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We performed a series of experiments at 1 atm pressure and temperatures of 1300–1500 °C to determine the effect of oxygen fugacity on the oxidation state of Fe in a synthetic martian basalt. Ferric-ferrous ratios were determined on the quenched glasses using Mössbauer spectroscopy. Following the conventional doublet assignments in the spectrum, we obtain a Fe 3+ /ΣFe value of 0.19 at 1450 °C and an oxygen fugacity corresponding to the QFM buffer. If we apply the  Berry et al. (2018)  assignments the calculated Fe 3+ /ΣFe drops to 0.09, and the slope of log( X  Fe   melt   O1.5 / X  Fe   melt O ) vs. log(  f  O2 ) changes from 0.18 to 0.26.

Oxidation state of iron and Fe-Mg partitioning between olivine and basaltic martian melts