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1 Introduction Metamorphosed mafic rocks in orogenic belts usually involve high-variance assemblages which are stable very large regions of pressure(P)–temperature(T)and compositional(X)space.In particular,amphibolite facies mafic rocks typically contain similar assemblages:
1 Introduction Metamorphosed mafic rocks in orogenic belts usually involve high-variance assemblages which are stable very large regions of pressure (P) -temperature (T) and compositional (X) space. In particular, amphibolite facies mafic rocks contain similar assemblages: