant amount：\17290000 （ Direct expense: \13300000 、 Indirect expense：\3990000 ）

Water can incorporate into nominally anhydrous mantle minerals and is considered to affect rheological properties of mantle minerals. However, mechanism, by which water affects rehology, was unknown. In this study, in-situ IR measurements were performed to identify hydrogen positions in mantle minerals in order to understand the mechanisms of effect of water. In addition, rheological measurements of mantle minerals were performed under dry conditions, which is the basis for understanding the effects of water on rheology.

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Investigation on viscosity anomaly at ~1000 km depth and constraints on the chemistry in the lower mantle

Grant number：17H01173 2017.04 - 2021.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

Yamazaki Daisuke

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Grant amount：\44590000 （ Direct expense: \34300000 、 Indirect expense：\10290000 ）

Geophysical observation revealed that the viscosity increases by an order of magnitude at a depth of ~ 1000 km in the earth’s lower mantle. At a same depth of ~1000 km, the stagnation of the subducted slabs are observed in several subduction zones. To constrain the mechanism of the viscosity jump, the viscosity properties of the constituent minerals of the lower mantle were investigated by using an improved and newly installed high-pressure deformation apparatus for a mineral physics approach. As a result, it is likely that the contribution of ferropericrace, which is the secondary phase of lower mantle assembly, for the viscosity change is low, and the viscosity of bridgmanite itself is the key factor.

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Effect of small amount of water on physical properties of mantle materials with implications for softening of asthenosphere

Grant number：17H01155 2017.04 - 2021.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A) Grant-in-Aid for Scientific Research (A)

Yoshino Takashi

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Grant amount：\45500000 （ Direct expense: \35000000 、 Indirect expense：\10500000 ）

Accurate detection of trace amounts of water in the mantle is the key to understanding mantle evolution and dynamics, as the presence of trace amounts of water in the mantle significantly reduces the viscosity and solidus temperature of rocks. In this study, the effects of trace amounts of water incorporated into olivine, which is the main mineral of the upper mantle, on the physical characteristics of the upper mantle were determined as functions of the elastic constant, attenuation factor (Q value), and electrical conductivity as a function of water content. It was found that the lack of frequency dependence attenuation observed under the old oceanic floor at the lithosphere-asthenosphere boundary can be explained by the presence of a trace amount of water of about 200 ppm by weight only in the asthenosphere.

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Support for the international activities of Core-Mantle Interaction and Coevolution

Grant number：15K21712 2015.11 - 2020.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Tsuchiya Taku

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Grant amount：\74750000 （ Direct expense: \57500000 、 Indirect expense：\17250000 ）

This study supported international activities of an large-scale interdisciplinary research project "Core-Mantle Interaction and Coevolution". This project focused on the physical and chemical interactions between Earth's core and mantle, where scientists from mineral physics, geochemistry, solid geophysics, and particle physics have collaborated together. In total 460 international collaborations were conducted in this project, and this study supported in total 95 international coauthored papers, which were published in several high-impact journals including Nature Geoscience, Nature Communications, and Nature Chemistry. This study also strongly promoted a construction of an international collaboration platform and training of young researchers by organizing international symposiums and schools. The research outcomes were disseminated to the public actively through outreach activities including web sites, press releases, activity reports, public lectures, and SNS.

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Dynamic behaviour of core and mantle materials

Grant number：15H05827 2015.06 - 2020.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area) Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Yoshino Takashi

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Grant amount：\152360000 （ Direct expense: \117200000 、 Indirect expense：\35160000 ）

From the viewpoint of heat and mass transport processes, we have promoted research on physical property measurement of deep earth materials. From the thermal conductivity measurement, only the temperature inhomogeneity inside the mantle due to mantle convection is the cause of regional difference of heat flow in CMB. Nuclear mantle interactions can produce negative anomalies in the W isotope ratio of oceanic island basalts. From the high-pressure deformation experiment, the lower mantle is about an order of magnitude stronger than the mantle transition layer. The deformation of the subducted slab is mainly due to the diffusion creep due to the phase transition and subsequent grain refinement, except for the marginal part of the retained slab where the selective orientation due to dislocation creep has developed. The anisotropy observed in the D "layer is formed by the selective orientation due to particle rotation, and the viscosity of the plume is higher than that of the slab.

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Support of Core-Mantle Interaction and Co-evolution

Grant number：15H05826 2015.06 - 2020.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area) Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

TSUCHIYA Taku

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Grant amount：\67470000 （ Direct expense: \51900000 、 Indirect expense：\15570000 ）

This study controlled an interdisciplinary research project on the physical and chemical interactions between Earth's core and mantle, where scientists from mineral physics, geochemistry, solid geophysics, and particle physics have collaborated together. Many remarkable outputs including elucidations of the average lower mantle composition, the energy transport from the core to the mantle, the amount of heat source in the mantle, and a discovery of a new dense hydrous mineral stable down to the core-mantle boundary pressure, and a location estimation of primordial chemical reservoirs have been obtained and published in high-impact international journals including Nature. In this project, international symposiums and schools were organized to promote international collaborations and to train young researchers powerfully. The research outcomes were also disseminated to the public actively through outreach including web sites, press releases, activity reports, public lectures, and SNS.

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Crystal elasticity of mantle mineral towards understanding seismic anistropy

Grant number：15H02128 2015.04 - 2020.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A) Grant-in-Aid for Scientific Research (A)

Yoneda Akira

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Grant amount：\42640000 （ Direct expense: \32800000 、 Indirect expense：\9840000 ）

On inelastic X-ray scattering experiment (IXS), we published the measurement results of Au and Pt in international papers. These were constituted only using the bulk modulus obtained by IXS and the X ray lattice constant data measured at the same time; thus they are recognized as the primary pressure scale. After that, we succeeded in measuring the single crystal elasticity of NaCl up to 20 GPa and Ta up to ~33 GPa.
On the other hand, on the GHz sound velocity method, it took long time to acquire the signal from the DAC sample. However by introducing ammonia coating, metal coupler, devising new DAC support, and developing S-wave buffer rod, the simultaneous P-wave and S-wave of the iron sample was finally obtained at 2 GPa.

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A study of electirical properties and natural remanent magnetization of rhyolite

Grant number：15K05342 2015.04 - 2018.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C) Grant-in-Aid for Scientific Research (C)

FUJI-TA Kiyoshi

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Grant amount：\4290000 （ Direct expense: \3300000 、 Indirect expense：\990000 ）

Natural volcanic rock contains various minerals and its conduction mechanism is complex. To comprehend the relationship between chemical components and electrical conductivity, we measured electrical conductivity of synthesized rhyolitic glass under high P-T conditions. Observed electrical conductivity change corresponds to glass transition (Tg) zone. As glass transition temperature is crucial to understand the upwelling mechanism of volcanic rock, we carefully observed the electrical conductivity changes of rhyolitic glass. We also observed the natural remanent magnetization direction of a thick rhyolite lava and investigated whether the rhyolite has the ability to record the expected remanent magnetization direction. Rhyolite lava showing significant deviation from the expected direction of the Earth's geomagnetic field was observed in part, while rhyolite lava samples mostly show similarity in the direction with the expected one.

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Effect of light element on rheology of hcp-iron: Structure and dynamics of the inner core

Grant number：26287136 2014.04 - 2017.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B) Grant-in-Aid for Scientific Research (B)

Yamazaki Daisuke

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Grant amount：\17030000 （ Direct expense: \13100000 、 Indirect expense：\3930000 ）

We determined the grain growth and diffusion rates of hcp iron and estimated the dominant deformation mechanism and viscosity of the inner core based on the experimental results. As a result, chemical heterogeneity is essential to interpret the observed heterogeneity between the eastern and western sides of the inner core in seismic attenuation. Moreover, we experimentally showed the small effect of Si on viscosity of hcp iron, indicating that light element(s) rather than Si may significantly affect the viscosity of the inner core.

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Revealing the process of melt generation and hidden reservoir formation in the Hadean Earth

Grant number：26400514 2014.04 - 2017.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C) Grant-in-Aid for Scientific Research (C)

KOGISO Tetsu, KONDO Nozomi, YOSHINO Takashi, MATSUKAGE Kyoko

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Grant amount：\4680000 （ Direct expense: \3600000 、 Indirect expense：\1080000 ）

The present Earth has a higher 142Nd/144Nd ratio than most chondrites. Thus, if the Earth is assumed to have formed from chondrite, a complement low-142Nd/144Nd reservoir (hidden reservoir) is needed. We estimated the age and conditions to form the hidden reservoir based on Sm-Nd partitioning and melting phase relations. Our estimate indicates that the hidden reservoir should have formed within ~30 Myr from the Earth formation and at 7 GPa, 1750°C. We then performed high pressure melting experiments on primitive peridotite to determine the major element composition of a melt that can be the hidden reservoir at this condition, and calculated its density. The results indicate that the melt is iron- and titanium-rich komatiite. The estimated density of the melt is lower than that of the primitive peridotite, suggesting that the melt would have ascended in the mantle to form crust in the Hadean and have been ejected from the Earth by the giant impact.

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Mapping water in the mantle: Constraints from seismic attenuation and electrical conductivity under high pressure and temperature

Grant number：24244087 2012.04 - 2016.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A) Grant-in-Aid for Scientific Research (A)

Yoshino Takashi, YONEDA Akira, NISHIHARA Yu, YAMAZAKI Daisuke

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Grant amount：\46020000 （ Direct expense: \35400000 、 Indirect expense：\10620000 ）

To determine the amount and distribution of water in the mantle, we have tried to determine Q value characterizing the seismic attenuation and the electric conductivity as a function of the water content. The development and installation of the short-period oscillation hydraulic system was carried out to determine the Q value of the water-bearing materials under high temperature and high pressure by in situ X-ray radiography observation. In order to determine electrical conductivity of olivine, wadsleyite and ringwoodite as a function of water, H-D inter-diffusion experiments were conducted using the synthesized single crystal pair. These results enable us to estimate the electrical conductivity at relatively high temperatures. Based on the comparison with the geophysical data, the average amount of water in mantle transition zone is found to be 0.1 wt.%, and there is a wide lateral variation. Hydrous olivine cannot account for the high conductivity anomaly in the asthesnosphere.

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A study of electirical properties of rock associated with dehydrationn and melt

Grant number：24540512 2012.04 - 2015.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C) Grant-in-Aid for Scientific Research (C)

FUJITA Kiyoshi, YOSHINO Takashi, WADA Yutaka, ICHIKI Masahiro

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Grant amount：\4550000 （ Direct expense: \3500000 、 Indirect expense：\1050000 ）

The purpose of our study is to provide an explanation for experimental results on electrical conductivity variations for rhyolite melt. To detect melt processes using electrical conductivity, we carried out conductivity measurements on synthesized rhyolite. We also developed a cell-type lattice model to clarify the inter-connected conductivity mechanism of rock melt. We quantified electrical conduction networks in rock and evaluated electrical conductivity models of melt.

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Hydrogen in earth and planetary materials observed by high-pressure diamond anvil cell NMR

Grant number：23340161 2011.04 - 2015.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B) Grant-in-Aid for Scientific Research (B)

OKUCHI Takuo, YOSHINO Takashi, SASAKI Shigeo, YAMASHITA Shigeru

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Grant amount：\18200000 （ Direct expense: \14000000 、 Indirect expense：\4200000 ）

Chemcial bonding state and microscopic dynamics of hydrogen in minerals, ices and gas hydrates at high pressure are important problems in earth and planetary material sciences. Diamond anvil cell nuclear magnetic resonance spectroscopy is an unique probe to determine microscopic structure and dynamics of hydrogenous materials confined at high pressures. Here we successfully applied this technique to observe hydrogen's dynamics in hydrogen hydrate and in fluid hydogen in situ at high pressures to 5 GPa. In addition to this achievement, we have also determined hydrogen diffusion coefficients in brucite at high pressure and temperature conditions. We also newly developed a technique to observe neutron diffraction of methane hydrate at a few gigapascals of pressures.

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Experimental determination of carbon isotope fractionation in theFe-C system under HPHT conditions.

Grant number：23654186 2011 - 2012

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research Grant-in-Aid for Challenging Exploratory Research

エムサティッシュ-クマール, YOSHINO Takashi

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Grant amount：\3640000 （ Direct expense: \2800000 、 Indirect expense：\840000 ）

Equilibrium carbon isotope fractionation between graphite/diamond and iron carbide melt at 5 and 10 GPa and in the temperature range between 1200 and 2000 oC was determined. The results suggest that iron carbide melt will preferentially accumulate12^C rather than 13^C. We proposed that the temperature-dependent fractionation of carbon isotopes between iron carbide melt and graphite/diamond might have created a “12^C-enriched core” with a significant difference in the distribution of carbon isotopes between the carbon in the metallic core and bulk silicate Earth during the accretion and differentiation of early Earth.

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Experimental study on physical properties of minerals at the lowermost mantle conditions by means of Kawai-type apparatus

Grant number：22224008 2010.04 - 2015.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S) Grant-in-Aid for Scientific Research (S)

YONEDA Akira, ITO Eiji, YAMAZAKI Daisuke, YOSHINO Takashi, TOMIOKA Naotaka, TSUJINO Noriyoshi, OSAKO Masahiro

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Grant amount：\201760000 （ Direct expense: \155200000 、 Indirect expense：\46560000 ）

The HGP at ISEI reproduced core mantle boundary (CMB) condition in the SD-KMA for experiments. The SD-KMA is superior to DACs for quantitative studies because of its much larger (~1,000 ×) cell volume. Some studies, such as grain growth, diffusion, and phase relationships, can only be conducted reliably and with reproducibility in the SD-KMA. Another imporatant contribution is to measure thermal conductivity of pyroxenes under high temperature and high pressures.The other aspect of this project is the study of the elasticity of MgSiO3 perovskite and Post-perovskite.

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Observational and experimental study on water contentin the Earth's mantle

Grant number：22340124 2010 - 2012

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B) Grant-in-Aid for Scientific Research (B)

TOH Hiroaki, HAMANO Yozo, YOSHINO Takashi

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Grant amount：\11310000 （ Direct expense: \8700000 、 Indirect expense：\2610000 ）

Water in the Earth’s mantle as a trace element significantly modifies physical properties of our mantle as well as its convection mode. In this study, we focused on the mantle transition zone, which has been revealed to have high potential for water storage, and aimed at delineating its water content by both seafloor electromagnetic (EM) observation and high-pressure/temperature experiments. The laboratory experiments showed that a small amount of water (<0.1 wt%) cannot have a significant impact on electrical conductivity of the mantle minerals in the transition zone, while the seafloor EM observation revealed a relatively dry (up to a few permil) transition zone beneath the Northwest Pacific Basin.

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Electromagnetic Imaging of Geofluid

Grant number：21109003 2009.07 - 2014.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area) Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

OGAWA Yasuo, FUJITA Kiyoshi, KANDA Wataru, MATSUSHIMA Masaki, YOSHINO Takashi, TOH Hiroaki, UYESHIMA Makoto, ICHIKI Masahiro, KOYAMA Takao

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Grant amount：\168220000 （ Direct expense: \129400000 、 Indirect expense：\38820000 ）

From the detailed magnetotelluric observations around the Naruko volcano in the central NE Japan arc, we analyzed three-dimensional resistivity structure of the crust and the upper mantle. We found sub-vertical conductors beneath active volcanoes, Naruko and Onikobe, which imply existence of saline fluid reservoir. In the upper mantle, we imaged a conductor on top of the down-going plate. The conductor extends towards the Moho under the backbone ranges. We also found that it also has a branch toward west beneath volcanoes along the Japan Sea. From the experimental resistivity measurements of a fluid bearing rocks under lower crustal conditions, we found that those crustal conductors, found by magnetotelluric measurements, need high salinity fluids.

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Rheology of post-perovskite and the lowermost lower mantle inferred from high pressure experiments

Grant number：21340128 2009 - 2011

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B) Grant-in-Aid for Scientific Research (B)

YAMAZAKI Daisuke, ITO Eiji, YOSHINO Takashi, KATSURA Tomoo

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Grant amount：\18590000 （ Direct expense: \14300000 、 Indirect expense：\4290000 ）

Post-perovskite is considered to be the dominant phase in the lowermost lower mantle(D "layer). Therefore, we investigated rheology of post-perovskite associated with the phase transformation from perovskite to post-perovskite by means of high pressure experiments to understand the dynamics of the earth's interior. Grain size is a key parameter which controls the mechanism of deformation and viscosity of constituting materials. Based on present experimental results, significant grain size reduction occurs during phase transformation and hence viscosity reduction is expected in the Dlayer.

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巨大単結晶と大容量超高圧発生技術に基くマントル深部のレオロジー

Grant number：20224010 2008 - 2012

日本学術振興会科学研究費助成事業基盤研究(S) 基盤研究(S)

桂智男, 米田明, 山崎大輔, 芳野極, 安東淳一, 伊藤英司, 富岡尚敬

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Grant amount：\198900000 （ Direct expense: \153000000 、 Indirect expense：\45900000 ）

1. 本年度、設備備品として、精密イオンポリッシングシステム(PIPS691)・PIPSコールドステージ・GATAN636試料冷却2軸傾斜ホルダ・試料ホルダ予備排気装置・GATANデジタルマイクログラフソフトウェァを購入し、セットアップを行った。
2. 単結晶フォルステライトの珪素自己拡散係数を圧力3～13GPa、温度1600Kと1800Kで測定じた。単結晶試料の化学組成は、電子線マイクロープローブで調べた限り不純物は検出されない純粋なMg2Si04である。拡散の方向は[100]および[001]である。超高圧高温拡散実験は川井型マルチアンビル装置で行い、拡散プロファイル測定は二次イオン質量分析計で行った。得られた拡散係数は、1600Kでは10^<-20>～10^<-21>m^2s^<-1>、1800Kでは10^<-19>m^2s^<-1>であった。これにより、活性化エネルギーは430kJ/mol、活性化体積は1.3x10^<-6>m^3/molと見積もった。
今回得られた拡散係数は1気圧下での測定結果より2桁以上拡散係数が大きい。これは圧力効果では説明できない。他の研究結果と合わせて総合的に検討すると、拡散実験中に圧力媒体から進入してきた水がフォルステライト結晶中に欠陥を作るためと考えられる。無水条件下で拡散実験をするための特別な技術の開発が必要であることがわかった。
3. 単結晶試料によるMgSi03ペロフスカイトの珪素自己拡散実験を行った。拡散実験は、圧力23GPa、温度1870Kと2070Kで行った。単結晶試料によって得られた珪麦自已拡散係数は、他結晶試料によって得られた珪素自己拡散係数と誤差の範囲で一致する。また、有意な結晶方位依存性は見られない事が分かった。
4. MgSi03ペロフスカイトの変形実験用の単結晶試料を合成し、4軸回折計・EDS付SEMによって結晶性・化学組成・包有物の有無な調べた。単結晶試料は結晶軸方向に垂直な面で研磨した。現在、変形実験用長高圧セルの開発を行っている。

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Study of microstructures and physical properties of partial molten peridotite under differential stress

Grant number：20340120 2008 - 2010

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B) Grant-in-Aid for Scientific Research (B)

YOSHINO Takashi, YAMAZAKI Daisuke, YONEDA Akira, KATSURA Tomoo, ITOU Eiji

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Grant amount：\18720000 （ Direct expense: \14400000 、 Indirect expense：\4320000 ）

In order to determine physical properties of partially molten peridotite, we renewed operation system of a DIA-type mutianvil press with deformation finction. We compared electrical conductivities of the partial molten peridotites under hydrostatic and shear stress conditions. Preliminary result suggested that the conductivity parallel to shear direction is one order of magnitude higher than that normal to the shear direction. This result is consistent with the conductivity anisotropy observed at top of the asthenosphere and suggests a presence of partial molten zone at that depth.

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Physical properties of composite mantle rock : sample synthesis, elasticity measurement, and modeling

Grant number：19204044 2007 - 2010

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A) Grant-in-Aid for Scientific Research (A)

YONEDA Akira, KATSURA Tomoo, YAMAZAKI Daisuke, YOSHINO Takayoshi, ITOU Eiji, ANTON Shatskiy

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Grant amount：\48620000 （ Direct expense: \37400000 、 Indirect expense：\11220000 ）

Single crystal stishovite was grown in the high pressure apparatus. Its quality was checked by X ray, FTIR, and EPMA techniques. Crystal orientation was determined by precession camera. It was shaped to a rectangle with 200-500 micron meters. By detecting 20 peaks in high frequency resonance ultrasound spectroscopy, crystal elastic constants were determined. Porosity effect was systematically analyzed by using the buffer layer model in FEM analysis. The result was formulated as an elegant function of Poisson ratio, asperity, and porosity.

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Two-phase rheology of earth's lower mantle

Grant number：18340173 2006 - 2008

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B) Grant-in-Aid for Scientific Research (B)

YAMAZAKI Daisuke, KATURA Tomoo, YOSHINO Takashi, ITO Eiji, OFUJI Hiroaki

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Grant amount：\15800000 （ Direct expense: \14600000 、 Indirect expense：\1200000 ）

地球の下部マントルは主要に珪酸塩鉱物とフェロペリクレースで構成されていることから、単相ではなく2相系としてのレオロジー特性が重要であるとの認識に基づき、2相系の下部マントル岩石を実験室内で再現するために高温高圧実験を行った。実験試料の微細構造観察により、比較的低温である沈み込んでいくスラブの粘性率はフェロペリクレースのそれに制約されていること、マントル最下部で観測されている地震波速度の異方性はフェロペリクレースに起因していることを明らかにした

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地球マントル物質の電気伝導度〜水の影響について

Grant number：18740280 2006 - 2007

日本学術振興会科学研究費助成事業若手研究(B) 若手研究(B)

芳野極

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Grant amount：\3200000 （ Direct expense: \3200000 ）

本度は、上部マントルの主要構成紘物であるカンラン石、ウオズリアイト、リングウッダイトの電気伝導度への水の影響に関する研究を引き続き行った。水入りかんらん石の電気伝導度への水の寄与に関しては、前年度のうちにNature誌に公表されたが、同じ号に掲載された他のグループの同種の論文の結果と大きく異なっていることが分かった。この2つの結果の大きな違いが生じる原因として、測定温度領域の違いと我々の用いたサンプルが単結晶であるのに対し、彼らの使用したサンプルが多結晶体であることが挙げられる。彼らの測定した温度領域は1000Kを超えるような高温領域であるため、かんらん石の電気伝導度メカニズムは高温で鉄の効果による小さなポーラロン伝導が卓越してくるので、単純に水の効果によるプロトン伝導だけを示さない。そのために、低温の測定を行うことが伝導メカニズムをより分けるために必要である。そこで本年度は水入りかんらん石の電気伝導度への影響を彼らと同じく多結晶体を用いて行った。我々は、多様な水の量を含むかんらん石を合成し、その電気伝導度を含水サンプルに関しては脱水がほとんど起こらない低温(<1000K)で無水に近いサンプルは高温までの幅広い温度領域で測定した。その結果、2つのメカニズムを分離することに成功し、求めたプロトン伝導の活性化エネルギーは、単結晶から得られたものに非常に良く合うことが確かめられた。一方で、前年度行ったウオズリアイト、リングウッダイトの電気伝導度への水の影響に関する論文を投稿した。その過程で査読者はインピーダンススペクトル解析の必要性を言及した。我々の通常の電気伝導度測定は、低周波数(0.1〜0.01Hz)の交流回路であることから、サンプルと電極の反応、プロトンの分極などの効果が現れる可能性を否定できない。そこで、新たにインピーダンススペクトル解析を幅広い周波数帯(1Mhz〜0.01Hz)で実施した。この解析結果から、低周波数測定から得られた電気伝導度とインピーダンススペクトル解析から得られた電気伝導度はほぼ一致することが確認された。この結果を踏まえて、論文を改訂し、2008年1月号のNature誌に公表された。

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電気伝導度測定による珪酸塩鉱物中の連結度の解明

Grant number：03J02518 2003 - 2005

日本学術振興会科学研究費助成事業特別研究員奨励費特別研究員奨励費

芳野極

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Grant amount：\3300000 （ Direct expense: \3300000 ）

本年度は、アメリカ合衆国ニューヨーク州トロイにあるレンセラー工科大学のワトソン教授の下で、主にピストンシリンダー高圧発生装置を用いた実験を行い、固液混合系における液相の分布形態の幾何学を回収試料の電子顕微鏡写真を用いて行った。液相の連結度は電気伝導度に非常に敏感であり、その微細構造の詳細を知ることは地球深部物質の液相の移動(浸透率)、弾性特性、レオロジーなどの物性を明らかにするのに非常に有効な手段である。
本年度前半は様々な二面角、ファセットの度合いを示す液相と固相からなる系を液相の体積分率を変えることにより、固相の表面が液相にどれだけ濡らされるのか(ウエットネス)を詳細な画像解析により調査した。ウエットネスは固相の全境界(固相? 固相境界および固液境界)面積に占める固液境界の比で表される。ウエットネスは概して液相の体積分率の増加につれて増加するが、二面角の小さな系ほど増加の度合いが大きいことが分かった。特に、ファセットの度合いの小さい系に関しては、理論から予測される値に近い結果を与えた。しかしながら、ファセットの度合いが大きくなるにつれ、ウエットネスは理論曲線からはずれて低い値を持つことが示唆され、これは結晶の表面エネルギーの異方性が大きくなると粒子のクラスター化、液相が不均質にプール状に集まるためであると推測される。また、液相の体積分率とウエットネスを対数でプロットすると傾き1/2で近似できることが分かった。このことは、液相の固相内における分布は、粒子の稜部を結ぶ線状のネットワークを形成していることを示す。この結果に基づき固液2相系における弾性モデルを構築した。
本年度後半はオリビン-水系の二面角の測定を1200度Cで1? 13GPaまでの範囲で行った。4GPa以上の実験はエール大学の唐戸教授のもと行った。二面角は圧力の上昇にともない急激に減少することが測定の結果から明らかになり、おそらく10GPa付近では二面角は0度に近くなることが示された。このことは少量の水の存在が上部マントル深部で物性に対し、多大な影響を与えることを示唆する。

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Experimental high-pressure earth science （2021academic year） Late - 水1～2
Seminar on Experimental Planetary Physics （2020academic year） Other - その他
Seminar on Experimental Planetary Physics （2020academic year） Year-round - その他
Guidance in Experimental Planetary Physics 1 （2020academic year） Prophase - その他
Guidance in Experimental Planetary Physics 2 （2020academic year） Late - その他
Guidance in Experimental Planetary Physics 3 （2020academic year） Late - その他
Advanced Study in Experimental Planetary Physics （2020academic year） Year-round - その他
Advanced Study in Experimental Planetary Physics （2020academic year） Other - [後期], [前期]
Experimental high-pressure earth science （2020academic year） Late - その他

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