Figure 2. Al^IV vs. K + Na diagram for calcic amphiboles. High- and low-temperature amphiboles from flaser gabbros and amphibolites of Sites 899 and 900 are reported for comparison (Cornen et al., chapter 26, this volume). Solid squares correspond to kaersutite from Sample 149-897D-14R-4, 95-100 cm. Amphibole data from serpentinized peridotites of Hole 637A (Leg 103) from Agrinier et al. (1988).