ポリミクトユレイライト中のCIコンドライト様クラストに含まれるオリビン・輝石の酸素３同位体比

木多 紀子; Goodrich Cyrena; Zhang Mingming; Mane Prajkta; Han Jangmi; Nguyen Ann; Zolensky Michael; Hamilton Victoria

doi:10.14862/geochemproc.72.0_121

Abstracts of Annual Meeting of the Geochemical Society of Japan

DOI https://doi.org/10.14862/geochemproc.72.0_121

Conference information

Host: Abstracts of Annual Meeting of the Geochemical Society of Japan

Name : Abstracts of Annual Meeting of the Geochemical Society of Japan

Number : 72

Date : September 07, 2025 - September 19, 2025

Oxygen 3-isotope ratios of olivine and pyroxene in CI-like clasts from polymict ureilites

*KITA T. NORIKO, Goodrich Cyrena, Zhang MIngming, Mane Prajkta, Han Jangmi, Nguyen Ann, Zolensky Michael, Hamilton Victoria

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Keywords: ureilite, CI chondrite, oxygen 3-isotope, comet

CONFERENCE PROCEEDINGS FREE ACCESS

Pages 121-

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Abstract

Polymict ureilites contain a variety of sub-mm sized xenolitic clasts including those resembles to CI chondrites (called CI-like clasts). We analyzed oxygen 3-isotope ratios of olivine and pyroxene in clasts from DaG 165 and NWA 10557 using IMS 1280 SIMS at the University of Wisconsin-Madison. The relationship between oxygen isotope ratios and Mg# (molar Mg/(Mg+Fe)%) of olivine and pyroxene are examined and compared to those of chondritic chondrules, Wild 2 comets, Ryugu and CI chondrites. Results show that olivine and pyroxene in one of clasts we studied resemble to those of comet Wild 2.

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