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Detailed Reference Information |
Meibom, A., Petaev, M.I., Krot, A.N., Wood, J.A. and Keil, K. (1999). Primitive FeNi metal grains in CH carbonaceous chondrites formed by condensation from a gas of solar composition. Journal of Geophysical Research 104: doi: 10.1029/1999JE001052. issn: 0148-0227. |
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Some FeNi metal grains, ~150 μm in apparent diameter, in CH carbonaceous chondries are concentrically zoned in Ni(~5--10 wt%), Co(0.2--0.4 wt%), and Cr(0.3--0.8 wt%). Silicons present at the ~0.1 wt% level. These observations are consistent with predicted gas-solid conlensation from a gas of solar composition at temperatures of ~1370--1270 K and total pressure of ~10-4 bar. Estimates of FeNi metal grain growth and cooling rates in this temperature range are consistent with brief and localized thermal episodes in the solar nebula. Compositionally similar FeNi metal grains have also been reported in CR and Bencubbin-like chondrites. Because FeNi metal is highly susceptible to secondary alteration (i.e., metamorphism, melting, oxidation), the observed FeNi metal condensates in CH, Bencubbin-like, and CR chondrites indicate that these meteorites experienced no thermal processing after their lithification and thus are among the most primitive meteorites in our collections. ¿ 1999 American Geophysical Union |
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Abstract |
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Keywords
Mineralogy and Petrology, Meteorites, Planetology, Solar System Objects, Meteorites and tektites |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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