2023/01/14 更新

写真a

タナカ リョウジ
田中 亮吏
TANAKA Ryoji
所属
惑星物質研究所 教授
職名
教授
外部リンク

学位

  • 博士(理学) ( 北海道大学 )

研究キーワード

  • Cosmochemistry

  • Geochemistry

  • radiogenic isotope

  • stable isotope

  • 地球宇宙化学

  • 放射性同位体

  • 安定同位体

研究分野

  • 自然科学一般 / 固体地球科学

  • 自然科学一般 / 宇宙惑星科学

学歴

  • 北海道大学    

    - 1997年

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    国名: 日本国

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  • 北海道大学   Graduate School, Division of Natural Science   Department of Earth and Planetary Science

    - 1997年

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  • 北海道大学   Faculty of Engineering   Department of Resource Development Engineering

    - 1992年

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  • 北海道大学   School of Engineering   Department of Mineral Resources Engineering

    - 1992年

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    国名: 日本国

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経歴

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

    2018年 - 現在

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  • - 岡山大学惑星物質研究所 教授

    2018年 - 現在

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  • 岡山大学   The Institute for Planetary Materials

    2009年 - 2018年

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

    2009年 - 2018年

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  • 岡山大学地球物質科学研究センター 助教

    2007年 - 2008年

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

    2007年 - 2008年

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  • 岡山大学地球物質科学研究センター 助手

    2006年 - 2007年

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

    2006年 - 2007年

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  • 岡山大学地球物質科学研究センター 職員(技術系)

    2005年 - 2006年

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  • Technical Staff,Institute for Study of the Earth's Interior,Okayama University

    2005年 - 2006年

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  • 岡山大学固体地球研究センター 職員(技術系)

    2000年 - 2005年

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  • Technical Staff,Institute for Study of the Earth's Interior,Okayama University

    2000年 - 2005年

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  • 岡山大学固体地球研究センター 大学等非常勤研究員

    1997年 - 2000年

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  • Part-time researcher for university or other academic organization,Institute for Study of the Earth's Interior,Okayama University

    1997年 - 2000年

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  • 東京大学   The University Museum

    1997年

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  • Part-time researcher for university or other academic organization,University Museum, University of Tokyo

    1997年

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▼全件表示

所属学協会

 

論文

  • Malotas (b), a new eucrite from an old fall 査読

    Marcela E. Saavedra, Julia Roszjar, My E. I. Riebe, María E. Varela, Shuying Yang, Munir Humayun, Ryoji Tanaka, H. Busemann

    Meteoritics & Planetary Science   57 ( 11 )   2081 - 2101   2022年11月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Wiley  

    DOI: 10.1111/maps.13913

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    その他リンク: https://onlinelibrary.wiley.com/doi/full-xml/10.1111/maps.13913

  • A rapid method of simultaneous chromatographic purification of Li and Mg for isotopic analyses using MC-ICP-MS 査読

    Wei Zhang, Ryoji Tanaka, Hiroshi Kitagawa, Madeleine Bohlin, Eizo Nakamura

    International Journal of Mass Spectrometry   480   116893 - 116893   2022年10月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    DOI: 10.1016/j.ijms.2022.116893

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  • On the origin and evolution of the asteroid Ryugu: A comprehensive geochemical perspective 査読

    Eizo NAKAMURA, Katsura KOBAYASHI, Ryoji TANAKA, Tak KUNIHIRO, Hiroshi KITAGAWA, Christian POTISZIL, Tsutomu OTA, Chie SAKAGUCHI, Masahiro YAMANAKA, Dilan M. RATNAYAKE, Havishk TRIPATHI, Rahul KUMAR, Maya-Liliana AVRAMESCU, Hidehisa TSUCHIDA, Yusuke YACHI, Hitoshi MIURA, Masanao ABE, Ryota FUKAI, Shizuho FURUYA, Kentaro HATAKEDA, Tasuku HAYASHI, Yuya HITOMI, Kazuya KUMAGAI, Akiko MIYAZAKI, Aiko NAKATO, Masahiro NISHIMURA, Tatsuaki OKADA, Hiromichi SOEJIMA, Seiji SUGITA, Ayako SUZUKI, Tomohiro USUI, Toru YADA, Daiki YAMAMOTO, Kasumi YOGATA, Miwa YOSHITAKE, Masahiko ARAKAWA, Atsushi FUJII, Masahiko HAYAKAWA, Naoyuki HIRATA, Naru HIRATA, Rie HONDA, Chikatoshi HONDA, Satoshi HOSODA, Yu-ichi IIJIMA, Hitoshi IKEDA, Masateru ISHIGURO, Yoshiaki ISHIHARA, Takahiro IWATA, Kosuke KAWAHARA, Shota KIKUCHI, Kohei KITAZATO, Koji MATSUMOTO, Moe MATSUOKA, Tatsuhiro MICHIKAMI, Yuya MIMASU, Akira MIURA, Tomokatsu MOROTA, Satoru NAKAZAWA, Noriyuki NAMIKI, Hirotomo NODA, Rina NOGUCHI, Naoko OGAWA, Kazunori OGAWA, Chisato OKAMOTO, Go ONO, Masanobu OZAKI, Takanao SAIKI, Naoya SAKATANI, Hirotaka SAWADA, Hiroki SENSHU, Yuri SHIMAKI, Kei SHIRAI, Yuto TAKEI, Hiroshi TAKEUCHI, Satoshi TANAKA, Eri TATSUMI, Fuyuto TERUI, Ryudo TSUKIZAKI, Koji WADA, Manabu YAMADA, Tetsuya YAMADA, Yukio YAMAMOTO, Hajime YANO, Yasuhiro YOKOTA, Keisuke YOSHIHARA, Makoto YOSHIKAWA, Kent YOSHIKAWA, Masaki FUJIMOTO, Sei-ichiro WATANABE, Yuichi TSUDA

    Proceedings of the Japan Academy, Series B   98 ( 6 )   227 - 282   2022年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Japan Academy  

    DOI: 10.2183/pjab.98.015

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  • The ice-organic-silicate contents of small solar system bodies: indicators for a comet to asteroid evolutionary pathway 査読

    Havishk Tripathi, Christian Potiszil, Ryoji Tanaka, Eizo Nakamura

    Monthly Notices of the Royal Astronomical Society   2022年4月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Oxford University Press (OUP)  

    ABSTRACT

    Comets and asteroids have traditionally been separated categories, but main belt comets skew this view, portraying a possible intermediate stage between these two endmembers. Investigating the relationship between these bodies can improve our understanding of the formation and evolution of the Solar System and help to identify potentially interesting parent bodies from within our solar system, for future sample return missions. Furthermore, elucidating the ice-organic-silicate ratios of potential meteorite parent bodies can help to explain the observed isotopic ratios and petrography of meteorite samples. While the ice-organic-silicate ratios of particular bodies have been estimated, there has been no study undertaken which compares different types of bodies in terms of their ice-organic-silicate ratios. Therefore, this study presents a geophysical-chemical mass balance model, to estimate the ice-organic-silicate ratios of comets, main belt comets and asteroids. The results drawn from the model form a diagonal trend upon an ice-organic-silicate ternary diagram, in which comets and main belt comets plot together at generally higher ice contents, with asteroids typically plotting at lower ice contents. However, an overlap between all three body types is observed and supports the scenario in which comets, main belt comets and asteroids are genetically linked.

    DOI: 10.1093/mnras/stac1068

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  • Nitrogenous Altered Volcanic Glasses as Targets for Mars Sample Return: Examples From Antarctica and Iceland 査読

    M. P. Nikitczuk, G. E. Bebout, T. Ota, T. Kunihiro, J. F. Mustard, R. L. Flemming, R. Tanaka, S. A. Halldórsson, E. Nakamura

    Journal of Geophysical Research: Planets   127 ( 2 )   2022年2月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:American Geophysical Union (AGU)  

    DOI: 10.1029/2021je007052

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    その他リンク: https://onlinelibrary.wiley.com/doi/full-xml/10.1029/2021JE007052

  • Liquid-phase water isotope separation using graphene-oxide membranes 査読

    Karin Ching, Andy Baker, Ryoji Tanaka, Tingwen Zhao, Zhen Su, Rodney S. Ruoff, Chuan Zhao, Xianjue Chen

    Carbon   2022年1月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier {BV}  

    DOI: 10.1016/j.carbon.2021.10.009

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  • Mineralogical Factors Controlling the Ability to Retain 137Cs in Andosols in Japan 査読

    Atsushi Nakao, Shiori Uno, Ryoji Tanaka, Junta Yanai

    Behavior of Radionuclides in the Environment III   365 - 375   2022年

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    掲載種別:論文集(書籍)内論文   出版者・発行元:Springer Singapore  

    DOI: 10.1007/978-981-16-6799-2_16

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  • Novel nickel isolation procedure for a wide range of sample matrices without using dimethylglyoxime for isotope measurements using MC-ICP-MS 査読

    Dilan M. Ratnayake, Ryoji Tanaka, Eizo Nakamura

    Analytica Chimica Acta   1181   338934 - 338934   2021年10月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier {BV}  

    DOI: 10.1016/j.aca.2021.338934

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  • A New Insight Into Seawater-Basalt Exchange Reactions Based on Combined δ18O—Δ′17O—87Sr/86Sr Values of Hydrothermal Fluids From the Axial Seamount Volcano, Pacific Ocean 査読

    Zakharov, D. O, Tanaka, R, Butterfield, D. A, Nakamura, E

    Frontiers in Earth Science   2021年9月

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    掲載種別:研究論文(学術雑誌)  

    <jats:p>The δ<jats:sup>18</jats:sup>O values of submarine vent fluids are controlled by seawater-basalt exchange reactions, temperature of exchange, and to a lesser extent, by phase separation. These variations are translated into the δ<jats:sup>18</jats:sup>O values of submarine hydrothermal fluids between ca. 0 and + 4‰, a range defined by pristine seawater and equilibrium with basalt. Triple oxygen isotope systematics of submarine fluids remains underexplored. Knowing how δ<jats:sup>17</jats:sup>O and δ<jats:sup>18</jats:sup>O change simultaneously during seawater-basalt reaction has a potential to improve i) our understanding of sub-seafloor processes and ii) the rock-based reconstructions of ancient seawater. In this paper, we introduce the first combined δ<jats:sup>17</jats:sup>O-δ<jats:sup>18</jats:sup>O-<jats:sup>87</jats:sup>Sr/<jats:sup>86</jats:sup>Sr dataset measured in fluids collected from several high-temperature smoker- and anhydrite-type vent sites at the Axial Seamount volcano in the eastern Pacific Ocean. This dataset is supplemented by measurements of major, trace element concentrations and pH indicating that the fluids have reacted extensively with basalt. The salinities of these fluids range between 30 and 110% of seawater indicating that phase separation is an important process, potentially affecting their δ<jats:sup>18</jats:sup>O. The <jats:sup>87</jats:sup>Sr/<jats:sup>86</jats:sup>Sr endmember values range between 0.7033 and 0.7039. The zero-Mg endmember δ<jats:sup>18</jats:sup>O values span from -0.9 to + 0.8‰, accompanied by the Δ′<jats:sup>17</jats:sup>O<jats:sub>0.528</jats:sub> values ranging from around 0 to −0.04‰. However, the trajectory at individual site varies. The endmember values of fluids from focused vents exhibit moderate isotope shifts in δ′<jats:sup>18</jats:sup>O up to +0.8‰, and the shifts in Δ′<jats:sup>17</jats:sup>O are small, about −0.01‰. The diffuse anhydrite-type vent sites produce fluids that are significantly more scattered in δ′<jats:sup>18</jats:sup>O—Δ′<jats:sup>17</jats:sup>O space and cannot be explained by simple isothermal seawater-basalt reactions. To explain the observed variations and to provide constraints on more evolved fluids, we compute triple O isotope compositions of fluids using equilibrium calculations of seawater-basalt reaction, including a non-isothermal reaction that exemplifies complex alteration of oceanic crust. Using a Monte-Carlo simulation of the dual-porosity model, we show a range of possible simultaneous triple O and Sr isotope shifts experienced by seawater upon reaction with basalt. We show the possible variability of fluid values, and the causal effects that would normally be undetected with conventional δ<jats:sup>18</jats:sup>O measurements.</jats:p>

    DOI: 10.3389/feart.2021.691699

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  • Silicon and Oxygen Isotope Evolution of the Inner Solar System 査読

    Ryoji Tanaka, Christian Potiszil, Eizo Nakamura

    The Planetary Science Journal   2021年6月

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    担当区分:筆頭著者, 責任著者   掲載種別:研究論文(学術雑誌)  

    DOI: 10.3847/PSJ/abf490

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  • Distance-dependence from volcano for Asian dust inclusions in Andosols: A key to control soil ability to retain radiocesium 査読

    Atsushi Nakao, Shiori Uno, Junta Yanai, Hideo Kubotera, Ryoji Tanaka, Robert A. Root, Takashi Kosaki

    Geoderma   385   114889 - 114889   2021年3月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    DOI: 10.1016/j.geoderma.2020.114889

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  • Comment on: ‘A simple cryogenic method for efficient measurement of triple oxygen isotopes in silicates’ by Ghoshmaulik et al. (Rapid Commun Mass Spectrom. 2020;34(18):e8833) 査読

    Martin F. Miller, Ryoji Tanaka, Richard C. Greenwood

    Rapid Communications in Mass Spectrometry   34 ( 22 )   2020年11月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Wiley  

    DOI: 10.1002/rcm.8913

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  • The Albedo of Ryugu: Evidence for a High Organic Abundance, as Inferred from the Hayabusa2 Touchdown Maneuver 査読

    Christian Potiszil, Ryoji Tanaka, Katsura Kobayashi, Tak Kunihiro, Eizo Nakamura

    ASTROBIOLOGY   2020年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:MARY ANN LIEBERT, INC  

    The Hayabusa2 mission successfully collected samples from the asteroid Ryugu last year and will return these to Earth in December 2020. It is anticipated that the samples will enable the analysis of terrestrially uncontaminated organic matter and minerals. Such analyses are in turn expected to elucidate the evolution of organic matter through Solar System history, including the origination and processing of biogenically important molecules, which could have been utilized by the first organisms on Earth. In anticipation, studies have made predictions concerning the properties of Ryugu, including its composition. The spectral characteristics of Ryugu, such as albedo, have been employed to relate the asteroid to members of the carbonaceous chondrite group that have been identified on Earth. However, the recent Hayabusa2 touchdown highlights a disparity between the color of surfaces of displaced platy fragments, indicating a brightening trend for the surface exposed to space compared to that facing into the body. Here we present a mass balance calculation with reference to data from the literature, which indicates that Ryugu may contain a significantly higher abundance of organic matter (likely >50%) than the currently most accepted meteorite analogues. A high organic content may result in high levels of extractable organic matter for the second touchdown site, where the spacecraft sampled freshly exposed material. However, high abundances of insoluble aromatic/graphitic rich organic matter may be present in the first touchdown site, which sampled the surface of Ryugu that had been exposed to space. Moreover, we suggest that the potentially high organic abundance and the rubble-pile nature of Ryugu may originate from the capture of rocky debris by a comet nucleus and subsequent water-organic-mineral interactions and sublimation of water ice.

    DOI: 10.1089/ast.2019.2198

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  • Concentration of meteoritic free organic matter by fluid transport and adsorption 査読

    Christian Potiszil, Ryoji Tanaka, Tsutomu Ota, Tak Kunihiro, Katsura Kobayashi, Eizo Nakamura

    Geochemical Perspectives Letters   13   30 - 35   2020年3月

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    掲載種別:研究論文(学術雑誌)  

    Carbonaceous chondrites contain many abiotic organic compounds, some of which are found in life on Earth. Both the mineral and organic matter phases, of these meteorites, have been affected by aqueous alteration processes. Whilst organic matter is known to be associated with phyllosilicate phases, no such relationship has yet been identified for specific organic compound classes. Furthermore, ongoing sample return missions, Hyabusa 2 and OSIRIS-Rex, are set to return potentially organic rich C-type asteroid samples to the Earth. Consequently, strategies to investigate organic-mineral relationships are required. Here we report spatial data for free/soluble organic matter (FOM/SOM) components (akylimidazole and alkylpyridine homologues) and mineral phases. Low and intermediate molecular weight alkylimidazole homologues are more widely distributed than higher molecular weight members, likely due to their affinity for the aqueous phase. On aqueous alteration of anhydrous mineral phases, transported FOM is adsorbed onto the surface or into the interlayers of the resulting phyllosilicates and thus concentrated and protected from oxidising fluids. Therefore, aiding the delivery of biologically relevant molecules to earth, shortly preceding the origin of life.

    DOI: 10.7185/geochemlet.2010

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  • Tourmaline in a Mesoarchean pelagic hydrothermal system: Implications for the habitat of early life 査読

    Tsutomu Ota, Yuhei Aihara, Shoichi Kiyokawa, Ryoji Tanaka, Eizo Nakamura

    Precambrian Research   334   105475 - 105475   2019年11月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    DOI: 10.1016/j.precamres.2019.105475

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  • Triple oxygen isotope systematics as a tracer of fluids in the crust: A study from modern geothermal systems of Iceland 査読

    Zakharov, D, Bindeman, I. N, Tanaka, R, Friðleifsson, G., O, Reed, M. H, Hampton, R. L

    Chemical Geology   2019年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.chemgeo.2019.119312

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  • Transition from plume-driven to plate-driven magmatism in the evolution of the Main Ethiopian Rift 査読

    Journal of Petrology   2019年9月

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    &lt;jats:title&gt;Abstract&lt;/jats:title&gt;<br />
    &lt;jats:p&gt;New K-Ar ages, major and trace element concentrations, and Sr-Nd-Pb isotope data are presented for Oligocene to recent mafic volcanic rocks from the Ethiopian Plateau, the Main Ethiopian Rift (MER), and the Afar depression. Chronological and geochemical data from this study are combined with previously published data sets to reveal secular variations in magmatism throughout the entire Ethiopian volcanic region. The mafic lavas in these regions show variability in terms of silica-saturation (i.e., alkaline and sub-alkaline series) and extent of differentiation (mafic through intermediate to felsic). The P-T conditions of melting, estimated using the least differentiated basalts, reveal a secular decrease in the mantle potential temperature, from when the flood basalt magmas erupted (up to 1550 °C) to the time of the rift-related magmatism (&amp;lt;1500 °C). Variations in the Sr-Nd-Pb isotopic compositions of the mafic lavas can account for the involvement of multiple end-member components. The relative contributions of these end-member components vary in space and time owing to changes in the thermal condition of the asthenosphere and the thickness of the lithosphere. The evolution of the Ethiopian rift is caused by a transition from plume-driven to plate-driven mantle upwelling, although the present-day mantle beneath the MER and the Afar depression is still warmer than normal asthenosphere.&lt;/jats:p&gt;

    DOI: 10.1093/petrology/egz043

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  • Asian dust increases radiocesium retention ability of serpentine soils in Japan. 査読 国際誌

    Nakao A, Tomita M, Wagai R, Tanaka R, Yanai J, Kosaki T

    Journal of environmental radioactivity   204   86 - 94   2019年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.jenvrad.2019.03.028

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  • A Method to Suppress Isobaric and Polyatomic Interferences for Measurements of Highly Siderophile Elements in Desilicified Geological Samples 査読

    Xiaoyu Zhou, Ryoji Tanaka, Masahiro Yamanaka, Chie Sakaguchi, Eizo Nakamura

    Geostandards and Geoanalytical Research   43 ( 4 )   611 - 633   2019年7月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Wiley  

    DOI: 10.1111/ggr.12280

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  • Origin of ocean island basalts in the West African passive margin without mantle plume involvement. 査読

    Belay IG, Tanaka R, Kitagawa H, Kobayashi K, Nakamura E

    Nature Communications   10 ( 1 )   3022   2019年7月

  • Hypervelocity collision and water-rock interaction in space preserved in the Chelyabinsk ordinary chondrite 査読

    Nakamura E, Kunihiro T, Ota T, Sakaguchi C, Tanaka R, Kitagawa H, Kobayashi K, Yamanaka M, Shimaki Y, Bebout GE, Miura H, Yamamoto T, Malkovets V, Grokhovsky V, Koroleva O, Litasov K

    Proceedings of the Japan Academy. Series B, Physical and biological sciences   95 ( 4 )   165 - 177   2019年4月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.2183/pjab.95.013

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  • The origin of the unique achondrite Northwest Africa 6704: Constraints from petrology, chemistry and Re–Os, O and Ti isotope systematics 査読

    Hibiya Y, Archer GJ, Tanaka R, Sanborn ME, Sato Y, Iizuka T, Ozawa K, Walker RJ, Yamaguchi A, Yin QZ, Nakamura T, Irving AJ

    Geochimica et Cosmochimica Acta   245   597 - 627   2019年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.gca.2018.04.031

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  • Circa 1 Ga sub-seafloor hydrothermal alteration imprinted on the Horoman peridotite massif 査読

    Lalindra V. Ranaweera, Tsutomu Ota, Takuya Moriguti, Ryoji Tanaka, Eizo Nakamura

    Scientific Reports   8 ( 1 )   1 - 12   2018年6月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1038/s41598-018-28219-x

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  • Silicate-SiO reaction in a protoplanetary disk recorded by oxygen isotopes in chondrules 査読

    Ryoji Tanaka, Eizo Nakamura

    NATURE ASTRONOMY   1 ( 7 )   1 - 7   2017年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:NATURE PUBLISHING GROUP  

    The formation of planetesimals and planetary embryos during the earliest stages of the solar protoplanetary disk largely determined the composition and structure of the terrestrial planets. Within a few million years of the birth of the Solar System, chondrule formation and the accretion of the parent bodies of differentiated achondrites and the terrestrial planets took place in the inner protoplanetary disk(1,2). Here we show that, for chondrules in unequilibrated enstatite chondrites, high-precision Delta O-17 values (where Delta O-17 is the deviation of the delta O-17 value from a terrestrial silicate fractionation line) vary significantly (ranging from -0.49 to + 0.84%) and fall on an array with a steep slope of 1.27 on a three-oxygen-isotope plot. This array can be explained by the reaction between an olivine-rich chondrule melt and an SiO-rich gas derived from vaporized dust and nebular gas. Our study suggests that a large proportion of the building blocks of planetary embryos formed by successive silicate-gas interaction processes: silicate- H2O followed by silicate-SiO interactions under more oxidized and reduced conditions, respectively, within a few million years of the formation of the Solar System.

    DOI: 10.1038/s41550-017-0137

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  • The oxygen isotope composition of San Carlos olivine on the VSMOW2-SLAP2 scale 査読

    Andreas Pack, Ryoji Tanaka, Markus Hering, Sukanya Sengupta, Stefan Peters, Eizo Nakamura

    RAPID COMMUNICATIONS IN MASS SPECTROMETRY   30 ( 13 )   1495 - 1504   2016年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-BLACKWELL  

    RATIONALE: The precise determination of Delta'O-17 values in terrestrial material is becoming increasingly important to understand the mass-dependent fractionation processes that cause variations in oxygen isotope ratios. San Carlos olivine is widely used as the reference material for oxygen isotope measurements of terrestrial and extraterrestrial materials. We report new Delta'O-17 values for San Carlos olivine that were independently determined in two different laboratories (Geoscience Center [GZG], University of Gottingen) and Institute for Study of the Earth's Interior [ISEI], Okayama University, Misasa) in direct comparison with VSMOW2 and SLAP2 water standards.
    METHODS: The delta O-17 and delta O-18 values of VSMOW2, SLAP2, GISP, and San Carlos olivine were determined relative to reference gas. In both laboratories, water and San Carlos olivine samples were prepared by BrF5 fluorination. In both laboratories, the O-2 released from water and olivine samples was passed through the same purification system and measured using the same mass spectrometer relative to the same reference gas.
    RESULTS: In both laboratories, the delta O-17(VSMOW2) and delta O-18 (VSMOW2) scales were slightly compressed with respect to the recommended composition of VSMOW2 and SLAP2. The new Delta'O-17(0.528) value (calculated from the VSMOW2-SLAP2 scaled 6 values) of San Carlos olivine from GZG was -36 +/- 9 ppm and, from ISEI, a value of -40 +/- 7 ppm (1(7 standard deviation) was determined. These values are similar to 50 ppm higher than previously reported from the same laboratories. Possible causes for the observed discrepancies are discussed.
    CONCLUSIONS: The results of this study in comparison with previous data from the same laboratories demonstrated that for high accuracy determination of Delta'O-17 values: (i) calibration of the reference gas relative to O-2 released from primary standards (VSMOW2, SLAP2) in the same laboratory is highly recommended, (ii) non-linearity of the mass spectrometer may not only affect delta O-17 and delta O-18 values but also Delta'O-17 values, and (iii) the VSMOW2-SLAP2 scaling should also be applied to analyses of rocks and minerals. Studies that are concerned with small differences in Delta'O-17 at similar delta O-18 values, however, are not affected by non-linearity of the mass spectrometer. Copyright (C) 2016 John Wiley & Sons, Ltd.

    DOI: 10.1002/rcm.7582

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  • Aeolian-Dust-Derived Micaceous Minerals Control Radiocesium Retention in Andosols in Japan 査読

    Atsushi Nakao, Aya Nakao, Ryoji Tanaka, Sho Ogasawara, Junta Yanai

    SOIL SCIENCE SOCIETY OF AMERICA JOURNAL   79 ( 6 )   1590 - 1600   2015年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOIL SCI SOC AMER  

    Factors controlling the abilities of Allophanic Andosols (representative of Japanese volcanic ash soils) to retain radiocesium (RCs) were assessed. The hypothesis was that retention is largely controlled by traces of micaceous minerals deposited as components of aeolian dust. The radiocesium interception potentials (RIPs), mica K contents were determined in the 2- to 20- and &lt;2.0-mm particle fractions of 23 soil samples from agricultural fields in areas representative of Japanese Allophanic Andosols. Quartz contents were determined in the 2- to 20-mm particle fractions of the same soil samples. The oxygen isotope ratio (delta O-18) in the quartz isolated from each 2- to 20-mm particle fraction was determined to identify the origin of the quartz in each soil sample. The mean RIP for the 2- to 20- and &lt;2-mm particles was 1.7 +/- 0.8 and 2.6 +/- 1.3 mol kg(-1), respectively, and the mica K contents were 3.2 +/- 1.3 and 3.4 +/- 1.7 g kg(-1), respectively, corresponding to micaceous mineral contents of &lt;5% by mass in each size fraction. In spite of their rather low values, the RIPs and mica K contents in each fraction positively correlated (p &lt; 0.01), indicating that the abilities of the soils to retain RCs were mainly controlled by the micaceous mineral contents. The mica K content was proportional to the quartz content in the &lt;20-mm particles, and the mean delta O-18 in the quartz was + 14.8%, similar to those in fine quartz in Chinese loess. These results strongly indicate that the abilities of Allophanic Andosols to retain RCs are largely controlled by micaceous minerals probably originating in aeolian dust.

    DOI: 10.2136/sssaj2015.05.0173

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  • Evaluation of the applicability of acid leaching for the U-238-Th-230 internal isochron method 査読

    Ryoji Tanaka, Tetsuya Yokoyama, Hiroshi Kitagawa, Demissie Bizuneh Tesfaye, Eizo Nakamura

    CHEMICAL GEOLOGY   396   255 - 264   2015年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    The U-238-Th-230 internal isochron method has great potential for determining eruption ages of young volcanic materials if the separated groundmass phases have a sufficiently wide range of U/Th ratios. We examined the fractionation behavior of U and Th in aged (i.e., &gt;0.5 Ma) basaltic samples by 6 M hydrochloric acid leaching to evaluate the applicability of acid-leaching treatment for the U-238-Th-230 internal isochron method. Acid leaching of aged basaltic rocks in U-238-U-234-Th-230 secular equilibrium at the bulk-rock scale results in Th-230-U-238 and U-234-U-238 radioactive disequilibria for both leachates and residues. These radioactive disequilibria can be explained by redistribution of Th-234 (parent of U-234) and Th-230 between acid-soluble and acid-resistant phases due to alpha-recoil. The number of Th-230 atoms redistributed by alpha-recoil can be calculated by using a mass conservation equation for U-234 atoms and by the relative amount of recoiled Th-230 and Th-234, the latter proportional to the kinetic energy of the recoiled nuclide. When the fraction of daughter nuclide U-234 remaining in either the residue or leachate, after alpha-recoil redistribution of U-238, is large enough (&gt;95%), the corrected (Th-230/U-238) values of leachate and residue show radioactive equilibria. This result demonstrates that preferential fractionation between U and Th does not occur during acid leaching for basaltic samples if there is no selective etching of the alpha-recoil track. This study implies that acid-leaching can be used in conjunction with the U-238-Th-230 internal isochron method for dating young volcanic rocks by evaluating the degree of the alpha-recoil redistribution of U-234. (C) 2015 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.chemgeo.2014.12.025

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  • Oxygen isotopes in Indian Plate eclogites (Kaghan Valley, Pakistan): Negative δ18O values from a high latitude protolith reset by Himalayan metamorphism 査読

    Rehman, Ur. H, Tanaka, R, O’Brien, J.P, Kobayashi, K, Tsujimori, T, Nakamura, E, Yamamoto, H, Khan, T, Kaneko, Y

    Lithos   208   471 - 483   2014年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.lithos.2014.09.007

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  • Two new eucrite breccias from Northwest Africa 査読

    Sheryl A. Singerling, Aubrey L. Modi, Blake McFerrin, Emily A. Worsham, Harry Y. McSween, Douglas Rumble, Ryoji Tanaka, Lawrence A. Taylor

    METEORITICS & PLANETARY SCIENCE   48 ( 2 )   E1 - E9   2013年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-BLACKWELL  

    This work describes two newly discovered eucrite breccias: three presumably paired meteorites, all named Northwest Africa (NWA) 6105, and NWA 6106. For each meteorite, major- and minor-element compositions of minerals were determined using the electron microprobe. Pyroxene Fe-Mn co-variations and bulk-rock oxygen isotope compositions confirm their classification as eucrites. Variations in mineral compositions and textures are attributed to differences in clast types present (i.e., basaltic or cumulate eucrite). The pyroxene compositions support the hypothesis that samples NWA 6105,1; 6105,2; and 6105,3 are paired polymict eucritic breccias, whereas sample NWA 6106 is a monomict basaltic eucritic breccia. Two-pyroxene geothermometry yields temperatures too low for igneous crystallization. The variation in temperatures among samples suggests that metamorphism occurred prior to brecciation.

    DOI: 10.1111/maps.12025

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  • Determination of 17O-excess of terrestrial silicate/oxide minerals with respect to Vienna Standard Mean Ocean Water (VSMOW) 査読

    Ryoji Tanaka, Eizo Nakamura

    RAPID COMMUNICATIONS IN MASS SPECTROMETRY   27 ( 2 )   285 - 297   2013年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-BLACKWELL  

    RATIONALE Oxygen triple isotope compositions give key information for understanding physical processes during isotopic fractionation between the geo-, hydro-, bio-, and atmosphere. For detailed discussion of these topics, it is necessary to determine precise 17O-excess values of terrestrial silicate/oxide minerals with respect to Vienna Standard Mean Ocean Water (VSMOW). METHODS Water was fluorinated in an electrically heated Ni-metal tube into which water and BrF5 were loaded for the quantitative extraction of oxygen. Silicate/oxide minerals were fluorinated by heating with a CO2 laser in an atmosphere of BrF5. The extracted oxygen was purified and isotope ratios of the oxygen triple isotope compositions were determined using a Finnigan MAT253 isotope ratio mass spectrometer. RESULTS The oxygen triple isotope compositions of meteoric water and terrestrial silicate/oxide minerals fall on statistically distinguishable fractionation lines, defined as [ln(d17O?+?1)?=??ln(d18O?+?1)?+??], where ? and ? correspond to the slope and intercept, respectively. The fractionation line for meteoric water has ??=?0.5285?+/-?0.0005 and ??=?0.03?+/-?0.02 parts per thousand and for terrestrial silicate/oxide minerals has ??=?0.5270?+/-?0.0005 and ??=?0.070?+/-?0.005 parts per thousand, at the 95% confidence limit. CONCLUSIONS All the analyzed terrestrial silicate/oxide minerals including internationally accepted reference materials (NBS-28, UWG-2, and San Carlos olivine) have a negative 17O-excess with respect to VSMOW. We propose that it is necessary to specify if the determined d17O values of terrestrial and extraterrestrial samples are expressed as the difference from VSMOW or the terrestrial silicate mineral-corrected value. Copyright (c) 2012 John Wiley & Sons, Ltd.

    DOI: 10.1002/rcm.6453

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  • Inherited Pb isotopic records in olivine antecryst-hosted melt inclusions from Hawaiian lavas 査読

    Patrick Asamoah Sakyi, Ryoji Tanaka, Katsura Kobayashi, Eizo Nakamura

    GEOCHIMICA ET COSMOCHIMICA ACTA   95   169 - 195   2012年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    Dislocation textures of olivine grains and Pb isotopic compositions (Pb-207/Pb-206 and Pb-208/Pb-206) of olivine-hosted melt inclusions in basaltic lavas from three Hawaiian volcanoes (Kilauea, Mauna Loa, and Koolau) were examined. More than 70% of the blocky olivine grains in the studied samples have a regular-shaped dislocation texture with their dislocation densities exceeding 10(6) cm(-2), and can be considered as deformed olivine. The size distribution of blocky olivine grains shows that more than 99% of blocky olivines coarser than 1.2 mm are identified as deformed olivine. These deformed olivine grains are identified as antecrysts, which originally crystallized from previous stages of magmatism in the same shield, followed by plastic deformation prior to entrainment in the erupted host magmas. This study revealed that entrainment of mantle-derived crystallization products by younger batches of magma is an important part of the evolution of magnesium-rich Hawaiian magma. Lead isotopic compositions of melt inclusions hosted in the olivine antecrysts provide information of the evolutionary history of Hawaiian volcanoes which could not have been accessed if only whole rock analyses were carried out. Antecryst-hosted melt inclusions in Kilauea and Koolau lavas demonstrate that the source components in the melting region changed during shield formation. In particular, evidence of interaction of plume-derived melts and upper mantle was observed in the earliest stage of Koolau magmatism. (C) 2012 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.gca.2012.07.025

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  • PETROLOGIC, ELEMENTAL AND OXYGEN ISOTOPIC CHARACTERIZATION OF HIGHLY ENRICHED MAFIC SHERGOTTITE NORTHWEST AFRICA 7257 査読

    A. J. Irving, S. M. Kuehner, G. Chen, C. D. K. Herd, R. Tanaka, D. A. Gregory

    METEORITICS & PLANETARY SCIENCE   47   A209 - A209   2012年7月

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    記述言語:英語   出版者・発行元:WILEY-BLACKWELL  

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  • Space environment of an asteroid preserved on micrograins returned by the Hayabusa spacecraft 査読

    Eizo Nakamura, Akio Makishima, Takuya Moriguti, Katsura Kobayashi, Ryoji Tanaka, Tak Kunihiro, Tatsuki Tsujimori, Chie Sakaguchi, Hiroshi Kitagawa, Tsutomu Ota, Yusuke Yachi, Toru Yada, Masanao Abe, Akio Fujimura, Munetaka Ueno, Toshifumi Mukai, Makoto Yoshikawa, Jun'ichiro Kawaguchi

    PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA   109 ( 11 )   E624 - E629   2012年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:NATL ACAD SCIENCES  

    Records of micrometeorite collisions at down to submicron scales were discovered on dust grains recovered from near-Earth asteroid 25143 (Itokawa). Because the grains were sampled from very near the surface of the asteroid, by the Hayabusa spacecraft, their surfaces reflect the low-gravity space environment influencing the physical nature of the asteroid exterior. The space environment was examined by description of grain surfaces and asteroidal scenes were reconstructed. Chemical and O isotope compositions of five lithic grains, with diameters near 50 mu m, indicate that the uppermost layer of the rubble-pile-textured Itokawa is largely composed of equilibrated LL-ordinary-chondrite-like material with superimposed effects of collisions. The surfaces of the grains are dominated by fractures, and the fracture planes contain not only sub-mu m-sized craters but also a large number of sub-mu m-to several-mu m-sized adhered particles, some of the latter composed of glass. The size distribution and chemical compositions of the adhered particles, together with the occurrences of the sub-mu m-sized craters, suggest formation by hypervelocity collisions of micrometeorites at down to nm scales, a process expected in the physically hostile environment at an asteroid's surface. We describe impact-related phenomena, ranging in scale from 10(-9) to 10(4) meters, demonstrating the central role played by impact processes in the long-term evolution of planetary bodies. Impact appears to be an important process shaping the exteriors of not only large planetary bodies, such as the moon, but also low-gravity bodies such as asteroids.

    DOI: 10.1073/pnas.1116236109

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  • The influence of aeolian dust in non-allophanic Andosols on Yakushima Island 査読

    Tetsuya Eguchi, Ryoji Tanaka, Yuji Maejima, Kenji Tamura

    SOIL SCIENCE AND PLANT NUTRITION   58 ( 2 )   191 - 199   2012年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS LTD  

    The oxygen isotope (delta O-18) composition of quartz and the d((060)) values of clay minerals were determined from four pedons of non-allophanic Andosols derived mainly from the Holocene volcanic ash on Yakushima Island. These soils contained considerable amounts of aerosol-sized (1-10 mu m) and coarse (&gt;53 mu m) quartz. The delta O-18 values for the aerosol-sized quartz ranged from 14.7 parts per thousand to 17.4 parts per thousand, which was comparable to or slightly lower than known values for loess-derived Red and Yellow soils on Tanegashima Island located approximately 20 km east of Yakushima Island. The abundance and delta O-18 values of the aerosol-sized quartz indicated that non-allophanic Andosols on Yakushima Island were strongly influenced by aeolian dust. However, the presence of coarse quartz implied that granite-derived materials were also incorporated into non-allophanic Andosols. X-ray diffraction patterns for most clay minerals showed two broad peaks around 0.154 and 0.150 nm, respectively. The d((060)) values confirmed that 2:1-2:1:1 clay minerals consisted of dioctahedral and trioctahedral clay minerals. Since aeolian dust contains little or no coarse quartz and trioctahedral clay minerals, the abundance of coarse quartz and trioctahedral minerals confirmed that the occurrence of non-allophanic Andosols on Yakushima was influenced by biotite-granite, in addition to aeolian dust.

    DOI: 10.1080/00380768.2012.672926

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  • 「はやぶさ」回収試料の初期分析に至るまで:地球惑星物質総合解析システムの構築 招待 査読

    中村 栄三, 牧嶋 昭夫, 森口 拓弥, 小林 桂, 田中 亮吏, 国広 卓也, 辻森 樹

    表面科学   33 ( 12 )   681 - 686   2012年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:日本表面科学会  

    DOI: 10.1380/jsssj.33.681

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  • NORTHWEST AFRICA 6704: A UNIQUE CUMULATE PERMAFIC ACHONDRITE CONTAINING SODIC FELDSPAR, AWARUITE AND "FLUID" INCLUSIONS, WITH AN OXYGEN ISOTOPIC COMPOSITION IN THE ACAPULCOITE-LODRANITE FIELD 査読

    A. J. Irving, R. Tanaka, A. Steele, S. M. Kuehner, T. E. Bunch, J. H. Wittke, G. M. Hupe

    METEORITICS & PLANETARY SCIENCE   46   A108 - A108   2011年7月

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    記述言語:英語   出版者・発行元:WILEY-BLACKWELL  

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  • Sr-Nd-Hf-Pb isotopic characteristics of North-Western and Southern Ethiopian lithospheric mantle 査読

    A. Melesse, T. Kunihiro, T. Ota, R. Tanaka, T. Moriguti, E. Nakamura

    GEOCHIMICA ET COSMOCHIMICA ACTA   74 ( 12 )   A697 - A697   2010年6月

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    記述言語:英語   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

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  • Precise Elemental and Isotopic Analyses in Silicate Samples Employing ICP-MS: Application of Hydrofluoric Acid Solution and Analytical Techniques 査読

    Akio Makishima, Ryoji Tanaka, Eizo Nakamura

    ANALYTICAL SCIENCES   25 ( 10 )   1181 - 1187   2009年10月

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    記述言語:英語   出版者・発行元:JAPAN SOC ANALYTICAL CHEMISTRY  

    In this review, a new classification of elements based on behavior in hydrofluoric acid (HF) solution is presented for the precise quantitative analysis of each element by inductively coupled plasma mass spectrometry (ICP-MS). The elements are divided into 7 groups: (1) "fluorophile" elements; (2) insoluble fluoride-forming elements; (3) "bromophile" or "iodophile" elements; (4) "oxophile" elements; (5) "aquaphile" elements; (6) bare cation elements; and (7) other elements. Especially, the importance of fluorophile and insoluble fluoride-forming elements in elemental analysis is described. Due to the elemental characteristics, these two groups of elements cannot be dissolved simultaneously in the same solution, and thus cannot be measured together. In addition, coprecipitation of the fluorophile elements with the insoluble fluorides occurs in some conditions and hinders accurate analysis. The peculiar conditions when the coprecipitation occurs are discussed, and the "Al-addition" and "Mg-addition" methods for overcoming these problems are described. In addition, some state-of-the-art analytical techniques in ICP-MS are shown, and future directions of the element analysis are presented.

    DOI: 10.2116/analsci.25.1181

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  • CONFIRMATION OF epsilon(CR)-C-54-Delta O-17 CORRELATION IN BULK CARBONACEOUS CHONDRITES AND ITS ASTROPHYSICAL SIGNIFICANCE 査読

    Qing-Zhu Yin, K. Yamashita, A. Yamakawa, R. Tanaka, E. Nakamura, A. N. Krot, B. S. Meyer

    METEORITICS & PLANETARY SCIENCE   44   A224 - A224   2009年7月

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    記述言語:英語   出版者・発行元:WILEY-BLACKWELL  

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  • Comprehensive analysis for major, minor and trace element contents and Sr-Nd-Pb-Hf isotope ratios in sediment reference materials, JSd-1 and MAG-1

    B. Nagender Nath, Akio Makishima, Janine Noordmann, Ryoji Tanaka, Eizo Nakamura

    GEOCHEMICAL JOURNAL   43 ( 3 )   207 - 216   2009年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:GEOCHEMICAL SOC JAPAN  

    In view of the requirement of a well-characterized and easily available aquatic sediment reference material, a comprehensive analysis comprising of fifty major, minor and trace elements as well as Sr-Nd-Pb-Hf isotopes were carried out in the stream sediment reference material, JSd-1, issued by the Geological Survey of Japan. The data for marine sediment reference material, MAG-1, issued by U.S. Geological Survey is also obtained for comparison. The elements were divided into two groups: Group I and Group II. Elements in Group I form stable soluble ions in HNO3; and those in Group II form soluble oxo- and fluoro-complexes in HF, such as Zr, Nb, Hf, Ta, etc. For Group I, the sample was decomposed with HF in a tetra fluoro ethylene (TFE) bomb at 245 degrees C for 96 hrs with Mg addition. The elemental concentration was measured by quadrupole type inductively coupled plasma source mass spectrometry (ICP-QMS) and sector field type ICP-MS (ICP-SFMS) using isotope dilution-internal standardization (ID-IS) methods. The aliquot of the sample solution was passed through 3-step column chemistry for isotope ratio determination of Pb by Multiple collector (MC) ICP-MS and thermal ionization mass spectrometry (TIMS), and Sr and Nd by TIMS. For Group II elements, the sample was decomposed with H F in a TFE bomb with the same time and temperature settings. Zr, Mo, Sn, Sb and Hf were determined by I D, and Nb and Ta by ID-IS using ICP-QMS. The original JSd-1 powder showed heterogeneity for Group II elements, indicating insufficient pulverization and distribution. Thus, we further pulverized the powder and measured the concentration, which showed improved homogeneity. The aliquot for the re-pulverized powder was passed through 2-step column chemistry, and the Hf isotope ratio was determined by MC-ICP-MS. Thus a new data on the trace elements as well as Sr-Nd-Pb-Hf isotope ratios is provided for JSd-1 and MAG-1 in this paper.

    DOI: 10.2343/geochemj.1.0018

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  • Dislocation microstructures in naturally deformed olivine crystals from Hawaiian lavase 査読

    P. A. Sakyi, R. Tanaka, E. Nakamura

    GEOCHIMICA ET COSMOCHIMICA ACTA   72 ( 12 )   A819 - A819   2008年7月

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    記述言語:英語   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

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  • aEvolution of the Southern Ethiopian Rift System: Constrained from geochronological and geochemical data of mafic lavas of Amaro and Yabello areas 査読

    D. B. Tesfaye, R. Tanaka, E. Nakamura

    GEOCHIMICA ET COSMOCHIMICA ACTA   72 ( 12 )   A942 - A942   2008年7月

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    記述言語:英語   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

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  • Lead isotope systematics of olivine-hosted melt inclusions from Hawaiian lavas 査読

    R. Tanaka, P. A. Sakyi, K. Kobayashi, E. Nakamura

    GEOCHIMICA ET COSMOCHIMICA ACTA   72 ( 12 )   A930 - A930   2008年7月

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    記述言語:英語   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

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  • Hawaiian double volcanic chain triggered by an episodic involvement of recycled material: Constraints from temporal Sr-Nd-Hf-Pb isotopic trend of the Loa-type volcanoes 査読

    Ryoji Tanaka, Akio Makishima, Eizo Nakamura

    EARTH AND PLANETARY SCIENCE LETTERS   265 ( 3-4 )   450 - 465   2008年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    The two parallel loci of recent Hawaiian volcanoes, Kea and Loa, have been regarded as the best targets to interpret the chemical structure of an upwelling mantle plume derived from the lower mantle. Here we show that the Sr-Nd-Hf-Pb isotopic data of the shield-building lavas along the Loa locus form a systematic trend from the main shield stage of Koolau (&gt;2.9 Ma) to the active Loihi volcanoes. During the growth of the Koolau volcano, the dominant material in the melting region successively changed from the proposed KEA, DMK (depleted Makapuu), to EMK (enriched Makapuu) components. The proportion of EMK, dominated by a recycled mafic component, is typified by some Koolau Makapuu-stage and some Lanai lavas. Subsequently, the EMK component decreased and LOIHI component increased toward the Loihi lavas. The temporal coincidence between the episodically elevated magma production rate and the abrupt appearance of the typical Loa-type lavas that is restricted to the last 3 Myr should be linked to magma genesis. We suggest that the abrupt appearance of Loa-type magmatism should be attributed to the transient incorporation of the relatively dense recycled material and surrounding less degassed lower mantle material that accumulated near the core-mantle boundary into the upwelling plume. This episodic involvement could have been trigged by episodic thermal pulses and buoyancy increases in the plume. The continuous appearance of Kea-type lavas during the long history of Hawaiian-chain magmatism and the larger magma volume of Kea-type lavas relative to that of the Loa-type lavas in the last 3 Myr indicate that the Kea locus is closer to the thermal centre of the Hawaiian plume relative to that of the Loa locus. (C) 2007 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.epsl.2007.10.035

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  • Forsterite-rich and Ca-poor olivine phenocryst crystallized by polybaric melting in a subduction zone 査読

    R. Tanaka, E. Nakamura

    GEOCHIMICA ET COSMOCHIMICA ACTA   71 ( 15 )   A998 - A998   2007年8月

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    記述言語:英語   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

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  • Recent and episodic addition to the Hawaiian plume activity 査読

    R. Tanaka, A. Makishima, E. Nakamura

    GEOCHIMICA ET COSMOCHIMICA ACTA   70 ( 18 )   A636 - A636   2006年8月

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    記述言語:英語   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    DOI: 10.1016/j.gca.2006.06.1183

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  • Boron isotopic constraints on the source of Hawaiian shield lavas 査読

    R Tanaka, E Nakamura

    GEOCHIMICA ET COSMOCHIMICA ACTA   69 ( 13 )   3385 - 3399   2005年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    Boron isotopic compositions of lavas from three representative Hawaiian shield volcanoes (Kilauea, Mauna Loa, and Koolau) were analyzed by thermal ionization mass spectrometry. The boron isotopic composition of each sample was analyzed twice, once with and once without acid leaching to evaluate the effect of posteruptive boron contamination. Our acid-leaching procedure dissolved glass, olivine, secondary zeolite, and adsorbed boron; this dissolved boron was completely removed from the residue, which was comprised of plagioclase, pyroxenes, and newly formed amorphous silica. We confirmed that an appropriate acid-leaching process can eliminate adsorbed and incorporated boron contamination from all submarine samples without modifying the original B-11/B-10 ratio. On the other hand, when the sample was weathered, i.e., the olivine had an iddingsite rim, B-11/B-10 of the acid-resistant minerals are also modified, thus it is impossible to get the preeruptive B-11/B-10 value from the weathered samples. Through this elimination and evaluation procedure of posteruptive contamination, preeruptive delta(11)B values for the shield lavas are -4.5 to -5.4 parts per thousand for Koolau (N = 8), -3.6 to -4.6 parts per thousand, for Kilauea (N = 11), and -3.0 to -3.8 parts per thousand for Mauna Loa (N = 6).
    Historical Kilauea lavas show a systematic temporal trend for B content and Nb/B coupled with other radiogenic isotopic ratios and trace element ratios, at constant delta(11)B, indicating little or no assimilation of crustal materials in these lavas. Uncorrelated B content and delta(11)B in Koolau and Mauna Loa lavas may also indicate little or no effect of crustal assimilation in these lavas. The source of KEA-component (identical to the so-called Kea end member in Hawaiian lavas) of the Hawaiian source mantle, represented by Kilauea, should be derived from lower part of subducted oceanic crust or refractory peridotite in the recycled subducted stab. The systematic trend from Kilauea to Koolau-decreasing delta(11)B coupled with decreasing epsilon Nd as well as increasing Sr-87/Sr-86 and Pb-206/Pb-204-is consistent with involvement of subducted sediment components in the EMK(enriched Makapuu)-component, represented by Makapuu-stage of Koolau lavas. Copyright (C) 2005 Elsevier Ltd.

    DOI: 10.1016/j.gca.2005.03.009

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  • Lithium, boron, and lead isotope systematics of glass inclusions in olivines from Hawaiian lavas: evidence for recycled components in the Hawaiian plume 査読

    K Kobayashi, R Tanaka, T Moriguti, K Shimizu, E Nakamura

    CHEMICAL GEOLOGY   212 ( 1-2 )   143 - 161   2004年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Lithium (Li), boron (B), and lead (Pb) isotopic compositions of glass inclusions in olivine phenocrysts from Hawaiian lavas, (Kilauea Iki, Mauna Loa, and Koolau volcano) were measured by high mass resolution ion probe to search for possible signatures of recycled materials in the Hawaiian plume. In order to measure the isotopic compositions, a set of synthetic glass standards with matrices similar to those of the target glass inclusions was prepared. Isotopic variations among these synthetic standards were produced by additions of spikes, and their isotopic compositions were determined by TIMS. Using this set of standards, correction factors for instrumental mass fractionation for Li, B, and Pb isotope measurement were determined with internal precisions of &lt;1.2%, &lt;1.6%, and &lt;0.8% (2sigma) uncertainties for Li, B, and Pb, respectively.
    Twenty-eight glass inclusions were measured after homogenization to eliminate dendritic crystals. These glass inclusions showed isotopic variations from -10.2% to +8.4% for delta(7)Li, from -10.5% to +5.2% for delta(11)B, from 0.7994 to 0.8909 for (207) Pb/Ph-206, and from 1.989 to 2.139 for Pb-208/Pb-206, which are considerably larger than those for whole rocks. This suggests that the Hawaiian lavas are mixtures of melts derived from isotopically distinct sources, and that glass inclusions better preserve information regarding source heterogeneity than do whole rocks. In particular, significantly low delta(7)Li and delta(11)B values for the Mauna Loa and Koolau samples indicate an isotopically "light" Li and B source, perhaps containing recycled materials that experienced dehydration during subduction. The extremely low Pb isotope signature, which corresponds to HIMU, also suggests some contribution from recycled materials to the generation of the Hawaiian magma. Our results suggest that recycled materials, which experienced near-surface alteration and then dehydration during subduction, played an important role in creating geochemical heterogeneity in the Hawaiian lavas. (C) 2004 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.chemgeo.2004.08.050

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  • Boron isotopic composition of Hawaiian shield lavas 査読

    R Tanaka, E Nakamura

    GEOCHIMICA ET COSMOCHIMICA ACTA   68 ( 11 )   A46 - A46   2004年6月

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    記述言語:英語   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

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  • Suppression of Zr, Nb, Hf and Ta coprecipitation in fluoride compounds for determination in Ca-rich materials 査読

    R Tanaka, A Makishima, H Kitagawa, E Nakamura

    JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY   18 ( 12 )   1458 - 1463   2003年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ROYAL SOC CHEMISTRY  

    We have evaluated recovery yields of Zr, Nb, Hf and Ta, which are called high field strength elements (HFSE), in the synthetic Ca-Al-Mg-HF solution system using two different methods: at &lt;70&DEG;C in an ultrasonic-bath (denoted as the ultrasonic method) and at 205&DEG;C using a TFE Teflon(R) bomb (denoted as the bomb method). Full recovery of HFSE into the supernatant HF solution was not achieved in cases where fluorite (CaF2) forms in the precipitate in both methods and sellaite (MgF2) forms in the ultrasonic method. In order to suppress fluorite precipitation, an 'Al-addition method' was developed in which Al solution is added to the sample before decomposition to change the matrix solution to a composition in which no fluorite forms. Using the Al-addition method, HFSE concentrations of Ca-rich materials were analyzed by inductively coupled plasma mass spectrometry (ICP-MS) by an isotope dilution method for Zr and Hf and by a calibration curve method for Nb and Ta. Furthermore, we found isotopic disequilibria of Zr and Hf between sample and spike without Al-addition for Ca-rich samples, and that the Al-addition method was very effective in achieving isotopic equilibria and full recovery of HFSE, resulting in high accuracy in their determination.

    DOI: 10.1039/b309948b

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  • Lithium, boron and lead isotope systematics on glass inclusions in olivine phenocrysts from Hawaiian lavas 査読

    K Kobayashi, R Tanaka, T Moriguti, K Shimizu, E Nakamura

    GEOCHIMICA ET COSMOCHIMICA ACTA   67 ( 18 )   A223 - A223   2003年9月

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    記述言語:英語   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

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  • Suppression of Zr, Nb, HF, and Ta co-precipitation during HF digestion of Ca-rich geological materials 査読

    R Tanaka, H Kitagawa, A Makishima, E Nakamura

    GEOCHIMICA ET COSMOCHIMICA ACTA   67 ( 18 )   A475 - A475   2003年9月

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    記述言語:英語   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    DOI: 10.1039/b309948b

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  • Evolution of an isotopically depleted mantle xenolith from salt lake crater, Hawaii 査読

    E Nakamura, C Sakaguchi, R Tanaka, T Moriguti, Kushiro, I

    GEOCHIMICA ET COSMOCHIMICA ACTA   67 ( 18 )   A324 - A324   2003年9月

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    記述言語:英語   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

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  • Comprehensive geochemical analyses of small amounts (100 mg) of extraterrestrial samples for the analytical competition related to the sample-return mission, MUSES-C. 査読

    Nakamura, E, Makishima, A, Moriguti, T, Kobayashi, K, Sakaguchi, C, Yokoyama, T, Tanaka, R, Kuritani, T, Takei, H

    Institute of Space and Astronautical Science Report SP   16   49 - 101   2003年

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    記述言語:英語   出版者・発行元:宇宙航空研究開発機構  

    We have participated in the analytical competition related to the sample-return mission, MUSES-C of the ISAS, to be launched in May 2003 and returned in summer 2007. In this competition, we have determined major and trace element abundances and isotopes (as many as possible), both for two powdered samples provided by the ISAS and for chondrules separated from Allende meteorite as an additional demonstration of our high-spatial resolution analytical capabilities for fragment samples. 100 mg of each of the competition samples, 1C and 2C, were split into two fractions of approximately 30 and 70 mg for the determinations of elemental abundances and the isotope analyses, respectively. The bulk concentrations of 55 elements in each 30 mg sample were analyzed by quadruple-type ICP-MS and sector-type ICP-MS with analytical uncertainties better than 10 percent (1 sigma). B, Pb, Li, Rb, Sr, Sm and Nd were successively separated from the remaining 70 mg of each of the samples, using a novel integrated, multi-ion exchange column chemistry approach, and then the isotopes of these elements were successfully determined by TIMS with analytical errors similar to those for analyses of terrestrial samples. The Sr, Nd, Re and Os isotopic compositions were also analyzed using the remaining aliquots of the sample solutions for trace element analyses by ICP-MS. The results obtained in this study indicate that 1C and 2C samples are probably ordinary chondrite and the Allende meteorite, respectively. However, extreme W, Ta and Nb enrichments in the 1C were probably caused by contamination during sample preparation. Furthermore, both of the samples were extensively contaminated by B from the borosilicate glass container in which the samples were delivered. Five chondrules were separated from Allende meteorite and then sliced into three pieces using a dicing saw. The center slices were used to petrographically determine the mineral phases, compositionally map these phases by SEM-EDX, and obtain quantitative major and trace element compositions (30 elements) by SEM-EDX and ion microprobe. The two outer slices, for which sample masses were less than 1 mg, were chemically treated to obtain the bulk trace elements and isotope compositions of the chondrules. For the chondrule slices, 24 trace elements and Sr and Nd isotopic compositions were determined with extremely small analytical uncertainties by ICP-MS and TIMS (for Sr and Nd, respectively). Based on the analytical experience, including this competition, we believe that all of the analyses carried out could have been completed within 50 days if we could have concentrated on this project alone during that 50-day period. In this report, we describe the analytical techniques employed for the powdered samples and the chondrules, and we present all of the results obtained during the approximately 3-month period of the analytical competition.

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  • Re-Os age of molybdenite from the Busetsu two-mica granite, central Japan.

    Ishihara, S, Stein, H. J, Tanaka, R

    Bulletin of the Geological Survey of Japan   53 ( 5 )   479 - 482   2002年

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    記述言語:英語   出版者・発行元:産業技術総合研究所地質調査総合センター  

    DOI: 10.9795/bullgsj.53.479

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  • Geochemical evolution of koolau volcano. Hawaii 査読

    Ryoji Tanaka, Eizo Nakamura, Eiichi Takahashi

    Geophysical Monograph Series   128   311 - 332   2002年

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    記述言語:英語   掲載種別:論文集(書籍)内論文   出版者・発行元:Blackwell Publishing Ltd  

    Major and trace-element and Sr, Nd, and Pb isotopic compositions have been determined for Koolau shield lavas and Nuuanu and Wailau landslide deposits, Hawaii. The Koolau shield is composed of older main shield-stage and younger Makapuu-stage lavas. Lavas of the main shield-stage are exposed low in the subaerial Nuuanu Pali and in Nuuanu landslide deposits. Main shield-stage lavas resemble Loa- or Kea-type compositions
    they are characterized by lower Ba/Nb, La/Nb, Pb/Nd, Sr/Nb, Nd/Nb, Zr/Nb, and 87Sr/86Sr, and by higher 143Nd/144Nd and 206Pb/204Pb than those of Makapuu-stage lavas (Koolau-type). Sr-Nd-Pb isotope systematics suggest that Koolau shield lavas were generated from at least three endmembers, such as: Enriched Makapuu (EMK), Depleted Makapuu (DMK), and Kea (KEA) components. The proportion of these endmembers successively changed from earlier KEA-dominated to later EMK-dominated. Koolau shield-stage lavas span nearly the entire range of the isotopic compositions reported previously for shield-stage lavas from all Hawaiian islands, and reveal secular changes in the amounts of plume components.

    DOI: 10.1029/GM128p0311

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  • ハワイアンプリューム端成分としてのマントル捕獲岩の発見?

    中村 栄三, 坂口 千恵, 田中 亮吏, 森口 拓弥, 久城 育夫

    日本岩石鉱物鉱床学会 学術講演会 講演要旨集   2002   251 - 251   2002年

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    出版者・発行元:日本鉱物科学会  

    DOI: 10.14824/jampeg.2002.0.251.0

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  • Paired sulfur isotopic belts: late Cenozoic ore deposits of Southwest Japan.

    Ishihara, S, Sasaki, A, Minagawa, T, Bunno, M, Shishido, A, Tanaka, R

    Bulletin of the Geological Survey of Japan   51 ( 7 )   283 - 297   2000年

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    記述言語:英語   出版者・発行元:経済産業省産業技術総合研究所地質調査所  

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  • The discovery of Indo-Sinian granites in Manchzhouli area: Evidence from Rb-Sr isochrons.

    Qin, K. Z, Tanaka, R, Li, W. S, Ishihara, S

    Acta Petrologica et Mineralogica   17   235 - 240   1998年

  • The timing and geneses of ilmenite-series and magnetite-series granitic magmatism in the north-central Hokkaido, Japan.

    Ishihara, S, Matsuhisa, Y, Tanaka, R, Ihara, H, Nagasaka, A, Koike, T, Shibata, K

    Bulletin of the Geological Survey of Japan   49 ( 12 )   605 - 620   1998年

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    記述言語:英語   出版者・発行元:経済産業省産業技術総合研究所地質調査所  

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  • Sr and Nd isotopic data for the seven GSJ rock reference samples; JA-1, JB-1a, JB-2, JB-3, JG-1a, JGb-1 and JR-1 査読

    Y Orihashi, J Maeda, R Tanaka, R Zeniya, K Niida

    GEOCHEMICAL JOURNAL   32 ( 3 )   205 - 211   1998年

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    記述言語:英語   出版者・発行元:GEOCHEMICAL SOC JAPAN  

    We measured Sr-87/Sr-86 and Nd-143/Nd-144 ratios and carried out analytical test of Sr and Nd isotopic standards for the seven GSJ rock reference samples (hereafter GSJ-RRSs); JA-1, JB-1a, JB-2, JB-3, JG-1a, JGb-1 and JR-1. Our mean values of five separate analyses for the GSJ-RRSs are summarized in Table 1, in agreement with the ranges of previously published data. Our mean values for 87Sr/86Sr ratios of JB-2 and JGb-1 and Nd-143/Nd-144 ratio of JR-1, however, show a slightly large Variation as compared with the other JGS-RRSs. Further data accumulation with specification of split/position number is required to evaluate homogeneity in Sr and Nd isotopic compositions.

    DOI: 10.2343/geochemj.32.205

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  • Chemical and mineralogical characteristics of the Kanamaru pegmatite deposit, Niigata prefecture, Japan.

    Nanbu, A, Hamano, K, Tanaka, R, Ishihara, S

    Resource Geology   47   1 - 10   1997年

  • XRF analysis of major and trace elements for silicate rocks using low dilution ratio fused glass.

    Tanaka, R, Orihashi, Y

    HUEPS Technical Report, Hokkaido University   2   1 - 20   1997年

  • Sondeos subterráneos sin excavacíon en El Salvador. Antología de Chalchuapa.

    Tanaka, Y, Tanaka, R, Itami, A, O'Neil

    Universidad de Estudios Extranjeros de Kyoto.   36 - 50   1997年

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  • Magnetic susceptibility of late Cenozoic volcanic rocks of east-central Hokkaido and the Kuril Island.

    Ishihara, S, Tanaka, R, Nakagawa, M, Goto, Y

    Resource Geology Special Issue   18   217 - 228   1995年

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MISC

  • 黄砂がもたらす蛇紋岩アノマリーの緩和効果

    中尾淳, 片岡純佳, 富田真悠, 山崎慎一, 田中亮吏, 和穎朗太, 矢内純太

    日本土壌肥料学会講演要旨集   64   81   2018年8月

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    記述言語:日本語  

    J-GLOBAL

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  • 10.1038/s41598-018-28219-x

    8   1 - 12   2018年

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  • 酸素同位体比とK‐Ar年代を利用した火山灰‐黄砂混合比の推定

    中尾淳, 寺島真惟, ELLIOTT Crawford, WAMPLER Marion, 田中亮吏, 矢内純太

    日本地球惑星科学連合大会予稿集(Web)   2018   ROMBUNNO.MIS14‐10 (WEB ONLY)   2018年

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    記述言語:日本語  

    J-GLOBAL

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  • 地球惑星物質総合解析システムの構築と応用

    中村栄三, 牧嶋昭夫, 森口拓弥, 小林桂, 田中亮吏, 国広卓也, 北川宙, 太田努, 坂口千恵, 山中正博

    法政大学イオンビーム工学研究所シンポジウム講演予稿集   36th   2017年

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  • ハワイ・シールドステージマグマ起源物質のホウ素同位体による制約

    田中 亮吏, 中村 栄三

    日本鉱物学会・学術講演会,日本岩石鉱物鉱床学会学術講演会講演要旨集   2004   232 - 232   2004年9月

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  • ハワイ火山岩のオリビンガラス包有物のリチウム・ホウ素・鉛同位体システマティクス

    小林 桂, 田中 亮吏, 森口 拓弥, 清水 健二, 中村 栄三

    日本鉱物学会・学術講演会,日本岩石鉱物鉱床学会学術講演会講演要旨集   2004   186 - 186   2004年9月

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  • 領家帯最高変成時期における火成活動の特徴

    田中亮吏

    月刊地球   号外30号   64 - 69   2000年

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講演・口頭発表等

  • Enstatite chondrite chondrules explain the oxygen isotope variation of building blocks of inner planetary embryos

    4th International Geoscience Symposium Precambrian World 2017  2017年 

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  • Characteristics and the distribution of source materials for OIB at the West African passive margin

    Goldschmidt 2017  2017年 

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  • Fractionation behavior of 238U-series nuclides during acid leaching of basaltic samples

    2016年 

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  • Gas-melt reaction in the reduced nebula environment revealed by oxygen isotope of EH chondrites

    Goldschmidt meeting 2016  2016年 

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  • Fractionation behavior of 238U-series nuclides during acid leaching of basaltic samples

    Misasa VI “Frontiers in Earth and Planetary Materials Research: Origin, Evolution and Dynamics”  2016年 

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  • Gas-melt reaction in the reduced nebula environment revealed by oxygen isotope of EH chondrites

    Goldschmidt meeting 2016  2016年 

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  • 53Mn-53Cr systematics of Allende chondrules and ε54Cr―Δ17O correlation in bulk carbonaceous chondrites

    Yin, Q. Z, Yamashita, K, Yamakawa, A, Tanaka, R, Jacobsen, B, Ebel, D, Hutcheon, I. D, Nakamura, E

    40th Lunar and Planetary Science Conference  2009年 

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  • Evolution of Hawaiian shield volcano revealed by antecryst-hosted melt inclusions

    American Geophysical Union 2009 Fall Meeting  2009年 

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  • Chemical Structure of the Hawaiian Plume and Formation of the Double Volcanic Chain

    MISASA‐3 "Origin, Evolution and Dynamics of the Earth: a tribute to Eiji Ito" 2007/03/21-23  2008年 

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  • Chemical structure of the Hawaiian plumeand its 0 - 3 Ma evolution

    日本地球惑星科学連合2008年大会  2008年 

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  • Lead isotope systematics of olivine-hosted melt inclusions from Hawaiian lavas

    Goldschmidt conference  2008年 

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  • Dislocation microstructures in naturally deformed olivine crystals from Hawaiian lavase

    Goldschmidt conference  2008年 

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  • Evolution of the Southern Ethiopian Rift System: Constrained from geochronological and geochemical data of mafic lavas of Amaro and Yabello areas

    Goldschmidt Conference  2008年 

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  • Forsterite-rich and Ca-poor olivine phenocryst crystallized by polybaric melting in a subduction zone

    17th V.M.Goldshmidt Conference  2007年 

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  • Phanerozoic Crustal Growth Constrained by Zircon U-Pb Age and Sr-Nd-Hf Isotopic Evidence from the Granitoid Rocks in Mongolia

    17th V.M.Goldschmidt Conference  2007年 

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  • Intra-shield geochemical evolution of the Hawaiian volcano as inferred from the Hf isotope systematics of the Koolau shield

    2nd International Symposium Misasa, The Evolution of Early Stage of Earth and Solar System  2006年 

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  • Recent and episodic addition to the Hawaiian plume activity

    16th V.M.Goldschmidt Conference  2006年 

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  • Source heterogeneity versus crustal assimilation or post-magmatic contamination for the Hawaiian shield lavas.

    COE-21 International Symposium Misasa, Origin, Evolution, and Dynamics of the Earth –Present & Future Research-  2005年 

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  • The Rajmahal flood basalt province, northern India; constraints on its temporal definition and petrogenesis.

    COE-21 International Symposium Misasa, Origin, Evolution, and Dynamics of the Earth –Present & Future Research-  2005年 

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  • ホウ素同位体を用いた岩石-水相互作用の評価

    資源素材学会年会  2005年 

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  • Boron isotopic composition of Hawaiian shield lavas.

    14th V.M.Goldschmidt Conference  2004年 

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  • ハワイ・シールドステージマグマ起源物質のホウ素同位体による制約

    日本岩石鉱物鉱床学会2004年学術講演  2004年 

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  • Suppression of Zr, Nb, Hf, and Ta Co-precipitation during HF Digestion of Ca-rich Geological Materials.

    13th V.M.Goldschmidt Conference  2003年 

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  • Lithium, Boron, and Lead Isotope Systematics on Glass Inclusions in Olivine Phenocrysts from Hawaiian Lavas.

    13th V.M.Goldschmidt Conference  2003年 

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  • Evolution of an Isotopically Depleted Mantle Xenolith from Salt Lake Crater, Hawaii.

    13th V.M.Goldschmidt Conference  2003年 

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産業財産権

  • 試料中の微量元素を測定する方法、微量元素とフッ化物との共沈を抑制する方法

    田中亮吏・北川宙・牧嶋昭夫・中村栄三

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    出願番号:特願2003-204828  出願日:2003年7月3日

    特許番号/登録番号:3755039 

共同研究・競争的資金等の研究

  • マルチ元素3安定同位体物質反応解読法の開発

    研究課題/領域番号:20K04108  2020年04月 - 2023年03月

    日本学術振興会  科学研究費助成事業 基盤研究(C)  基盤研究(C)

    田中 亮吏

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    配分額:4290000円 ( 直接経費:3300000円 、 間接経費:990000円 )

    安定同位体は、様々な化学・生物反応過程において、質量依存分別を生じるため、自然界における物質反応過程を解読する為の優れたトレーサーである。一方で、安定同位体は個々の反応過程において、平衡論的同位体効果(EIE)と速度論的同位体効果(KIE)を生じるが、2つの同位体(=1つの同位体比)では、EIEとKIEを判別する術を持たない。これを解決するのが、3安定同位体法である。本研究では、申請者がこれまで開発してきた3酸素同位体解析法に加え、ケイ素と遷移元素等の安定同位体解析法を開発し、小惑星や初期惑星系における固液気相間反応過程、初期惑星表層における生命活動痕跡解読、初期地球表層温度推定等の研究に応用することを目的としている。
    令和2年度には、ケイ素、マグネシウム、ニッケル、クロム、カルシウム同位体分析方法の開発および酸素・ケイ素同位体分析を用いた応用研究を行った。本研究では、岩石試料から、当該元素の単離技術の開発と改良化、および同位体分析方法の開発を行った。同位体分析については、ケイ素およびニッケルは、マルチコレクター誘導結合プラズマ質量分析計を、クロムおよびカルシウムは、表面電離型質量分析計を、酸素はガスソース同位体比質量分析計を用いた。
    応用研究の代表例として、エンスタタイトコンドライト隕石に含まれるコンドリュールおよびユレイライト隕石の酸素とケイ素同位体を用いた研究を行った。ケイ素と酸素同位体の関係性から、コンドリュールが、原始太陽系円盤から早期に形成したメタルと珪酸塩鉱物によって構成される塵が、瞬間的な加熱によって蒸発し、この蒸発したガスと、溶融した珪酸塩メルトの反応によって形成されたものであると結論づけた。この結果は、これらの反応が生じた際の塵とガス全体のSi/Mgは、星雲内での塵/ガス比や、塵に含まれる金属/珪酸塩鉱物比によって、決定づけられたことを示唆している。

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  • 高精度火山噴火年代測定法の開発と応用

    研究課題/領域番号:16K05578  2016年04月 - 2019年03月

    日本学術振興会  科学研究費助成事業 基盤研究(C)  基盤研究(C)

    田中 亮吏, チョウ シャオユウ, ゲタチェウ ベライ・イヤス

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    配分額:4550000円 ( 直接経費:3500000円 、 間接経費:1050000円 )

    噴火に伴う元素分別を利用した火山噴火年代測定方法を確立するため、珪酸塩マグマの固-液-気相間における元素・同位体分別を解析する為の分析方法および238U-230Th放射非平衡噴火年代測定方法の開発を行った。前者については、岩石試料からの高精度水素、酸素、窒素、炭素、強親鉄元素組成および同位体組成分析方法を確立した。後者については、第四紀玄武岩試料を用いて、水素同位体を用いたメルト-揮発性成分分別過程の解析から、噴火に伴いウラン-トリウムが分別することを明らかにし、更に火山岩の石基の酸分解により得られた鉱物フラクションを用いて、高精度火山噴火年代を求める事が可能であることを示した。

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  • 黄砂として飛来する放射性セシウム吸着剤(雲母)が日本の土壌に与えた累積影響の解明

    研究課題/領域番号:16H06188  2016年04月 - 2019年03月

    日本学術振興会  科学研究費助成事業 若手研究(A)  若手研究(A)

    中尾 淳, エリオット クロフォード, 田中 亮吏, 江口 哲也, 成瀬 敏郎, 久保寺 秀夫, 高原 光

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    配分額:19890000円 ( 直接経費:15300000円 、 間接経費:4590000円 )

    地質史を通じた黄砂の飛来・堆積によって,日本の土壌は放射性セシウムを吸着する能力を得たのではないか?この仮説を検証するために,鍵となる堆積年代が識別された火山灰や泥炭の累積層から黄砂の粒径範囲である<20μmの微細粒子を分画し,様々な化学・鉱物学・同位体地球学的な分析を実施した。その結果,1)K-Ar年代と単離石英のδ18O値から推定された火山灰中の黄砂存在比が大きいほど,RCs固定能が高く,2)火山灰への黄砂混入比が火山からの距離が離れるほど増加すること,3)寒冷な古環境での黄砂の堆積がRCs固定能増加に重要であることなど,仮説を支持する新事実を明らかにすることができた。

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  • 地球史海洋底断面復元プロジェクト:太古代から原生代への環境大変動解明

    研究課題/領域番号:26257211  2014年04月 - 2018年03月

    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)

    清川 昌一, 山口 耕生, 田中 亮吏, 堀江 憲路, 伊藤 孝, 後藤 孝介, 尾上 哲治, 菅沼 悠介, 池原 実

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    配分額:39650000円 ( 直接経費:30500000円 、 間接経費:9150000円 )

    海底断面復元について,31億年前(オーストラリア・ピルバラ/
    Cleaverivlle Formation: DXCL掘削),23億年前(ガーナ・ビリミアン:GHB掘削),18億年前(カナダ・トランスハドソン:鉱山コア),7億年前(エジプト・東砂漠地域:陸上調査)の地層を選び,できるだけ精度の高い層序を復元し,新鮮な試料を取得してそれぞれの時代の地層断面を明らかにした.コアはそれぞれ200-400mの層序復元ができ,有機物を含む黒色頁岩に着目して,全炭素濃度や同位体,そこに含まれる黄鉄鉱から硫黄同位体の変動を明らかにした.

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  • 実時間スケールの決定によるマグマダイナミクスの解明

    研究課題/領域番号:23340160  2011年04月 - 2014年03月

    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)

    中村 栄三, 牧嶋 昭夫, 田中 亮吏, 小林 桂

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    配分額:19760000円 ( 直接経費:15200000円 、 間接経費:4560000円 )

    本研究は,火山活動におけるマグマダイナミクスに関しての理解を推し進めるため,噴出物から絶対的な時間軸を取り出す手法の開発とその応用を試みた.研究の結果,マルチコレクションICP-MSを用いた新たなU-Th-Ra放射非平衡年代測定法を開発し,その応用として富士火山の噴出物の解析を実施した.また噴出年代を決定するため,新たなK-Ar年代測定法を確立し10万年を切る若い火山岩に対して精密に噴出年代を決定する方法を確立した.巨大珪長質噴火をマグマダイナミクスとして説明するモデルを構築し,公表した.

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担当授業科目

  • アストロバイオロジー (2022年度) 後期  - 金3~4

  • マントル地球化学 (2022年度) 前期  - その他

  • 分析地球惑星化学ゼミナール (2022年度) 通年  - その他

  • 分析地球惑星化学演習I (2022年度) 前期  - その他

  • 分析地球惑星化学演習II (2022年度) 後期  - その他

  • 分析地球惑星化学演習III (2022年度) 後期  - その他

  • 分析地球惑星化学特別研究 (2022年度) 通年  - その他

  • 同位体地球宇宙化学 (2022年度) 前期  - 水5~6

  • 地球惑星有機物解析学 (2022年度) 後期  - 月1~2

  • アストロバイオロジー (2021年度) 後期  - 金3~4

  • マントル地球化学 (2021年度) 前期  - その他

  • 分析地球惑星化学ゼミナール (2021年度) その他  - その他

  • 分析地球惑星化学ゼミナール (2021年度) 通年  - その他

  • 分析地球惑星化学演習I (2021年度) 前期  - その他

  • 分析地球惑星化学演習II (2021年度) 後期  - その他

  • 分析地球惑星化学演習III (2021年度) 後期  - その他

  • 分析地球惑星化学特別研究 (2021年度) その他  - その他

  • 分析地球惑星化学特別研究 (2021年度) 通年  - その他

  • 同位体地球宇宙化学 (2021年度) 前期  - 月3~4

  • 地球惑星有機物解析学 (2021年度) 後期  - その他

  • 地球惑星有機物解析学 (2021年度) 後期  - その他

  • マントル地球化学 (2020年度) 前期  - その他

  • 分析地球惑星化学ゼミナール (2020年度) その他  - その他

  • 分析地球惑星化学ゼミナール (2020年度) 通年  - その他

  • 分析地球惑星化学演習I (2020年度) 前期  - その他

  • 分析地球惑星化学演習II (2020年度) 後期  - その他

  • 分析地球惑星化学演習III (2020年度) 後期  - その他

  • 分析地球惑星化学特別研究 (2020年度) その他  - その他

  • 分析地球惑星化学特別研究 (2020年度) 通年  - その他

  • 揮発性物質地球惑星化学 (2020年度) 後期  - その他

▼全件表示

 

メディア報道

  • 地球型惑星の材料物質:原始太陽系での進化過程解明 新聞・雑誌

    科学新聞  科学新聞  1面  2021年6月11日

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    執筆者:本人以外 

  • 同位体組成が記録する地球型惑星の形成環境 新聞・雑誌

    読売新聞  読売新聞  2018年10月

  • 原始惑星起源値と一致 新聞・雑誌

    日本海新聞  日本海新聞  2017年5月28日

  • 地球組成の理解へ重要発見 テレビ・ラジオ番組

    NHK  NHK  2017年5月28日

  • 火山形成に新タイプ 新聞・雑誌

    日本海新聞  日本海新聞  2019年7月10日

  • 初期太陽系における地球型惑星の材料物質の進化を解明 インターネットメディア

    Yahoo等  Yahooニュース等  2021年5月

  • 火の玉実は火星の隕石 新聞・雑誌

    New York Times, 日本経済新聞ほか  New York Times, 日本経済新聞ほか  2012年1月18日

  • 中四国ライブネット 岡山発 「技術の森スペシャル 夢・未来研究室2022」 テレビ・ラジオ番組

    RSK山陽放送他全8局  2022年6月26日

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  • 小惑星リュウグウの起源と進化 新聞・雑誌

    Washington Post, 朝日、毎日、日経、読売、産経新聞ほか新聞各紙  2022年6月

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  • 小惑星リュウグウの起源と進化 テレビ・ラジオ番組

    NHK、TBSほか各テレビ局  2022年6月

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  • 技術の森 テレビ・ラジオ番組

    RSK山陽放送  2022年1月12日

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  • 技術の森 テレビ・ラジオ番組

    RSK山陽放送  2022年1月5日

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