Figure 11. AlVI vs. AlIV diagram for clinopyroxenes from Site 900 flaser gabbros (solid diamonds = porphyroclast core, open diamonds = porphyroclast margin, crosses = neoblast), and from unmetamorphosed lavas and microgabbros from Hole 899B (solid circles). Areas for high, low, and intermediate pressures after Aoki and Shiba (1973), clinopyroxenes from Southwest Indian Ridge (heavy stippling) after Hebert et al. (1991) and Stakes et al. (1991) and from Zabargad Island (horizontal hatching, C = porphyroclast core, N = neoblast) after Bonatti et al. (1987) and Boudier et al. (1988).