Yokoyama Tetsuya

ヨコヤマテツヤ | Yokoyama Tetsuya

Affiliation and department：
Job title： Professor

Research field (2)： Analytical chemistry , Space and planetary science

Research keywords (7)： Nucleosynthesis , Mass spectrometry , Trace elements , Chronology , Isotopes , Meteorites , Early Solar System

Research theme for competitive and other funds (24)：

2023 - 2027 Meteoritic and theoretical studies on the origin of isotopic dichotomy in meteorites
2021 - 2026 Multi-isotopic analyses of the samples returned from Ryugu: Toward the comprehensive understanding of the origin and formation history of C-type asteroids
2019 - 2023 Construction of Earth formation model by isotopic analysis of siderophile elements in meteorites and Archean igneous rocks
2018 - 2023 星と隕石の組成解読を基軸としたr過程元素の起源・進化の解明
2020 - 2022 Chemical and isotopic analyses of asteroid samples returned by Hayabusa2 mission

2019 - 2022 Investigation of the plume source regions using mantle xenoliths

2018 - 2022 沈み込む海山が島弧火山活動に及ぼす影響

2018 - 2020 隕石の超高精度Mo同位体分析による地球の水の起源に関する研究

2016 - 2019 Decoding the origin of solar system from the isotope anomalies of heavy elements in meteorites

2014 - 2019 冥王代地球

2014 - 2019 Decoding of the early earth's evolution

2015 - 2017 Dating of presolar grains by nuclear cosmochronology

2014 - 2017 Characterization and genesis of mantle compositional hemispheres

2013 - 2016 Water content of the mantle transition zone constrained by volcanic rocks

2011 - 2016 Growth of the second continent and mantle dynamics: Insights from a history of continental growth and tectonic erosion

2014 - 2015 冥王代の固体地球進化解読

2012 - 2015 Study of Chondrule Formation Processes: An Approach Combining Theoretical Calculations and Measurements of Shape, Composition, and Texture of Chondrules

2011 - 2014 Origin of heterogeneous isotope distribution for heavy elements in the early solar system

2009 - 2014 Generation and migration dynamics of geofluids

2009 - 2014 Geofluid: Nature and dynamics of fluids in subduction zones

2010 - 2012 Heterogeneity of subduction zone mantle: Towards geochemical tomography

2009 - 2010 High precision isotope analyses of presolar grains for the study of stellar nucleosynthesis

2005 - 2008 Japan-Russia-USA joint research of volcanic activity, seismic activity and crustal deformation of Kuril arc

2001 - 2003 ウラン・トリウム放射非平衡を用いた島孤マグマ供給系の進化の研究

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Papers (145)：

Yuki Masuda, Martin Schiller, Martin Bizzarro, Tetsuya Yokoyama. Calcium isotope evidence for the formation of early condensates in the Solar System from unmixed reservoirs with distinct nucleosynthetic origins. Geochimica et Cosmochimica Acta. 2025
Fridolin Spitzer, Thorsten Kleine, Christoph Burkhardt, Timo Hopp, Tetsuya Yokoyama, Yoshinari Abe, Jérôme Aléon, Conel M. O’D Alexander, Sachiko Amari, Yuri Amelin, et al. The Ni isotopic composition of Ryugu reveals a common accretion region for carbonaceous chondrites. Science Advances. 2024
Toshihiro Yoshimura, Daisuke Araoka, Hiroshi Naraoka, Saburo Sakai, Nanako O. Ogawa, Hisayoshi Yurimoto, Mayu Morita, Morihiko Onose, Tetsuya Yokoyama, Martin Bizzarro, et al. Breunnerite grain and magnesium isotope chemistry reveal cation partitioning during aqueous alteration of asteroid Ryugu. Nature Communications. 2024
Zachary A. Torrano, Michelle K. Jordan, Timothy D. Mock, Richard W. Carlson, Ikshu Gautam, Makiko K. Haba, Tetsuya Yokoyama, Yoshinari Abe, Jérôme Aléon, Conel Alexander, et al. Neodymium-142 deficits and samarium neutron stratigraphy of C-type asteroid (162173) Ryugu. Meteoritics & Planetary Science. 2024
Raimundo Brahm, Daniel Coulthard Jr, Georg Zellmer, Takeshi Kuritani, Naoya Sakamoto, Hajime Taniuchi, Hisayoshi Yurimoto, Mitsuhiro Nakagawa, Eiichi Sato. Olivine-Hosted Melt Inclusions Track Progressive Dehydration Reactions in Subducting Slabs Across Volcanic Arcs. Journal of Petrology. 2024

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MISC (15)：

深海雄介, 飛田南斗, 横山哲也, 森脇涼太, 臼井寛裕. 宇宙地球化学における高精度鉛同位体分析手法. NINS分野融合型共同研究ワークショップ『量子ビームを用いた次世代非破壊分析技術とその応用惑星物質科学との可能性』. 2018
杉本圭, 深井稜汰, 横山哲也, 鏡味沙耶, 羽場麻希子. 非炭素質コンドライト隕石の高精度Sr同位体測定. 日本地球化学会年会要旨集(Web). 2017. 64th. ROMBUNNO.3A11(J-STAGE)-195
Tobita Minato, Asanuma Hisashi, Fukami Yusuke, Moriwaki Ryota, Yokoyama Tetsuya, Usui Tomohiro. Development of Precise Pb Isotope Analysis for Zircon Using Total Evaporation TIMS (TE-TIMS). Abstracts of Annual Meeting of the Geochemical Society of Japan. 2017. 64. 0. ROMBUNNO.3P41(J-STAGE)-295
深海雄介, 飛田南斗, 横山哲也, 森脇涼太, 臼井寛裕. トータルエバポレーションTIMSと²⁰⁴Pb-²⁰⁷Pbダブルスパイク法を併用した極微量鉛同位体分析手法の開発. 日本地球化学会年会講演要旨集. 2016. 63rd. 197
Kuritani Takeshi, Tanaka Mayumi, Yokoyama Tetsuya, Nakagawa Mitsuhiro, Matsumoto Akiko. P58 Generation condition of basaltic magma from Usu Volcano. PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN. 2015. 2015. 0. 156-156

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Education (5)：

1995 - 1998 University of Tokyo School of Science Department of Chemistry, Doctoral Course
- 1998 The University of Tokyo Graduate School, Division of Science Department of Chemistry
1993 - 1995 University of Tokyo School of Science Department of Chemistry, Master Course
1991 - 1993 University of Tokyo School of Science Department of Chemistry
- 1993 The University of Tokyo Faculty of Science Department of Chemistry

Professional career (1)：

Doctor of Philosophy (Okayama University)

Work history (8)：

2017/04 - 現在 Tokyo Institute of Technology School of Science, Department of Earth and Planetary Sciences Professor
2016/04 - 2017/03 Tokyo Institute of Technology School of Science, Department of Earth and Planetary Sciences Associate Professor
2007/10 - 2016/03 Tokyo Institute of Technology School of Science, Department of Earth and Planetary Sciences Associate Professor
2005 - 2008 University of Maryland Department of Geology Research Associate
2003 - 2005 Okayama University

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Awards (1)：

2004 - 日本地球化学会奨励賞

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