Fig. 1: Molar volume difference (ΔV) between FeO1.5 and FeO in silicate melts.
From: A magma ocean origin to divergent redox evolutions of rocky planetary bodies and early atmospheres
The calculated ΔV is shown as a function of pressure at different temperatures: a 12.5 mol% iron for Earth- and Moon-like magma ocean and b 25 mol% iron for Mars-like magma ocean. Insets show the corresponding pressure–volume relationships for melts containing 12.5 and 25 mol% iron as Fe2+ (solid symbols and curves) and Fe3+ (open symbols and dashed curves). Volumes are plotted along isotherms only to pressures where the simulated systems were in a liquid state. The 1σ standard deviation of ΔV is ~0.2–0.5 cm3 mol−1.
