Abstract
The Rio Chico Complex, which includes the Cushamen Metamorphics and the Mamil Choique Granitoids (Ordovician, 439±10 Ma), constitutes the crystalline basement of the Rio Chicoregion (southwestern North Patagonian massif). The metamorphics and migmatites resulted from a medium to high grade tectono-thermal event which caused local antexis of a protolith of graywackes, pelites and some quartz-rich sandstones. These rocks show a main deformational episode, trending mainly NNW, which controlled the post-Paleozoic structures. A Devonian age granite (387±17 Ma) intruded this complex. The Ordovician and Devonian granitoids, which are calc-alkaline, and per to metaluminous, may be related to anatexis during the Taconian and Acadian Laurentia-Gondwana collisional events. During the Permian (260±5 Ma) leucogranites, some bearing garnet, were intruded into the ancient orogenic belt following an important phase uplift. They are related to further melting of continental crust during extension in an intraplate environment, and are included in the Choiyoi acidic Province.
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