Physics
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...10422053m&link_type=abstract
Journal of Geophysical Research, Volume 104, Issue E9, p. 22053-22060
Physics
52
Mineralogy And Petrology: Meteorites, Planetology: Solar System Objects: Meteorites And Tektites
Scientific paper
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 ~10-4bar. 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.
Keil Klaus
Krot Alexander N.
Meibom Anders
Petaev Michail I.
Wood John A.
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