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This contribution aims to characterize the Proterozoic granites of San Ignacio orogeny, western Bolivia, describing their chemical composition, U-Pb and Sm/Nd isotopic to identify sources and process of the crustal formation. The results of chemical and isotopic granitoids of Cachuela, Motacusal and Talcoso, present U/Pb age in zircon between 1307 and 1333 Ma, suggesting an important epoch of generation of granitoids in the Bolivian pre-Cambrian. Chemistry (A-Type granites) and Nd isotopes (eNd(1330) between -0.77 and -3.86) signatures here reported suggest an anorogenic environment and the spider diagram indicate the within-plates tectonic setting for the formation of these granites, instead of arc-related environment is suggested in the literature for these rocks. The data here reported suggest a geological evolution for the Bolivian pre-Cambrian composed of the San Ignacio event is represented by magmatic arc with participation of continental crust previously formed representing an important collisional period in the SW Amazonian craton.

PETROGRAFIA, GEOQUÍMICA E GEOCRONOLOGIA DAS ROCHAS GRANÍTICAS DA OROGENIA SAN IGNÁCIO (BOLÍVIA)