P-T-oxygen fugacity relations in the system Fe-O-MgO-SiO 2

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ID: 298824
1968
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Abstract
The T-oxygen fugacity equilibrium for the system has been developed for a semi-quantitative T-oxygen fugacity petrogenic grid applicable to both basic igneous rocks and to meteorites. Olivine-silica-pyroxene-metallic iron-liquid exist at 1305 degrees C and 10 (super -11.8) atm (1 atm total), and in the system Fe-O-SiO ~2~ at 17.5 kb, 1280 degrees C, and 10 (super -10.8) atm oxygen fugacity. Subsolidus Mg enrichment of the silicate phases occurs with decreasing T and increasing oxygen fugacity in the magnetite-bearing assemblages at 1 atm. For iron-bearing assemblages, a T increase and oxygen fugacity decrease leads to Mg enrichment of the silicate phase. These phases can be divided by a region in which neither Mg nor metallic iron are stable, and transition between the two is unlikely.
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Authors D. H. Speidel, R. H. Nafziger
Journal american journal of science
Year 1968
DOI
10.2475/ajs.266.5.361
URL
https://ajs.scholasticahq.com/article/59237.pdf
Keywords Keywords not found

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