Computer Science
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.1649k&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 53, July 1989, p. 1649-1655.
Computer Science
3
Chondrites, Iron Meteorites, Meteoritic Composition, Zincblende, Cooling, Electron Microscopes, Thermal Diffusion, Trace Elements, Meteorites, Enstatites, E Chondrites, Sphalerite, Temperature, Pressure, Yamato Meteorites, Yamato 69001, Samples, Meteorite, Cooling, Pillistfer, Indarch, Laboratory Studies, Photomicrographs, Iron, Alh Meteorites, Alha77295, Qingzhen, Thermal History, Equilibrium
Scientific paper
Thirteen enstatite chondrites and two aubrites were examined for the presence of sphalerite, which was found and analyzed in four of these samples, including ALHA77295, Qingzhen (EH3), Pillistfer (EL6), and Indarch (EH4). The analyses of these sphalerites allow the application of the sphalerite cosmobarometer to the enstatite chondrites. Assuming nebular conditions and zero pressure, the blocking temperatures for the diffusion of iron, T(B), and the cooling rates for these meteorites were calculated. Differences in iron content were found in sphalerites from EH3, EH4, and EL6, considered to be related to differences in their thermal histories. Results indicate that the EH4 chondrite has cooled at an extremely rapid rate and has an unreasonably high T(B). Data for the EL6 chondrites were consistent with relatively slow cooling ca. 773 K, whereupon rapid cooling occurred.
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