Updated on 2023/11/04

写真a

 
YAMASHITA Shigeru
 
Organization
Institute for Planetary Materials Associate Professor
Position
Associate Professor
Homepage
http://www.misasa.okayama-u.ac.jp/~shigeru/shigeru.html
External link

Degree

  • M.S. ( Chiba University )

  • D.Sc. ( The University of Tokyo )

Research Interests

  • Experimental Petrology

  • Petrology

  • Geology

Research Areas

  • Natural Science / Solid earth sciences

Education

  • The University of Tokyo   理学系研究科   地質学

    1988.4 - 1991.3

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    Country： Japan

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  • Chiba University   理学研究科   地学科

    1986.4 - 1988.3

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    Country： Japan

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  • Chiba University   理学部   地学科

    1982.4 - 1986.3

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Research History

  • Geophysical Laboratory, Carnegie Institution of Washington   Visiting Scientist

    2009.1 - 2009.4

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  • Okayama University   Institute for Planetary Materials   Associate Professor

    2005

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  • Universitaet Hannover   Institut fuer Mineralogie   Alexander von Humboldt Research Fellow

    2001.12 - 2003.2

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

    1998 - 2004

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

    1993.10 - 1998.9

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  • The University of Tokyo   Earthquake Research Institute   JSPS Postdoctoral Research Fellow

    1992.4 - 1993.9

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  • Gakushu-in College   Part-time lecturer (Earth Sciences)

    1992.4 - 1993.9

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Professional Memberships

  • Japan Society of High Pressure Science and Technology

    2006

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  • American Geophysical Union

    1991

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  • Volcanological Society of Japan

    1986

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  • Geological Society of Japan

    1985

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Committee Memberships

  • Volcanological Society of Japan   Bulletin of Volcanological Society of Japan, Associate Editor  

    2010 - 2014   

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    Committee type：Academic society

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  • Geological Society of Japan   "The Island Arc", Associate Editor  

    1998 - 2003   

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    Committee type：Academic society

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  • Volcanological Society of Japan   Bulletin of Volcanological Society of Japan, Associate Editor  

    1994 - 1995   

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    Committee type：Academic society

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Papers

  • Modification for the matrix effect in SIMS-derived water contents of silicate glasses

    Kenji Shimizu, Takayuki Ushikubo, Takeshi Kuritani, Naoto Hirano, Shigeru Yamashita

    GEOCHEMICAL JOURNAL   56 ( 6 )   223 - 230   2022

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Geochemical Society of Japan  

    Analyses of elemental abundances by secondary ion mass spectrometry (SIMS) require matrix-matched standard samples to account for the matrix effect on correction factors. This requirement makes it difficult to obtain accurate results for geological samples of variable chemistry. In this study, we prepared 39 volcanic glasses of foiditic, basaltic, basaltic andesitic, rhyolitic and pure SiO2 compositions, including synthetic samples and natural samples collected from the deep seafloor. The measured H2O contents of these samples were in the range 0.02-4.8 wt%. We showed that calibration curves (H2O content vs. (OH-)-O-16/Si-30(SIMS)- ratio) differed according to the composition of the volcanic glasses. Our results demonstrated that for a particular (OH)-O-16/Si-30(SIMS) ratio, water content could differ by up to a factor of five, depending on the composition of the volcanic glass. Although the correction factor (the slope of the calibration curve for water [H2O/((OH-)-O-16/Si-30(-))(SIMS)]) was weakly correlated with SiO2 content, we identified a stronger correlation with the molar weight (g mol(-1), on a one-oxygen mole basis) of the silicate glasses. Our results suggest that modification of the correction factor for the matrix effect on SIMS-based H2O content of volcanic glasses according to their molar weights provides more accurate water contents of silicate glasses, regardless of their chemical composition and water content and without the need for a series of standard glasses of known water contents.

    DOI： 10.2343/geochemj.gj22019

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  • Nonlinear effects of hydration on high-pressure sound velocities of rhyolitic glasses Reviewed

    Jesse T. Gu, Suyu Fu, James E. Gardner, Shigeru Yamashita, Takuo Okuchi, Jung-Fu Lin

    American Mineralogist   106 ( 7 )   1143 - 1152   2021.7

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

    <title>Abstract</title>
    Acoustic compressional and shear wave velocities (VP, VS) of anhydrous (AHRG) and hydrous rhyolitic glasses (HRG) containing 3.28 wt% (HRG-3) and 5.90 wt% (HRG-6) total water concentration (H2Ot) have been measured using Brillouin light scattering (BLS) spectroscopy up to 3 GPa in a diamond-anvil cell at ambient temperature. In addition, Fourier-transform infrared (FTIR) spectroscopy was used to measure the speciation of H2O in the glasses up to 3 GPa. At ambient pressure, HRG-3 contains 1.58 (6) wt% hydroxyl groups (OH–) and 1.70 (7) wt% molecular water (H2Om) while HRG-6 contains 1.67 (10) wt% OH– and 4.23 (17) wt% H2Om where the numbers in parentheses are ±1σ. With increasing pressure, very little H2Om, if any, converts to OH– within uncertainties in hydrous rhyolitic glasses such that HRG-6 contains much more H2Om than HRG-3 at all experimental pressures. We observe a nonlinear relationship between high-pressure sound velocities and H2Ot, which is attributed to the distinct effects of each water species on acoustic velocities and elastic moduli of hydrous glasses. Near ambient pressure, depolymerization due to OH– reduces VS and G more than VP and KS. VP and KS in both anhydrous and hydrous glasses decrease with increasing pressure up to ~1–2 GPa before increasing with pressure. Above ~1–2 GPa, VP and KS in both hydrous glasses converge with those in AHRG. In particular, VP in HRG-6 crosses over and becomes higher than VP in AHRG. HRG-6 displays lower VS and G than HRG-3 near ambient pressure, but VS and G in these glasses converge above ~2 GPa. Our results show that hydrous rhyolitic glasses with ~2–4 wt% H2Om can be as incompressible as their anhydrous counterpart above ~1.5 GPa. The nonlinear effects of hydration on high-pressure acoustic velocities and elastic moduli of rhyolitic glasses observed here may provide some insight into the behavior of hydrous silicate melts in felsic magma chambers at depth.

    DOI： 10.2138/am-2021-7597

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  • Precometary organic matter: A hidden reservoir of water inside the snow line Reviewed

    Hideyuki Nakano, Naoki Hirakawa, Yasuhiro Matsubara, Shigeru Yamashita, Takuo Okuchi, Kenta Asahina, Ryo Tanaka, Noriyuki Suzuki, Hiroshi Naraoka, Yoshinori Takano, Shogo Tachibana, Tetsuya Hama, Yasuhiro Oba, Yuki Kimura, Naoki Watanabe, Akira Kouchi

    Scientific Reports   10 ( 1 )   2020.12

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

    <title>Abstract</title>The origin and evolution of solar system bodies, including water on the Earth, have been discussed based on the assumption that the relevant ingredients were simply silicates and ices. However, large amounts of organic matter have been found in cometary and interplanetary dust, which are recognized as remnants of interstellar/precometary grains. Precometary organic matter may therefore be a potential source of water; however, to date, there have been no experimental investigations into this possibility. Here, we experimentally demonstrate that abundant water and oil are formed via the heating of a precometary-organic-matter analog under conditions appropriate for the parent bodies of meteorites inside the snow line. This implies that H2O ice is not required as the sole source of water on planetary bodies inside the snow line. Further, we can explain the change in the oxidation state of the Earth from an initially reduced state to a final oxidized state. Our study also suggests that petroleum was present in the asteroids and is present in icy satellites and dwarf planets.

    DOI： 10.1038/s41598-020-64815-6

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    Other Link： http://www.nature.com/articles/s41598-020-64815-6

  • Magma generation conditions at the Akita-Komagatake volcano, Northeast Japan arc: Implications of across-arc variations in mantle melting parameters Reviewed

    Kuritani, T, Kanai, C, Yamashita, S, Nakagawa, M

    Lithos   348-349   105197 - 105197   2019.12

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

    Akita-Komagatake is an active volcano in the Northeast Japan arc with a slab depth (H) of ~110 km. In this study, magma generation conditions were estimated for basaltic products from the volcano to examine the thermal structure of the sub-arc mantle and the across-arc variations in the parameters related to magma genesis. The studied basalts have the highest MgO content (~6 wt%) among the products from the volcano and contain ~15% plagioclase phenocrysts, ~5% olivine phenocrysts, and <1% pyroxene phenocrysts. The water content of the melt was estimated to be ~4 wt% by melt inclusions in the phenocrysts using plagioclase–melt hygrometry. Multi-component thermodynamic analyses suggest that the primary magma was generated by ~14% melting of the source mantle with ~0.5 wt% H O at ~1275 °C and ~1.3 GPa. The estimated pressure condition of ~1.3 GPa coincides well with the low-velocity anomaly observed in the mantle at ~40 km depth beneath the volcano. By comparing the results from Akita-Komagatake to the published results of the frontal-arc Iwate volcano (H = ~90 km) and the rear-arc Sannome-gata volcano (H = ~150 km), which are arranged along a cross-arc line in the Northeast Japan arc, we found that the pressure conditions of the magma generation are ~1.3 GPa at both Iwate and Akita-Komagatake, which are significantly lower than the ~1.8 GPa at the rear-arc Sannome-gata volcano. The source mantle temperature of ~1275 °C at ~1.3 GPa beneath Akita-Komagatake is higher than the ~1250 °C at ~1.3 GPa beneath Iwate, which suggests that the ascending flow of the mantle wedge corner flow may reach the shallowest levels beneath Akita-Komagatake. It was also demonstrated that the depth at which fluid was released from the subducting slab tends to increase for the volcanoes with increasing H. 2

    DOI： 10.1016/j.lithos.2019.105197

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  • Evolution, hydrothermal assimilation, and ascent of magma inferred from volatile contents in MORB glasses: An example from thick lava pile at IODP Site 1256 Reviewed

    Takashi Sano, Shigeru Yamashita

    Lithos   346-347   105143 - 105143   2019.11

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

    A continuous section through an 811 m-thick lava pile of mid-ocean ridge basalts at Integrated Ocean Drilling Program Site 1256 provides important constraints on the variation with depth of volatile element (H2O, CO2, S and Cl) contents in fresh matrix glasses to understand evolution of magma, condition of magma ascent, and degree of hydrothermal assimilation. The lava pile is divided into two groups based on eruption location: off-axis basalts of upper portion (250-534 m beneath seafloor, mbsf) and on-axis basalts of lower portion (534-1061 mbsf). The lava pile is composed of pillow, sheet, and massive lavas that include thin (<2 m) hyaloclastite intervals.Variations of H2O and major element contents in Site 1256 matrix glasses can be explained by fractional crystallization of one primitive basalt (MgO, 7.7 wt%) at the pressure of a melt lens (top of axial magma chamber). CO2/Nb and S/Dy in a large majority of fresh matrix glasses are lower than undegassed ratios, and these facts indicate that CO2 and S losses occurred during differentiation within the melt lens and/or magma transport to the seafloor. Saturation pressures calculated from dissolved CO2 and H2O contents give a wide range of pressures from sea floor (similar to 25 MPa) to axial magma chamber (similar to 60 MPa). Many off-axis glasses have saturation pressures of seafloor, but on-axis glasses have high saturation pressures up to axial magma chamber depths. The saturation pressures of off-axis glasses decrease with decreasing depth (i.e., with increasing distance from the axis). These observations indicate that the many off-axis glasses were highly degassed because their source magmas travelled for long rime periods from melt lens to off-axis seafloor locations. On the other hand, on-axis glasses were less degassed because magma transport times to on-axis locations were shorter than those for off-axis locations. The most distinctive characteristic for the Site 1256 glasses is their higher Cl/Nb than any other mid-ocean ridge basalt glasses. The strong Cl enrichment is explained by assimilation of hydrothermal brines. Beneath Site 1256, the melt lens was very shallow (<1.2 km) and hydrothermal circulation of high-salinity brines with variable salinities would reach easily to the melt lens. (C) 2019 Elsevier B.V. All rights reserved.

    DOI： 10.1016/j.lithos.2019.07.010

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  • An automated laser fluorination technique for high-precision analysis of three oxygen isotopes in silicates Reviewed

    Nak Kyu Kim, Minoru Kusakabe, Changkun Park, Jong Ik Lee, Keisuke Nagao, Yuma Enokido, Shigeru Yamashita, Sun Young Park

    Rapid Communications in Mass Spectrometry   33 ( 7 )   641 - 649   2019.4

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

    RationaleThe three oxygen isotopes in terrestrial/extraterrestrial silicates can provide geochemical and cosmochemical information about their origin and secondary processes that result from isotopic exchange. A laser fluorination technique has been widely used to extract oxygen from silicates for O-17 and O-18 measurements by isotope ratio mass spectrometry. Continued improvement of the techniques is still important for high-precision measurement of oxygen-isotopic ratios.MethodsWe adopted an automated lasing technique to obtain reproducible fluorination of silicates using a CO2 laser-BrF5 fluorination system connected online to an isotope ratio mass spectrometer. The automated lasing technique enables us to perform high-precision analysis of the three oxygen isotopes of typical reference materials (e.g., UWG2 garnet, NBS28 quartz and San Carlos olivine) and in-house references (mid-ocean ridge basalt glass and obsidian). The technique uses a built-in application of laser control with which the laser power can be varied in a programmed manner with a defocused beam which is in a fixed position.ResultsThe oxygen isotope ratios of some international reference materials analyzed by the manual lasing technique were found to be isotopically lighter with wider variations in O-18 values, whereas those measured by the automated lasing technique gave better reproducibility (less than 0.2, 2SD). The O-17 values, an excess of the O-17 value relative to the fractionation line, also showed high reproducibility (+/- 0.02 parts per thousand, 2SD).ConclusionsThe system described herein provides high-precision O-17 and O-18 measurements of silicate materials. The use of the automated lasing technique followed by careful and controlled purification procedures is preferred to achieve satisfactory isotopic ratio results.

    DOI： 10.1002/rcm.8389

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  • In situ spectroscopic study of water speciation in the depolymerized Na2Si2O5 melt Reviewed

    Nadezda Chertkova, Shigeru Yamashita

    Chemical Geology   409   149 - 156   2015.8

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    DOI： 10.1016/j.chemgeo.2015.05.012

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  • High-pressure synthesis and application of a 13C diamond pressure sensor for experiments in a hydrothermal diamond anvil cell Reviewed

    Nadezda Chertkova, Shigeru Yamashita, Eiji Ito, Akira Shimojuku

    Mineralogical Magazine   78 ( 7 )   1677 - 1685   2014.12

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Mineralogical Society  

    <title>Abstract</title>Polycrystalline, cubic 13C diamond was synthesized from amorphous carbon in the Kawai-type multianvil apparatus at 21 GPa and at a temperature greater than 2350ºC. The polycrystalline diamond was homogeneous with a small grain size (10–20 μm) and a sharp Raman peak, and thereby was suitable as a pressure sensor for the experiments in a hydrothermal diamond anvil cell. Pressure- and temperature-dependence of the Raman shift of the synthesized 13C diamond was investigated in situ at simultaneous high pressures and high temperatures in the hydrothermal diamond anvil cell, using the ruby fluorescence line, quartz Raman shift and H2O phase transitions as pressure references. It was observed that the frequency shift with pressure is independent of temperature and <italic>vice versa</italic> up to 500ºC and 4.2 GPa. The present study indicates that the 13C diamond Raman shift can be used for pressure determination with an accuracy better than ±0.3 GPa under the conditions examined.

    DOI： 10.1180/minmag.2014.078.7.11

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  • Speciation of reduced C–O–H volatiles in coexisting fluids and silicate melts determined in-situ to ∼1.4GPa and 800°C Reviewed

    Bjorn O. Mysen, Shigeru Yamashita

    Geochimica et Cosmochimica Acta   74 ( 15 )   4577 - 4588   2010.8

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

    DOI： 10.1016/j.gca.2010.05.004

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  • Nominally hydrous magmatism on the Moon Reviewed

    F. M. McCubbin, A. Steele, E. H. Hauri, H. Nekvasil, S. Yamashita, R. J. Hemley

    Proceedings of the National Academy of Sciences   107 ( 25 )   11223 - 11228   2010.6

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    DOI： 10.1073/pnas.1006677107

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  • Strength contrast between plagioclase and olivine at water-rich Moho depths Reviewed

    Shintaro AZUMA, Ikuo KATAYAMA, Ken-ichi HIRAUCHI, Shigeru YAMASHITA

    Journal of Mineralogical and Petrological Sciences   105 ( 5 )   286 - 290   2010

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japan Association of Mineralogical Sciences  

    DOI： 10.2465/jmps.100618b

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

    DOI： 10.1016/j.pepi.2008.06.001

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  • Solubility and solution mechanisms of NOH volatiles in silicate melts at high pressure and temperature - amine groups and hydrogen fugacity Reviewed

    B. O. Mysen, S. Yamashita, N. Chertkova

    American Mineralogist   93 ( 11-12 )   1760 - 1770   2008.11

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

    DOI： 10.2138/am.2008.2879

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  • Water speciation in sodium silicate glasses based on NIR and NMR spectroscopy Reviewed

    Shigeru Yamashita, Harald Behrens, Burkhard C. Schmidt, Ray Dupree

    Chemical Geology   256 ( 3-4 )   231 - 241   2008.11

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

    DOI： 10.1016/j.chemgeo.2008.06.029

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  • Water speciation in hydrous sodium tetrasilicate and hexasilicate melts: Constraint from high temperature NIR spectroscopy Reviewed

    Harald Behrens, Shigeru Yamashita

    Chemical Geology   256 ( 3-4 )   306 - 315   2008.11

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    DOI： 10.1016/j.chemgeo.2008.06.053

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  • Origin of compositional heterogeneity within Tochinoki andesitic lava flow from the western part of Aso caldera Reviewed

    MIYOSHI Masaya, HASENAKA Toshiaki, MORI Yasushi, YAMASHITA Shigeru

    Japanese Magazine of Mineralogical and Petrological Sciences   36 ( 1 )   15 - 29   2007

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Association of Mineralogical Sciences  

    A composite lava flow is found in core samples of Tochinoki lava unit, one of the post-caldera volcanic products distributed in the western part of Aso caldera. Including core and surface outcrop samples, Tochinoki lava shows two compositionally different lava types. One is silicic (SiO2 63-66 wt%) and phenocryst-rich (8-16 vol%), and the other is mafic (SiO2 60-62 wt%) and phenocryst-poor (< 7 vol%). Mass balance calculation and trace element modeling show that the compositional variation found among Tochinoki core samples are explained by the fractional crystallization of plagioclase, clinopyroxene, orthopyroxene and magnetite phenocrysts from the most mafic lava. Tochinoki composite lava flow is probably produced by the viscous segregation of compositionally distinct magmas ascending simultaneously in the conduit as proposed by Inyo Obsidian Dome drilling project. Bulk rock composition and mineral chemistry indicate that mafic-silicic pairs observed in Tochinoki core samples are different from those in outcrop samples. This difference probably suggests the existence of contemporaneous multiple flow units in the Tochinoki lava unit.

    DOI： 10.2465/gkk.36.15

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    Other Link： https://jlc.jst.go.jp/DN/JALC/00291363587?from=CiNii

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

    DOI： 10.1038/nature05223

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    Other Link： http://www.nature.com/articles/nature05223

  • Melt inclusion analysis of the Unzen 1991–1995 dacite: implications for crystallization processes of dacite magma Reviewed

    Koshi Nishimura, Tatsuhiko Kawamoto, Tetsuo Kobayashi, Takeshi Sugimoto, Shigeru Yamashita

    Bulletin of Volcanology   67 ( 7 )   648 - 662   2005.8

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    DOI： 10.1007/s00445-004-0400-8

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    Other Link： http://link.springer.com/article/10.1007/s00445-004-0400-8/fulltext.html

  • Experimental petrology of basement lavas from Ocean Drilling Program Leg 192: implications for differentiation processes in Ontong Java Plateau magmas Reviewed

    Takashi Sano, Shigeru Yamashita

    Geological Society, London, Special Publications   229 ( 1 )   185 - 218   2004

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Geological Society of London  

    <title>Abstract</title>Melting relations of the basement lavas drilled from the Ontong Java Plateau during ODP Leg 192 were experimentally determined at 1150–1250°C and 0.1–190 MPa under the oxygen fugacity along the fayalite-magnetite-quartz (FMQ) and cobalt-cobalt oxide (CCO) buffers. The basement lavas were classified into two types according to phenocryst assemblage and whole-rock composition: one type is low in MgO (&lt;8 wt%) and olivine + plagioclase + augite-phyric (Kwaimbaita type); and the other is rich in MgO (&gt;8 wt%) and olivine-phyric (Kroenke type). One sample was chosen from each type as a starting material of the melting experiments. The experimental results demonstrate that the variations in phenocryst assemblage and whole-rock composition in the basement lavas can be modelled adequately by fractional crystallization processes in a shallow magma chamber (&lt;6 km in depth). The experimentally determined mineral-melt equilibria, in combination with detailed petrographical investigation, revealed that the vast majority of phenocrysts are in equilibrium with their host magma composition, but some are not. The latter include unusually An-rich parts of plagioclase phenocrysts in the Kwaimbaita-type lavas. These An-rich parts probably crystallized in a mushy boundary layer along the wall of the magma chamber where the melt was relatively rich in H2O. Some olivine phenocrysts in the Kroenke-type lavas show reverse zoning, with core compositions that can be in equilibrium with the Kwaimbaita-type magmas. The cores of these olivine phenocrysts were most probably assimilated from a solidified pile of the Kwaimbaita-type lavas when the Kroenke-type magmas ascended through it.

    DOI： 10.1144/gsl.sp.2004.229.01.12

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  • Mid infrared throughput with 5 um aperture for H2O determination of an andesitic glass: Comparison of synchrotron radiation source at SPring-8 with conventional light sources. Reviewed

    Tatsuhiko Kawamoto, Hiroyuki Kagi, Shigeru Yamashita, Tomoko Handa, Kyoko Matsukage, Yuka Ikemoto, Taro Moriwaki, Hiroaki Kimura

    GEOCHEMICAL JOURNAL   37 ( 2 )   253 - 259   2003

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Geochemical Society of Japan  

    DOI： 10.2343/geochemj.37.253

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  • Experimental Study of the Effect of Temperature on Water Solubility in Natural Rhyolite Melt to 100 MPa Reviewed

    S. Yamashita

    Journal of Petrology   40 ( 10 )   1497 - 1507   1999.10

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Oxford University Press (OUP)  

    DOI： 10.1093/petroj/40.10.1497

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  • Preparation of thin glass wafer for infrared spectroscopy Reviewed

    Ogo, Y, Yamashita, S

    Bulletin of the Volcanological Society of Japan   44 ( 5 )   251 - 254   1999

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    Language：Japanese   Publisher：Volcanological Society of Japan  

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  • Infrared spectroscopy of hydrous glasses of arc magma compositions. Reviewed

    Shigeru Yamashita, Toshihiro Kitamura, Minoru Kusakabe

    GEOCHEMICAL JOURNAL   31 ( 3 )   169 - 174   1997

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Geochemical Society of Japan  

    DOI： 10.2343/geochemj.31.169

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  • Temporal variation in primary magma compositions in the northeast Japan Arc Reviewed

    Shigeru Yamashita, Yoshiyljki Tatsumi, Susumu Nohda

    The Island Arc   5 ( 3 )   276 - 288   1996.9

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Wiley  

    DOI： 10.1111/j.1440-1738.1996.tb00032.x

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  • Thermal and geochemical evolution of the mantle wedge in the northeast Japan arc: 2. Contribution from geochemistry Reviewed

    Shigeru Yamashita, Yoshiyuki Tatsumi

    Journal of Geophysical Research: Solid Earth   99 ( B11 )   22285 - 22293   1994.11

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

    DOI： 10.1029/94jb00282

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  • Thermal and geochemical evolution of the mantle wedge in the northeast Japan arc: 1. Contribution from experimental petrology Reviewed

    Yoshiyuki Tatsumi, Yoshitsugu Furukawa, Shigeru Yamashita

    Journal of Geophysical Research: Solid Earth   99 ( B11 )   22275 - 22283   1994.11

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

    DOI： 10.1029/94jb00283

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  • Experimental petrology of basement basaltic rocks from ODP Leg127/128 Sites 794 and 797, Japan Sea Reviewed

    Yamashita, S, Fujii, T

    Proceedings of the Ocean Drilling Program, Scientific Results   127/128 ( Pt.2 )   891 - 898   1992

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  • 40Ar-39Ar analyses of volcanic rocks recovered from the Japan Sea floor by Leg127/128: constraint on the formation age of the Japan Sea Reviewed

    Kaneoka, I, Takigami, Y, Takaoka, N, Yamashita, S, Tamaki, K

    Proceedings of the Ocean Drilling Program, Scientific Results   127/128 ( Pt.2 )   819 - 836   1992

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  • Geochemistry of Leg127 basalts: implication for the evolutionary history of the Japan Sea backarc basin Reviewed

    Nohda, S, Tatsumi, Y, Yamashita, S, Fujii, T

    Proceedings of the Ocean Drilling Program, Scientific Results   127/128 ( Pt.2 )   899 - 904   1992

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

    CiNii Article

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  • Origin of felsic magmas at Meiyo-Daini seamount in Yamato backarc basin, Japan Sea Reviewed

    Shigeru Yamashita

    Bulletin of Volcanological Society of Japan   36 ( 4 )   431 - 441   1991

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Volcanological Society of Japan  

    Detailed petrological study was made on the felsic volcanic rocks dredged from the Meiyo-Daini seamount in the Yamato backarc basin, Japan Sea. The Meiyo-Daini seamount was created as a subaqueous volcanic edifice together with the other seamounts in the basin at the latest stage of backarc rifting. The issued felsic volcanic rocks contain mafic inclusions with varying sizes and textures. Mass balance calculation suggests that the host felsic magmas were differentiated from the mafic parent by fractionation of amphibole and plagioclase feldspar. On the other hand, the derivative felsic magmas have phenocryst assemblages which are different from that expected from the fractional crystallization model. These puzzling phenocryst assemblages are probable reflection of the following magma plumbing system; the felsic magmas were produced in deep-seated magma reservoir(s) (>2 kbar;>ca. 7 km below surface), and then ascent to crystallize the present phenocryst assemblages consuming the crystals relevant to the differentiation. The mafic inclusions could be less differentiated portion of the deep-seated magma reservoir(s). The inferred magma plumbing system is consistent with the fact that the Yamato backarc basin is underlain by anomalously deep seismic Moho.

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MISC

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

    M. A. G. M. Manthilake, T. Matsuzaki, T. Yoshino, S. Yamashita, E. Ito, T. Katsura

    GEOCHIMICA ET COSMOCHIMICA ACTA   71 ( 15 )   A621 - A621   2007.8

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    Language：English   Publishing type：Research paper, summary (international conference)   Publisher：PERGAMON-ELSEVIER SCIENCE LTD  

    Web of Science

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  • Micro-IR spectroscopy of water-bearing silicate glasses: an application to experimental petrology Invited

    Shigeru Yamashita

    41 ( 2 )   15 - 18   1999

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    Authorship：Lead author,　Corresponding author   Language：Japanese  

    CiNii Article

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  • Petrology of basement basaltic rocks from ODP Leg 127 sites, Japan Sea: its implication for transportation of wedge mantle materials during backarc spreading Invited

    Shigeru Yamashita

    Chikyu   6   229 - 232   1992

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    Authorship：Lead author,　Corresponding author   Language：Japanese  

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  • Petrology of volcanic rocks from seamounts in Yamato backarc basin, Japan Sea Invited

    Shigeru Yamashita

    Kaiyo Kagaku   20   664 - 669   1988

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    Authorship：Lead author,　Corresponding author   Language：Japanese  

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Presentations

  • Pressure dependence of water speciation in albitic melts determined in-situ at high pressures and high temperatures International conference

    Shigeru Yamashita

    Japan Geoscience Union Meeting 2022  2022.5.31  Japan Geoscience Union

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    Event date： 2022.5.22 - 2022.6.3

    Language：English   Presentation type：Poster presentation  

    Venue：Makuhari, Chiba   Country：Japan  

  • Pressure dependence of water speciation in albitic melts determined in-situ at high pressures and high temperatures

    Shigeru Yamashita

    Japan Geoscience Union Meeting 2022  2022.5.31 

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    Event date： 2022.5.22 - 2022.6.3

    Language：English   Presentation type：Poster presentation  

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  • Organic compounds as fluid sources in the DAC experiments involving volatiles International conference

    Nadezda Chertkova, Tadashi Kondo, Shigeru Yamashita

    Japan Geoscience Union Meeting 2022  2022.5.29  Japan Geoscience Union

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    Event date： 2022.5.22 - 2022.6.3

    Language：English   Presentation type：Poster presentation  

    Venue：Makuhari, Chiba   Country：Japan  

  • Organic compounds as fluid sources in the DAC experiments involving volatiles

    Nadezda Chertokova, Takashi Kondo, Shigeru Yamashita

    Japan Geoscience Union Meeting 2022  2022.5.29 

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    Event date： 2022.5.22 - 2022.6.3

    Language：English   Presentation type：Poster presentation  

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  • Hydrothermal ammoniation of chondrites: Implications for Ceres

    Izawa, M.R.M, Koutoula, E, Stancu, M.-N, Yamashita, S, Okuchi, T, Cloutis, E. A, Jephcoat, A. P, Reddy, V

    52nd Lunar and Planetary Science Conference  2021.3 

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    Event date： 2021.3.15 - 2021.3.19

    Language：English   Presentation type：Poster presentation  

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  • Verification and correction of matrix effect on water concentration of volcanic glasses by SIMS

    Shimizu, K, Ushikubo, T, Kuritani, T, Hirano, N, Yamashita, S

    Goldschmidt Virtual 2020  2020.6.24 

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    Event date： 2020.6.21 - 2020.6.26

    Language：English   Presentation type：Poster presentation  

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  • Anomalous elasticity of dry and hydrous rhyolitic glasses up to 3 GPa

    Jesse Gu, Suyu Fu, James E. Gardner, Shigeru Yamashita, Takuo Okuchi, Jung-Fu Lin

    American Geophysical Union 2019 Fall Meeting  2019.12.12 

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    Event date： 2019.12.9 - 2019.12.13

    Language：English   Presentation type：Poster presentation  

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  • 揮発性元素から推測した中央海嶺玄武岩マグマの分化と上昇過程

    佐野貴司, 山下茂

    日本火山学会2019年度秋季大会  2019.9.26 

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    Event date： 2019.9.25 - 2019.9.27

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • Experimental study of the effect of composition on water solubility in natural silicate melts

    Shigeru Yamashita

    Japan Geoscience Union Meeting 2019  2019.5 

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    Event date： 2019.5.25 - 2019.5.30

    Language：English   Presentation type：Oral presentation (general)  

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  • Experimental modeling of eclogite and C-O-H fluid interaction in the subduction zones

    Nadezda Chertkova, Shigeru Yamashita, Hiroaki Ohfuji, Tetsuo Irifune, Hirokazu Kadobayashi, Yoshitaka Yamamoto

    Japan Geoscience Union Meeting 2019  2019.5 

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    Event date： 2019.5.25 - 2019.5.30

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  • Electrical Conductivity Measurement of rhyolite and andesite glasses

    Haraguchi, Y, Yoshino, T, Yamashita, S, Nakamoto, M, Suzuki, M, Fuji-ta, K, Tanaka, T

    Joint Symposium of Misasa 2019 and CMC  2019.3.21 

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    Event date： 2019.3.18 - 2019.3.21

    Language：English   Presentation type：Oral presentation (general)  

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  • Probing basalt–5.75H2O–CH4 system by in situ vibrational spectroscopy

    Chertkova, N, Yamashita, S, Ohfuji, H, Irifune, T, Kadobayashi, H, Yamamoto, Y

    Joint Symposium of Misasa 2019 and CMC  2019.3.20 

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    Event date： 2019.3.18 - 2019.3.21

    Language：English   Presentation type：Oral presentation (general)  

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  • In situ vibrational spectroscopy of the dehydration of talc in the system MgO-SiO2-H2O

    Shigeru Yamashita

    Joint Symposium of Misasa 2019 and CMC  2019.3.19 

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    Event date： 2019.3.18 - 2019.3.21

    Language：English   Presentation type：Oral presentation (general)  

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  • Dehydration kinetics of talc in the system MgO-SiO2-H2O probed in-situ by vibrational spectroscopy at high pressure and hight temperature

    Shigeru Yamashita

    Japan Geoscience Union Meeting 2018  2018.5.20 

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    Event date： 2018.5.20 - 2018.5.24

    Language：English   Presentation type：Oral presentation (general)  

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  • Determination of water content of natural talc: application to a recipe for hydrogen manometry

    Shigeru Yamashita

    JpGU-AGU joint meeting 2017  2017.5.22 

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    Event date： 2017.5.20 - 2017.5.24

    Language：English   Presentation type：Poster presentation  

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  • The effect of magma density, assimilation, and eruption location on volatile and halogen contents in MORB glasses: an example from IODP site 1256

    Takashi Sano, Shigeru Yamashita

    Japan Geoscience Union Meeting 2016  2016.5 

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    Event date： 2016.5.22 - 2016.5.26

    Language：English   Presentation type：Oral presentation (general)  

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  • Solution mechanism of water in depolymerized silicate melts

    Nadezda Chertkova, Shigeru Yamashita

    Japan Geoscience Union Meeting 2014  2014.5 

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    Event date： 2014.4.28 - 2014.5.2

    Language：English   Presentation type：Poster presentation  

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  • Determination of water speciation in hydrous Na2Si2O5 melt at high temperature and high pressure

    Nadezda Chertkova, Shigeru Yamashita

    IAVCEI 2013 Scientific Assembly  2013.7 

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    Event date： 2013.7.20 - 2013.7.24

    Language：English   Presentation type：Poster presentation  

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  • Experimental determinations of water solubility in the Shinmoe-dake 2011 dacite melt to 150 MPa

    山下茂, Chertkova, N.

    Japan Geoscience Union Meeting 2013  2013.5 

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    Event date： 2013.5.19 - 2013.5.24

    Language：Japanese   Presentation type：Poster presentation  

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  • Speciation of N-O-H volatiles in coexisting fluids and silicate melts determined in-situ at high pressures and high temperatures under reducing conditions

    Yamashita, S, Mysen, B.O

    Joint Symposium of Misasa-2012 and Geofluid-2  2012.3 

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    Event date： 2012.3.17 - 2012.3.21

    Language：English   Presentation type：Poster presentation  

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  • Synthesis of 13C diamond pressure marker for in-situ experiment

    Chertkova, N, Yamashita, S, Ito, E, Shimojuku, A

    Joint Symposium of Misasa-2012 and Geofluid-2  2012.3 

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    Event date： 2012.3.17 - 2012.3.21

    Language：English   Presentation type：Poster presentation  

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  • Optical pressure sensors for DAC experiment: application in high-pressure studies

    Chertkova, N, Yamashita, S

    Japan Geoscience Union Meeting 2011  2011.5 

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    Event date： 2011.5.22 - 2011.5.27

    Language：English   Presentation type：Poster presentation  

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  • Pressure and temperature dependence of 13C diamond Raman shift determined in-situ to 1.27GPa and 800°C: application to pressure sensor for high temperature diamond anvil cell experiments

    Yamashita, S, Mysen, B.O.

    Japan Geoscience Union Meeting 2011  2011.5 

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    Event date： 2011.5.21 - 2011.5.27

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • Speciation and solubility behaviors of C-O-H-N volatiles in coexisting melts and fluids at high pressure and temperature with controlled hydrogen fugacity. Invited

    Mysen, B.O, Fogel, M, Yamashita, S

    2010 Western Pacific Geophysics Meeting  2010.6 

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    Event date： 2010.6.22 - 2010.6.25

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

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  • Speciation of N-O-H Volatiles in Coexisting Fluids and Silicate Melts Determined In-situ at High Pressures and High Temperatures Under Reducing Conditions. Invited

    Yamashita, S, Mysen, B.O

    2010 Western Pacific Geophysics Meeting  2010.6 

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    Event date： 2010.6.22 - 2010.6.25

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

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  • Speciation and solubility of reduced C-O-H fluids in coexisting fluids and silicate melts determined in-situ to 1.45 GPa and 800˚C.

    Mysen, B.O, Yamashita, S, Fogel, M

    Goldschmidt Conference 2010  2010.6 

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    Event date： 2010.6.13 - 2010.6.18

    Language：English   Presentation type：Oral presentation (general)  

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  • Structure and Properties of Silicate-Saturated Fluids in the System Na2O-Al2O3-SiO2-H2O Determined in situ at High Temperature and Pressure.

    Mysen, B.O, Yamashita, S

    Goldschmidt Conference 2010  2010.6 

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    Event date： 2010.6.13 - 2010.6.18

    Language：English   Presentation type：Oral presentation (general)  

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  • Speciation of N-O-H volatiles in coexisting fluids and silicate melts determined in-situ under reduced conditions

    Yamashita, S, Mysen, B.O

    Japan Geoscience Union Meeting 2010  2010.5 

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    Event date： 2010.5.23 - 2010.5.28

    Language：English   Presentation type：Poster presentation  

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  • From N2 to NHx groups in silicate melts governed by fH2 at high pressure and temperature.

    Mysen, B.O, Yamashita, S, Chertkova, N

    Goldschmidt Conference 2008  2008.6 

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    Event date： 2008.6.13 - 2008.6.18

    Language：English   Presentation type：Oral presentation (general)  

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  • In situ observation of liquids at high temperature and high pressure.

    Yamashita, S, Kanzaki, M, Mysen, B. O

    International Symposium MISASA-3, Origin, Evolution and Dynamics of the Earth  2008.3 

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    Event date： 2008.3.22 - 2008.3.23

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  • Water speciation in silicate glasses and melts - an overview.

    Behrens, H, Yamashita, S, Schmidt, B

    8th SILICATE MELT WORKSHOP  2007.10 

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    Event date： 2007.10.1 - 2007.10.5

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  • Electrical conductivity of wadsleyite

    Geeth, M, Yoshino, T, Matsuzaki, T, Yamashita, S, Ito, E, Katsura., T

    Japan Geoscience Union Meeting 2007  2007.5.24 

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    Event date： 2007.5.19 - 2007.5.24

    Language：English   Presentation type：Oral presentation (general)  

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  • In situ observation of silicate speciation in liquids in the system K2Si4O9-H2O at high temperature and high pressure.

    Yamashita, S, Kanzaki, M, Mysen, B. O

    Japan Geoscience Union Meeting 2007  2007.5.22 

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    Event date： 2007.5.19 - 2007.5.24

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  • Energetic property of magma degassing: a thermodynamic model.

    Yamashita, S

    International Seminar AASPP-Misasa, Magmatic gases, their trip from the mantle to the surface of the Earth.  2006.2.27 

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    Event date： 2006.2.27

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  • Composition dependence of molar absorption coefficient of mid-infrared water species band.

    Yamashita, S

    Misasa International Symposium MISASA-2, The Evolution of Early Stage of Earth and Solar System.  2006.2 

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    Event date： 2006.2.25 - 2006.2.26

    Language：English   Presentation type：Poster presentation  

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  • 流紋岩メルトへの水の溶解反応の潜熱

    山下茂

    地球惑星関連学会2005年合同大会  2005.5 

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    Event date： 2005.5.22 - 2005.5.25

    Language：Japanese   Presentation type：Poster presentation  

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  • Melting experiments with the control of oxygen fugacity under dry conditions at high pressure: implication for evolution of magmas on the Ontong Java Plateau.

    Sano, T, Yamashita, S

    International Symposium MISASA "Origin, Evolution and Dynamics of the Earth - Present & Future Research - "  2004.3 

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    Event date： 2004.3.5 - 2004.3.6

    Language：English   Presentation type：Poster presentation  

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  • Heat of water dissolution in rhyolite melt.

    Yamashita, S

    International Symposium MISASA "Origin, evolution and dynamics of the Earth - Present & Future Research"  2004.3 

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    Event date： 2004.3.5 - 2004.3.6

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  • Water speciation in sodium silicate melts: Constraints from high temperature IR spectroscopy.

    Yamashita, S, Behrens, H, Holtz, F

    13th Goldschimdt Conference  2003.9 

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    Event date： 2003.9.7 - 2003.9.12

    Language：English   Presentation type：Oral presentation (general)  

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  • 岩石溶融実験による超巨大玄武岩火山（オントンジャワ海台）のマグマ分化作用の研究

    佐野貴司, 山下茂

    日本火山学会2002年秋季大会  2002.10 

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    Event date： 2002.10.22 - 2002.10.24

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • Water speciation in basaltic melts determined by high-temperature infrared spectroscopy

    Yamashita, S

    International symposium on experimental mineralogy, petrology and geochemistry  2002.3 

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    Event date： 2002.3.24 - 2002.3.27

    Language：English   Presentation type：Poster presentation  

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  • Water speciation in basaltic melts: Constraints from water solubility measurements.

    Yamashita, S

    International Symposium Transport of Materials in the Dynamic Earth  2001.10 

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    Event date： 2001.10.2 - 2001.10.5

    Language：English   Presentation type：Poster presentation  

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  • Heat of solution of water in rhyolite melt: Constraints from water solubility measurements.

    Yamashita, S

    American Geophysical Union Spring Meeting 2000  2000.6 

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    Event date： 2000.5.31 - 2000.6.4

    Language：English   Presentation type：Poster presentation  

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  • Experimental study of the effect of temperature on water solubility in rhyolite melt.

    Yamashita, S

    ALFRED-WEGENER CONFERENCE, Processes and Censequences of Deep Subduction  1999.9 

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    Event date： 1999.9.5 - 1999.9.11

    Language：English   Presentation type：Poster presentation  

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  • 流紋岩メルトへの水の溶解度の温度依存性

    山下茂

    地球惑星科学関連学会1998年合同大会  1998.5 

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    Event date： 1998.5.26 - 1998.5.29

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • Experimental determination of water solubility in rhyolite melt at low pressures and 850 to 1200℃

    Yamashita, S

    American Geophysical Union Fall Meeting 1997  1997.12 

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    Event date： 1997.12.8 - 1997.12.12

    Language：English   Presentation type：Poster presentation  

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  • Production of arc basalt magmas: an insight from temporal change in major element compositions of the NE Japan arc basalts

    Yamashita, S

    Misasa Seminar on Evolutionary Processes of Earth and Planetary Materials  1996.6 

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    Event date： 1996.6

    Language：English   Presentation type：Oral presentation (general)  

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  • 顕微赤外分光分析による玄武岩ガラス中の水の定量

    山下茂, 北村俊博, 日下部実

    地球惑星科学関連学会1996年合同大会  1996.3 

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    Event date： 1996.3.26 - 1996.3.29

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  • 比較的低い圧力領域における玄武岩メルトへの水の溶解度

    1996.3 

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    Event date： 1996.3.22 - 1996.3.29

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • Spatial variation in magmatic processes at the Rodriguez triple junction in the Indian Ocean

    Yamashita, S, Fujii, T, Hirose, K

    American Geophysical Union Fall Meeting 1994  1994.12 

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    Event date： 1994.12.5 - 1994.12.9

    Language：English   Presentation type：Poster presentation  

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  • インド洋ロドリゲス三重点周辺の海嶺軸における玄武岩高密度サンプリング

    藤井敏嗣, 山下茂, 石井輝明, 田結床良昭, Langmuir, C.H, 中田節也, 松本哲志, 原田靖, 高橋成実, 広瀬敬

    地球惑星科学関連学会1994年合同大会  1994.3 

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    Event date： 1994.3.20 - 1994.3.23

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • 富士山1707年噴出物の含水量と水素同位体比からみたマグマの脱ガス過程、地球惑星科学関連学会合同大会

    北村俊博, 日下部実, 山下茂, 佐藤博明

    地球惑星科学関連学会1994年合同大会  1994.3 

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    Event date： 1994.3.20 - 1994.3.23

    Language：Japanese   Presentation type：Poster presentation  

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  • Geochemical evolution of mantle wedge during Japan Sea opening I: Contribution from isotope geochemistry

    Nohda, S, Tatsumi, Y. Yamashita, S, Fujii, T

    American Geophysical Union Fall Meeting 1991  1991.12 

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    Event date： 1991.12.9 - 1991.12.13

    Language：English   Presentation type：Poster presentation  

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  • Geochemical evolution of mantle wedge during Japan Sea opening II: Contribution from experimental petrology

    Yamashita, S, Fujii, T, Tatsumi, Y, Nohda, S

    American Geophysical Union Fall Meeting 1991  1991.12 

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    Event date： 1991.12.9 - 1991.12.13

    Language：English   Presentation type：Poster presentation  

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  • Constraints on the formation period of the Japan Sea based on 40Ar-39Ar ages of ODP Leg127/128 samples

    Kaneoka, I, Takigami, Y, Takaoka, N, Yamashita, S, Tamaki, K

    地球惑星科学関連学会1991年合同大会  1991.4 

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    Event date： 1991.4.2 - 1991.4.5

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • 本海より掘削された玄武岩試料のSr、Nd同位体比—日本海の形成とマントルの進化

    能田成, 巽好幸, 山下茂, 藤井敏嗣

    球惑星科学関連学会1991年合同大会  1991.4 

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    Event date： 1991.4.2 - 1991.4.5

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • ODP Leg127で掘削された日本海の音響基盤を構成する玄武岩類〜記載岩石学的特徴

    山下茂, Allan, J., Stewart, K., Thy, P., Leg 127 shipboard scientific party

    地球惑星科学関連学会1990年合同大会  1990.4 

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    Event date： 1990.4.5 - 1990.4.8

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • ODP Leg127で掘削された日本海の音響基盤を構成する玄武岩類〜初生高アルミナ玄武岩質マグマの存在？

    山下茂, Leg 127 shipboard scientific party

    地球惑星科学関連学会1990年合同大会  1990.4 

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    Event date： 1990.4.5 - 1990.4.8

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • 日本海・大和海盆の中期中新世火成活動—大和海盆の下には何があるか？

    山下茂

    日本火山学会1989年春季大会  1989.4 

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    Event date： 1989.4.6 - 1989.4.8

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • 背弧海盆拡大時における火成活動（予察）—日本海・大和海盆の例—

    山下茂

    日本火山学会1988年秋季大会  1988.11 

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    Event date： 1988.11.29 - 1988.12.1

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • 大和海山列の中新世火山岩類の岩石学

    山下茂

    日本火山学会1988年春季大会  1988.7 

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    Event date： 1988.7.16 - 1988.7.18

    Language：Japanese   Presentation type：Oral presentation (general)  

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Research Projects

  • Experimental study of water solubility in andesitic magmas

    Grant number：20K04130  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)

    Shigeru Yamashita

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    Authorship：Principal investigator 

    Grant amount：\3510000 （ Direct expense: \2700000 、 Indirect expense：\810000 ）

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  • Thermodynamic model for volumetric property of hydrous magmas

    Grant number：17K05707  2017.04 - 2020.03

    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)

    Yamashita Shigeru

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    Authorship：Principal investigator 

    Grant amount：\4160000 （ Direct expense: \3200000 、 Indirect expense：\960000 ）

    The speciation of water in an albitic melt was studied in-situ at high pressure and high temperature using micro FTIR-Raman spectroscopy. The water speciation in the hydrous melt was found to be independent of pressure. This indicates that the standard volume change of the water speciation equilibrium is negligibly small, and hence the volumetric property of hydrous melts is independent of water speciation.

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  • 顕微FTIR反射分光法の応用と高度化：含水量データ10倍増計画

    2014.04 - 2015.03

    東京大学地震研究所  特定共同研究(B) 

    安田敦、山下茂ほか

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    Authorship：Coinvestigator(s) 

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  • In situ observation of magma at upper mantle conditions

    Grant number：24540514  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)

    YAMASHITA Shigeru, CHERTKOVA Nadezda

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    Authorship：Principal investigator 

    Grant amount：\4940000 （ Direct expense: \3800000 、 Indirect expense：\1140000 ）

    Feasibility of in situ observation of magmatic substance was assessed at high pressure and high temperature using an externally heated optical anvil cell. Moissanite was tested as possible high-temperature resistant anvil but no advantage of the moissanite to the regular diamond anvil was found under the controlled reduction-oxidation state near upper mantle conditions. In situ observation of an upper mantle magma analogue was performed using the regular diamond anvil, and the water speciation equilibrium in the melt state was successfully determined as function of pressure and temperature.

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  • In-situ spectroscopic observation of magma and water fluid at high temperature and high pressure

    Grant number：21340161  2009.04 - 2012.03

    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)

    YAMASHITA Shigeru, KANZAKI Masami

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    Authorship：Principal investigator 

    Grant amount：\17810000 （ Direct expense: \13700000 、 Indirect expense：\4110000 ）

    Speciation reaction equilibria in silicate melts and multi-component fluids were investigated in-situ at high temperature and high pressure using an externally heated diamond anvil cell. FTIR/Raman spectroscopy was used as a probe. The spectrometers were modified to have a common optical axis near and in the sample chamber of the cell, which renders quasi-simultaneous FTIR/Raman measurements. This, in combination with a newly established C^<13> diamond Raman pressure scale, provides a new development of in-situ spectroscopic study of magma-fluid systems.

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  • In situ observation of silicate melts and fluids at high temperature and high pressure

    2009.01 - 2009.04

    Visiting Scientist 

    Shigeru Yamashita, Bjorn Mysen

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    Authorship：Principal investigator 

    平成21年1月8日〜平成21年4月8日のあいだ，米国カーネギー研究機構地球物理学研究所（Geophysical Laboratory, Carnegie Institution of Washington）にvisiting scientistとして滞在し， 同研究所のBjorn Mysenとともに実験／研究を行った．特に，初期地球に相当する酸化還元状態におけるN-O-H流体のケイ酸塩メルトへの溶解反応を，高温高圧その場分光観察によってはじめて直接に明らかにすることができた．これは，マグマオーシャンからの脱ガスと初期地球大気の形成，さらには有機物の前駆物質の生成を考えるうえで重要な成果である．

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  • マグマ再現実験における酸化還元状態制御法の検討（その2）

    2008.04 - 2009.03

    東京大学地震研究所  一般共同研究 

    山下茂

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    Authorship：Principal investigator 

    Grant amount：\470000

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  • マグマ再現実験における酸化還元状態制御法の検討

    2007.04 - 2008.03

    東京大学地震研究所  一般共同研究 

    山下茂

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    Authorship：Principal investigator 

    Grant amount：\417000

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  • ケイ酸塩ガラス中の溶存水種の顕微赤外分光分析法の確立

    2005.04 - 2006.03

    東京大学地震研究所  一般共同研究 

    山下茂

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    Authorship：Principal investigator 

    Grant amount：\312000

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  • Thermodynamic properties of water in silicate melts

    2001.12 - 2003.02

    Alexander von Humboldt Stiftung  Alexander von Humboldt Foundation Research Fellow 

    Shigeru Yamashita

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    Authorship：Principal investigator 

    Grant amount：\3220000 （ Direct expense: \3220000 ）

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  • In situ spectroscopic study of the thermodynamic properties of water-bearing magmas

    Grant number：11640480  1999.04 - 2001.03

    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)

    YAMASHITA Shigeru

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    Authorship：Principal investigator 

    Grant amount：\3500000 （ Direct expense: \3500000 ）

    The goal of this research was to quantify the thermodynamic properties of water dissolved in silicate melts. Water is a major volatile component dissolved in magma at depth, and is capable of nearly complete exsolution from the melt (but being sustained in the melt as vapor bubbles) when the magma rises to near the surface. This causes a progressive increase of the volume per unit mass of the rising magma and a modification of the cooling path. Knowledge of the thermodynamic properties of water in silicate melts is critical for modeling these effects, and thus fundamental for understanding the dynamics of magma migration and eruption. Two major advances in the quantification of the thermodynamic properties of water in silicate melts have been achieved through this research: (1) High temperature infrared absorption peaks due to OH group and H2O molecule were measured in two basalt glasses (one containing 1.3 wt% water, one containing 2.9 wt% water; the anhydrous composition remains unchanged) as a function of temperature between 〜 25℃ and 575℃. The concentrations of OH group and H2O molecule were determined using the room-temperature calibrations of the molar absorption coefficients. The results show that both OH group and H2O molecule are equilibrium species in the melts, which is consistent with the idea that water is incorporated in a silicate melt through homogeneous reaction H2O molecule + O = 2OH. The product is favored by increase of temperature above the glass transition, and the homogeneous reaction equilibria in these two melts show a good agreement with each other; an equation 1n K = -4070(±470)/T + 3.68(±0.60) reproduces both. The 1n K values obtained in the melts are not distinguishable from those obtained by previous studies in rhyolitic melts within experimental uncertainty. This suggests that there is little influence of composition on the calorimetric properties of the homogeneous reaction equilibria in natural magmatic melts. (2) Heat of solution of water in rhyolite melts was thermodynamically modeled, on the basis of the temperature dependence of water solubility in the melts obtained from infrared spectroscopy of the quenched glasses. In the model developed here, water was assumed to be dissoleved through a coupled reaction H2O molecule melt + O melt = 2OH melt (homogeneous reaction) and H2O vapor = H2O molecule melt (heterogeneous reaction), and ideal mixing of these melt components was assumed. A non-linear multiple regression to the solubility dataset converged upon ΔH° homo (P, T) = 25.8±11.8 kJ, ΔS° homo (P, T) = 6.0±8.7 J/K, and, ΔH° hetero (1bar, T) = -25.3±4.8 kJ/mol. From these optimum values, the following interpretations can be made: The heat of solution is approximately zero at 0.1 MPa, and increases with pressure below 〜 20 MPa, where the absolute value of the heat is negative. At pressures between 〜 20 MPa and 100 MPa, the heat of solution roughly levels out (〜 -7±6 kJ/mol at 850℃) as a result of the balance of the exothermic heterogeneous reaction and endothermic homogeneous reaction. Although error of estimation is large, the present results suggest that at pressures of 10 to 100 MPa (the pressure range important to closed system magma bubbling), the calorimetric effect of bubbling causes a temperature drop of only <10℃.

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Class subject in charge

  • Guidance in Planetary Spectroscopy （2023academic year） Late  - その他

  • Introduction to Earth and Planetary Materials Science （2023academic year） Prophase  - 月3～4

  • Experimental magmalogy （2023academic year） Prophase  - 水2～3

  • Experimental Magmalogy （2023academic year） Prophase  - その他

  • Seminar on Experimental Planetary Physics （2023academic year） Other  - その他

  • Seminar on Experimental Planetary Physics （2023academic year） Year-round  - その他

  • Guidance in Experimental Planetary Physics 1 （2023academic year） Prophase  - その他

  • Guidance in Experimental Planetary Physics 2 （2023academic year） Late  - その他

  • Guidance in Experimental Planetary Physics 3 （2023academic year） Late  - その他

  • Advanced Research in Experimental Planetary Physics （2023academic year） Year-round  - その他

  • Advanced Study in Experimental Planetary Physics （2023academic year） Other  - その他

  • Advanced Study in Experimental Planetary Physics （2023academic year） Year-round  - その他

  • Advanced Study （2023academic year） Other  - その他

  • Experimental magmalogy （2022academic year） Prophase  - 水2～3

  • Seminar on Experimental Planetary Physics （2022academic year） Year-round  - その他

  • Guidance in Experimental Planetary Physics 1 （2022academic year） Prophase  - その他

  • Guidance in Experimental Planetary Physics 2 （2022academic year） Late  - その他

  • Guidance in Experimental Planetary Physics 3 （2022academic year） Late  - その他

  • Advanced Study in Experimental Planetary Physics （2022academic year） Year-round  - その他

  • Experimental magmalogy （2021academic year） Prophase  - 水2～3

  • Seminar on Experimental Planetary Physics （2021academic year） Year-round  - その他

  • Guidance in Experimental Planetary Physics 1 （2021academic year） Prophase  - その他

  • Guidance in Experimental Planetary Physics 2 （2021academic year） Late  - その他

  • Guidance in Experimental Planetary Physics 3 （2021academic year） Late  - その他

  • Advanced Study in Experimental Planetary Physics （2021academic year） Year-round  - その他

  • Experimental magmalogy （2020academic year） Prophase  - 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]

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Media Coverage

  • New insight into the origin of water on the earth Internet

    2020.5

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  • 月の内部に予想の１００倍の水か アポロ計画で採取の石を分析 Newspaper, magazine

    共同通信  産經新聞  2010.6.15

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    Author：Other 

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Academic Activities

  • Detection of magmatism beneath the Ontong Java Plateau last for ~100 million years

    Role(s)：Planning/Implementing academic research

    Japan Agency for Marine-Earth Science and Technology  2016

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    Type：Academic research 

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  • Geological and geophysical study of the Rodviguez Triple Junction, Indian Ocean

    Role(s)：Planning/Implementing academic research

    Ocean Research Institute, University of Tokyo  1993

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    Type：Academic research 

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  • Geological and petrological study of Deccan Flood Basalt Province

    Role(s)：Planning/Implementing academic research

    Earthquake Research Institute, University of Tokyo  1993

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    Type：Academic research 

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  • Ocean Drilling Program (ODP) Leg127

    Role(s)：Planning/Implementing academic research

    Ocean Drilling Program (ODP)  1989

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    Type：Academic research 

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