The Kaidun meteorite: Mineralogy of an unusual CM1 lithology

Details The Kaidun meteorite: Mineralogy of an unusual CM1 lithology The Kaidun meteorite: Mineralogy of an unusual CM1 lithology

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996m%26ps...31..484z&link_type=abstract

Meteoritics, vol. 31, pages 484-493.

Mathematics

Logic

14

Scientific paper

Kaidun is a breccia of disparate enstatite and carbonaceous chondrite clasts that continues to provide real surprises. Many Kaidun clasts have been intensely altered by aqueous fluids, as evidenced by the widespread occurrence of ferromagnesian phyllosilicates and by the presence of carbonate- and phyllo-silicate-filled veins. In this report, we describe an unusual CM lithology containing many mineralogical features not previously reported from any meteorite, including pyrrhotite, with exclusive needlelike morphologies and thick mantles of phyllosilicate, and complex aggregates of phyllosilicate, melanite garnet, crosscut by pentlandite veins. The latter features appear to be due in large part to extensive hydrothermal alteration at temperatures on the order of 450 C, which is significantly higher than that attained during secondary processing from other known CM material.

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