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Early Aptian marine incursions in the interior of northeastern Brazil following the Gondwana breakup

2023; Nature Portfolio; Volume: 13; Issue: 1 Linguagem: Inglês

10.1038/s41598-023-32967-w

2045-2322

Gerson Fauth, Henrique Parisi Kern, Jorge Villegas‐Martín, Marcelo A. De Lira Mota, Marcos Antonio Batista dos Santos Filho, Amanda Santa Catharina, Lilian Maia Leandro, Fernanda Luft-Souza, Oscar Strohschoen, Andressa Nauter-Alves, Edna de Jesus Francisco Tungo, Mauro Daniel Rodrigues Bruno, Daiane Ceolín, Simone Baecker‐Fauth, Marlone H.H. Bom, Francisco Henrique de Oliveira Lima, Alessandra Santos, Mário Luís Assine,

Geology and Paleoclimatology Research

This study reports a set of primeval marine incursions identified in two drill cores, 1PS-06-CE, and 1PS-10-CE, which recovered the Barbalha Formation, Araripe Basin, Brazil. Based on a multi-proxy approach involving stratigraphy, microbiofacies, ichnofossils, and microfossils, three short-lived marine incursions were identified, designated Araripe Marine Incursions (AMI) 1-3. AMI-1 and AMI-2, which occur within the shales of the Batateira Beds (lower part of the Barbalha Formation), were identified by the occurrence of benthonic foraminifera, calcareous nannofossils, dinocysts, and a mass mortality event of non-marine ostracods. AMI-3 was recognized in the upper part of the Barbalha Formation, based on the occurrence of ichnofossils and planktonic foraminifera. The observation of the planktonic foraminifera genus Leupoldina for the first time in the basin indicates early Aptian/early late Aptian age for these deposits, and the first opportunity of correlation with global foraminifera biozonation. Our findings have implications for the breakup of the Gondwana Supercontinent, as these incursions represent the earliest marine-derived flooding events in the inland basins of northeastern Brazil.