Pressure − Temperature phase diagram constructed for the sample AR14 and contoured with compositional and modal isopleths. Bulk composition used is available in Table 3. (A) P–T mineral assemblage diagram with main reaction curve highlighted. M_b, M_c and M_d mineral assemblage stability fields are in bold. (B) Si apfu isopleths of muscovite and Ti-in-Bt thermometry results. (C and D) Xalm, Xgrs, Xprp and Xsps isopleths of garnet. Dotted arrow represents the rough path inferred from garnet compositions in Tables 1 and 2.