Graphical analysis of P—T—X relations in granulite facies metapelites

Abstract

The study of the complex mineral reactions in metamorphic rocks is facilitated by graphical representation in the form of chemographic projections and phase diagrams. In this chapter we discuss and develop the graphical analysis of phase relations in multicomponent systems containing Fe-Mg solid solutions. Particular emphasis is placed on the relevance of divariant and univariant equilibria for the interpretation of mineral reactions in high-grade metapelites.