Publication

​論文

2025​

• Accurate determination of whole-rock major element composition of ultramafic rocks through X-ray fluorescence spectrometry. Mikuni, Kazuto & Ishikawa, Akira & Sato, Ryu. GEOCHEMICAL JOURNAL. 59. 10.2343/geochemj.GJ25017. 2025年11月

• “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年5月10日  

• Prolonged 187Os/188Os excursion implies hydrothermal influence after the Chicxulub impact in the Gulf of Mexico 

  Honami Sato, Akira Ishikawa, Ignacio Arenillas, José A. Arz, Vicente Gilabert, Philippe Claeys, Steven Goderis, Christopher M. Lowery, Sean P. S. Gulick, Joanna V. Morgan

  Nature Communications 2025年4月8日  

• Multidisciplinary evidence for synchroneity between Ontong Java Nui volcanism and early Aptian oceanic anoxic event 1a 

  Hironao Matsumoto, Kotaro Shirai, Akira Ishikawa, Naohiko Ohkouchi, Nanako O. Ogawa, Maria Luisa G. Tejada, Atsushi Ando, Junichiro Kuroda, Katsuhiko Suzuki

  Science Advances 11(9) 2025年2月28日  

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

  Sch{\"o}nb, a}chler, M., Fehr, M.A., Yokoyama, T., Gautam, I., Nakanishi, N., Abe, Y., Al{\'e}on, J., Alexander, C., Amari, S. …

  Meteoritics and Planetary Science 60(1) 2025年

2024

• 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 …

  Science Advances 10(39) 2024年9月27日  査読有り

• Microstructures, hydrogen concentrations, and seismic properties of a tectonically exhumed sliver of oceanic mantle lithosphere, Moa Island, Timor-Tanimbar outer-arc, eastern Indonesia 

  Demouchy, S., Barou, F., Ishikawa, A., Gard{\'e}s, E., Tommasi, A.

  Tectonophysics 887 2024年9月  

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

  Hiroharu Yui, Shu-hei Urashima, Morihiko Onose, Mayu Morita, Shintaro Komatani, Izumi Nakai, Yoshinari Abe, Yasuko Terada, Hisashi Homma, Kazuko Motomura …

  Geochimica et Cosmochimica Acta 379 172-183 2024年8月  

• Evidence for suboceanic small-scale convection from a “garnet”-bearing lherzolite xenolith from Aitutaki Island, Cook Islands 

  Norikatsu Akizawa, Kazuhito Ozawa, Tetsu Kogiso, Akira Ishikawa, Akira Miyake, Yohei Igami, Simon R. Wallis, Takayoshi Nagaya, Chihiro Ohshima, Ryo Fujita …

  Progress in Earth and Planetary Science 11(1) 2024年7月5日  

• Stable carbon and oxygen isotope signatures of mantle-derived calcite in Aitutaki lherzolite xenolith: Implications for organic carbon cycle in the oceanic mantle 

  Norikatsu Akizawa, Toyoho Ishimura, Masako Yoshikawa, Tetsu Kogiso, Akira Ishikawa, Kazuhide Mimura

  Marine Geology 107363-107363 2024年7月  

• 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 …

  Meteoritics & Planetary Science 2024年4月  

• Brief and intensive volcanic emissions from Ontong Java Nui heralded Oceanic Anoxic Event 1a 

  Matsumoto, H., Goto, K.T., Shimoda, G., Watanabe, Y., Shirai, K., Tejada, M.L.G., Ishikawa, A., Ando, A., Sano, T., Kuroda, J. …

  Communications Earth and Environment 5(1) 155 2024年3月  査読有り

• 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 …

  Icarus 409 115884-115884 2024年2月  

• Hydrogen in magnetite from asteroid Ryugu 

  Al{\'e}on, J., Mostefaoui, S., Bureau, H., Vangu, D., Khodja, H., Nagashima, K., Kawasaki, N., Abe, Y., Alexander, C.M.O.D. …

  Meteoritics and Planetary Science 59(8) 2024年  

• 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 

  Fujita, R., Nakano, S., Yokoyama, T., Ishikawa, A.

  Geochemical Journal 58(1) 2024年  

• 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 58(2) 51-70 2024年

2023年

• 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 …

• Analytical Chemistry 2023年12月28日  査読有り

• Fine-grained interplanetary dust input during the Turonian (Late Cretaceous): evidence from osmium isotope and platinum group elements 

• Hironao Matsumoto, Akira Ishikawa, Rodolfo Coccioni, Fabrizio Frontalini, Katsuhiko Suzuki

• SCIENTIFIC REPORTS 13(1) 2023年12月12日  

• 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 …

• Meteoritics & Planetary Science 2023年12月7日  

• The Magnesium Isotope Composition of Samples Returned from Asteroid Ryugu 

• Martin Bizzarro, Martin Schiller, Tetsuya Yokoyama, Yoshinari Abe, Jérôme Aléon, Conel M. O’D. Alexander, Sachiko Amari, Yuri Amelin, Ken-ichi Bajo, Audrey Bouvier …

• The Astrophysical Journal Letters 958(2) L25-L25 2023年11月24日  

• 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 …

• Science Advances 9(45) 2023年11月10日