Computer Science
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.1511f&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 51, June 1987, p. 1511-1521. NSERC-supported research.
Computer Science
5
Chemical Reactions, Chondrites, Enstatite, Magnesium Compounds, Olivine, Graphite, Iron Compounds, Nickel Compounds, Phase Transformations, Meteorites, Enstatites, E Chondrites, Stony Meteorites, Niningertite, Stability, Magnesium, Olivine, Mineralogy, Laboratory Studies, Origin, Chemistry, Sulfur, Procedure, Experiments, Phases, Partitioning, Calculations, Quenching, Texture, Nickel, Formation, Crystallization, Accretion, Metamorphism
Scientific paper
When Mg-rich olivine is heated with excess (Fe,Ni) monosulfide and graphite in a sealed silica vessel at 1200 C, it is sulfidized to niningerite and clinoenstatite. The quenched experimental assemblage of clinoenstatite + troilite + niningerite + alloy + silicide + graphite is equivalent to the reduced mineral assemblage of EH enstatite chondrites. The present phase relations suggest that niningerite in EH chondrites could have been produced by sulfidation of Mg-rich silicates during either accretion or metamorphism at low CO fugacities; niningerite, however, is unstable under the anticipated conditions of recrystallization of EL enstatite chondrites.
Fleet Michael E.
Macrae Neil D.
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