Magnetite-sulfide chondrules and nodules in CK carbonaceous chondrites - Implications for the timing of CK oxidation

Details Magnetite-sulfide chondrules and nodules in CK carbonaceous chondrites - Implications for the timing of CK oxidation Magnetite-sulfide chondrules and nodules in CK carbonaceous chondrites - Implications for the timing of CK oxidation

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993metic..28..130r&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 28, no. 1, p. 130-135.

Physics

4

Carbonaceous Chondrites, Chondrule, Magnetite, Meteoritic Microstructures, Sulfides, Mineralogy, Optical Microscopes, Oxidation, Petrography, Meteorites, Stony Meteorites, Chondrites, C Chondrites, Ck Chondrites, Chondrules, Nodules, Magnetite, Sulfide, Description, Chalcopyrite, Oxidation, Silicate, Origin, Formation, Shock Effects, Procedure, Laboratory Studies, Antarctic Meteorites, Microscopy, Alh Meteorites, Eet Meteorites, Lew Meteorites, Pca Meteorites, Samples, Meteorite, Petrography, Physical Prope

Scientific paper

CK carbonaceous chondrites contain rare (about 0.1 vol pct) magnetite-sulfide chondrules that range from about 240 to 500 microns in apparent diameter and have ellipsoidal to spheroidal morphologies, granular textures, and concentric layering. They resemble the magnetite-sulfide nodules occurring inside mafic silicate chondrules in CK chondrites. It seems likely that the magnetite-sulfide chondrules constitute the subset of magnetite-sulfide nodules that escaped as immiscible droplets from their molten silicate chondrule hosts during chondrule formation. The intactness of the magnetite-sulfide chondrules and nodules implies that oxidation of CK metal occurred before agglomeration. Hence, the pervasive silicate darkening of CK chondrites was caused by the shock mobilization of magnetite and sulfide, not metallic Fe-Ni and sulfide as in shock-darkened ordinary chondrites.

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