Okayama University

2003 - 2005

Okayama University

2001 - 2003

Okayama University

1998 - 2001

Okayama University

1998

Oued Chebeika 002: A new <scp>CI1</scp> meteorite linked to outer solar system bodies

J. Gattacceca, M. Gounelle, B. Devouard, J.‐A. Barrat, L. Bonal, A. J. King, C. Maurel, P. Beck, M. Roskosz, J.‐C. Viennet, D. Mukherjee, N. Dauphas, P. R. Heck, K. López García, O. Poch, O. Grauby, C. S. Harrison, V. Vinogradoff, P. Vernazza, S. Tikoo, V. Vidal, P. Rochette, D. AuYang, D. Borschneck, J. Juraszek, B. Clark

Meteoritics & Planetary Science   2025.7

“CY1” Chondrites Produced by Impact Dehydration of the CI Chondrite Parent Body

Ke 柯 Zhu 朱, Nao Nakanishi, Jan Render, Quinn R. Shollenberger, Tetsuya Yokoyama, Akira Ishikawa, Lu Chen

The Astrophysical Journal Letters   2025.5

Zirconium isotope composition indicates s‐process depletion in samples returned from asteroid Ryugu

Schönbächler Maria, Manuela A. Fehr, Tetsuya Yokoyama, Ikshu Gautam, Nao Nakanishi, Yoshinari Abe, Jérôme Aléon, Conel M.O'D. Alexander, Sachiko Amari, Yuri Amelin, Ken‐ichi Bajo, Martin Bizzarro, Audrey Bouvier, Richard W. Carlson, Marc Chaussidon, Byeon‐Gak Choi, Nicolas Dauphas, Andrew M. Davis, Tommaso Di Rocco, Wataru Fujiya, Ryota Fukai, Makiko K. Haba, Yuki Hibiya, Hiroshi Hidaka, Hisashi Homma, Peter Hoppe, Gary Huss, Kiyohiro Ichida, Tsuyoshi IIZUKA, Trevor Ireland, Akira Ishikawa, Shoichi Itoh, Noriyuki Kawasaki, Noriko T. Kita, Koki Kitajima, Thorsten Kleine, Shintaro Komatani, Alexander Krot, Ming‐Chang Liu, Yuki Masuda, Mayu Morita, Kazuko Motomura, Frédéric Moynier, Izumi Nakai, Kazuhide Nagashima, Ann Nguyen, Larry Nittler, Morihiko Onose, Andreas Pack, Changkun Park, Laurette Piani

Meteoritics & Planetary Science   2025.1

Calcium isotope evidence for the formation of early condensates in the Solar System from unmixed reservoirs with distinct nucleosynthetic origins

Yuki Masuda, Martin Schiller, Martin Bizzarro, Tetsuya Yokoyama

Geochimica et Cosmochimica Acta   2025.1

Five-stage multielement separation procedure: A unique and essential tool for the multi-isotopic analyses of precious (<30 mg) extraterrestrial materials

Ikshu Gautam, Tetsuya Yokoyama, Mary F. Horan, Richard W. Carlson

GEOCHEMICAL JOURNAL   2025

The Elemental Abundances of Ryugu: Assessment of Chemical Heterogeneities and the Nugget Effect

Tetsuya Yokoyama

ArXiv   2025

The elemental abundances of Ryugu: Assessment of chemical heterogeneities and the nugget effect

Tetsuya Yokoyama, Nicolas Dauphas, Ryota Fukai, Tomohiro Usui, Shogo Tachibana, Maria Schönbächler, Henner Busemann, Masanao Abe, Toru Yada

GEOCHEMICAL JOURNAL   2025

The Ni isotopic composition of Ryugu reveals a common accretion region for carbonaceous chondrites

Fridolin Spitzer, Thorsten Kleine, Christoph Burkhardt, Timo Hopp, Tetsuya Yokoyama, Yoshinari Abe, Jérôme Aléon, Conel M. O’D Alexander, Sachiko Amari, Yuri Amelin, Ken-ichi Bajo, Martin Bizzarro, Audrey Bouvier, Richard W. Carlson, Marc Chaussidon, Byeon-Gak Choi, Nicolas Dauphas, Andrew M. Davis, Tommaso Di Rocco, Wataru Fujiya, Ryota Fukai, Ikshu Gautam, Makiko K. Haba, Yuki Hibiya, Hiroshi Hidaka, Hisashi Homma, Peter Hoppe, Gary R. Huss, Kiyohiro Ichida, Tsuyoshi Iizuka, Trevor R. Ireland, Akira Ishikawa, Shoichi Itoh, Noriyuki Kawasaki, Noriko T. Kita, Kouki Kitajima, Shintaro Komatani, Alexander N. Krot, Ming-Chang Liu, Yuki Masuda, Mayu Morita, Fréderic Moynier, Kazuko Motomura, Izumi Nakai, Kazuhide Nagashima, Ann Nguyen, Larry Nittler, Morihiko Onose, Andreas Pack, Changkun Park, Laurette Piani, Liping Qin, Sara S. Russell, Naoya Sakamoto, Maria Schönbächler, Lauren Tafla, Haolan Tang, Kentaro Terada, Yasuko Terada, Tomohiro Usui, Sohei Wada, Meenakshi Wadhwa, Richard J. Walker, Katsuyuki Yamashita, Qing-Zhu Yin, Shigekazu Yoneda, Edward D. Young, Hiroharu Yui, Ai-Cheng Zhang, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Kanako Sakamoto, Hikaru Yabuta, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Tatsuaki Okada, Toru Yada, Kasumi Yogata, Satoru Nakazawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Sei-ichiro Watanabe, Makoto Yoshikawa, Shogo Tachibana, Hisayoshi Yurimoto

Science Advances   2024.9

Breunnerite grain and magnesium isotope chemistry reveal cation partitioning during aqueous alteration of asteroid Ryugu

Toshihiro Yoshimura, Daisuke Araoka, Hiroshi Naraoka, Saburo Sakai, Nanako O. Ogawa, Hisayoshi Yurimoto, Mayu Morita, Morihiko Onose, Tetsuya Yokoyama, Martin Bizzarro, Satoru Tanaka, Naohiko Ohkouchi, Toshiki Koga, Jason P. Dworkin, Tomoki Nakamura, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei-ichiro Watanabe, Yuichi Tsuda, Shogo Tachibana, Yoshinori Takano

Nature Communications   2024.9

Neodymium‐142 deficits and samarium neutron stratigraphy of C‐type asteroid (162173) Ryugu

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, Sachiko Amari, Yuri Amelin, Ken‐ichi Bajo, Martin Bizzarro, Audrey Bouvier, Marc Chaussidon, Byeon‐Gak Choi, Nicolas Dauphas, Andrew M. Davis, Tommaso Di Rocco, Wataru Fujiya, Ryota Fukai, Yuki Hibiya, Hiroshi Hidaka, Hisashi Homma, Peter Hoppe, Gary R. Huss, Kiyohiro Ichida, Tsuyoshi Iizuka, Trevor Ireland, Akira Ishikawa, Shoichi Itoh, Noriyuki Kawasaki, Noriko T. Kita, Koki Kitajima, Thorsten Kleine, Shintaro Komatani, Alexander N. Krot, Ming‐Chang Liu, Yuki Masuda, Kevin D. McKeegan, Mayu Morita, Kazuko Motomura, Frédéric Moynier, Izumi Nakai, Kazuhide Nagashima, Ann Nguyen, Larry Nittler, Morihiko Onose, Andreas Pack, Changkun Park, Laurette Piani, Liping Qin, Sara Russell, Naoya Sakamoto, Maria Schönbächler, Lauren Tafla, Haolan Tang, Kentaro Terada, Yasuko Terada, Tomohiro Usui, Sohei Wada, Meenakshi Wadhwa, Richard J. Walker, Katsuyuki Yamashita, Qing‐Zhu Yin, Shigekazu Yoneda, Edward D. Young, Hiroharu Yui, Ai‐Cheng Zhang, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Kanako Sakamoto, Hikaru Yabuta, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Tatsuaki Okada, Toru Yada, Kasumi Yogata, Satoru Nakazawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Sei‐ichiro Watanabe, Makoto Yoshikawa, Shogo Tachibana, Hisayoshi Yurimoto

Meteoritics & Planetary Science   2024.8

Pervasive aqueous alteration in the early Solar System revealed by potassium isotopic variations in Ryugu samples and carbonaceous chondrites

Yan Hu, Frédéric Moynier, Wei Dai, Marine Paquet, Tetsuya Yokoyama, Yoshinari Abe, Jérôme Aléon, Conel M.O.D. Alexander, Sachiko Amari, Yuri Amelin, Ken ichi Bajo, Martin Bizzarro, Audrey Bouvier, Richard W. Carlson, Marc Chaussidon, Byeon Gak Choi, Nicolas Dauphas, Andrew M. Davis, Tommaso Di Rocco, Wataru Fujiya, Ryota Fukai, Ikshu Gautam, Makiko K. Haba, Yuki Hibiya, Hiroshi Hidaka, Hisashi Homma, Peter Hoppe, Gary R. Huss, Kiyohiro Ichida, Tsuyoshi Iizuka, Trevor R. Ireland, Akira Ishikawa, Shoichi Itoh, Noriyuki Kawasaki, Noriko T. Kita, Koki Kitajima, Thorsten Kleine, Shintaro Komatani, Alexander N. Krot, Ming Chang Liu, Yuki Masuda, Mayu Morita, Kazuko Motomura, Izumi Nakai, Kazuhide Nagashima, David Nesvorný, Ann Nguyen, Larry Nittler, Morihiko Onose, Andreas Pack, Changkun Park, Laurette Piani, Liping Qin, Sara S. Russell, Naoya Sakamoto, Maria Schönbächler, Lauren Tafla, Haolan Tang, Kentaro Terada, Yasuko Terada, Tomohiro Usui, Sohei Wada, Meenakshi Wadhwa, Richard J. Walker, Katsuyuki Yamashita, Qing Zhu Yin, Shigekazu Yoneda, Edward D. Young, Hiroharu Yui, Ai Cheng Zhang, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Kanako Sakamoto, Hikaru Yabuta, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Tatsuaki Okada, Toru Yada, Kasumi Yogata, Satoru Nakazawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Sei ichiro Watanabe, Makoto Yoshikawa, Shogo Tachibana, Hisayoshi Yurimoto

Icarus   409   2024.2

Analysis of Cation Composition in Dolomites on the Intact Particles Sampled from Asteroid Ryugu

Mayu Morita, Hiroharu Yui, Shu Hei Urashima, Morihiko Onose, Shintaro Komatani, Izumi Nakai, Yoshinari Abe, Yasuko Terada, Hisashi Homma, Kazuko Motomura, Kiyohiro Ichida, Tetsuya Yokoyama, Kazuhide Nagashima, Jérôme Aléon, Conel M. Conel, Sachiko Amari, Yuri Amelin, Ken Ichi Bajo, Martin Bizzarro, Audrey Bouvier, Richard W. Carlson, Marc Chaussidon, Byeon Gak Choi, Nicolas Dauphas, Andrew M. Davis, Wataru Fujiya, Ryota Fukai, Ikshu Gautam, Makiko K. Haba, Yuki Hibiya, Hiroshi Hidaka, Peter Hoppe, Gary R. Huss, Tsuyoshi Iizuka, Trevor R. Ireland, Akira Ishikawa, Shoichi Itoh, Noriyuki Kawasaki, Noriko T. Kita, Kouki Kitajima, Thorsten Kleine, Sasha Krot, Ming Chang Liu, Yuki Masuda, Frédéric Moynier, Ann Nguyen, Larry Nittler, Andreas Pack, Changkun Park, Laurette Piani, Liping Qin, Tommaso Di Rocco, Sara S. Russell, Naoya Sakamoto, Maria Schönbächler, Lauren Tafla, Haolan Tang, Kentaro Terada, Tomohiro Usui, Sohei Wada, Meenakshi Wadhwa, Richard J. Walker, Katsuyuki Yamashita, Qing Zhu Yin, Shigekazu Yoneda, Edward D. Young, Ai Cheng Zhang, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Kanako Sakamoto, Hikaru Yabuta, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Tatsuaki Okada, Toru Yada, Kasumi Yogata, Satoru Nakazawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Sei Ichiro Watanabe, Makoto Yoshikawa, Shogo Tachibana, Hisayoshi Yurimoto

Analytical Chemistry   96 ( 1 )   170 - 178   2024.1

Distribution analysis of rare earth elements in fine-grained CAIs of the Allende meteorite using multiple-spot femtosecond LA-ICP-MS

Yuki Masuda, Sota Niki, Takafumi Hirata, Tetsuya Yokoyama

Meteoritics and Planetary Science   2024

Disequilibrium oxygen isotope distribution among aqueously altered minerals in Ryugu asteroid returned samples

Noriko T. Kita, Kouki Kitajima, Kazuhide Nagashima, Noriyuki Kawasaki, Naoya Sakamoto, Wataru Fujiya, Yoshinari Abe, Jérôme Aléon, Conel M.O.D. Alexander, Sachiko Amari, Yuri Amelin, Ken ichi Bajo, Martin Bizzarro, Audrey Bouvier, Richard W. Carlson, Marc Chaussidon, Byeon Gak Choi, Nicolas Dauphas, Andrew M. Davis, Tommaso Di Rocco, Ryota Fukai, Ikshu Gautam, Makiko K. Haba, Yuki Hibiya, Hiroshi Hidaka, Hisashi Homma, Peter Hoppe, Gary R. Huss, Kiyohiro Ichida, Tsuyoshi Iizuka, Trevor R. Ireland, Akira Ishikawa, Shoichi Itoh, Thorsten Kleine, Shintaro Komatani, Alexander N. Krot, Ming Chang Liu, Yuki Masuda, Kevin D. McKeegan, Mayu Morita, Kazuko Motomura, Frédéric Moynier, Izumi Nakai, Ann Nguyen, Larry Nittler, Morihiko Onose, Andreas Pack, Changkun Park, Laurette Piani, Liping Qin, Sara S. Russell, Maria Schönbächler, Lauren Tafla, Haolan Tang, Kentaro Terada, Yasuko Terada, Tomohiro Usui, Sohei Wada, Meenakshi Wadhwa, Richard J. Walker, Katsuyuki Yamashita, Qing Zhu Yin, Tetsuya Yokoyama, Shigekazu Yoneda, Edward D. Young, Hiroharu Yui, Ai Cheng Zhang, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Kanako Sakamoto, Hikaru Yabuta, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Tatsuaki Okada, Toru Yada, Kasumi Yogata, Satoru Nakazawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Sei ichiro Watanabe, Makoto Yoshikawa, Shogo Tachibana, Hisayoshi Yurimoto

Meteoritics and Planetary Science   2024

Hydrogen in magnetite from asteroid Ryugu

J. Aléon, S. Mostefaoui, H. Bureau, D. Vangu, H. Khodja, K. Nagashima, N. Kawasaki, Y. Abe, C. M.O.d. Alexander, S. Amari, Y. Amelin, K. Bajo, M. Bizzarro, A. Bouvier, R. W. Carlson, M. Chaussidon, B. G. Choi, N. Dauphas, A. M. Davis, T. Di Rocco, W. Fujiya, R. Fukai, I. Gautam, M. K. Haba, Y. Hibiya, H. Hidaka, H. Homma, P. Hoppe, G. R. Huss, K. Ichida, T. Iizuka, T. R. Ireland, A. Ishikawa, S. Itoh, N. T. Kita, K. Kitajima, T. Kleine, S. Komatani, A. N. Krot, M. C. Liu, Y. Masuda, M. Morita, K. Motomura, F. Moynier, I. Nakai, A. Nguyen, L. R. Nittler, M. Onose, A. Pack, C. Park, L. Piani, L. Qin, S. S. Russell, N. Sakamoto, M. Schönbächler, L. Tafla, H. Tang, K. Terada, Y. Terada, T. Usui, S. Wada, M. Wadhwa, R. J. Walker, K. Yamashita, Q. Z. Yin, T. Yokoyama, S. Yoneda, E. D. Young, H. Yui, A. C. Zhang, T. Nakamura, H. Naraoka, T. Noguchi, R. Okazaki, K. Sakamoto, H. Yabuta, M. Abe, A. Miyazaki, A. Nakato, M. Nishimura, T. Okada, T. Yada, K. Yogata, S. Nakazawa, T. Saiki, S. Tanaka, F. Terui, Y. Tsuda, S. Watanabe, M. Yoshikawa, S. Tachibana, H. Yurimoto

Meteoritics and Planetary Science   2024

Pyrrhotites in asteroid 162173 Ryugu: Records of the initial changes on their surfaces with aqueous alteration

Tetsuya Yokoyama

Geochimica et Cosmochimica Acta   2024

Applicability of quartz tube digestion for the determination of highly siderophile and volatile chalcophile element abundances with Os isotopic compositions using ICP-MS/MS and N-TIMS

Ryo Fujita, Shun Nakano, Tetsuya Yokoyama, Akira Ishikawa

GEOCHEMICAL JOURNAL   2024

Molybdenum isotopic compositions in volcanic rocks from Northern Izu arc (Izu-Oshima, Niijima, and Kozushima)

Tatsuya Tamura, Tetsuya Yokoyama, Takeshi Kuritani, Akira Ishikawa

GEOCHEMICAL JOURNAL   2024

The Magnesium Isotope Composition of Samples Returned from Asteroid Ryugu

Martin Bizzarro, Martin Schiller, Tetsuya Yokoyama, Yoshinari Abe, Jérôme Aléon, Conel M. Alexander, Sachiko Amari, Yuri Amelin, Ken Ichi Bajo, Audrey Bouvier, Richard W. Carlson, Marc Chaussidon, Byeon Gak Choi, Nicolas Dauphas, Andrew M. Davis, Tommaso Di Rocco, Wataru Fujiya, Ryota Fukai, Ikshu Gautam, Makiko K. Haba, Yuki Hibiya, Hiroshi Hidaka, Hisashi Homma, Peter Hoppe, Gary R. Huss, Kiyohiro Ichida, Tsuyoshi Iizuka, Trevor R. Ireland, Akira Ishikawa, Shoichi Itoh, Noriyuki Kawasaki, Noriko T. Kita, Kouki Kitajima, Thorsten Kleine, Shintaro Komatani, Alexander N. Krot, Ming Chang Liu, Yuki Masuda, Mayu Morita, Fréderic Moynier, Kazuko Motomura, Izumi Nakai, Kazuhide Nagashima, David Nesvorný, Ann Nguyen, Larry Nittler, Morihiko Onose, Andreas Pack, Changkun Park, Laurette Piani, Liping Qin, Sara S. Russell, Naoya Sakamoto, Maria Schönbächler, Lauren Tafla, Haolan Tang, Kentaro Terada, Yasuko Terada, Tomohiro Usui, Sohei Wada, Meenakshi Wadhwa, Richard J. Walker, Katsuyuki Yamashita, Qing Zhu Yin, Shigekazu Yoneda, Edward D. Young, Hiroharu Yui, Ai Cheng Zhang, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Kanako Sakamoto, Hikaru Yabuta, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Tatsuaki Okada, Toru Yada, Kasumi Yogata, Satoru Nakazawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Sei Ichiro Watanabe, Makoto Yoshikawa, Shogo Tachibana, Hisayoshi Yurimoto

Astrophysical Journal Letters   958 ( 2 )   2023.12

Nucleosynthetic s-Process Depletion in Mo from Ryugu samples returned by Hayabusa2

N. Nakanishi, T. Yokoyama, A. Ishikawa, R.J. Walker, Y. Abe, J. Aléon, C.M.O'D. Alexander, S. Amari, Y. Amelin, K.-I. Bajo, M. Bizzarro, A. Bouvier, R.W. Carlson, M. Chaussidon, B.-G. Choi, N. Dauphas, A.M. Davis, T. Di Rocco, W. Fujiya, R. Fukai, I. Gautam, M.K. Haba, Y. Hibiya, H. Hidaka, H. Homma, P. Hoppe, G.R. Huss, K. Ichida, T. Iizuka, T.R. Ireland, S. Itoh, N. Kawasaki, N.T. Kita, K. Kitajima, T. Kleine, S. Komatani, A.N. Krot, M.-C. Liu, Y. Masuda, M. Morita, K. Motomura, F. Moynier, I. Nakai, K. Nagashima, A. Nguyen, L. Nittler, M. Onose, A. Pack, C. Park, L. Piani, L. Qin

Geochemical Perspectives Letters   2023.12

Water circulation in Ryugu asteroid affected the distribution of nucleosynthetic isotope anomalies in returned sample

Tetsuya Yokoyama, Meenakshi Wadhwa, Tsuyoshi Iizuka, Vinai Rai, Ikshu Gautam, Yuki Hibiya, Yuki Masuda, Makiko K. Haba, Ryota Fukai, Rebekah Hines, Nicole Phelan, Yoshinari Abe, Jérôme Aléon, Conel M. O’D. Alexander, Sachiko Amari, Yuri Amelin, Ken-ichi Bajo, Martin Bizzarro, Audrey Bouvier, Richard W. Carlson, Marc Chaussidon, Byeon-Gak Choi, Nicolas Dauphas, Andrew M. Davis, Tommaso Di Rocco, Wataru Fujiya, Hiroshi Hidaka, Hisashi Homma, Peter Hoppe, Gary R. Huss, Kiyohiro Ichida, Trevor Ireland, Akira Ishikawa, Shoichi Itoh, Noriyuki Kawasaki, Noriko T. Kita, Koki Kitajima, Thorsten Kleine, Shintaro Komatani, Alexander N. Krot, Ming-Chang Liu, Kevin D. McKeegan, Mayu Morita, Kazuko Motomura, Frédéric Moynier, Izumi Nakai, Kazuhide Nagashima, Ann Nguyen, Larry Nittler, Morihiko Onose, Andreas Pack, Changkun Park, Laurette Piani, Liping Qin, Sara Russell, Naoya Sakamoto, Maria Schönbächler, Lauren Tafla, Haolan Tang, Kentaro Terada, Yasuko Terada, Tomohiro Usui, Sohei Wada, Richard J. Walker, Katsuyuki Yamashita, Qing-Zhu Yin, Shigekazu Yoneda, Edward D. Young, Hiroharu Yui, Ai-Cheng Zhang, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Kanako Sakamoto, Hikaru Yabuta, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Tatsuaki Okada, Toru Yada, Kasumi Yogata, Satoru Nakazawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Sei-ichiro Watanabe, Makoto Yoshikawa, Shogo Tachibana, Hisayoshi Yurimoto

Science Advances   2023.11

Identification of carbonate-associated sulfate (CAS) in a Noachian Martian meteorite Allan Hills 84001

Tetsuya Yokoyama

Earth and Planetary Science Letters   620   118345 - 118345   2023.10

The Oxygen Isotopic Composition of Samples Returned from Asteroid Ryugu with Implications for the Nature of the Parent Planetesimal

Haolan Tang, Edward D. Young, Lauren Tafla, Andreas Pack, Tommaso Di Rocco, Yoshinari Abe, Jérôme Aléon, Conel M.O.D. Alexander, Sachiko Amari, Yuri Amelin, Ken Ichi Bajo, Martin Bizzarro, Audrey Bouvier, Richard W. Carlson, Marc Chaussidon, Byeon Gak Choi, Nicolas Dauphas, Andrew M. Davis, Wataru Fujiya, Ryota Fukai, Ikshu Gautam, Makiko K. Haba, Yuki Hibiya, Hiroshi Hidaka, Hisashi Homma, Peter Hoppe, Gary R. Huss, Kiyohiro Ichida, Tsuyoshi Iizuka, Trevor R. Ireland, Akira Ishikawa, Motoo Ito, Shoichi Itoh, Noriyuki Kawasaki, Noriko T. Kita, Kouki Kitajima, Thorsten Kleine, Shintaro Komatani, Alexander N. Krot, Ming Chang Liu, Yuki Masuda, Kevin D. McKeegan, Mayu Morita, Kazuko Motomura, Frédéric Moynier, Kazuhide Nagashima, Izumi Nakai, Ann Nguyen, Larry Nittler, Morihiko Onose, Changkun Park, Laurette Piani, Liping Qin, Sara S. Russell, Naoya Sakamoto, Maria Schönbächler, Kentaro Terada, Yasuko Terada, Tomohiro Usui, Sohei Wada, Meenakshi Wadhwa, Richard J. Walker, Katsuyuki Yamashita, Qing Zhu Yin, Tetsuya Yokoyama, Shigekazu Yoneda, Hiroharu Yui, Ai Cheng Zhang, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Kanako Sakamoto, Hikaru Yabuta, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Tatsuaki Okada, Toru Yada, Kasumi Yogata, Satoru Nakazawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Sei Ichiro Watanabe, Makoto Yoshikawa, Shogo Tachibana, Hisayoshi Yurimoto

Planetary Science Journal   4 ( 8 )   2023.8

Evaluation of the Residual Mass Fractionation in High‐Precision Cr Isotopic Analysis with TIMS

Tetsuya Yokoyama, Yusuke Ohkuma, Keiji Nishikawa, Koki Sumiya, Ikshu Gautam

Geostandards and Geoanalytical Research   47 ( 2 )   2023.6

Hydrogen Isotopic Composition of Hydrous Minerals in Asteroid Ryugu

Laurette Piani, Kazuhide Nagashima, Noriyuki Kawasaki, Naoya Sakamoto, Ken-ichi Bajo, Yoshinari Abe, Jérôme Aléon, Conel M.O'D. Alexander, Sachiko Amari, Yuri Amelin, Martin Bizzarro, Audrey Bouvier, Richard Carlson, Marc Chaussidon, Byeon-Gak Choi, Nicolas Dauphas, Andrew Davis, Tommaso Di Rocco, Wataru Fujiya, Ryota Fukai, Ikshu Gautam, Makiko K. Haba, Yuki Hibiya, Hiroshi Hidaka, Hisashi HOMMA, Peter Hoppe, Gary Huss, Kiyohiro Ichida, Tsuyoshi IIZUKA, Trevor R. Ireland, Akira Ishikawa, Shoichi Itoh, Noriko T. Kita, Kouki Kitajima, Thorsten Kleine, Shintaro Komatani, Alexander N. Krot, Ming-Chang Liu, Yuki Masuda, Kevin D. McKeegan, 麻由 森田, kazuko motomura, Frédéric Moynier, Izumi Nakai, Ann Nguyen, Larry Nittler, Morihiko Onose, Andreas Pack, Changkun Park, Liping Qin, Sara S. Russell

The Astrophysical Journal Letters   946 ( 2 )   2023.4

Strontium isotope evidence for the repeated formation of refractory inclusions in the Allende meteorite

Yuki Masuda, Tetsuya Yokoyama

Geochimica et Cosmochimica Acta   345   2023.3

Samples returned from the asteroid Ryugu are similar to Ivuna-type carbonaceous meteorites Reviewed

Tetsuya Yokoyama, Kazuhide Nagashima, Izumi Nakai, Edward D. Young, Yoshinari Abe, Jérôme Aléon, Conel M. O’D. Alexander, Sachiko Amari, Yuri Amelin, Ken-ichi Bajo, Martin Bizzarro, Audrey Bouvier, Richard W. Carlson, Marc Chaussidon, Byeon-Gak Choi, Nicolas Dauphas, Andrew M. Davis, Tommaso Di Rocco, Wataru Fujiya, Ryota Fukai, Ikshu Gautam, Makiko K. Haba, Yuki Hibiya, Hiroshi Hidaka, Hisashi Homma, Peter Hoppe, Gary R. Huss, Kiyohiro Ichida, Tsuyoshi Iizuka, Trevor R. Ireland, Akira Ishikawa, Motoo Ito, Shoichi Itoh, Noriyuki Kawasaki, Noriko T. Kita, Kouki Kitajima, Thorsten Kleine, Shintaro Komatani, Alexander N. Krot, Ming-Chang Liu, Yuki Masuda, Kevin D. McKeegan, Mayu Morita, Kazuko Motomura, Frédéric Moynier, Ann Nguyen, Larry Nittler, Morihiko Onose, Andreas Pack, Changkun Park, Laurette Piani, Liping Qin, Sara S. Russell, Naoya Sakamoto, Maria Schönbächler, Lauren Tafla, Haolan Tang, Kentaro Terada, Yasuko Terada, Tomohiro Usui, Sohei Wada, Meenakshi Wadhwa, Richard J. Walker, Katsuyuki Yamashita, Qing-Zhu Yin, Shigekazu Yoneda, Hiroharu Yui, Ai-Cheng Zhang, Harold C. Connolly, Jr., Dante S. Lauretta, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Kanako Sakamoto, Hikaru Yabuta, Masanao Abe, 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, Tatsuaki Okada, Chisato Okamoto, Go Ono, Masanobu Ozaki, Takanao Saiki, Naoya Sakatani, Hirotaka Sawada, Hiroki Senshu, Yuri Shimaki, Kei Shirai, Seiji Sugita, Yuto Takei, Hiroshi Takeuchi, Satoshi Tanaka, Eri Tatsumi, Fuyuto Terui, Yuichi Tsuda, Ryudo Tsukizaki, Koji Wada, Sei-ichiro Watanabe, Manabu Yamada, Tetsuya Yamada, Yukio Yamamoto, Hajime Yano, Yasuhiro Yokota, Keisuke Yoshihara, Makoto Yoshikawa, Kent Yoshikawa, Shizuho Furuya, Kentaro Hatakeda, Tasuku Hayashi, Yuya Hitomi, Kazuya Kumagai, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Hiromichi Soejima, Ayako Suzuki, Toru Yada, Daiki Yamamoto, Kasumi Yogata, Miwa Yoshitake, Shogo Tachibana, Hisayoshi Yurimoto

Science   2023.2

Contribution of Ryugu-like material to Earth’s volatile inventory by Cu and Zn isotopic analysis

Marine Paquet, Frederic Moynier, Tetsuya Yokoyama, Wei Dai, Yan Hu, Yoshinari Abe, Jérôme Aléon, Conel M. Conel, Sachiko Amari, Yuri Amelin, Ken ichi Bajo, Martin Bizzarro, Audrey Bouvier, Richard W. Carlson, Marc Chaussidon, Byeon Gak Choi, Nicolas Dauphas, Andrew M. Davis, Tommaso Di Rocco, Wataru Fujiya, Ryota Fukai, Ikshu Gautam, Makiko K. Haba, Yuki Hibiya, Hiroshi Hidaka, Hisashi Homma, Peter Hoppe, Gary R. Huss, Kiyohiro Ichida, Tsuyoshi Iizuka, Trevor R. Ireland, Akira Ishikawa, Motoo Ito, Shoichi Itoh, Noriyuki Kawasaki, Noriko T. Kita, Kouki Kitajima, Thorsten Kleine, Shintaro Komatani, Alexander N. Krot, Ming Chang Liu, Yuki Masuda, Kevin D. McKeegan, Mayu Morita, Kazuko Motomura, Izumi Nakai, Kazuhide Nagashima, David Nesvorný, Ann N. Nguyen, Larry Nittler, Morihiko Onose, Andreas Pack, Changkun Park, Laurette Piani, Liping Qin, Sara S. Russell, Naoya Sakamoto, Maria Schönbächler, Lauren Tafla, Haolan Tang, Kentaro Terada, Yasuko Terada, Tomohiro Usui, Sohei Wada, Meenakshi Wadhwa, Richard J. Walker, Katsuyuki Yamashita, Qing Zhu Yin, Shigekazu Yoneda, Edward D. Young, Hiroharu Yui, Ai Cheng Zhang, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Kanako Sakamoto, Hikaru Yabuta, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Tatsuaki Okada, Toru Yada, Kasumi Yogata, Satoru Nakazawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Sei ichiro Watanabe, Makoto Yoshikawa, Shogo Tachibana, Hisayoshi Yurimoto

Nature Astronomy   7 ( 2 )   182 - 189   2023.2

Chemical evolution of primordial salts and organic sulfur molecules in the asteroid 162173 Ryugu

Yoshimura, T., Takano, Y., Naraoka, H., Koga, T., Araoka, D., Ogawa, N.O., Schmitt-Kopplin, P., Hertkorn, N., Oba, Y., Dworkin, J.P., Aponte, J.C., Yoshikawa, T., Tanaka, S., Ohkouchi, N., Hashiguchi, M., McLain, H., Parker, E.T., Sakai, S., Yamaguchi, M., Suzuki, T., Yokoyama, T., Yurimoto, H., Nakamura, T., Noguchi, T., Okazaki, R., Yabuta, H., Sakamoto, K., Yada, T., Nishimura, M., Nakato, A., Miyazaki, A., Yogata, K., Abe, M., Okada, T., Usui, T., Yoshikawa, M., Saiki, T., Tanaka, S., Terui, F., Nakazawa, S., Watanabe, S.-I., Tsuda, Y., Tachibana, S., Hamase, K., Furusho, A., Fukushima, K., Aoki, D., Glavin, D.P., McLain, H.L., Elsila, J.E., Graham, H.V., Eiler, J.M., Ruf, A., Orthous-Daunay, F.-R., Wolters, C., Isa, J., Vuitton, V., Thissen, R., Sugahara, H., Mita, H., Furukawa, Y., Chikaraishi, Y., Morita, M., Onose, M., Kabashima, F., Fujishima, K., Sato, H., Sasaki, K., Kano, K., Nomura, S.-I.M., Aoki, J., Yamazaki, T., Kimura, Y.

Nature Communications   14 ( 1 )   2023

Molybdenum isotopic compositions in NE Japan in rear arc

Tatsuya Tamura, Tetsuya Yokoyama, Gill James, Hikaru Iwamori, Takeshi Kuritani, Kenta Ueki

Abstracts of Annual Meeting of the Geochemical Society of Japan   70   156   2023

Abundant presolar grains and primordial organics preserved in carbon-rich exogenous clasts in asteroid Ryugu

Nguyen, A.N., Mane, P., Keller, L.P., Piani, L., Abe, Y., Al{\'e}on, J., Alex, er, C.M.O?.D., Amari, S., Amelin, Y., Bajo, K.-I., Bizzarro, M., Bouvier, A., Carlson, R.W., Chaussidon, M., Choi, B.-G., Dauphas, N., Davis, A.M., Di Rocco, T., Fujiya, W., Fukai, R., Gautam, I., Haba, M.K., Hibiya, Y., Hidaka, H., Homma, H., Hoppe, P., Huss, G.R., Ichida, K., Iizuka, T., Irel, , T.R., Ishikawa, A., Itoh, S., Kawasaki, N., Kita, N.T., Kitajima, K., Kleine, T., Komatani, S., Krot, A.N., Liu, M.-C., Masuda, Y., McKeegan, K.D., Morita, M., Motomura, K., Moynier, F., Nakai, I., Nagashima, K., Nesvorn?, D., Nittler, L., Onose, M., Pack, A., Park, C., Qin, L., Russell, S.S., Sakamoto, N., Sch{\"o}nb{\"a}chler, M., Tafla, L., Tang, H., Terada, K., Terada, Y., Usui, T., Wada, S., Wadhwa, M., Walker, R.J., Yamashita, K., Yin, Q.-Z., Yokoyama, T., Yoneda, S., Young, E.D., Yui, H., Zhang, A.-C., Nakamura, T., Naraoka, H., Noguchi, T., Okazaki, R., Sakamoto, K., Yabuta, H., Abe, M., Miyazaki, A., Nakato, A., Nishimura, M., Okada, T., Yada, T., Yogata, K., Nakazawa, S., Saiki, T., Tanaka, S., Terui, F., Tsuda, Y., Watanabe, S.-I., Yoshikawa, M., Tachibana, S., Yurimoto, H.

Science Advances   9 ( 28 )   2023

Carbonate record of temporal change in oxygen fugacity and gaseous species in asteroid Ryugu

Fujiya, W., Kawasaki, N., Nagashima, K., Sakamoto, N., O?D. Alex, er, C.M., Kita, N.T., Kitajima, K., Abe, Y., Al{\'e}on, J., Amari, S., Amelin, Y., Bajo, K.-I., Bizzarro, M., Bouvier, A., Carlson, R.W., Chaussidon, M., Choi, B.-G., Dauphas, N., Davis, A.M., Di Rocco, T., Fukai, R., Gautam, I., Haba, M.K., Hibiya, Y., Hidaka, H., Homma, H., Hoppe, P., Huss, G.R., Ichida, K., Iizuka, T., Irel, , T.R., Ishikawa, A., Itoh, S., Kleine, T., Komatani, S., Krot, A.N., Liu, M.-C., Masuda, Y., McKeegan, K.D., Morita, M., Motomura, K., Moynier, F., Nakai, I., Nguyen, A., Nittler, L., Onose, M., Pack, A., Park, C., Piani, L., Qin, L., Russell, S.S., Sch{\"o}nb{\"a}chler, M., Tafla, L., Tang, H., Terada, K., Terada, Y., Usui, T., Wada, S., Wadhwa, M., Walker, R.J., Yamashita, K., Yin, Q.-Z., Yokoyama, T., Yoneda, S., Young, E.D., Yui, H., Zhang, A.-C., Nakamura, T., Naraoka, H., Noguchi, T., Okazaki, R., Sakamoto, K., Yabuta, H., Abe, M., Miyazaki, A., Nakato, A., Nishimura, M., Okada, T., Yada, T., Yogata, K., Nakazawa, S., Saiki, T., Tanaka, S., Terui, F., Tsuda, Y., Watanabe, S.-I., Yoshikawa, M., Tachibana, S., Yurimoto, H.

Nature Geoscience   16 ( 8 )   2023

Author Correction: Contribution of Ryugu-like material to Earth’s volatile inventory by Cu and Zn isotopic analysis (Nature Astronomy, (2022), 7, 2, (182-189), 10.1038/s41550-022-01846-1)

Paquet, M., Moynier, F., Yokoyama, T., Dai, W., Hu, Y., Abe, Y., Al{\'e}on, J., O?D. Alex, er, C.M., Amari, S., Amelin, Y., Bajo, K.-I., Bizzarro, M., Bouvier, A., Carlson, R.W., Chaussidon, M., Choi, B.-G., Dauphas, N., Davis, A.M., Di Rocco, T., Fujiya, W., Fukai, R., Gautam, I., Haba, M.K., Hibiya, Y., Hidaka, H., Homma, H., Hoppe, P., Huss, G.R., Ichida, K., Iizuka, T., Irel, , T.R., Ishikawa, A., Ito, M., Itoh, S., Kawasaki, N., Kita, N.T., Kitajima, K., Kleine, T., Komatani, S., Krot, A.N., Liu, M.-C., Masuda, Y., McKeegan, K.D., Morita, M., Motomura, K., Nakai, I., Nagashima, K., Nesvorn?, D., Nguyen, A.N., Nittler, L., Onose, M., Pack, A., Park, C., Piani, L., Qin, L., Russell, S.S., Sakamoto, N., Sch{\"o}nb{\"a}chler, M., Tafla, L., Tang, H., Terada, K., Terada, Y., Usui, T., Wada, S., Wadhwa, M., Walker, R.J., Yamashita, K., Yin, Q.-Z., Yoneda, S., Young, E.D., Yui, H., Zhang, A.-C., Nakamura, T., Naraoka, H., Noguchi, T., Okazaki, R., Sakamoto, K., Yabuta, H., Abe, M., Miyazaki, A., Nakato, A., Nishimura, M., Okada, T., Yada, T., Yogata, K., Nakazawa, S., Saiki, T., Tanaka, S., Terui, F., Tsuda, Y., Watanabe, S.-I., Yoshikawa, M., Tachibana, S., Yurimoto, H.

Nature Astronomy   7 ( 5 )   633 - 633   2023

Oxygen isotopes of anhydrous primary minerals show kinship between asteroid Ryugu and comet 81P/Wild2

Noriyuki Kawasaki, Kazuhide Nagashima, Naoya Sakamoto, Toru Matsumoto, Ken-ichi Bajo, Sohei Wada, Yohei Igami, Akira Miyake, Takaaki Noguchi, Daiki Yamamoto, Sara Russell, Yoshinari Abe, Jérôme Aléon, Conel M.O'D. Alexander, Sachiko Amari, Yuri Amelin, Martin Bizzarro, Audrey Bouvier, Richard Carlson, Marc Chaussidon, Byeon-Gak Choi, Nicolas Dauphas, Andrew Davis, Tommaso Di Rocco, Wataru Fujiya, Ryota Fukai, Ikshu Gautam, Makiko K. Haba, Yuki Hibiya, Hiroshi Hidaka, Hisashi HOMMA, Peter Hoppe, Gary Huss, 青大 市田, Tsuyoshi IIZUKA, Trevor Ireland, Akira Ishikawa, Motoo Ito, Shoichi Itoh, Noriko T. Kita, Kouki Kitajima, Thorsten Kleine, 慎太郎 駒谷, Alexander Krot, Ming-Chang Liu, Yuki Masuda, Kevin D. McKeegan, 麻由 森田, kazuko motomura, Frederic Moynier, Izumi Nakai

Science Advances   8 ( 50 )   2022.12

Ryugu’s nucleosynthetic heritage from the outskirts of the Solar System

Timo Hopp, Nicolas Dauphas, Yoshinari Abe, Jérôme Aléon, Conel M.O'D. Alexander, Sachiko Amari, Yuri Amelin, Ken-ichi Bajo, Martin Bizzarro, Audrey Bouvier, Richard Carlson, Marc Chaussidon, Byeon-Gak Choi, Andrew Davis, Tommaso Di Rocco, Wataru Fujiya, Ryota Fukai, Ikshu Gautam, Makiko K. Haba, Yuki Hibiya, Hiroshi Hidaka, Hisashi HOMMA, Peter Hoppe, Gary Huss, 青大 市田, Tsuyoshi IIZUKA, Trevor Ireland, Akira Ishikawa, Motoo Ito, Shoichi Itoh, Noriyuki Kawasaki, Noriko T. Kita, Kouki Kitajima, Thorsten Kleine, 慎太郎 駒谷, Alexander Krot, Ming-Chang Liu, Yuki Masuda, Kevin D. McKeegan, 麻由 森田, kazuko motomura, Frederic Moynier, Izumi Nakai, Kazuhide Nagashima, David Nesvorny, Ann Nguyen, Larry Nittler, Morihiko Onose, Andreas Pack, Changkun Park, Laurette Piani

Science Advances   8 ( 46 )   2022.11

The Solar System calcium isotopic composition inferred from Ryugu samples Reviewed

F. Moynier, W. Dai, T. Yokoyama, Y. Hu, M. Paquet, Y. Abe, J. Aléon, C.M.O'D Alexander, S. Amari, Y. Amelin, K.-I. Bajo, M. Bizzarro, A. Bouvier, R.W. Carlson, M. Chaussidon, B.-G. Choi, N. Dauphas, A.M. Davis, T. Di Rocco, W. Fujiya, R. Fukai, I. Gautam, M.K. Haba, Y. Hibiya, H. Hidaka, H. Homma, P. Hoppe, G.R. Huss, K. Ichida, T. Iizuka, T.R. Ireland, A. Ishikawa, M. Ito, S. Itoh, N. Kawasaki, N.T. Kita, K. Kitajima, T. Kleine, S. Komatani, A.N. Krot, M.-C. Liu, Y. Masuda, K.D. McKeegan, M. Morita, K. Motomura, I. Nakai, K. Nagashima, D. Nesvorný, A. Nguyen, L. Nittler, M. Onose, A. Pack, C. Park, L. Piani, L. Qin, S.S. Russell, N. Sakamoto, M. Schönbächler, L. Tafla, H. Tang, K. Terada, Y. Terada, T. Usui, S. Wada, M. Wadhwa, R.J. Walker, K. Yamashita, Q.-Z. Yin, S. Yoneda, E.D. Young, H. Yui, A.-C. Zhang, T. Nakamura, H. Naraoka, T. Noguchi, R. Okazaki, K. Sakamoto, H. Yabuta, M. Abe, A. Miyazaki, A. Nakato, M. Nishimura, T. Okada, T. Yada, K. Yogata, S. Nakazawa, T. Saiki, S. Tanaka, F. Terui, Y. Tsuda, S.-I. Watanabe, M. Yoshikawa, S. Tachibana, H. Yurimoto

Geochemical Perspectives Letters   24   1 - 6   2022.10

Presolar Stardust in Asteroid Ryugu

Jens Barosch, Larry Nittler, Jianhua Wang, Conel M.O'D. Alexander, Bradley De Gregorio, Cecile Engrand, Yoko Kebukawa, Kazuhide Nagashima, R. M. Stroud, Hikaru Yabuta, Yoshinari Abe, Jérôme Aléon, Sachiko Amari, Yuri Amelin, Ken-ichi Bajo, Laure Bejach, Martin Bizzarro, Lydie Bonal, Audrey Bouvier, Richard Carlson, Marc Chaussidon, Byeon-Gak Choi, George Cody, Emmanuel Dartois, Nicolas Dauphas, Andrew Davis, Alexandre Dazzi, Ariane Deniset-Besseau, Tommaso Di Rocco, Jean Duprat, Wataru Fujiya, Ryota Fukai, Ikshu Gautam, Makiko K. Haba, Minako Hashiguchi, Yuki Hibiya, Hiroshi Hidaka, Hisashi Homma, Peter Hoppe, Gary Huss, Kiyohiro Ichida, Tsuyoshi Iizuka, Trevor Ireland, Akira Ishikawa, Motoo Ito, Shoichi Itoh, Kanami Kamide, Noriyuki Kawasaki, Arthur Kilcoyne, Noriko T. Kita, Kouki Kitajima

The Astrophysical Journal Letters   935 ( 1 )   2022.8

Chemical and Isotopic Evaluation of a Microsampling Method using Laser Ablation and Membrane Filter

Yuki Masuda, Tetsuya Yokoyama, Satoki Okabayashi, Akira Ishikawa, Hikaru Iwamori

Geostandards and Geoanalytical Research   46 ( 2 )   205 - 222   2022.6

Geochemical composition of dykes along the Cameroon Line (CL): Petrogenesis and similarities with the Central Atlantic Magmatic Province

Asobo Nkengmatia Elvis Asaah, Tetsuya Yokoyama, Hikaru Iwamori, Festus Tongwa Aka, Jules Tamen, Takeshi Kuritani, Tomohiro Usui, Takeshi Hasegawa, Eric Martial Fozing

Geochemistry   125865 - 125865   2022.1

Simultaneous Determination of Insoluble Fluoride-Forming and High Field-Strength Element Abundances in Rock Samples by ICP-QMS through Isotope Dilution-Internal Standardisation

Saya Kagami, Tetsuya Yokoyama

Geostandards and Geoanalytical Research   45 ( 4 )   679 - 699   2021.12

Tracing the subducting Pacific slab to the mantle transition zone with hydrogen isotopes Reviewed

Takeshi Kuritani, Kenji Shimizu, Takayuki Ushikubo, Qun Ke Xia, Jia Liu, Mitsuhiro Nakagawa, Hajime Taniuchi, Eiichi Sato, Nobuo Doi

Scientific Reports   11 ( 1 )   2021.12

Survey of impact glasses in shergottites searching for Martian sulfate using X-ray absorption near-edge structure

Masashi Shidare, Ryoichi Nakada, Tomohiro Usui, Minato Tobita, Kenji Shimizu, Yoshio Takahashi, Tetsuya Yokoyama

Geochimica et Cosmochimica Acta   313   85 - 98   2021.11

High–μ signature in lavas of Mt. Oku: Implications for lithospheric and asthenospheric contributions to the magmatism of the Cameroon Volcanic Line (West Africa)

A. N.E. Asaah, T. Yokoyama, H. Iwamori, F. T. Aka, T. Kuritani, T. Usui, J. Tamen, M. Gountié Dedzo, B. Chako-Tchamabé, T. Hasegawa, L. A. Nche, T. Ohba

Lithos   400-401   2021.11

Geochemical constraints on the formation of chondrules: Implication from Os and Fe isotopes and HSE abundances in metals from CR chondrites

Nao Nakanishi, Tetsuya Yokoyama, Satoki Okabayashi, Hikaru Iwamori, Takafumi Hirata

Geochimica et Cosmochimica Acta   2021.11

Variable refractory lithophile element compositions of planetary building blocks: Insights from components of enstatite chondrites

Takashi Yoshizaki, Richard D. Ash, Marc D. Lipella, Tetsuya Yokoyama, William F. McDonough

Geochimica et Cosmochimica Acta   308   173 - 187   2021.9

EXAFS Determination of Clay Minerals in Martian Meteorite Allan Hills 84001 and Its Implication for the Noachian Aqueous Environment

Ryoichi Nakada, Gaku Tanabe, Iori Kajitani, Tomohiro Usui, Masashi Shidare, Tetsuya Yokoyama

Minerals   11 ( 2 )   176 - 176   2021.2

A new concept for the genesis of felsic magma: the separation of slab-derived supercritical liquid Reviewed

Hajime Taniuchi, Takeshi Kuritani, Tetsuya Yokoyama, Eizo Nakamura, Mitsuhiro Nakagawa

Scientific Reports   10 ( 1 )   2020.12

Problem of Iron Isotope Composition of the Earth and Moon. Data on δ⁵⁷Fe of Luna 16, Luna 20, and Luna 24 Lunar Soil Samples (Report on the XXII Symposium on the Geochemistry of Stable Isotopes, Moscow, October 29–31, 2019)

E. M. Galimov, S. Okabayashi, T. Yokoyama, T. Hirata, K. Terakado

Geochemistry International   58 ( 11 )   1193 - 1198   2020.11

Magma plumbing system for the Millennium Eruption at Changbaishan volcano, China: Constraints from whole-rock U–Th disequilibrium Reviewed

Takeshi Kuritani, Mitsuhiro Nakagawa, Jumpei Nishimoto, Tetsuya Yokoyama, Tsuyoshi Miyamoto

Lithos   366-367   2020.8

Separation of Heavy Lanthanoids by Flash Column Chromatography for Precise Determination of Er and Yb Isotope Compositions in Rock Samples

Tetsuya Yokoyama, Ryota Fukai, Masaki Nakahara

Geostandards and Geoanalytical Research   44 ( 2 )   265 - 285   2020.6

Compositional heterogeneity of Archean mantle estimated from Sr and Nd isotopic systematics of basaltic rocks from North Pole, Australia, and the Isua supracrustal belt, Greenland Reviewed

Hitomi Nakamura, Ayane Sano, Saya Kagami, Tetsuya Yokoyama, Akira Ishikawa, Tsuyoshi Komiya, Hikaru Iwamori

Precambrian Research   105803 - 105803   2020.6

Geochemically heterogeneous Martian mantle inferred from Pb isotope systematics of depleted shergottites Reviewed

Ryota Moriwaki, Tomohiro Usui, Minato Tobita, Tetsuya Yokoyama

Geochimica et Cosmochimica Acta   274   157 - 171   2020.4

Iron isotopic composition of very low-titanium basalt deduced from the iron isotopic signature in Luna 16, 20, and 24 soils Reviewed

Satoki Okabayashi, Tetsuya Yokoyama, Takafumi Hirata, Kazuo Terakado, Erik M. Galimov

Geochimica et Cosmochimica Acta   269   1 - 14   2020.1

Major/trace elements and Sr–Nd–Pb isotope systematics of lavas from lakes Barombi Mbo and Barombi Koto in the Kumba graben, Cameroon volcanic line: Constraints on petrogenesis

A. N.E. Asaah, T. Yokoyama, F. T. Aka, H. Iwamori, T. Kuritani, T. Usui, M. Gountie Dedzo, J. Tamen, T. Hassegawa, E. M. Fozing, M. J. Wirmvem, A. L. Nche

Journal of African Earth Sciences   161   2020.1

Nucleosynthesis: The Where and How

Yokoyama, T., Tsujimoto, T.

Encyclopedia of Geology: Volume 1-6, Second Edition   5   1 - 19   2020

Geochemistry and Sm-Nd chronology of a Stannern-group eucrite, Northwest Africa 7188

Saya Kagami, Makiko K. Haba, Tetsuya Yokoyama, Tomohiro Usui, Richard C. Greenwood

METEORITICS & PLANETARY SCIENCE   54 ( 11 )   2710 - 2728   2019.11

Origin and Evolution of Distinct Molybdenum Isotopic Variabilities within Carbonaceous and Noncarbonaceous Reservoirs

Tetsuya Yokoyama, Yuichiro Nagai, Ryota Fukai, Takafumi Hirata

ASTROPHYSICAL JOURNAL   883 ( 1 )   2019.9

Nucleosynthetic Sr–Nd Isotope Correlations in Chondrites: Evidence for Nebular Thermal Processing and Dust Transportation in the Early Solar System Reviewed

Ryota Fukai, Tetsuya Yokoyama

The Astrophysical Journal   879 ( 2 )   2019.7

Refinement of the Micro-Distillation Technique for Isotopic Analysis of Geological Samples with pg-Level Osmium Contents

Nao Nakanishi, Tetsuya Yokoyama, Akira Ishikawa

Geostandards and Geoanalytical Research   43 ( 2 )   231 - 243   2019.6

Fractionation of highly siderophile elements in metal grains from unequilibrated ordinary chondrites: Implications for the origin of chondritic metals Reviewed

Okabayashi, Satoki, Yokoyama, Tetsuya, Nakanishi, Nao, Iwamori, Hikaru

Geochimica Et Cosmochimica Acta   244   197 - 215   2019.1

Chemically defining the building blocks of the Earth

Tetsuya Yokoyama

ArXiv   2019

Assessment of the secondary instrumental fractionation in TIMS: Implication for high-precision Nd isotope analysis of geological samples

Tetsuya Yokoyama

GEOCHEMICAL JOURNAL   2019

Development of Lead Isotope Analysis for Picogram Size Samples by TE-DS-TIMS using Amplifier equipped with 10^13 Ohm Resistors Reviewed

Fukami Yusuke, Tobita Minato, Yokoyama Tetsuya, Suzuki Katsuhiko

Abstracts of Annual Meeting of the Geochemical Society of Japan   66 ( 0 )   83 - 83   2019

Magma plumbing system at Izu-Oshima Volcano, Japan: Constraints from petrological and geochemical analyses Reviewed

Takeshi Kuritani, Azusa Yamaguchi, Sayuki Fukumitsu, Mitsuhiro Nakagawa, Akiko Matsumoto, Tetsuya Yokoyama

Frontiers in Earth Science   6   178   2018.11

Re-Os isotope systematics and fractionation of siderophile elements in metal phases from CBa chondrites Reviewed

Nakanishi, Nao, Yokoyama, Tetsuya, Okabayashi, Satoki, Usui, Tomohiro, Iwamori, Hikaru

Meteoritics & Planetary Science   53 ( 5 )   1051 - 1065   2018.5

Upper Triassic mafic dykes of Lake Nyos, Cameroon (West Africa) I: K-Ar age evidence within the context of Cameroon Line magmatism, and the tectonic significance Reviewed

Aka Festus Tongwa, Hasegawa Takeshi, Nche Linus Anye, Asaah Asobo Nkengmatia Elvis, Mimba Mumbfu Ernestine, Teitchou Isidore, Ngwa Caroline, Miyabuchi Yasuo, Kobayashi Tetsuo, Kankeu Boniface, Yokoyama Tetsuya, Tanyileke Gregory, Ohba Takeshi, Hell Joseph Victor, Kusakabe Minoru

JOURNAL OF AFRICAN EARTH SCIENCES   141   49 - 59   2018.5

The Origin and Evolution of Nucleosynthetic Sr Isotope Variability in Calcium and Aluminum-rich Refractory Inclusions Reviewed

Kunihiro Myojo, Tetsuya Yokoyama, Satoki Okabayashi, Shigeyuki Wakaki, Naoji Sugiura, Hikaru Iwamori

Astrophysical Journal   853 ( 1 )   2018.1

Coupled Pb isotopic and trace element systematics of the Tissint meteorite: Geochemical signatures of the depleted shergottite source mantle Reviewed

Ryota Moriwaki, Tomohiro Usui, Justin I. Simon, John H. Jones, Tetsuya Yokoyama, Minato Tobita

EARTH AND PLANETARY SCIENCE LETTERS   474   180 - 189   2017.9

Neodymium isotope heterogeneity of ordinary and carbonaceous chondrites and the origin of non-chondritic Nd-142 compositions in the Earth Reviewed

Ryota Fukai, Tetsuya Yokoyama

EARTH AND PLANETARY SCIENCE LETTERS   474   206 - 214   2017.9

Fluid-fluxed melting of mantle versus decompression melting of hydrous mantle plume as the cause of intraplate magmatism over a stagnant slab: Implications from Fukue Volcano Group, SW Japan Reviewed

Takeshi Kuritani, Tetsuya Sakuyama, Natsumi Kamada, Tetsuya Yokoyama, Mitsuhiro Nakagawa

LITHOS   282   98 - 110   2017.6

Investigating the Influence of Non-Spectral Matrix Effects in the Determination of Twenty-Two Trace Elements in Rock Samples by ICP-QMS Reviewed

Tetsuya Yokoyama, Yuichiro Nagai, Yu Hinohara, Tomohiko Mori

GEOSTANDARDS AND GEOANALYTICAL RESEARCH   41 ( 2 )   221 - 242   2017.6

Precise isotope analysis of sub-nanogram lead by total evaporation thermal ionization mass spectrometry (TE-TIMS) coupled with a Pb-204-Pb-207 double spike method Reviewed

Yusuke Fukami, Minato Tobita, Tetsuya Yokoyama, Tomohiro Usui, Ryota Moriwaki

JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY   32 ( 4 )   848 - 857   2017.4

Evaluation of the long-term fluctuation in isotope ratios measured by TIMS with the static, dynamic, and multistatic methods: A case study for Nd isotope measurements Reviewed

Ryota Fukai, Tetsuya Yokoyama, Saya Kagami

INTERNATIONAL JOURNAL OF MASS SPECTROMETRY   414   1 - 7   2017.3

Chemical Evolution of Pu-244 in the Solar Vicinity and Its Implications for the Properties of r-process Production Reviewed

Takuji Tsujimoto, Tetsuya Yokoyama, Kenji Bekki

ASTROPHYSICAL JOURNAL LETTERS   835 ( 1 )   2017.1

Geochemical study of zircons from mesosiderites

Yagi Hikaru, K. Haba Makiko, Okabayashi Satoki, Yamaguchi Akira, Yokoyama Tetsuya

Abstracts of Annual Meeting of the Geochemical Society of Japan   64   260 - 260   2017

Tellurium isotope compositions in acid leach fractions of carbonaceous chondrites Reviewed

Yusuke Fukami, Tetsuya Yokoyama

GEOCHEMICAL JOURNAL   51 ( 1 )   17 - 29   2017

New constraints on shergottite petrogenesis from analysis of Pb isotopic compositional space: Implications for mantle heterogeneity and crustal assimilation on Mars Reviewed

Minato Tobita, Tomohiro Usui, Tetsuya Yokoyama

GEOCHEMICAL JOURNAL   51 ( 1 )   81 - 94   2017

Isotopic dichtomy in the early Solar System inferred from Sr and Nd isotope anomalies of bulk chondrites

Fukai Ryota, Yokoyama Tetsuya, Sugimoto Kei, Okui Wataru, Hasegawa Sho

Abstracts of Annual Meeting of the Geochemical Society of Japan   64   194 - 194   2017

Assessment of secondary mass-dependent isotopic fractionation in ion focusing system of TIMS: Implication for high precision Nd isotope analysis

Fukai Ryota, Yokoyama Tetsuya

Abstracts of Annual Meeting of the Geochemical Society of Japan   64   290 - 290   2017

Lead isotope systematics of the depleted olivine-phyric shergottites: Implications for the heterogeneous depleted source mantle

Moriwaki Ryota, Usui Tomohiro, I. Simon Justin, H. Jones John, Yokoyama Tetsuya

Abstracts of Annual Meeting of the Geochemical Society of Japan   64   189 - 189   2017

Geochemistry and Sm-Nd chronology of a new member of Stannern trend eucrites, Northwest Africa 7188

Kagami Saya, Yokoyama Tetsuya, Usui Tomohiro, K. Haba Makiko, C. Greenwood Richard

Abstracts of Annual Meeting of the Geochemical Society of Japan   64   266 - 266   2017

Nucleosynthetic isotope anomalies in meteorites and the origin of r-process nuclides

Yokoyama Tetsuya, Fukai Ryota, Tsujimoto Takuji

Abstracts of Annual Meeting of the Geochemical Society of Japan   64   201 - 201   2017

Detection of Sulfate from Impact Glasses in Martian Meteorites by X-ray Absorption Near-Edge Structure Analysis

Shidare Masashi, Nakada Ryoichi, Usui Tomohiro, Kenji Shimizu, Yokoyama Tetsuya, Takahashi Yoshio

Abstracts of Annual Meeting of the Geochemical Society of Japan   64   136 - 136   2017

Chemical separation of Nd from geological samples for chronological studies using Sm-146-Nd-142 and Sm-147-Nd-143 systematics Reviewed

Saya Kagami, Tetsuya Yokoyama

ANALYTICA CHIMICA ACTA   937   151 - 159   2016.9

Intensive Hydration of the Wedge Mantle at the Kuril Arc-NE Japan Arc Junction: Implications from Mafic Lavas from Usu Volcano, Northern Japan Reviewed

Takeshi Kuritani, Mayumi Tanaka, Tetsuya Yokoyama, Mitsuhiro Nakagawa, Akiko Matsumoto

JOURNAL OF PETROLOGY   57 ( 6 )   1223 - 1240   2016.6

Two isotopic reservoirs in the early solar system: clues from Mo isotope anomalies for bulk meteorites

Nagai Yuichiro, Yokoyama Tetsuya, Hirata Takafumi

Abstracts of Annual Meeting of the Geochemical Society of Japan   63   85 - 85   2016

Nucleosynthetic Isotope Variations of Siderophile and Chalcophile Elements in the Solar System Reviewed

Tetsuya Yokoyama, Richard J. Walker

HIGHLY SIDEROPHILE AND STRONGLY CHALCOPHILE ELEMENTS IN HIGH-TEMPERATURE GEOCHEMISTRY AND COSMOCHEMISTRY   81   107 - 160   2016

Molybdenum isotopic analysis by negative thermal ionization mass spectrometry (N-TIMS): effects on oxygen isotopic composition Reviewed

Yuichiro Nagai, Tetsuya Yokoyama

JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY   31 ( 4 )   948 - 960   2016

In-situ trace element analysis of Fe-Ni metal in ordinary chondrite

Okabayashi Satoki, Yokoyama Tetsuya, Iwamori Hikaru

Abstracts of Annual Meeting of the Geochemical Society of Japan   63   84 - 84   2016

A comparative review of petrogenetic processes beneath the Cameroon Volcanic Line: Geochemical constraints Reviewed

Asobo N. E. Asaah, Tetsuya Yokoyama, Festus T. Aka, Tomohiro Usui, Mengnjo J. Wirmvem, Boris Chako Tchamabe, Takeshi Ohba, Gregory Tanyileke, J. V. Hell

GEOSCIENCE FRONTIERS   6 ( 4 )   557 - 570   2015.7

Geochemistry of lavas from maar-bearing volcanoes in the Oku Volcanic Group of the Cameroon Volcanic Line Reviewed

Asobo N. E. Asaah, Tetsuya Yokoyama, Festus T. Aka, Tomohiro Usui, Takeshi Kuritani, Mengnjo J. Wirmvem, Hikaru Iwamori, Eric M. Fozing, Jules Tamen, Gilbert Z. Mofor, Takeshi Ohba, Gregory Tanyileke, J. V. Hell

CHEMICAL GEOLOGY   406   55 - 69   2015.6

Constraints for the Causes of Mass Extinction at the Triassic-Jurassic Boundary Based on High Precision Platinum Group Element Analyses Reviewed

Fujisaki Wataru, Sawaki Yusuke, Yokoyama Tetsuya, Yamamoto Shinji, Maruyama Shigenori

BUNSEKI KAGAKU   64 ( 5 )   341 - 348   2015.5

Nucleosynthetic strontium isotope anomalies in carbonaceous chondrites Reviewed

Tetsuya Yokoyama, Yusuke Fukami, Wataru Okui, Nobuaki Ito, Hiroshi Yamazaki

EARTH AND PLANETARY SCIENCE LETTERS   416   46 - 55   2015.4

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

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

CHEMICAL GEOLOGY   396   255 - 264   2015.3

P55 Magmatic processes for An-ei eruption from Izu-Oshima volcano

Fukumitsu Sayuki, Kuritani Takeshi, Yokoyama Tetsuya

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2015   153 - 153   2015

Feasibility studies of Sn isotope composition for provenancing ancient bronzes Reviewed

E. Yamazaki, S. Nakai, Y. Sahoo, T. Yokoyama, H. Mifune, T. Saito, J. Chen, N. Takagi, N. Hokanishi, A. Yasuda

JOURNAL OF ARCHAEOLOGICAL SCIENCE   52   458 - 467   2014.12

Chemical Separation of Mo and W from Terrestrial and Extraterrestrial Samples via Anion Exchange Chromatography Reviewed

Yuichiro Nagai, Tetsuya Yokoyama

ANALYTICAL CHEMISTRY   86 ( 10 )   4856 - 4863   2014.5

Precise tellurium isotope analysis by negative thermal ionization mass spectrometry (N-TIMS) Reviewed

Yusuke Fukami, Tetsuya Yokoyama

JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY   29 ( 3 )   520 - 528   2014.3

Elemental transport upon hydration of basic schists during regional metamorphism: Geochemical evidence from the Sanbagawa metamorphic belt, Japan Reviewed

Masaoki Uno, Hikaru Iwamori, Hitomi Nakamura, Tetsuya Yokoyama, Tsuyoshi Ishikawa, Masaharu Tanimizu

GEOCHEMICAL JOURNAL   48 ( 1 )   29 - 49   2014

Rare earth elements and Sr–Nd–Pb isotopic analyses of the Arima hot spring waters, Southwest Japan: implications for origin of the Arima-type brine Reviewed

Nakamura, H., Fujita, Y., Nakai, S., Yokoyama, T., Iwamori, H.

J Geol Geosci   3 ( 161 )   2 - 2   2014

Tellurium Isotope Anomaly in Acid Resistant Fraction of Allende Meteorite Reviewed

Fukami Yusuke, Yokoyama Tetsuya, Okui Wataru

Abstracts of Annual Meeting of the Geochemical Society of Japan   61 ( 0 )   175 - 175   2014

Rare earth elements and Sr–Nd–Pb isotopic analyses of the Arima hot spring waters, Southwest Japan: implications for origin of the Arima-type brine Reviewed

Nakamura, H., Fujita, Y., Nakai, S., Yokoyama, T., Iwamori, H.

J Geol Geosci   3 ( 161 )   2 - 2   2014

Preliminary report on U-Th-Pb isotope systematics of the olivine-phyric shergottite Tissint

Moriwaki Ryota, Usui Tomohiro, Yokoyama Tetsuya, I. Simon J., H. Jones J.

Abstracts of Annual Meeting of the Geochemical Society of Japan   61   182 - 182   2014

Thermal processing in the early solar system and isotope anomalies in meteorites Reviewed

Yokoyama Tetsuya, Fukami Yusuke, Nagai Yuichiro, Nakamoto Taishi

Abstracts of Annual Meeting of the Geochemical Society of Japan   61 ( 0 )   174 - 174   2014

THREE-DIMENSIONAL EXTERNAL SHAPE AND INTERNAL STRUCTURE OF CHONDRULES IN ALLENDE CV3 CHONDRITE

Tetsuya Yokoyama

Meteoritics & Planetary Science   2014

Development of highly precise Nd isotope analysis for 146Sm-142Nd chronology of basaltic eucrites

Kagami Saya, Yokoyama Tetsuya

Abstracts of Annual Meeting of the Geochemical Society of Japan   61   180 - 180   2014

Sediment-enriched adakitic magmas from the Daisen volcanic field, Southwest Japan Reviewed

Maureen Feineman, Takuya Moriguti, Tetsuya Yokoyama, Sakiko Terui, Eizo Nakamura

GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS   14 ( 8 )   3009 - 3031   2013.8

The naked planet Earth: Most essential pre-requisite for the origin and evolution of life Reviewed

S. Maruyama, M. Ikoma, H. Genda, K. Hirose, T. Yokoyama, M. Santosh

Geoscience Frontiers   4 ( 2 )   141 - 165   2013.3

Tin isotope analysis of cassiterites from Southeastern and Eastern Asia Reviewed

Erika Yamazaki, Shun'ich Nakai, Tetsuya Yokoyama, Shunso Ishihara, Hongfeng Tang

GEOCHEMICAL JOURNAL   47 ( 1 )   21 - 35   2013

Current status of the debate about the age of Lake Nyos dam (Cameroon) and its bearing on potential flood hazards Reviewed

Festus Tongwa Aka, Tetsuya Yokoyama

Natural Hazards   65 ( 1 )   875 - 885   2013

PLANETARY-SCALE STRONTIUM ISOTOPIC HETEROGENEITY AND THE AGE OF VOLATILE DEPLETION OF EARLY SOLAR SYSTEM MATERIALS Reviewed

Frederic Moynier, James M. D. Day, Wataru Okui, Tetsuya Yokoyama, Audrey Bouvier, Richard J. Walker, Frank A. Podosek

ASTROPHYSICAL JOURNAL   758 ( 1 )   2012.10

Preface to &ldquo;Geofluids&rdquo;

KOGISO Tetsu, IWAMORI Hikaru, YOKOYAMA Tetsuya

Chikyukagaku   46 ( 4 )   189 - 190   2012

238U-230Th disequilibrium in volcanic rocks from the NE Japan arc

Yokoyama Tetsuya, Iwamori Hikaru, Ueki Kenta

Abstracts of Annual Meeting of the Geochemical Society of Japan   59 ( 0 )   175 - 175   2012

PLANETARY SCALE Sr ISOTOPIC HETEROGENEITY

Tetsuya Yokoyama

Meteoritics & Planetary Science   2012

Assessment of nebular versus parent body processes on presolar components present in chondrites: Evidence from osmium isotopes Reviewed

Tetsuya Yokoyama, Conel M. O&apos;D. Alexander, Richard J. Walker

EARTH AND PLANETARY SCIENCE LETTERS   305 ( 1-2 )   115 - 123   2011.5

Timescales of magma differentiation from basalt to andesite beneath Hekla Volcano, Iceland: Constraints from U-series disequilibria in lavas from the last quarter-millennium flows Reviewed

Takele A. Chekol, Katsura Kobayashi, Tetsuya Yokoyama, Chie Sakaguchi, Eizo Nakamura

GEOCHIMICA ET COSMOCHIMICA ACTA   75 ( 1 )   256 - 283   2011.1

Geochemical evolution of historical lavas from Askja Volcano, Iceland: Implications for mechanisms and timescales of magmatic differentiation Reviewed

Takeshi Kuritani, Tetsuya Yokoyama, Hiroshi Kitagawa, Katsura Kobayashi, Eizo Nakamura

GEOCHIMICA ET COSMOCHIMICA ACTA   75 ( 2 )   570 - 587   2011.1

Determinations of trace-siderophile elements by fs-LA-ICPMS using synthesized metallic standard material

Yokoyama D. Takaomi, Imai Takamasa, Suzuki Toshihiro, Yokoyama Tetsuya, Takahashi Eiichi, Takeyama Masao, Hirata Takafumi

Abstracts of Annual Meeting of the Geochemical Society of Japan   58   315 - 315   2011

Evaluation of Laser Ablation in Liquid (LAL) technique as a new sampling technique for elemental and isotopic analysis using ICP-mass spectrometry Reviewed

Satoki Okabayashi, Takaomi D. Yokoyama, Yoshiaki Kon, Shinji Yamamoto, Tetsuya Yokoyama, Takafumi Hirata

JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY   26 ( 7 )   1393 - 1400   2011

Iron isotopic signature for weathered Fe-Ni phases in the ordinary chondrites obtained with the LAL sampling technique

Okabayashi Satoki, Yokoyama Takaomi, Yokoyama Tetsuya, Hirata Takafumi

Abstracts of Annual Meeting of the Geochemical Society of Japan   58   296 - 296   2011

Osmium isotope anomalies in chondrites: Results for acid residues and related leachates Reviewed

Tetsuya Yokoyama, Conel M. O&apos;D. Alexander, Richard J. Walker

EARTH AND PLANETARY SCIENCE LETTERS   291 ( 1-4 )   48 - 59   2010.3

Contributors to chromium isotope variation of meteorites Reviewed

Liping Qin, Conel M. O&apos;D Alexander, Richard W. Carlson, Mary F. Horan, Tetsuya Yokoyama

GEOCHIMICA ET COSMOCHIMICA ACTA   74 ( 3 )   1122 - 1145   2010.2

Low osmium solubility in silicate at high pressures and temperatures

Tetsuya Yokoyama, David Walker, Richard J. Walker

EARTH AND PLANETARY SCIENCE LETTERS   279 ( 3-4 )   165 - 173   2009.3

Evaluation of chemical heterogeneity for the synthetic metal standard

Imai Takamasa, Yokoyama Takaomi, Yokoyama Tetsuya, Takeyama Masao, Takahashi Eiichi, Hirata Takafumi

Abstracts of Annual Meeting of the Geochemical Society of Japan   56   110 - 110   2009

U-series dating of Lake Nyos maar basalts, Cameroon (West Africa): Implications for potential hazards on the Lake Nyos dam

Festus T. Aka, Tetsuya Yokoyama, Minoru Kusakabe, Eizo Nakamura, Gregory Tanyileke, Bekoa Ateba, Vincent Ngako, Joseph Nnange, Joseph Hell

JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH   176 ( 2 )   212 - 224   2008.9

Generation of rear-arc magmas induced by influx of slab-derived supercritical liquids: Implications from alkali basalt lavas from Rishiri Volcano, Kurile arc

Takeshi Kuritani, Tetsuya Yokoyama, Eizo Nakamura

JOURNAL OF PETROLOGY   49 ( 7 )   1319 - 1342   2008.7

Osmium partitioning behavior between metal and silicate melt at high pressure and temperature: A new experimental approach

Tetsuya Yokoyama

Geochimica et Cosmochimica Acta   2008

Elemental analyses using newly developed femtosecond laser ablation-ICP-mass spectrometry

Hirata Takafumi, Kon Yoshiaki, Yokoyama Takaomi, Yokoyama Tetsuya

Abstracts of Annual Meeting of the Geochemical Society of Japan   55   111 - 111   2008

Osmium isotope evidence for uniform distribution of s- and r-process components in the early solar system

Tetsuya Yokoyama, Vinai K. Rai, M. O'D. Alexander, Roy S. Lewis, Richard W. Carlson, Steven B. Shirey, Mark H. Thiemens, Richard J. Walker

EARTH AND PLANETARY SCIENCE LETTERS   259 ( 3-4 )   567 - 580   2007.7

Rates of thermal and chemical evolution of magmas in a cooling magma chamber: a chronological and theoretical study on basaltic and andesitic lavas from Rishiri Volcano, Japan

Takeshi Kuritani, Tetsuya Yokoyama, Eizo Nakamura

JOURNAL OF PETROLOGY   48 ( 7 )   1295 - 1319   2007.7

Plume-litho sphere interaction beneath Mt. Cameroon volcano, West Africa: Constraints from U-238-Th-230-Ra-226 and Sr-Nd-Pb isotope systematics

Tetsuya Yokoyama, Festus T. Aka, Minoru Kusakabe, Eizo Nakamura

GEOCHIMICA ET COSMOCHIMICA ACTA   71 ( 7 )   1835 - 1854   2007.4

Geochemical evolution of a shallow magma plumbing system during the last 500 years, Miyakejima volcano, Japan: Constraints from U-238-Th-230-Ra-226 systematics

T Yokoyama, T Kuritani, K Kobayashi, E Nakamura

GEOCHIMICA ET COSMOCHIMICA ACTA   70 ( 11 )   2885 - 2901   2006.6

Accurate isotopic and concentration analyses of small amounts of Pb using isotope dilution coupled with the double spike technique Reviewed

Takeshi Kuritani, Tomohiro Usui, Tetsuya Yokoyama, Eizo Nakamura

GEOSTANDARDS AND GEOANALYTICAL RESEARCH   30 ( 3 )   209 - 220   2006

Development of precise isotope analyses of U-series nuclides for the study of U-series disequilibria in magma processes

YOKOYAMA Tetsuya

Chikyukagaku   39 ( 1 )   27 - 46   2005

Precise analysis of the Ra-228/Ra-226 isotope ratio for short-lived U-series disequilibria in natural samples by total evaporation thermal ionization mass spectrometry (TE-TIMS)

T Yokoyama, E Nakamura

JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY   19 ( 6 )   717 - 727   2004

Shift and rotation of composition trends by magma mixing: 1983 eruption at Miyake-jima volcano, Japan Reviewed

T Kuritani, T Yokoyama, K Kobayashi, E Nakamura

JOURNAL OF PETROLOGY   44 ( 10 )   1895 - 1916   2003.10

Mantle metasomatism and rapid ascent of slab components beneath island arcs: Evidence from U-238-Th-230-Ra-226 disequilibria of Miyakejima volcano, Izu arc, Japan Reviewed

T Yokoyama, K Kobayashi, T Kuritani, E Nakamura

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH   108 ( B7 )   2003.7

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

Eizo Nakamura, Akio Makishima, Takuya Moriguti, Katsura Kobayashi, Chie Sakaguchi, Tetsuya Yokoyama, Ryoji Tanaka, Takeshi Kuritani, Hiroyuki Takei

The Institute of Space and Astronautical Science Report   Sp. No 16   49 - 101   2003

Timing and trigger of arc volcanism controlled by fluid flushing from subducting slab

T Yokoyama, E Nakamura, K Kobayashi, T Kuritani

PROCEEDINGS OF THE JAPAN ACADEMY SERIES B-PHYSICAL AND BIOLOGICAL SCIENCES   78 ( 7 )   190 - 195   2002.9

Precise determination of ferrous iron in silicate rocks

T Yokoyama, E Nakamura

GEOCHIMICA ET COSMOCHIMICA ACTA   66 ( 6 )   1085 - 1093   2002.3

Precise analysis of U-234/U-238 ratio using UO2+ ion with thermal ionization mass spectrometry for natural samples

T Yokoyama, A Makishima, E Nakamura

CHEMICAL GEOLOGY   181 ( 1-4 )   1 - 12   2001.10

Formation and suppression of AIF(3) during HF digestion of rock samples in Teflon bomb for precise trace element analyses by ICP-MS and ID-TIMS Reviewed

H Takei, T Yokoyama, A Makishima, E Nakamura

PROCEEDINGS OF THE JAPAN ACADEMY SERIES B-PHYSICAL AND BIOLOGICAL SCIENCES   77 ( 1 )   13 - 17   2001.1

Evaluation of the coprecipitation of incompatible trace elements with fluoride during silicate rock dissolution by acid digestion

T Yokoyama, A Makishima, E Nakamura

CHEMICAL GEOLOGY   157 ( 3-4 )   175 - 187   1999.5

Helium and carbon isotopic compositions of hot spring gases in the Tibetan Plateau

T Yokoyama, S Nakai, H Wakita

JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH   88 ( 1-2 )   99 - 107   1999.1

Separation of thorium and uranium from silicate rock samples using two commercial extraction chromatographic resins

T Yokoyama, A Makishima, E Nakamura

ANALYTICAL CHEMISTRY   71 ( 1 )   135 - 141   1999.1

Development of Precise Pb Isotope Analysis for Zircon Using Total Evaporation TIMS (TE-TIMS)

Tobita Minato, Asanuma Hisashi, Fukami Yusuke, Moriwaki Ryota, Yokoyama Tetsuya, Usui Tomohiro

Abstracts of Annual Meeting of the Geochemical Society of Japan   64 ( 0 )   ROMBUNNO.3P41(J‐STAGE) - 295   2017

非炭素質コンドライト隕石の高精度Sr同位体測定

杉本圭, 深井稜汰, 横山哲也, 鏡味沙耶, 羽場麻希子

日本地球化学会年会要旨集(Web)   64th   ROMBUNNO.3A11(J‐STAGE) - 195   2017

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

深海雄介, 飛田南斗, 横山哲也, 森脇涼太, 臼井寛裕

日本地球化学会年会講演要旨集   63rd   197   2016

アカスタ片麻岩体苦鉄質岩の¹⁴²Nd同位体から制約する冥王代マントル進化

越田渓子, 石川晃, 横山哲也, 鏡味沙耶, 深井稜汰, 小宮剛

日本地球化学会年会講演要旨集   63rd   2016

P58 Generation condition of basaltic magma from Usu Volcano

Kuritani Takeshi, Tanaka Mayumi, Yokoyama Tetsuya, Nakagawa Mitsuhiro, Matsumoto Akiko

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2015 ( 0 )   156 - 156   2015

Mantle heterogeneity and material recycling estimated from 3.5-3.8 Ga basalts

Sano Ayane, Nakamura Hitomi, Komiya Tsuyoshi, Yokoyama Tetsuya, Uno Masaoki, Kimura Junichi, Chang Qing, Iwamori Hikaru

Abstracts of Annual Meeting of the Geochemical Society of Japan   61   156 - 156   2014

Search for Tellurium Isotopic Anomalies in Primitive Meteorites by N-TIMS

Fukami Yusuke, Yokoyama Tetsuya

Abstracts of Annual Meeting of the Geochemical Society of Japan   58 ( 0 )   227 - 227   2011

Relationship between IIIAB iron meteorites and pallasites main group explored by tungsten stable isotope compositions

Fukami Yusuke, Kimura Jun-ichi, Irisawa Keita, Yokoyama Tetsuya, Hirata Takafumi

Abstracts of Annual Meeting of the Geochemical Society of Japan   57 ( 0 )   272 - 272   2010

Analytical protocol for the U-Pb age determination on young zircons

Hirata Takafumi, Orihashi Yuji, Okabayashi Satoki, Yokoyama Takaomi, Yokoyama Tetsuya

Abstracts of Annual Meeting of the Geochemical Society of Japan   56th   254 - 254   2009

More on Os isotope anomalies in chondrites: Possible carriers

Tetsuya Yokoyama, Vinai K. Rai, Conel M. O'D. Alexander, Richard J. Walker

GEOCHIMICA ET COSMOCHIMICA ACTA   71 ( 15 )   A1147 - A1147   2007.8

B33 Rates of the thermal and chemical evolution of a cooling magma body : constraints from Kutsugata and Tanetomi lavas, Rishiri Volcano(THE VOLCANOLOGICAL SOCIETY OF JAPAN 2006 FALL MEETING)

Kuritani Takeshi, Yokoyama Tetsuya, Nakamura Eizo

Programme and abstracts the Volcanological Society of Japan   2006   89 - 89   2006.10

Geochemical evolution of shallow magma plumbing system during the last 500 years, Miyakejima volcano, Japan: Constraints from U-Th-Ra systematics

Yokoyama T, Kuritani T, Kobayashi K, Nakamura E

GEOCHIMICA ET COSMOCHIMICA ACTA   2004

Precise determination of U-Th-Ra disequilibria in natural samples using TIMS with sequential chromatographic separation of U, Th and Ra

T Yokoyama, E Nakamura

GEOCHIMICA ET COSMOCHIMICA ACTA   67 ( 18 )   A568 - A568   2003.9

Mantle metasomatism and rapid ascent of slab components beneath Miyakejima volcano, Izu arc, Japan

T Yokoyama, K Kobayashi, T Kuritani, E Nakamura

GEOCHIMICA ET COSMOCHIMICA ACTA   66 ( 15A )   A864 - A864   2002.8

Mantle metasomatism and rapid ascent of slab components beneath Miyakejima volcano, Izu arc, Japan

Yokoyama T, Kobayashi K, Kuritani T, Nakamura E

GEOCHIMICA ET COSMOCHIMICA ACTA   2002

Investigation of the plume source regions using mantle xenoliths

Grant number：19H01998  2019.4 - 2022.3

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

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

Grant number：18H01258  2018.4 - 2023.3

日本学術振興会  科学研究費助成事業  基盤研究(B)

辻本 拓司, 横山 哲也

沈み込む海山が島弧火山活動に及ぼす影響

Grant number：18H03747  2018.4 - 2022.3

日本学術振興会  科学研究費助成事業  基盤研究(A)

岩森 光, 横山 哲也, 石川 晃, 中村 仁美, 西澤 達治, 石塚 治

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

Grant number：18H04457  2018.4 - 2020.3

日本学術振興会  科学研究費助成事業  新学術領域研究(研究領域提案型)

横山 哲也

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

Grant number：16H04081  2016.4 - 2019.3

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

Yokoyama Tetsuya

Dating of presolar grains by nuclear cosmochronology

Grant number：15K13602  2015.4 - 2017.3

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

Yokoyama Tetsuya

冥王代地球

Grant number：26106002  2014.7 - 2019.3

日本学術振興会  科学研究費助成事業  新学術領域研究(研究領域提案型)

丸山 茂徳, 横山 哲也, 澤木 佑介, 大森 聡一, 鳴海 一成, ドーム ジェームズ, 丹下 慶範

Decoding of the early earth's evolution

Grant number：26220713  2014.5 - 2019.3

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

KOMIYA Tsuyoshi

Characterization and genesis of mantle compositional hemispheres

Grant number：26247091  2014.4 - 2017.3

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

Iwamori Hikaru, Hanyu Takeshi, Tatiana Churikova, Boris Gordeychik, Asobo Asaah, Festus T. Aka, Shimizu Kenji, Nishizawa Tatsuji, Ozawa Takahiro

冥王代の固体地球進化解読

Grant number：26247083  2014.4 - 2015.3

日本学術振興会  科学研究費助成事業  基盤研究(A)

小宮 剛, 片山 郁夫, 横山 哲也, 石川 晃

Water content of the mantle transition zone constrained by volcanic rocks

Grant number：25287144  2013.4 - 2016.3

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

Kuritani Takeshi, YOKOYAMA TETSUYA, NAKAMURA MICHIHIKO

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

Grant number：24340102  2012.4 - 2015.3

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

NAKAMOTO Taishi, YOKOYAMA Tetsuya

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

Grant number：23224012  2011.4 - 2016.3

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

Maruyama Shigenori, YOKOYAMA Tetsuya, KAWAI Kenji, SENSHU Hiroki, ZHAO Dapeng, OMORI Soichi, KOMABAYASHI Tetsuya

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

Grant number：23340171  2011.4 - 2014.3

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

YOKOYAMA Tetsuya, HIRATA Takahumi, NAKAMOTO Taishi

Heterogeneity of subduction zone mantle: Towards geochemical tomography

Grant number：22244069  2010 - 2012

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

IWAMORI Hikaru, YOKOYAMA Tetsuya, HIRATA Takafumi, NAKAMURA Hitomi

Generation and migration dynamics of geofluids

Grant number：21109006  2009.7 - 2014.3

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

IWAMORI Hikaru, KAZAHAYA Kohei, TANIMIZU Masaharu, KATO Yasuhiro, YOKOYAMA Tetsuya, TOKUNAGA Tomochika, KURITA Kei, KIMURA Jun-ichi, NAKAMURA Hitomi, FUJINAGA Koichiro

Geofluid: Nature and dynamics of fluids in subduction zones

Grant number：21109001  2009.7 - 2014.3

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

TAKAHASHI Eiichi, KURITA Kei, KAWAMURA Katsuyuki, YOKOYAMA Tetsuya, MATSUZAWA Tooru, OGAWA Yasuo, KOGISO Tetsu, NAKAMURA Michihiko, IWAMORI Hikaru, HAMADA Morihisa, SAKUMA Hiroshi

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

Grant number：21740388  2009 - 2010

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

YOKOYAMA Tetsuya

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

Grant number：17253002  2005 - 2008

Ministry of Education, Culture, Sports, Science and Technology  Grants-in-Aid for Scientific Research(基盤研究(A))  基盤研究(A)

Mitsuhiro NAKAGAWA, 高橋 浩晃, 大場 武, 石川 剛志, 金子 隆之, Takeshi HASGIMOTO, 西村 裕一, 風早 康平, 石塚 吉浩, Hiroaki TAKAHASHI, Minoru KASAHARA, Yuichi NISHIMURA, Mitsuhiro YOSHIMOTO, Kohei KAZAHAYA, Yoshihiro ISHIZUKA, Takayuki KANEKO

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

Grant number：01J04299  2001 - 2003

日本学術振興会  科学研究費助成事業  特別研究員奨励費

横山 哲也