Figure 9. Thermobarometric estimates using Grt-Bt thermometry coupled with Grt-Crd-Sil-Qtz barometry in high-grade gneisses. 1 = Grt cores and inner rims and matrix Bt. 2 = Grt cores and inner rims and Crd. The stippled area represents likely metamorphic conditions for the M3 metamorphism in the high-grade gneisses. The Keq lines have been obtained using Sample 161-976B-97R-2 (Piece 18, 111-114 cm). Bt + Als = Grt + Crd (KFMASH system) after Spear (1993). The other reaction curves as in Figure 8.

Figure 9. Thermobarometric estimates using Grt-Bt thermometry coupled with Grt-Crd-Sil-Qtz barometry in high-grade gneisses. 1 = Grt cores and inner rims and matrix Bt. 2 = Grt cores and inner rims and Crd. The stippled area represents likely metamorphic conditions for the M₃ metamorphism in the high-grade gneisses. The K_eq lines have been obtained using Sample 161-976B-97R-2 (Piece 18, 111-114 cm). Bt + Als = Grt + Crd (KFMASH system) after Spear (1993). The other reaction curves as in Figure 8.