Determination of the Fe oxidation state of the Chassigny kaersutite: A microXANES spectroscopic study
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CitationMonkawa, A., Mikouchi, T., Koizumi, E., Sugiyama, K., & Miyamoto, M. (2006). Determination of the Fe oxidation state of the Chassigny kaersutite: A microXANES spectroscopic study. Meteoritics & Planetary Science, 41(9), 1321-1329.
PublisherThe Meteoritical Society
JournalMeteoritics & Planetary Science
AbstractIn order to elucidate the formation of low-H kaersutites in Martian meteorites, the Fe3+/Sigma-Fe ratio of Chassigny kaersutites in magmatic inclusions was directly determined by the synchrotron microXANES analysis. XANES analysis for standard kaersutites with known Fe3+/Sigma-Fe ratios shows a linear relationship between centroid energy positions of XANES pre-edge spectra and the Fe3+/Sigma-Fe ratio. Based on the linear relationship, the Fe3+/Sigma-Fe ratio of Chassigny kaersutites is estimated to be about 0.05. The low Fe3+/Sigma-Fe ratio clearly suggests that low-H kaersutites in Chassigny are not likely to be formed by the oxidation-dehydrogenation reactions. The low-H content of the Chassigny kaersutites is mainly due to the presence of a Ti oxy-component.