Fe3+ in shocked olivine crystals of the ALHA 77005 meteorite

Details Fe3+ in shocked olivine crystals of the ALHA 77005 meteorite Fe3+ in shocked olivine crystals of the ALHA 77005 meteorite

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..67..162o&link_type=abstract

Earth and Planetary Science Letters, Volume 67, Issue 2, p. 162-166.

Physics

34

Scientific paper

ALHA 77005, a shocked achondrite of the shergottite group, is unique in containing cumulus olivine crystals which display a brownish color in thin section. Mössbauer, EPR, and optical spectroscopic studies show the presence of Fe3+ in the olivine. Approximately 4.5 wt.% of the total iron in the olivine (24 wt.% as FeO) is in the trivalent state. The Fe3+ ions preferentially occupy M2 lattice positions. Charge transfer between Fe3+ and Fe2+ as well as between Fe3+ and oxygen ligands causes a broad absorption band in the optical spectrum at high energies which is the reason for the olivine color. It is concluded that the color of the ALHA 77005 olivine is preterrestrial and may be the result of shock-induced oxidation of the olivine crystals on the meteorite parent body.

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