Sergipe-Alagoas Basin, Northeast Brazil: A reference basin for studies on the early history of the South Atlantic Ocean.

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From: Earth-Science Reviews(Vol. 229)
Publisher: Elsevier Science Publishers
Document Type: Report
Length: 447 words

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Keywords: Late Barremian--Albian interval; Biostratigraphy; Paleobiogeography; Paleoenvironmental evolution; Marine incursions Highlights * Sergipe-Alagoas Basin presents an Early Cretaceous complete marine succession. * Biostratigraphic and paleobiogeographic review about ammonites and microfossils. * Paleoenvironmental evolution since marine incursions to open marine. * Paleoceanographic stages of the early South Atlantic Ocean were presented. * Correlation between the stages with global scale paleoceanographic events. Abstract Early Cretaceous sedimentary basins on the South Atlantic continental margins of South America and Africa are closely related with the Gondwana break-up, and record coeval paleoceanographic, paleoclimatic, and biotic changes during the late Barremian--Albian. The Sergipe-Alagoas Basin of northeastern Brazil contains one of the most complete Lower Cretaceous stratigraphic successions of the South Atlantic Ocean, including sedimentary and paleontological records nearly absent in nearby basins on the African/Brazilian continental margins. Fossil-rich sedimentary successions from the Sergipe-Alagoas Basin have allowed to assess: (i) evolutionary stages of the early South Atlantic Ocean; (ii) paleobiogeography of marine incursions (Austral and/or North Atlantic/Tethyan influences); and (iii) local signatures of global-scale paleoceanographic, paleoclimatic, and biotic events. Here we provide an overview on fossil-based biostratigraphic and paleoenvironmental studies of the Sergipe-Alagoas Basin, from the first marine incursions in a continental setting, to fully open-marine conditions. Based on eight fossil groups (ammonites, calcareous nannofossils, echinoids, planktonic and benthonic foraminifera, ostracods, palynomorphs, and radiolarians) from 107 sites, we observed that the marine biota shows strong affinity with Tethyan Realm in the Aptian--Albian interval, and provincialism/endemism is likely tied to the early-stage development of the South Atlantic Ocean. Based on late Barremian--late Albian lithological, paleontological, and geochemical data, we suggest three Sergipe-Alagoas Paleoenvironmental Stages (SAPSs): (i) continental conditions with possible episodic marine incursions (SAPS-1); (ii) transitional system, from continental to restricted-marine conditions (SAPS-2); (iii) transition from restricted- to open-marine conditions (SAPS-3). These local-scale evolutionary stages are correlated with early phases of the South Atlantic Ocean and major late Early Cretaceous paleoceanographic and paleoclimatic events. Moreover, we provide new approaches on the response of low-latitude biota to changing ocean circulation patterns in a hot, ice-free "greenhouse" world. Author Affiliation: (a) Post-Graduate Program in Geology, Unisinos University, São Leopoldo, RS, Brazil (b) itt Oceaneon -- Technological Institute of Paleoceanography and Climate Change, Unisinos University, São Leopoldo, RS, Brazil (c) Terra Carbonates, Porto Alegre, RS, Brazil * Corresponding author at: itt Oceaneon -- Technological Institute of Paleoceanography and Climate Change, Unisinos University, Av. Unisinos, 950 - Cristo Rei, São Leopoldo - RS 93022-750, Brazil. Article History: Received 10 November 2021; Revised 25 February 2022; Accepted 18 April 2022 Byline: Fernanda Luft-Souza [felufts@gmail.com] (a,b,*), Gerson Fauth (a,b), Mauro D.R. Bruno (a,b), Marcelo A. De Lira Mota (b), Bernardo Vázquez-García (a,b), Marcos A.B. Santos Filho (b), Gerson J.S. Terra (c)

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Gale Document Number: GALE|A703357071