Fig. 9
P–T diagram for basaltic systems redrawn from Robinson and Bevins (1999) with the suggested PTt path for the BVS. The petrogenetic grid is determined for NCMASH system modified after Liou et al. (1987); see also Frey et al. (1991) 1: Prh + Chl + Lmt = Pmp + Qtz + H2O; 2: Arn + Qtz = Ab + H2O; 3: Lmt + Prh = Cz + Qtz; 4: Prh + Chl + Qtz = Cz + Tr + H2O; 5: Pmp + Qtz = Cz + Prh + Chl + H2O. ZEO zeolite facies, PrA prehnite-actinolite facies, PP prehnite-pumpellyite facies, GS greenschist facies. Partial annealing zone for zircon and apatite as well as the emplacement depth of the Valle del Cervo Pluton are indicated