Tectono-depositional correlation between the Brazilian continental margin and the Rio Grande Rise
DOI:
https://doi.org/10.11606/issn.2316-9095.v20-165500Keywords:
Rio Grande Rise, Brazilian continental margin, Sediment package, VolcanismAbstract
The Brazilian continental margin was formed by the opening process of the South Atlantic with the rupture of the West Gondwana and the separation between South America and Africa in the Lower Cretaceous. In turn, the Rio Grande Rise (RGR) would have been originated by hot spots along the oceanic portion of the moving South American plate. Alternatively, the RGR would be part of the continental crust, which would have been submerged after detaching from the continent, or even a combination of a volcanic province with a microcontinent. We propose to make a tectono-depositional correlation between the RGR and the adjacent Brazilian continental margin, within the context of South Atlantic evolution. From the interpretation of seismic profiles and stratigraphic borehole data, it was possible to identify similarities between the seismic facies in the volcano-sedimentary sequence in the RGR and the most distal Brazilian continental margin, as well as correlation in terms of chronostratigraphic development of the two regions. These similarities in the sedimentary package include the volcanic event in the Eocene and the extensional tectonics in the Paleogen and Neogen to show a common tectono-depositional evolution in both the RGR and the adjacent continental margin.
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Copyright (c) 2020 Adriane Gomes Pinheiro Praxedes, David Lopes de Castro
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