Structural evolution of the Sierra de Juárez mylonitic complex, State of Oaxaca, Mexico

Abstract

The western side of Sierra de Juárez, State of Oaxaca, Mexico, is characterized by a N-S trending structural complex more than 130 km long and 10 to 15 km wide, constituting a mylonitic belt that is the largest in Mexico. In the southern part of this belt, the mylonite protolith is formed by: (1) gneiss, granulite, anorthosite, and marble from the basement of the Zapoteco terrane (Oaxacan Complex); (2) leucocratic granitic rocks consisting in the mylonitized granite near San Pablo and San Pedro Etla, which is correlated with the Permian "Etla Granite", and the granite close to San Felipe del Agua, near the city of Oaxaca, which is considered syntectonic; (3) ultramafic basement units of the Cuicateco terrane, such as hornblendite and gabbro; (4) basic volcanic or subvolcanic rocks; and (5) sedimentary rocks of unknown origin... In order to continue, download full text in PDF.