Fig. 3: Redox state and ferric iron contents at the surfaces of magma oceans (MOs) of varying depths.
From: A magma ocean origin to divergent redox evolutions of rocky planetary bodies and early atmospheres
The calculated relative redox state a and Fe3+/ΣFe ratio b of MOs of Earth (blue), Mars (red) and the Moon (green) as a function of pressuresat the base of MOs considering a cold thermal profile (Supplementary Note 2). Calculations are performed at the plausible pressure ranges of the bases of the MOs suggested by previous studies34,35,36,44. The redox state/ferric iron content of the present (upper) mantle of Earth (blue), Mars (red) and the Moon (green) are presented as horizontal bars55. The ferric iron contents of the mantle of Mars and the Moon are poorly constrained (not shown) because the available samples suffer from alterations and post-formation oxidations and cannot reflect the ferric iron contents of the source mantle56,57. The 1σ standard deviation is ~0.5 log unit for of the oxygen fugacity and ~0.03–0.06 for the ferric iron content.
