Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences
2018 Annual Meeting of Japan Association of Mineralogical Sciences
Session ID : R5-20
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Host: Japan Association of Mineralogical Sciences

R5: Extraterrestrial materials
Fe3+/ΣFe ratios in CM chondrites
*Takaaki Noguchi, Ryosuke Sagae, Hidemi Ishibashi, Shoko Odake, Hiroyuki Kagi, Masahide Akasaka, Makoto Kimura, Akira Yamaguchi
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Keywords: XANES, Mossbauer spectroscopy, Serpentine, CM chondrites
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Abstract

By combining Fe Kα XANES analysis, 57Fe Mossbauer spectroscopy, and EPMA analysis of cronstedtite, we were able to transform the Fe3+/Fe2+ area intensity ratios to the Fe3+/Fe2+ atomic ratios for serpentine-group minerals (Fe-rich serpentine and cronstedtite). By using this relationship, we applied Fe Kα XANES analysis of serpentine-group minerals in 11 CM chondrites. There is a weak positive correlation between Fe*/(Mg+Fe*) ratios and Fe3+/ΣFe atomic ratios if we use the average values of these ratios for each meteorite.

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