Determination of the Fe oxidation state of the Chassigny kaersutite: A microXANES spectroscopic study

Details Determination of the Fe oxidation state of the Chassigny kaersutite: A microXANES spectroscopic study Determination of the Fe oxidation state of the Chassigny kaersutite: A microXANES spectroscopic study

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006m%26ps...41r1271m&link_type=abstract

Meteoritics & Planetary Science, vol. 41, Issue 9, p.1271-1419

Computer Science

Scientific paper

In order to elucidate the formation of low-H kaersutites in Martian meteorites, the Fe3+/ΣFe ratio of Chassigny kaersutites in magmatic inclusions was directly determined by the synchrotron microXANES analysis. XANES analysis for standard kaersutites with known Fe3+/ΣFe ratios shows a linear relationship between centroid energy positions of XANES pre-edge spectra and the Fe3+/ΣFe ratio. Based on the linear relationship, the Fe3+/ΣFe ratio of Chassigny kaersutites is estimated to be about 0.05. The low Fe3+/ΣFe 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.

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