Pressure − Temperature phase diagram constructed for the sample AR736 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 and C) X_alm, X_grs, X_prp and X_sps isopleths of garnet. Dotted arrow represents the rough path inferred from garnet compositions in Tables 1 and 2. (D) Zr-in-Rt thermometry results. Each red line represents a Zr-in-Rt analysis, the red area represents the temperature calculated from the sixteenth data with the highest Zr content. (E) Si apfu isopleths of muscovite and modal proportion of biotite expressed as vol%. (F) X_Mg compositional and modal isopleths for staurolite.