Fe(3+) in shocked olivine crystals of the ALHA 77005 meteorite

Details Fe(3+) in shocked olivine crystals of the ALHA 77005 meteorite Fe(3+) in shocked olivine crystals of the ALHA 77005 meteorite

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..67..162o&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 67, no. 2, Feb. 1983, p. 162-166. Research supported by the Deutsche

Computer Science

Achondrites, Iron, Meteoritic Composition, Olivine, Absorption Spectra, Crystal Lattices, Electron Transitions, Mars (Planet), Positive Ions, Spectrum Analysis, X Ray Diffraction

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. Moessbauer, electron paramagnetic resonance, and optical spectroscopic studies show the presence of Fe(3+) in the olivine. Approximately 4.5 wt percent of the total iron in the olivine (24 wt percent as FeO) is in the trivalent state. The Fe(3+) ions preferentially occupy M2 lattice positions. Charge transfer between Fe(3+) and Fe(2+) as well as between Fe(3+) 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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