Figure 6. Normative projections of the olivine (ol), plagioclase (pl), diopside (di), quartz (q) basalt tetrahedron on the triangular diagrams (A) ol-pl-q and (B) ol-di-q. Shown are liquids multiply-saturated in olivine, plagioclase, and pyroxene together with coexisting pyroxenes. The normative components have been calculated using a CIPW molecular norm with iron distributed as for Figure 2. The pyroxenes have been plotted assuming that all iron occurs as FeO. The vertical lines marked 108R1 and 10R7 (stippled) and 27R2 (full drawn) are schematic illustration of pigeonite saturation (marked by `+') for the three melted sections, respectively 152-918D-108R-1, 163-989B-10R-7, and 152-917A-27R-4. Section 152-917A-86R-7 is not saturated in pigeonite at any temperature melted. The low-Ca pyroxene saturated liquids marked by `|' are from Juster et al. (1989) and Grove and Juster (1989) and range in composition from basaltic to andesitic. Other abbreviations used are hy = hypersthene, pig = pigeonite, and aug = augite.