Chemical, petrological and mass balance constraints on the textural evolution of pelitic enclaves

An important message is that textural analysis in xenoliths, and probably also in other rock types, must be complemented by chemical (compositions and reaction balance) and petrological (coherent P-T projections or pseudosections) constraints to distinguish between alternative generic possibilities. This method sheds new light on a discussion on the melt volume produced during biotite dehydration melting in migmatites.