A shock-metamorphic model for silicate darkening and compositionally variable plagioclase in CK and ordinary chondrites

Details A shock-metamorphic model for silicate darkening and compositionally variable plagioclase in CK and ordinary chondrites A shock-metamorphic model for silicate darkening and compositionally variable plagioclase in CK and ordinary chondrites

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.1705r&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 56, April 1992, p. 1705-1714.

Computer Science

50

Carbonaceous Chondrites, Grain Boundaries, Hypersonic Shock, Metamorphic Rocks, Silicates, Chemical Composition, Magnetite, Olivine

Scientific paper

The paper addresses the question of whether silicate darkening in CK and ordinary (OC) chondrites had the same cause, as well as the cause of the large compositional variability in CK chondrites. It is proposed that magnetite and pentlandite in CK chondrites were mobilized during shock metamorphism and dispersed through silicate interiors; alternatively, metal and troilite may have been dispersed and then transformed into magnetite and pentlandite during subsequent oxidation of these chondrites. The low impedance of plagioclase to shock compression makes it particularly susceptible to melting and mobilization, which is consistent with the molten appearance of plagioclase in highly shocked OC. The common association of silicate darkening with compositionally variable plagioclase is consistent with the hypothesis that both are products of shock metamorphism. It is concluded that a few CK chondrites that contain olivine with undulose or mosaic extinction may have been shocked again, after annealing.

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