| Title: | Carbonate record of temporal change in oxygen fugacity and gaseous species in asteroid Ryugu |
| Authors: | Fujiya, Wataru Browse this author →KAKEN DB |
| Kawasaki, Noriyuki Browse this author →KAKEN DB |
| Nagashima, Kazuhide Browse this author |
| Sakamoto, Naoya Browse this author →KAKEN DB |
| O'D. Alexander, Conel M. Browse this author |
| Kita, Noriko T. Browse this author |
| Kitajima, Kouki Browse this author |
| Abe, Yoshinari Browse this author →KAKEN DB |
| Aleon, Jerome Browse this author |
| Amari, Sachiko Browse this author |
| Amelin, Yuri Browse this author |
| Bajo, Ken-ichi Browse this author →KAKEN DB |
| Bizzarro, Martin Browse this author |
| Bouvier, Audrey Browse this author |
| Carlson, Richard W. Browse this author |
| Chaussidon, Marc Browse this author |
| Choi, Byeon-Gak Browse this author |
| Dauphas, Nicolas Browse this author |
| Davis, Andrew M. Browse this author |
| Di Rocco, Tommaso Browse this author |
| Fukai, Ryota Browse this author →KAKEN DB |
| Gautam, Ikshu Browse this author |
| Haba, Makiko K. Browse this author |
| Hibiya, Yuki Browse this author |
| Hidaka, Hiroshi Browse this author |
| Homma, Hisashi Browse this author |
| Hoppe, Peter Browse this author |
| Huss, Gary R. Browse this author |
| Ichida, Kiyohiro Browse this author |
| Iizuka, Tsuyoshi Browse this author →KAKEN DB |
| Ireland, Trevor R. Browse this author |
| Ishikawa, Akira Browse this author |
| Itoh, Shoichi Browse this author →KAKEN DB |
| Kleine, Thorsten Browse this author |
| Komatani, Shintaro Browse this author |
| Krot, Alexander N. Browse this author |
| Liu, Ming-Chang Browse this author |
| Masuda, Yuki Browse this author |
| McKeegan, Kevin D. Browse this author |
| Morita, Mayu Browse this author |
| Motomura, Kazuko Browse this author |
| Moynier, Frederic Browse this author |
| Nakai, Izumi Browse this author →KAKEN DB |
| Nguyen, Ann Browse this author |
| Nittler, Larry Browse this author |
| Onose, Morihiko Browse this author |
| Pack, Andreas Browse this author |
| Park, Changkun Browse this author |
| Piani, Laurette Browse this author |
| Qin, Liping Browse this author |
| Russell, Sara S. Browse this author |
| Schonbachler, Maria Browse this author |
| Tafla, Lauren Browse this author |
| Tang, Haolan Browse this author |
| Terada, Kentaro Browse this author →KAKEN DB |
| Terada, Yasuko Browse this author →KAKEN DB |
| Usui, Tomohiro Browse this author →KAKEN DB |
| Wada, Sohei Browse this author |
| Wadhwa, Meenakshi Browse this author |
| Walker, Richard J. Browse this author |
| Yamashita, Katsuyuki Browse this author →KAKEN DB |
| Yin, Qing-Zhu Browse this author |
| Yokoyama, Tetsuya Browse this author →KAKEN DB |
| Yoneda, Shigekazu Browse this author →KAKEN DB |
| Young, Edward D. Browse this author |
| Yui, Hiroharu Browse this author →KAKEN DB |
| Zhang, Ai-Cheng Browse this author |
| Nakamura, Tomoki Browse this author →KAKEN DB |
| Naraoka, Hiroshi Browse this author →KAKEN DB |
| Noguchi, Takaaki Browse this author →KAKEN DB |
| Okazaki, Ryuji Browse this author →KAKEN DB |
| Sakamoto, Kanako Browse this author |
| Yabuta, Hikaru Browse this author →KAKEN DB |
| Abe, Masanao Browse this author →KAKEN DB |
| Miyazaki, Akiko Browse this author |
| Nakato, Aiko Browse this author |
| Nishimura, Masahiro Browse this author |
| Okada, Tatsuaki Browse this author →KAKEN DB |
| Yada, Toru Browse this author →KAKEN DB |
| Yogata, Kasumi Browse this author |
| Nakazawa, Satoru Browse this author |
| Saiki, Takanao Browse this author →KAKEN DB |
| Tanaka, Satoshi Browse this author |
| Terui, Fuyuto Browse this author |
| Tsuda, Yuichi Browse this author →KAKEN DB |
| Watanabe, Sei-ichiro Browse this author →KAKEN DB |
| Yoshikawa, Makoto Browse this author →KAKEN DB |
| Tachibana, Shogo Browse this author →KAKEN DB |
| Yurimoto, Hisayoshi Browse this author →KAKEN DB |
| Issue Date: | Aug-2023 |
| Publisher: | Nature Portfolio |
| Journal Title: | Nature Geoscience |
| Volume: | 16 |
| Issue: | 8 |
| Start Page: | 675 |
| End Page: | 682 |
| Publisher DOI: | 10.1038/s41561-023-01226-y |
| Abstract: | The Hayabusa2 spacecraft explored asteroid Ryugu and brought its surface materials to Earth. Ryugu samples resemble Ivuna-type (CI) chondrites-the most chemically primitive meteorites-and contain secondary phyllosilicates and carbonates, which are indicative of aqueous alteration. Understanding the conditions (such as temperature, redox state and fluid composition) during aqueous alteration is crucial to elucidating how Ryugu evolved to its present state, but little is known about the temporal changes in these conditions. Here we show that calcium carbonate (calcite) grains in Ryugu and Ivuna samples have variable O-18/O-16 and C-13/C-12 ratios that are, respectively, 24-46 & PTSTHOUSND; and 65-108 & PTSTHOUSND; greater than terrestrial standard values, whereas those of calcium-magnesium carbonate (dolomite) grains are much more homogeneous, ranging within 31-36 & PTSTHOUSND; for oxygen and 67-75 & PTSTHOUSND; for carbon. We infer that the calcite precipitated first over a wide range of temperatures and oxygen partial pressures, and that the proportion of gaseous CO2/CO/CH4 molecules changed temporally. By contrast, the dolomite formed later in a more oxygen-rich and thus CO2-dominated environment when the system was approaching equilibrium. The characteristic isotopic compositions of secondary carbonates in Ryugu and Ivuna are not observed for other hydrous meteorites, suggesting a unique evolutionary pathway for their parent asteroid(s). The asteroid Ryugu experienced aqueous alteration under changing temperature and redox conditions, according to an isotopic analysis of secondary calcite and dolomite grains in samples from Ryugu obtained by the Hayabusa2 spacecraft. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/91054 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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