Partial Melting of Aluminous Metagreywackes in the Northern Sierra de Comechingones, Central Argentina |
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| Authors: | OTAMENDI JUAN E; PATINO DOUCE ALBERTO E |
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| Institution: | 1DEPARTAMENTO DE GEOLOGÍA, UNIVERSIDAD NACIONAL DE RÍO CUARTO, 5800 RÍO CUARTO, ARGENTINA
2DEPARTMENT OF GEOLOGY, UNIVERSITY OF GEORGIA, ATHENS, GA 30602, USA |
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| Abstract: | We describe a suite of metamorphic and migmatitic rocks fromthe Sierra de Comechingones (Sierras Pampeanas of Central Argentina)that include unmelted gneisses, migmatites and refractory granulites.The gneisses are aluminous greywackes metamorphosed in the amphibolitegrade and are likely to have been the protoliths for the higher-grademigmatites and granulites. Mineralogical characteristics andmajor and trace element compositions show that metatexite migmatites,diatexite migmatites and granulites are all melt-depleted rocks.The migmatites (both metatexites and diatexites) have undergoneH2O-fluxed melting and lost |
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