Magnesium and chromium isotope systematics of Allende CAIs

山下 勝行; Josh Wimpenny; Matthew Sanborn; 丸山 誠史; Qing-zhu Yin

doi:10.14862/geochemproc.61.0_169

Abstracts of Annual Meeting of the Geochemical Society of Japan

Session ID : 3A03

DOI https://doi.org/10.14862/geochemproc.61.0_169

Conference information

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

Magnesium and chromium isotope systematics of Allende CAIs

*Katsuyuki Yamashita, Josh Wimpenny, Matthew Sanborn, Seiji Maruyama, Qing-zhu Yin

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Keywords: Magnesium, Chromium, Isotope, CAI, Allende

CONFERENCE PROCEEDINGS FREE ACCESS

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Abstract

High-precision Mg and Cr isotope data of five CAIs from Allende will be presented. The δMg* of all CAIs shows strong correlation with the Al/Mg ratio, defining a line with a slope that translates to 26Al/27Al of ~5 x 10-5. The Cr from the spherical CAIs shows anomalies in both ε53Cr and ε54Cr, with ε53Cr correlating with 55Mn/52Cr. Further chronological implications, as well as the petrological properties of the CAIs will be discussed.

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