Fig. 2. Pyroxene compositions and evolution of their parental melts of CE-6 basalts.

(A) Mg# versus TiO₂ in pyroxenes. The ranges of Apollo and CE-5 basalts are from (16). (B) Evolution trajectories of CE-6 LT and VLT basalts. Mg# and TiO₂ in the equilibrated melts (pyx-melt) were calculated on the basis of pyroxene compositions (Supplementary Text). The vertical error bars are 1 SD for the average (pyx-melt average). The dashed lines display the evolution trajectories simulated by the PETROLOG program (25) using the bulk compositions of CE-6 LT and VLT basalts. Data of CE-5 basalts and the ilmenite-bearing cumulate (IBC) melts are from (16).