ID | 57944 |
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著者 |
Nakamura, Eizo
The Pheasant Memorial Laboratory, Institute for Planetary Materials, Okayama University
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Kunihiro, Tak
The Pheasant Memorial Laboratory, Institute for Planetary Materials, Okayama University
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Ota, Tsutomu
The Pheasant Memorial Laboratory, Institute for Planetary Materials, Okayama University
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Sakaguchi, Chie
The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
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Tanaka, Ryoji
The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
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Kitagawa, Hiroshi
Okayama Univ, Inst Planetary Mat, Pheast Mem Lab Geochem & Cosmochem
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Kobayashi, Katsura
The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
Yamanaka, Masahiro
The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
Shimaki, Yuri
The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
Bebout, Gray E.
The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
Miura, Hitoshi
Graduate School of Natural Sciences, Nagoya City University
Yamamoto, Tetsuo
Institute of Low Temperature Science, Hokkaido University
Malkovets, Vladimir
The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
Grokhovsky, Victor
Institute of Physics and Technology, Ural Federal University
Koroleva, Olga
Institute of Mineralogy, Ural Branch of the Russian Academy of Sciences South-Ural State University
Litasov, Konstantin
V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences
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抄録 | A comprehensive geochemical study of the Chelyabinsk meteorite reveals further details regarding its history of impact-related fragmentation and melting, and later aqueous alteration, during its transit toward Earth. We support an similar to 30 Ma age obtained by Ar-Ar method (Beard et al., 2014) for the impact-related melting, based on Rb-Sr isotope analyses of a melt domain. An irregularly shaped olivine with a distinct 0 isotope composition in a melt domain appears to be a fragment of a silicate-rich impactor. Hydrogen and Li concentrations and isotopic compositions, textures of Fe oxyhydroxides, and the presence of organic materials located in fractures, are together consistent with aqueous alteration, and this alteration could have pre-dated interaction with the Earth's atmosphere. As one model, we suggest that hypervelocity capture of the impact-related debris by a comet nucleus could have led to shock-wave-induced supercritical aqueous fluids dissolving the silicate, metallic, and organic matter, with later ice sublimation yielding a rocky rubble pile sampled by the meteorite.
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キーワード | ordinary chondrite
chronology
geochemistry
impact melting
asteroid
comet
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発行日 | 2019-04-11
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出版物タイトル |
Proceedings of the Japan Academy, Ser. B Physical and Biological Sciences
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巻 | 95巻
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号 | 4号
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開始ページ | 165
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終了ページ | 177
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ISSN | 0386-2208
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資料タイプ |
学術雑誌論文
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言語 |
英語
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OAI-PMH Set |
岡山大学
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著作権者 | © 2019 The Japan Academy
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論文のバージョン | publisher
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関連URL | isVersionOf https://doi.org/10.2183/pjab.95.013
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Citation | Eizo NAKAMURA, Tak KUNIHIRO, Tsutomu OTA, Chie SAKAGUCHI, Ryoji TANAKA, Hiroshi KITAGAWA, Katsura KOBAYASHI, Masahiro YAMANAKA, Yuri SHIMAKI, Gray E. BEBOUT, Hitoshi MIURA, Tetsuo YAMAMOTO, Vladimir MALKOVETS, Victor GROKHOVSKY, Olga KOROLEVA, Konstantin LITASOV, Hypervelocity collision and water-rock interaction in space preserved in the Chelyabinsk ordinary chondrite, Proceedings of the Japan Academy, Series B, 2019, Volume 95, Issue 4, Pages 165-177, Released April 11, 2019, Online ISSN 1349-2896, Print ISSN 0386-2208, https://doi.org/10.2183/pjab.95.013
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