Computer Science
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999m%26ps...34..735m&link_type=abstract
Meteoritics & Planetary Science, vol. 34, no. 5, pp. 735-746 (1999).
Computer Science
44
Scientific paper
To test whether aubrites can be formed by melting of enstatite chondrites and to understand igneous processes at very low oxygen fugacities, we have conducted partial melting experiments on the Indarch (EH4) chondrite at 1000-1500 degC. Silicate melting begins at 1000 degC and Indarch is completely melted by 1500 degC. The metal-sulfide component melts completely at 1000 degC. Substantial melt migration occurs at 1300-1400 degC and metal migrates out of the silicate charge at 1450 degC and ~50% silicate partial melting. As a group, our experiments contain three immiscible metallic melts (Si-, P- and C-rich), two immiscible sulfide melts (Fe- and FeMgMnCa-rich) and silicate melt. Our partial melting experiments on the Indarch (EH4) enstatite chondrite suggest that igneous processes at low fO2 exhibit several unique features. The complete melting of sulfides at 1000 degC suggests that aubritic sulfides are not relicts. Aubritic oldhamite may have crystallized from Ca and S complexed in the silicate melt. Significant metal-sulfide melt migration might occur at relatively low degrees of silicate partial melting. Substantial elemental exchange occurred between different melts (e.g., S between sulfide and silicate, Si between silicate and metal), a feature not observed during experiments at higher fO2. This exchange may help explain the formation of aubrites from known enstatite chondrites.
Dickinson Tamara L.
Lofgren Gary E.
McCoy Timothy James
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