The transgressive-regressive cycle of the Romualdo Formation (Araripe Basin): Sedimentary archive of the Early Cretaceous marine ingression in the interior of Northeast Brazil

Autor(es)

Custodio, Michele Andriolli ^[1] ; Quaglio, Fernanda ^[2] ; Warren, Lucas Verissimo ^[1] ; Simoes, Marcello Guimaraes ^[3] ; Fuersich, Franz Theodor ^[4] ; Perinotto, Jose Alexandre J. ^[1] ; Assine, Mario Luis ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, UNESP, Inst Geociencias & Ciencias Exatas, Ave 24A, 1515, BR-13506900 Rio Claro - Brazil

^[2] Univ Fed Uberlandia, Inst Geog, Curso Geol, Rodovia LMG 746, Km 1, BR-38500000 Monte Carmelo, MG - Brazil

^[3] Univ Estadual Paulista, UNESP, Inst Biociencias, Dept Zool, BR-18618000 Botucatu, SP - Brazil

^[4] Friedrich Alexander Univ Erlangen Numberg, GeoZentrum Nordbayern, FG Palaoumwelt, Loewenichstr 28, D-91054 Erlangen - Germany

• Tipo de documento: Artigo Científico
• Fonte: SEDIMENTARY GEOLOGY; v. 359, p. 1-15, AUG 15 2017.
• Citações Web of Science: 11

Resumo

Geologic events related to the opening of the South Atlantic Ocean deeply influenced the sedimentary record of the Araripe Basin. As consequence, upper stratigraphic units of the basin record a marine ingression in northeastern Brazil during the late Aptian. The timing and stratigraphic architecture of these units are crucial to understand the paleogeography of Gondwana and how the proto-Atlantic Ocean reached interior NE Brazil during the early Cretaceous. This marine ingression is recorded in the Araripe Basin as the Romualdo Formation, characterized by a transgressive-regressive cycle bounded by two regional unconformities. In the eastern part of the basin, the Romualdo depositional sequence comprises coastal alluvial and tide-dominated deposits followed by marine transgressive facies characterized by two fossil-rich intervals: a lower interval of black shales with fossil-rich carbonate concretions (Konservat-Lagerstatten) and an upper level with mollusk-dominated shell beds and shelly limestones. Following the marine ingression, an incomplete regressive succession of marginal marine facies records the return of continental environments to the basin. The stratigraphic framework based on the correlation of several sections defines a transgressive-regressive cycle with depositional dip towards southeast, decreasing in thickness towards northwest, and with source areas located at the northern side of the basin. The facies-cycle wedge-geometry, together with paleocurrent data, indicates a coastal onlap towards NNW. Therefore, contrary to several paleogeographic scenarios previously proposed, the marine ingression would have reached the western parts of the Araripe Basin from the SSE. (C) 2017 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 14/00519-9 - Centralidades do lazer noturno na cidade de São Carlos-SP e as relações de interface
• Beneficiário: Tiago Ferreira Lopes Machado
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 04/15786-0 - Reavaliacao da geologia da bacia do araripe, nordeste do brasil.
• Beneficiário: Mario Luis Assine
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 14/27337-8 - Tafonomia das coquinas da Bacia do Araripe e a ingressão marinha cretácea no interior do Nordeste do Brasil
• Beneficiário: Fernanda Quaglio
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado