Mafic silicates in the Orgueil carbonaceous meteorite

Computer Science

Scientific paper

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Abundance, Iron, Meteoritic Composition, Orgueil Meteorite, Silicates, Calcium, Carbonaceous Meteorites, Cosmology, Crystallization, Meteoritic Microstructures, Olivine, Pyroxenes

Scientific paper

Iron-bearing olivines and pyroxenes occurring in Orgueil may represent a separate population distinct from the magnesian varieties previously reported. Compositions of these iron-bearing silicates are inconsistent with an origin by direct equilibrium condensation in the nebula. Such an origin is more plausible for the magnesian silicates, but lacks conclusive evidence. An extra-solar system origin for either mafic population is possible, though similarly lacking in evidence. About 15% of the olivines, randomly distributed with respect to iron content, retain particle track evidence of a precompaction irradiation.

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