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The period of earth history which includes Proterozoic and late Archean time (roughly 1.0-2.7 billion years ago) was punctuated by metamorphism at high temperature (700°-900° C) and high pressures (8 ± 2 kbar for many terrains) in a thick continental crust. Most of the known charnockites (quartzofeldspathic orthopyroxene-bearing granulites) were formed in this period. Archean charnockites were most commonly produced by metamorphism of amphibole-bearing “gray” gneisses whose precursors probably were, in many cases, calc-alkaline plutonic suites. Charnockites showing relic igneous textures are more characteristic of the later Proterozoic than of earlier time. Many large Proterozoic charnockite bodies had plutonic precursors...

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