Petrografia, geoquímica e geocronologia das rochas graníticas da orogenia san ignácio (Bolívia)

Translated title of the contribution: Geology, geochemistry and geocronology of the granitic rocks of san ignÁcio orogeny (BolÍvia)

Gabriela Vargas-Mattos, Mauro César Geraldes, Armando D. Tavares, Ramiro Matos Salinas, Wilson Teixeira

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

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 (εNd(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.

Translated title of the contributionGeology, geochemistry and geocronology of the granitic rocks of san ignÁcio orogeny (BolÍvia)
Original languagePortuguese
Pages (from-to)1-18
Number of pages18
JournalGeociencias
Volume39
Issue number1
DOIs
StatePublished - 2020

Bibliographical note

Publisher Copyright:
© 2020, Universidade Estadual Paulista(UNESP). All rights reserved.

Keywords

  • Amazonian craton
  • Bolivian pre-Cambrian
  • Proterozoic
  • San Ignacio Orogeny

Fingerprint

Dive into the research topics of 'Geology, geochemistry and geocronology of the granitic rocks of san ignÁcio orogeny (BolÍvia)'. Together they form a unique fingerprint.

Cite this