Yamato-81020（CO3），Murchison（CM2），Cold Bokkeveld（CM2）コンドライトに含まれるCI に似た微小クラスト

森家 智嗣; 留岡 和重; 瀬戸 雄介; 前田 誠; 三宅 亮; 浜根 大輔

doi:10.14824/jakoka.2014.0_154

2014 Annual Meeting of Japan Association of Mineralogical Sciences

Session ID : R5-08

DOI https://doi.org/10.14824/jakoka.2014.0_154

Conference information

Host: Japan Association of Mineralogical Sciences

R5: Extraterrestrial materials

CI-like clasts in the Yamato-81020 CO3 chondrite and the Murchison and Cold Bokkeveld CM2 chondrites

*Satoshi Moriya, Kazushige Tomeoka, Yusuke Seto, Makoto Maeda, Akira Miyake, Daisuke Hamane

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Keywords: Aqueous alteration, CI chondrite, CO chondrite, CM chondrite, breccia

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Abstract

We found the fine grained, heavily-hydrated microclasts in a CO chondrite (Y-81020) and CM chondrites (Murchison and Cold Bokkeveld). SR-XRD analyses and high resolution TEM observations revealed that the clasts in Y-81020 consists mainly olivine and magnetite, with small amounts of smectite and serpentine. The clasts in Murchison and Cold Bokkeveld consists mainly magnetite and serpentine in which crystalline olivine were not observed. Most of clasts in three meteorites contain framboidal or platelet magnetite, which are typical morphology in CI chondrite. These results suggest that the clasts had been altered by aqueous alteration under a condition similar to CI chondrites.

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