Chromium-bearing olivine in the St. Mesmin chondrite

Details Chromium-bearing olivine in the St. Mesmin chondrite Chromium-bearing olivine in the St. Mesmin chondrite

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975gecoa..39.1621d&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 39, Dec. 1975, p. 1621-1627.

Computer Science

Chondrites, Chromium Oxides, Meteoritic Composition, Olivine, Breccia, Calcium Oxides, Electron Microscopes, Iron Oxides, Meteoritic Microstructures

Scientific paper

Olivine phenocrysts in microporphyritic xenoliths in the St. Mesmin chondrite (LL-breccia) show parallel rimward variations of FeO, CaO; MnO, and Cr2O3. Aluminum is near background levels and does not vary systematically with iron. Titanium, sodium and nickel are below the limit of detection. Covariation of Fe and Cr in this olivine distinguishes it from the olivines in lunar mare basalts, in which Cr varies inversely with Fe. Transmission electron microscopy of the St. Mesmin olivine suggests that it is free of submicroscopic inclusions and exsolution lamellae, and that the chromium present occurs in solid solution in the olivine. Charge balance and ionic radius considerations suggest that it occurs as Cr(2+), whose effective ionic radius is nearly identical to that of Mn(2+). The different Fe-Cr relationships observed in the lunar basaltic and St. Mesmin olivines reflect different crystallization sequences.

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