Fig. 2

Compatibility of S and FeO content of Mercury’s mantle with pressure of metal/silicate equilibration for various core S contents (1, 2, 5, and 7 wt%). Label on each panel gives the core metal S content at C saturation conditions (see text). Lines are contours of the pressure (GPa) of metal/silicate equilibrium. Colored box depicts limits on S and FeO in silicate discussed in text (see Table 3 for compositions). Lines of constant FeO content across box indicate estimates of Mercury compositions from two sources: Nittler et al. (2018) mantle composition (0.04 wt%) and Namur et al. (2016) (ΔIW = − 5.4). Equivalent oxygen fugacity in log units relative to the iron-wüstite buffer on right assuming 70 wt% Fe in metal. Hatched regions flag pressures outside Mercury’s 2/7 ≤ P/P_CMB ≤ 2/3 limits. Liquid immiscibility in Fe-Si-S (Morard and Katsura 2010) potentially affects only the lowest pressures at \(X^{\text {met}}_{\mathrm {S}}\) = 2, but does not substantially affect the results