Figure 8. Basalt clasts plotted on an AFM diagram fall off the M (MgO) end of the Skaergaard magma evolution trend in a region typically characterized by cumulate rocks. Also plotted for comparison are a calculated primitive abyssal basalt (PAB) from Dick (1989), an average Atlantic abyssal basalt (AAB) from Melson et al. (1976), and an average N-MORB (N MORB) from Humphris et al. (1985).