Stratigraphy of the western edge of the São Francisco Basin

Authors

  • Carlos José Souza de Alvarenga Universidade de Brasília
  • Marcel Auguste Dardenne in memorian
  • Lucieth Cruz Vieira Universidade de Brasília
  • Caroline Thaís Martinho Universidade de Brasília
  • Edi Mendes Guimarães Universidade de Brasília
  • Roberto Ventura Santos Universidade de Brasília
  • Rafael Oliveira Santana Universidade de Brasília

Keywords:

Bambuí Group, Paranoá Group, MesoNeoproterozoic, Carbon Isotope, Sr Isotope

Abstract

The western edge of the São Francisco Basin consists of a succession of siliciclastic and carbonate rocks deposited during the Mesoproterozoic and the Neoproterozoic. This basin during the Brasiliano Orogeny was tectonically segmented into compartments without deformation and those with different intensity of deformation. The São Domingos Fault exposed more than 2.000m of the Paranoá and São Francisco megasequences that were studied in this paper. A stratigraphic complexity occurs at the boundary
between these two megasequences with partial and total loss of stratigraphy sequence. C, O and Sr isotopes were applied to carbonates rocks of these two megasequences as an important tool to separate stratigraphic sequence. Abrupt changes of d13C values mark the boundary between two sequences of the Bambuí Group and 87Sr/86Sr ratio show different values for the Paranoá and São Francisco megasequences.

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Published

2012-11-01

Issue

Vol. 20 No. 1-2 (2012)

Section

Articles

How to Cite

ALVARENGA , Carlos José Souza de; DARDENNE , Marcel Auguste; VIEIRA , Lucieth Cruz; MARTINHO , Caroline Thaís; GUIMARÃES , Edi Mendes; SANTOS , Roberto Ventura; SANTANA, Rafael Oliveira. Stratigraphy of the western edge of the São Francisco Basin. Boletim de Geociências da Petrobras, Rio de Janeiro, v. 20, n. 1-2, p. 145–164, 2012. Disponível em: https://bgp.petrobras.com.br/bgp/article/view/96. Acesso em: 20 sep. 2024.