Composition and source of fluids in high-temperature graphite-bearing granitoids associated with granulites: Examples from the Southern Marginal Zone, Limpopo Complex, South Africa

Compositional parameters: XMg = Mg/(Mg + Fe + Mn), XAl = Al/(Si + Al + Ti + Mg + Fe + Mn) (for biotites and orthopyroxenes), XCa = Ca/(Ca + Na + K) (for plagioclase and alkali feldspar), XCa = Ca/(Ca + Mg + Fe + Mn) (for garnet), XK = K/(K + Na + Ca) (for alkali feldspar).403