Physics
Scientific paper
Jan 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.259..189k&link_type=abstract
Nature, vol. 259, Jan. 22, 1976, p. 189, 190. NASA-supported research.
Physics
6
Iron Compounds, Reaction Kinetics, Solar Corona, Sulfides, Atmospheric Chemistry, Carbonaceous Meteorites, Condensation, Meteoritic Composition, Pyrrhotite, Solar Atmosphere, Solar Physics
Scientific paper
Noting that the iron sulfide in the Orgueil carbonaceous meteorite is an Fe-deficient monosulfide (pyrrhotite), it is suggested that such mineral chemistry is inconsistent with equilibrium condensation of the solar nebula and that the course of condensation may have been modified by kinetic effects. The effect of Ni on the reaction between Fe and S to produce FeS is examined, and possible reasons are considered for the fact that the cited meteorite differs in both crystal structure and Ni content from the predictions of equilibrium condensation. It is proposed that sulfide formation in the solar nebula may have been inhibited by sluggish diffusion, so that sulfur began to react with previously condensed troilite to form pyrrhotite. On this basis, observations of the Orgueil sulfides are shown to suggest that the course of solar-system condensation was modified by kinetic effects below about 700 K and that equilibrium may not have been achieved.
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