High-resolution taphonomy and sequence stratigraphy of internally complex, bakevelliid-dominated coquinas from the Aptian Romualdo Formation, Araripe Basin, NE Brazil

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Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorUniv Fed Ouro Preto-
Autor(es): dc.contributorFriedrich Alexander Univ Erlangen Nurnberg-
Autor(es): dc.creatorRodrigues, M. G.-
Autor(es): dc.creatorVarejao, F. G.-
Autor(es): dc.creatorMatos, S. A.-
Autor(es): dc.creatorFuersich, F. T.-
Autor(es): dc.creatorWarren, L. V.-
Autor(es): dc.creatorAssine, M. L.-
Autor(es): dc.creatorSimoes, M. G.-
Data de aceite: dc.date.accessioned2025-08-21T23:47:50Z-
Data de disponibilização: dc.date.available2025-08-21T23:47:50Z-
Data de envio: dc.date.issued2022-11-29-
Data de envio: dc.date.issued2022-11-29-
Data de envio: dc.date.issued2022-09-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.marpetgeo.2022.105814-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/237799-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/237799-
Descrição: dc.descriptionThe Aptian Romualdo Formation (Araripe Basin, NE Brazil) was deposited in a restricted epeiric sea, during the opening of the South Atlantic Ocean, with a coeval record to that in the Brazilian Pre-Salt succession. The upper part of the Romualdo Formation encompasses the Highstand Systems Tract of a third-order stratigraphic sequence, and contains shell beds interbedded with shale, siltstone, and fine-grained sandstone. Based on distinct taphonomic features (shell sorting, fragmentation, abrasion, rounding, and orientation), sedimentological criteria (shell abundance, type of matrix, sedimentary structures, and presence/absence of quartz grains), and stratigraphic attributes (bed thickness, geometry, contacts), the paleoenvironmental conditions and the bed-bybed accumulation history of the coquinas is disentangled. Eight carbonate microfacies were recognized, including ostracod carbonate mudstone, bivalve-gastropod wackestone, gastropod-bivalve packstone, bivalvegastropod grainstone, bivalve-gastropod floatstone, bivalve-gastropod rudstone, bakevelliid floatstone, and bakevelliid rudstone, which are organized in six, cm-thick shell concentrations. Mudstone and wackestone facies mark the settling of carbonate muds without significant bottom currents and wave action, probably below storm wave base, whereas packstone, floatstone, and rudstone, with fragmented, rounded, and oriented shells, were deposited in agitated waters, between the fair-weather and the storm wave bases. Ripple cross-laminated grainstone is interpreted as high-energy facies deposited above fair-weather wave base. The shell beds are internally complex and consist of cm-scale alternations of microfacies differing in packing, sorting, and composition. They tend to fine upwards within dm-thick shell beds, generating shallowing-upward facies sequences. The concentrations, the uppermost one with in situ bakevelliid shells in the top, record high-frequency base level oscillations influenced by eustasy and climate changes. These bioclastic accumulations originated by the superposition of sedimentologic and primary biologic processes (e.g., post-deposition meiofaunal bioturbation). The cm-thick, low-diversity shell beds are excellent examples of multiple-event carbonate deposits generated in a siliciclastic-dominated, restricted epeiric sea, revealing high-frequency cycles in proximal to distal restricted marine settings.-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionPetrobras-
Descrição: dc.descriptionCenter for Geosciences Applied to Petroleum Geology -UNESPetro, IGCE/Unesp/Rio Claro-
Descrição: dc.descriptionP,D&I Clause of ANP Resolution-
Descrição: dc.descriptionUniv Estadual Paulista, Dept Geol, Inst Geociencias & Ciencias Exatas, Ave 24A 1515, BR-12506900 Rio Claro, Brazil-
Descrição: dc.descriptionUniv Estadual Paulista, Setor Zool, Inst Biociencias, Dist Rubiao Junior, BR-18618000 Botucatu, Brazil-
Descrição: dc.descriptionUniv Fed Ouro Preto, Dept Geol, Escola Minas, Morro Cruzeiro, BR-35400000 Ouro Preto, MG, Brazil-
Descrição: dc.descriptionFriedrich Alexander Univ Erlangen Nurnberg, Geozentrum Nordbayern, FG Palaoumwelt, Loewenichstr 28, D-91054 Erlangen, Germany-
Descrição: dc.descriptionUniv Estadual Paulista, Dept Geol, Inst Geociencias & Ciencias Exatas, Ave 24A 1515, BR-12506900 Rio Claro, Brazil-
Descrição: dc.descriptionUniv Estadual Paulista, Setor Zool, Inst Biociencias, Dist Rubiao Junior, BR-18618000 Botucatu, Brazil-
Descrição: dc.descriptionFAPESP: 18/01750-7-
Descrição: dc.descriptionFAPESP: 16/13214-7-
Descrição: dc.descriptionFAPESP: 17/20803-1-
Descrição: dc.descriptionCNPq: 401039/2014-5-
Descrição: dc.descriptionCNPq: 304800/2017-1-
Descrição: dc.descriptionPetrobras: 2014/00519-9-
Descrição: dc.descriptionP,D&I Clause of ANP Resolution: 50/2015-
Formato: dc.format22-
Idioma: dc.languageen-
Publicador: dc.publisherElsevier B.V.-
Relação: dc.relationMarine And Petroleum Geology-
???dc.source???: dc.sourceWeb of Science-
Palavras-chave: dc.subjectEpeiric sea coquinas-
Palavras-chave: dc.subjectMulti-event shell beds-
Palavras-chave: dc.subjectHigh-resolution sequence stratigraphy-
Palavras-chave: dc.subjectLower cretaceous-
Título: dc.titleHigh-resolution taphonomy and sequence stratigraphy of internally complex, bakevelliid-dominated coquinas from the Aptian Romualdo Formation, Araripe Basin, NE Brazil-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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