Fig. 5
Predicted \({\mathrm{K}}_{\mathrm{D},\mathrm{Fe}^{2+}-\mathrm{Mg}}^{\mathrm{ol}/\mathrm{liq}}\) using Model 1 (function of T, \({\mathrm{X}}_{\mathrm{Si}}^{\mathrm{liq}}\), and olivine composition) vs. the experimentally measured values for A the RKD experiments (n = 14), symbols are the same as in Fig. 1, and B for a subset of the low-ƒO2 literature (Lit.) experiments with liquids that contained ≤ 1.45 wt% Na2O + K2O and ≤ 2.14 wt% TiO2 (n = 82) plus the RKD experiments (n = 14). Alkali and TiO2 bounds are based on the maximum Na2O + K2O and TiO2 contents in the RKD glasses. Gray circles – chondrites; gray triangles (right facing) – eucrites; blue diamonds – lunar; white diamonds – lunar high-Ti; red triangles (down-facing) – Martian; maroon stars – terrestrial; green triangles (left-facing) – ureilites; yellow triangles (down-facing) – RKD experiments shown in panel A. Fe3+/Fe2+ in the glasses was calculated using Borisov et al. (2018) at the T and ƒO2 of each experiment; a.a.d. is the average absolute deviation in measured \({\mathrm{K}}_{\mathrm{D},\mathrm{Fe}^{2+}-\mathrm{Mg}}^{\mathrm{ol}/\mathrm{liq}}\) – predicted \({\mathrm{K}}_{\mathrm{D},\mathrm{Fe}^{2+}-\mathrm{Mg}}^{\mathrm{ol}/\mathrm{liq}}\); in panel B, a.a.d. reflects only the literature data. The black diagonal line in each panel is a 1:1 line. Error bars are 1σ. Best-fit parameters for Model 1 are listed in Table 4