Petrology of nine ordinary chondrite falls from China

Details Petrology of nine ordinary chondrite falls from China Petrology of nine ordinary chondrite falls from China

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987metic..22...97w&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 22, March 31, 1987, p. 97-104.

Physics

6

Chondrites, Petrology, Annealing, Breccia, China, Mineralogy, Olivine, Petrography, Pyroxenes, Silicates, Meteorites, Ordinary Chondrites, Stony Meteorites, Samples, Meteorite, Petrology, Classification, Description, Nantong, H Chondrites, Zaoyang, Zhaodong, L Chondrites, Qidong, Ll Chondrites, Raoyang, Sheyang, Data, Guangnan, Suizhou, Nan Yang Pao, Mineralogy, Breccias, Lithification, Formation, Shock Effects, Kamacite, Silicate, Annealing, Crystallization, Analysis, Laboratory Studies, Procedure, Olivine

Scientific paper

Nine twentieth-century ordinary chondrite falls from China are described and classified. They include: Nantong (H6), Zaoyang (H5), Zhaodong (L4), Qidong (L-LL5), Raoyang (L6), Sheyang (L6), Guangnan (L6), Suizhou (L6) and Nan Yang Pao (L6). Kamacite in Qidong is rare and contains much more Co (15 mg/g) than is characteristic of L-group chondrites; Qidong may be a member of a chondrite group intermediate in its properties between L and LL. Zhaodong, Qidong, Raoyang, Sheyang and Suizhou have several olivine and/or low-Ca pyroxene grains with aberrant Fe/(Fe + Mg) ratios; it is probable that these five chondrites are fragmental breccias. The lack of correlation between shock facies and occurrence of aberrant silicate grains suggests that breccia lithification caused only minimal shock effects in many meteorites. Alternatively, postshock annealing may have resulted in the recrystallization of shock-indicating phases, leading to assignment of a shockfacies that is lower than that present immediately after the shock event.

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