ID 57944
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Nakamura, Eizo The Pheasant Memorial Laboratory, Institute for Planetary Materials, Okayama University Kaken ID publons researchmap
Kunihiro, Tak The Pheasant Memorial Laboratory, Institute for Planetary Materials, Okayama University Kaken ID
Ota, Tsutomu The Pheasant Memorial Laboratory, Institute for Planetary Materials, Okayama University ORCID Kaken ID publons researchmap
Sakaguchi, Chie The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University publons
Tanaka, Ryoji The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University ORCID Kaken ID publons researchmap
Kitagawa, Hiroshi Okayama Univ, Inst Planetary Mat, Pheast Mem Lab Geochem & Cosmochem ORCID publons researchmap
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
Abstract
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.
Keywords
ordinary chondrite
chronology
geochemistry
impact melting
asteroid
comet
Published Date
2019-04-11
Publication Title
Proceedings of the Japan Academy, Ser. B Physical and Biological Sciences
Volume
volume95
Issue
issue4
Start Page
165
End Page
177
ISSN
0386-2208
Content Type
Journal Article
language
英語
OAI-PMH Set
岡山大学
Copyright Holders
© 2019 The Japan Academy
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Web of Science KeyUT
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isVersionOf https://doi.org/10.2183/pjab.95.013
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