FeO-rich rims and veins in Allende forsterite - Evidence for high temperature condensation at oxidizing conditions

Details FeO-rich rims and veins in Allende forsterite - Evidence for high temperature condensation at oxidizing conditions FeO-rich rims and veins in Allende forsterite - Evidence for high temperature condensation at oxidizing conditions

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990metic..25..115w&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 25, June 1990, p. 115-125. Research supported by DFG.

Physics

37

Fayalite, Forsterite, Iron Oxides, Olivine, Oxidation, Chromium Oxides, High Temperature, Manganese Oxides, Microphotographs, Microstructure, Rims, Meteorites, Iron Oxide, Rims, Veins, Allende, Forsterite, Temperature, Condensation, Oxidation, Samples, Meteorite, Origin, Formation, Chromite, Fugacity, Thermal Effects, Procedure, Electron Microscopy, Solar Nebula, Laboratory Studies, Olivine, Concentration, Data, Photomicrographs, Cv3 Chondrites, C Chondrites, Stony Meteorites, Parent Bodies, Tem, Metamorphi

Scientific paper

This paper presents new data on trace elements in fayalite-rich rims, veins, halos, and matrix olivines in the Allende meteorite. On the basis of new evidence, it is argued that the fayalitic rims were formed by condensation from a gas, and not by thermal equilibration of forsterite with FeO-rich metal or FeO-rich olivine in the interior of a parent body. A similar origin is inferred for fayalitic veins within forsterite crystals. Condensation calculations showed that FeO-rich olivine can be formed by condensation from a gas with enhanced oxygen fugacity.

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