Analysis of impact-induced Fe2+ disorder in the pyroxene of the Ibitira meteorite

Details Analysis of impact-induced Fe2+ disorder in the pyroxene of the Ibitira meteorite Analysis of impact-induced Fe2+ disorder in the pyroxene of the Ibitira meteorite

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hyint..67..463c&link_type=abstract

Hyperfine Interactions, Volume 67, Issue 1-4, pp. 463-466

Computer Science

Scientific paper

Mössbauer spectroscopy and X-ray diffraction analysis indicate that the only iron compound present in the Ibitira meteorite is the pyroxene (Mg, Fe, Ca)2Si2O6 known as pigeonite [1]. The Mössbauer spectrum shows Fe2+ in the two different crystallographic sites, M1 and M2, and the population ratio Fe2+ (M1)/Fe2+ (M2) indicates a reasonable degree of cation order. Comparison between our results and results obtained from pyroxene shocked under controlled conditions in the laboratory [2] suggests that, the meteorite was subjected to a impact of low intensity.

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