Figure 4 –

Olivine fractionation model for Apollo 12 olivine- and pigeonite normative mare basalts. Sample data (gray dashed lines) are compared with fractionation of olivine (Fo₇₃) in equilibrium with a primitive magma composition in one percent increments using crystal-liquid partition coefficients for MgO-rich volcanic rocks from the terrestrial literature (red dashed lines; kD_Os = ~1.3; kD_Ir = ~0.7; kD_Ru = ~1.7; kD_Pt = ~0.08; kD_Pd = ~0.03; kD_Re = ~0.1; Day, 2013) and iteratively calculated best-fit crystal-liquid partition coefficients (black lines; kD_Os = 2.2; kD_Ir = 2.4; kD_Ru = 2; kD_Pt = 2.1; kD_Pd = 2.1; kD_Re = 1.5). In contrast to terrestrial magmas, the HSE appear to be strongly compatible in lunar igneous environments. CI-chondrite normalization data from Horan et al. (2003).