A
Akira Yamaguchi
Researcher at National Institute of Polar Research
Publications - 187
Citations - 3643
Akira Yamaguchi is an academic researcher from National Institute of Polar Research. The author has contributed to research in topics: Meteorite & Chondrite. The author has an hindex of 33, co-authored 187 publications receiving 3032 citations. Previous affiliations of Akira Yamaguchi include European University of Brittany & Graduate University for Advanced Studies.
Papers
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Journal ArticleDOI
The surface composition of asteroid 162173 Ryugu from Hayabusa2 near-infrared spectroscopy
Kohei Kitazato,Ralph E. Milliken,Takahiro Iwata,Takahiro Iwata,Masanao Abe,Masanao Abe,Makiko Ohtake,Makiko Ohtake,Shuji Matsuura,Takehiko Arai,Yusuke Nakauchi,Tomoki Nakamura,Moe Matsuoka,Hiroki Senshu,Naru Hirata,Takahiro Hiroi,C. Pilorget,Rosario Brunetto,François Poulet,Lucie Riu,J. P. Bibring,Driss Takir,Deborah L. Domingue,Faith Vilas,M. A. Barucci,Davide Perna,Ernesto Palomba,A. Galiano,Kohji Tsumura,Kohji Tsumura,Takahito Osawa,Mutsumi Komatsu,Aiko Nakato,N. Takato,Tsuneo Matsunaga,Y. Takagi,Koji Matsumoto,Toru Kouyama,Y. Yokota,Y. Yokota,Eri Tatsumi,Naoya Sakatani,Yukio Yamamoto,Yukio Yamamoto,Tatsuaki Okada,Tatsuaki Okada,S. Sugita,R. Honda,Tomokatsu Morota,Shingo Kameda,Hirotaka Sawada,C. Honda,Manabu Yamada,H. Suzuki,Kosuke Yoshioka,Masahiro Hayakawa,K. Ogawa,Yuichiro Cho,Kei Shirai,Yuri Shimaki,Akira Yamaguchi,Akira Yamaguchi,Naoko Ogawa,Fuyuto Terui,Tomohiro Yamaguchi,Yuto Takei,Takanao Saiki,Satoru Nakazawa,Satoshi Tanaka,Satoshi Tanaka,Makoto Yoshikawa,Makoto Yoshikawa,Sei-ichiro Watanabe,Sei-ichiro Watanabe,Yoshiyuki Tsuda,Yoshiyuki Tsuda +75 more
TL;DR: The Hayabusa2 team's study of the near-Earth carbonaceous asteroid 162173 Ryugu, at which the spacecraft arrived in June 2018, describes Ryugu's geological features and surface colors and combined results from all three papers to constrain the asteroid's formation process.
Journal ArticleDOI
The Stannern trend eucrites: Contamination of main group eucritic magmas by crustal partial melts
Jean-Alix Barrat,Akira Yamaguchi,Richard C. Greenwood,Marcel Bohn,J. Cotten,Mathieu Benoit,Ian A. Franchi +6 more
TL;DR: The petrology of a new eucrite belonging to the Stannern trend and discuss the origin of this trend was reported in this paper, where contamination of Main Group eucritic magmas by melts derived by partial melting of the asteroid 4-Vesta's crust can successfully explain both the high incompatible trace elements concentrations and the distinctive Eu, Sr, Be anomalies.
Journal ArticleDOI
Relative chronology of crust formation on asteroid Vesta: Insights from the geochemistry of diogenites
TL;DR: In this paper, it was shown that the orthopyroxenes of some diogenites display very deep negative Eu anomalies (Eu/Eu* close to 0.1 or lower).
Journal ArticleDOI
Crustal partial melting on Vesta: Evidence from highly metamorphosed eucrites
Akira Yamaguchi,Akira Yamaguchi,Jean-Alix Barrat,Richard C. Greenwood,N. Shirai,N. Shirai,C. Okamoto,T. Setoyanagi,Mitsuru Ebihara,Ian A. Franchi,Marcel Bohn +10 more
TL;DR: This paper performed a mineralogical and geochemical study of eight metamorphosed basaltic eucrites and classified them into granulitic and type 4-7 eucrite.
Journal ArticleDOI
Geochemistry of diogenites: Still more diversity in their parental melts
Jean-Alix Barrat,Jean-Alix Barrat,Akira Yamaguchi,Richard C. Greenwood,Mathieu Benoit,Mathieu Benoit,Joseph Cotten,Joseph Cotten,Marcel Bohn,Marcel Bohn,Ian A. Franchi +10 more
TL;DR: In this paper, the major and trace element abundances of 18 diogenites, and O-isotopes for 3 of them, were reported, and it was shown that the FeO/MgO ratios of diogenite parental melts range from about 1.4 to 3.5 and therefore largely overlap the values obtained for non-cumulate eucrites.