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Formation of iron sulphide in solar nebula

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Abstract

IODINE–XENON dating has established that iron sulphide in the Orgueil carbonaceous meteorite is one of the oldest known meteoritic mineral phases, and probably dates from the condensation stage of the early Solar System1. This sulphide, although generally assumed to be troilite, FeS, is in fact the Fe-deficient monosulphide, pyrrhotite, (Fe,Ni)9S10, containing ∼ 1 weight % Ni (ref. 2). The purpose of this note is to suggest that such mineral chemistry is inconsistent with equilibrium condensation, and that the course of condensation may have been modified by kinetic effects.

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Authors and Affiliations

  1. Institute of Geophysics, University of California, Los Angeles, California, 90024

    JOHN F. KERRIDGE

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  1. JOHN F. KERRIDGE
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KERRIDGE, J. Formation of iron sulphide in solar nebula. Nature 259, 189–190 (1976). https://doi.org/10.1038/259189a0

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  • DOI: https://doi.org/10.1038/259189a0

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