Comparison of crystallization-remelting scenarios for Earth (a) and Mars (b). Earth properties: initial Fe#=10; core T = 4400 K; g = 9.81 m s⁻²; mantle depth = 2890 km. Mars properties: initial Fe# = 20; core T = 2545 K; g = 3.73 m s⁻²; mantle depth = 1600 km. (c) Initial differentiation stage with melts from the mantle, which are richer in iron than the crystals from the MO. (d) Cross-point situation at which crystals from the MO and melts from the mantle have the same composition. Provided that the fluxes of the crystals and melts are equivalent, the system cannot differentiate further.