The metallic microstructures and thermal histories of severely reheated chondrites

Details The metallic microstructures and thermal histories of severely reheated chondrites The metallic microstructures and thermal histories of severely reheated chondrites

Aug 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977gecoa..41.1061s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 41, Aug. 1977, p. 1061-1065, 1067-1072.

Computer Science

43

Chondrites, Metal Particles, Metamorphism (Geology), Meteoritic Microstructures, Heat Treatment, Metallography, Shock Heating, Thermal Energy

Scientific paper

The metallographic structures of eight severely reheated chondrites - Farmington, Ramsdorf, Orvinio, Wickenburg, Lubbock, Rose City, Arapahoe, and Tadjera - were studied using optical, SEM and electron microprobe techniques. The following metallographic criteria were used to estimate the post-shock residual temperature of the chondrites: melted metal-troilite appearance, presence of martensite, phosphorus enrichment of metal and averaging of central metal grain compositions. The presence of phosphides and secondary kamacite are due to slow post-shock cooling rates. Ni rim gradients indicate both extensive remelting of metal grains and relatively fast cooling.

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