Journal
EARTH-SCIENCE REVIEWS
Volume 229, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.earscirev.2022.104034
Keywords
Late Barremian-Albian interval; Biostratigraphy; Paleobiogeography; Paleoenvironmental evolution; Marine incursions
Categories
Funding
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior-Brasil (CAPES) [IODP/CAPES 88887.091703/2014-01]
- Shell Brazil
- BG Brazil Brazil-ANP [18993-6]
- CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico, Brazil) [308087/2019-4]
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The fossil-rich sedimentary successions in the Sergipe-Alagoas Basin provide valuable insights into the early stages of the South Atlantic Ocean development and major paleoceanographic events during the late Early Cretaceous.
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. Fossilrich 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 restrictedmarine conditions (SAPS-2); (iii) transition from restricted- to open-marine conditions (SAPS-3). These localscale 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.
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