Reduction during metamorphism of four ordinary chondrites

Details Reduction during metamorphism of four ordinary chondrites Reduction during metamorphism of four ordinary chondrites

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.1867w&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 57, no. 8, p. 1867-1878.

Computer Science

11

Chondrites, Metamorphism (Geology), Meteoritic Composition, Olivine, Chemical Composition, Neutron Activation Analysis, Petrography, Meteorites, Stony Meteorites, Chondrites, Ordinary Chondrites, Reduction, Metamorphism, Willaroy, Suwahib (Buwah), Moorabie, Cerro Los Calvos, Lithophiles, Refractory Material, Description, Composition, Hypotheses, H Chondrites, L Chondrites, Samples, Meteorite, Weathering, Procedure, Laboratory Studies, Comparison, Abundance, Petrography, Models, Oxygen, Isotopes

Scientific paper

Three type 3 reduced chondrites (Willaroy, Buwah, and Moorabie) and one type 4 find (Cerro los Calvos) were studied by instrumental neutron-activation analysis and petrographic techniques in order to determine if they are in fact ordinary chondrites (OCs) differing from most known OCs only in their lower redox state, as was suggested in earlier investigations. Particular consideration was given to obtaining phase composition data bearing on the nature and timing of the hypothesized reduction event. On the basis of the results obtained, it is concluded that the most plausible explanation of the chondrites' properties is that these OCs were incorporated into and metamorphosed in chemical contact with a reduced host regolith.

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