Petrología y análisis geométrico y tectónico de las milonitas de la Sierra de Copacabaña, provincia de Catamarca, República Argentina
DOI:
https://doi.org/10.3989/egeol.92485-6400Keywords:
Sierras Pampeanas, Famatina Range, Lower Paleozoic, Cataclasite rocks, Petrography, GeotectonicAbstract
A petrographic and structural study of units from Copacabana Range in the Northwestern Pampean Ranges is presented. Two facies of deformed granitoids were recognized. Rocks of both facies are classificated as mylonite schists, mylonite gneisses and protomylonites. First would have formed at temperature of 3500 C and 15 km of deep. Protomylonite would have formed at lower temperatures and deeps. Undeformed granitoids and ortogneis are also descript.
Structural data and the analysis of some kinematic indicators suggest that a main shear plane strikes NNW, inclined to the east, with vergence to the west. Geometric analysis, realized in base to petrographic diagrams of c-axis of quartz and mica cleavage suggest an orthorhombic fabric.
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