Hypervelocity collision and water-rock interaction in space preserved in the Chelyabinsk ordinary chondrite(Article)(Open Access)
- aThe Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University, Tottori, Japan
- bDepartment of Earth and Environmental Sciences, Lehigh University, Bethlehem, PA, United States
- cGraduate School of Natural Sciences, Nagoya City University, Nagoya, Japan
- dInstitute of Low Temperature Science, Hokkaido University, Sapporo, Japan
- eInstitute of Physics and Technology, Ural Federal University, Yekaterinburg, Russian Federation
- fInstitute of Mineralogy, Ural Branch of the Russian Academy of Sciences, Miass, Russian Federation
- gSouth-Ural State University, Chelyabinsk, Russian Federation
- hV.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russian Federation
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 930Ma 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 O 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. © 2019 The Japan Academy.
Indexed keywords
| EMTREE drug terms: | water |
|---|---|
| EMTREE medical terms: | astronomychemistry |
| MeSH: | Earth (Planet)Evolution, PlanetaryMeteoroidsWater |
Chemicals and CAS Registry Numbers:
water, 7732-18-5;
Water
Funding details
| Funding sponsor | Funding number | Acronym |
|---|---|---|
| Japan Society for the Promotion of Science See opportunities by JSPS | 16K05578,17K05706 | JSPS |
| Japan Society for the Promotion of Science See opportunities by JSPS | JSPS |
- ISSN: 03862208
- Source Type: Journal
- Original language: English
- DOI: 10.2183/pjab.95.013
- PubMed ID: 30971619
- Document Type: Article
- Publisher: Japan Academy
Nakamura, E.; The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University, 827 Yamada, Misasa, Tottori, Japan;
© Copyright 2019 Elsevier B.V., All rights reserved.
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