Redox gradients in planetary systems with terrestrial planet formation simulations

There appears to be a bulk planetary redox (mantle FeO/core mass fraction (CMF)) gradient in the Solar System, going from a more reduced, metal-rich inner system, to more oxidized and hydrated outer solar system. Mercury’s high CMF and Mars’ high mantle FeO content and small CMF are consistent with an intrinsic redox gradient that persists from disk to planet in the Solar System. Models of metal-silicate equilibration during core formation have adopted redox gradients within the disk (metal rich at < 0.5 AU, water and FeO-rich outside of 1 AU) to help explain e.g. the trace element distribution between mantle and core in the Earth and Mars, as well as bulk mantle FeO and CMF. Using similar initial distributions, I will develop a model of metal-silicate equilibration that includes the Fe disproportionation reaction to examine the distribution of both bulk redox states and mantle redox states at the end of…