P–T pseudosections for sample TKL18-4 in the NCKFMASHTO system, calculated using the following bulk composition (mol%): H₂O = 0.80, SiO₂ = 50.13, Al₂O₃ = 8.49, CaO = 13.12, MgO = 10.90, FeO = 12.37, K₂O = 0.16, Na₂O = 2.31, TiO₂ = 1.12, O = 0.60. (a) P–T pseudosection with the proposed P–T path and isopleths of Ti content in amphibole and X_An in plagioclase for relevant assemblages. The second amphibole out curve (thick dashed curve labelled with Amp) was calculated using an alternative composition with an elevated X_Mg of 0.52 (see the text). (b) Pseudosection presented with isopleths of X_Ca in garnet and Ca^M2 content in clinopyroxene for relevant assemblages. (c) Pseudosection presented with isopleths of X_Mg in garnet, clinopyroxene, orthopyroxene, and amphibole for relevant assemblages. The grey districts represent the P–T conditions of M₁–M₂ generations of mineral assemblages constrained by conventional thermobarometry.