Computer Science
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990e%26psl.101..180p&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 101, no. 2-4, Dec. 1990, p. 180-195.
Computer Science
57
Condensation, High Temperature Environments, Iron Meteorites, Meteoritic Composition, Olivine, Solar Corona, Allende Meteorite, Chondrites, Iron Oxides, Silicates
Scientific paper
The origin of oxidized iron in chondritic meteorites is a fundamental problem in meteoritics. Conventional models of meteorite formation assume FeO incorporation into olivine and pyroxene at around 500 K. There is evidence that at least some fayalitic olivine in Allende must have formed by condensation. Thermodynamic equilibrium calculations presented here define the nebular conditions that would enable condensation of fayalitic olivine: temperatures of about 1400 K at 0.001 atm. and 1200 K at about 0.000001 atm. and oxygen fugacities several orders of magnitude higher than those conventionally assumed are required. Kinetic constraints on the formation of FeO-bearing silicates support the high-temperature formation of FeO-rich olivine. The conclusion is inescapable that conditions in the early solar nebula were, at least in some parts or at some times, rather oxidizing.
Fegley Bruce Jr.
Palme Herbert
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