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- W1979080690 abstract "The metallographic structures of eight severely reheated chondrites (Farmington, Ramsdorf, Orvinio, Wickenburg, Lubbock, Rose City, Arapahoe and Tadjera) have been studied by optical, scanning electron microscope and electron microprobe techniques. Unreheated chondrites and experimentally heat treated chondritic material have also been examined. The following metallographic characteristics can be used to estimate the post-shock residual temperature of reheated chondrites: melted appearance of metal-troilite, presence of martensite, P enrichment of the metal, and the averaging of central metal grain compositions. Metallographic characteristics used to estimate the cooling rates of the severely reheated chondrites are the Ni content of troilite, the Ni gradients in metal grain rims, and the presence of secondary kamacite and phosphides. Farmington, Ramsdorf, Orvinio, Lubbock, Rose City and several of the heat treatment specimens have substantial P in solution in the metal grains ( > 0.1 wt%). P enrichment is apparently caused by reduction of phosphates upon severe reheating and partial melting of metal-troilite areas in chondritic meteorites. The eight severely reheated chondrites studied showed evidence of reheating to temperatures ranging from ∼ 950°C to ∼ 1250°C. Ramsdorf has the highest reheating temperature (1200–1250°C) and the fastest cooling rate ∼ 100°C/day. Wickenberg has the lowest reheating temperature (950–1000°C) and the slowest cooling rate, ∼ 1°C/100yrs. Cooling rate estimates correspond to post-reheating burial depths of less than 1 to ∼ 1000m." @default.
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- W1979080690 title "The metallic microstructures and thermal histories of severely reheated chondrites" @default.
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- W1979080690 doi "https://doi.org/10.1016/0016-7037(77)90100-4" @default.
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