Estudio de la Orientación Cristalográfica Preferente del Cuarzo en el Contacto entre Gneises y Metatexitas - Diatexitas del Macizo Cerro Pelado (Sierra de Comechingones, Argentina)

Abstract

The quartz c-axis fabrics measured in the rocks of the high-grade unit of the Cerro Pelado massif (northern Sierra de Comechingones, Sierras Pampeanas, Argentina) allow to deduce a normal-sinistral sense of movement for the south-dipping shear zone separating the diatexite-metatexite domain to the north, from the gneissic terrane to the south. The crystallographic fabrics also indicate that the activity of this shear zone took place under high-T conditions. The deduced kinematics can account for the syn-metamorphic exhumation of the migmatite domain