High pressures may have enabled ferric iron-rich silicate melts to coexist with iron metal near the base of magma oceans early in the history of large rocky planets like Earth. This suggests a relatively oxygen-rich atmosphere during the late stages of core formation on these planets.
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Gaillard, F. Oxygen-rich melt in deep magma oceans. Nat. Geosci. 16, 392–393 (2023). https://doi.org/10.1038/s41561-023-01178-3
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DOI: https://doi.org/10.1038/s41561-023-01178-3
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