Metallic minerals, thermal histories and parent bodies of some xenolithic, ordinary chondrite meteorites

Details Metallic minerals, thermal histories and parent bodies of some xenolithic, ordinary chondrite meteorites Metallic minerals, thermal histories and parent bodies of some xenolithic, ordinary chondrite meteorites

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981gecoa..45...53s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 45, Jan. 1981, p. 53-67.

Mathematics

Logic

29

Chondrites, Metallography, Meteoritic Composition, Mineralogy, Iron Meteorites, Metamorphism (Geology), Meteoritic Microstructures, Petrology, Procedure, Metallography, Photomicrographs, Data, Mezo-Madaras Meteorite, Nickel, Concentrations, Bhola Meteorite, Chronology, Zones, Meteorites, Chondrites, Metals, Minerals, Thermal History, Parent Bodies, Xenoliths, Grains, Petrology, Microscopic Analysis, Electron Microprobe, Weston Meteorite, Fayetteville Meteorite, Solar Wind, Solar Flare Tracks, Kamacite, Taen

Scientific paper

The metal grains were investigated in the hosts and lithic fragments of various petrologic types in four xenolithic chondrites using reflected-light microscopy and electron-probe analysis. The kamacite, taenite, tetrataenite, and troilite in Weston and Fayetteville have many textures; on a Wood plot of the central Ni content vs dimensions, the taenite content shows scatter if metal grains had cooled at rates of 10-1000 and 1-100 K/Myr through 700 K. In contrast, metallic minerals in Bhola and Mezo-Madaras have uniform textures and plot coherently, indicating cooling rates of 0.1 and 1 K/Myr, respectively, in the 700-600 K range. It is concluded that the host and xenoliths in these chondrites were cooled slowly after compaction; their clasts underwent peak metamorphic temperatures and slow cooling through 700 K in different environments.

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