Abstract
Results of chemical analyses of glasses produced in 46 melting experiments in air at 1,350° C and 1,450° C on rocks ranging in composition from nephelinite to rhyolite have been combined with other published data to obtain an empirical equation relating in \((X_{{\text{Fe}}_{\text{2}} {\text{O}}_{\text{3}} }^{{\text{liq}}} /X_{{\text{FeO}}}^{{\text{liq}}} )\) to T, \(\ln f_{{\text{O}}_{\text{2}} } \) and bulk composition. The whole set of experimental data range over 1,200–1,450° C and oxygen fugacities of 10−9.00 to 10−0.69 bars, respectively. The standard errors of temperature and \(\log _{10} f_{{\text{O}}_{\text{2}} } \) predictions from this equation are 52° C and 0.5 units, respectively, for 186 experiments.
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On leave from University of Cincinnati, Cincinnati, Ohio 45221
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Kilinc, A., Carmichael, I.S.E., Rivers, M.L. et al. The ferric-ferrous ratio of natural silicate liquids equilibrated in air. Contr. Mineral. and Petrol. 83, 136–140 (1983). https://doi.org/10.1007/BF00373086
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DOI: https://doi.org/10.1007/BF00373086