Fossil-Bearing Concretions of the Araripe Basin Accumulated During Oceanic Anoxic Event 1b

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUNISINOS University-
Autor(es): dc.contributorUniversidade do Vale do Rio dos Sinos-
Autor(es): dc.contributorLeibniz University Hannover-
Autor(es): dc.contributorUniversidade de São Paulo (USP)-
Autor(es): dc.contributorMuseu Itinerante de Ciências Naturais-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorGeozentrum Nordbayern der Friedrich-Alexander-Universität Erlangen-Nürnberg-
Autor(es): dc.contributorCidade Universitária-
Autor(es): dc.contributorUniversity of Brasília-
Autor(es): dc.creatorBom, M. H.H.-
Autor(es): dc.creatorKochhann, K. G.D.-
Autor(es): dc.creatorHeimhofer, U.-
Autor(es): dc.creatorMota, M. A.L.-
Autor(es): dc.creatorGuerra, R. M.-
Autor(es): dc.creatorSimões, M. G.-
Autor(es): dc.creatorKrahl, G.-
Autor(es): dc.creatorMeirelles, V.-
Autor(es): dc.creatorCeolin, D.-
Autor(es): dc.creatorFürsich, F.-
Autor(es): dc.creatorLima, F. H.O.-
Autor(es): dc.creatorFauth, G.-
Autor(es): dc.creatorAssine, M. L.-
Data de aceite: dc.date.accessioned2025-08-21T19:57:07Z-
Data de disponibilização: dc.date.available2025-08-21T19:57:07Z-
Data de envio: dc.date.issued2025-04-29-
Data de envio: dc.date.issued2023-10-31-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1029/2023PA004736-
Fonte completa do material: dc.identifierhttps://hdl.handle.net/11449/307906-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/307906-
Descrição: dc.descriptionFossils from the Araripe Basin (northeastern Brazil) are known for their remarkable preservation of vertebrates and invertebrates, even including soft tissues. They occur in carbonate concretions within organic carbon-rich strata assigned to the Romualdo Formation. Here we present integrated stable isotope, elemental and microfossil records from the Sítio Sobradinho outcrop, Araripe Basin, northeastern Brazil. Our results imply that black shales hosting fossil-bearing carbonate concretions within the lower Romualdo Formation were deposited during Oceanic Anoxic Event (OAE) 1b (Kilian sub-event). Our high-resolution multi-proxy approach allows identifying four phases of environmental evolution. After a pre-event phase, an early phase (onset of the negative carbon isotope excursion—nCIE) of water column stratification and reduced oxygenation likely preconditioned the system for organic carbon burial and preservation. A second phase (peak nCIE) was characterized by an intensified hydrological cycle and continental runoff, as well as increased influx of terrestrial organic matter. High input of continent-derived nutrients might have enhanced biological productivity in the epicontinental sea, ultimately leading to increased organic carbon fluxes and burial, as well as carbonate dissolution at the seafloor. All together, these paleoenvironmental conditions resulted in expansion of an oxygen minimum zone (OMZ), favoring taphonomic processes that led to the excellent preservation of diverse macro- and microfossils. The nCIE recovery phase was characterized by reduced nutrient supply and organic carbon burial. Organic carbon sequestration in such paleoenvironments likely contributed to the recovery (increase) of stable carbon isotope (δ13C) records in the deep ocean during the Kilian sub-event of OAE 1b.-
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.descriptionDeutsche Forschungsgemeinschaft-
Descrição: dc.descriptionitt OCEANEON Technological Institute for Paleoceanography and Climate Changes UNISINOS University-
Descrição: dc.descriptionGeology Graduate Program Universidade do Vale do Rio dos Sinos-
Descrição: dc.descriptionInstitute of Geology Leibniz University Hannover-
Descrição: dc.descriptionInstitute of Geosciences University of Sao Paulo-
Descrição: dc.descriptionMuseu Itinerante de Ciências Naturais-
Descrição: dc.descriptionUNESP – Instituto de Biociências-
Descrição: dc.descriptionFG Paläoumwelt Geozentrum Nordbayern der Friedrich-Alexander-Universität Erlangen-Nürnberg-
Descrição: dc.descriptionPetrobras Research Center (CENPES) Cidade Universitária-
Descrição: dc.descriptionInstitute of Geosciences University of Brasília-
Descrição: dc.descriptionUNESP – Instituto de Biociências-
Descrição: dc.descriptionFAPESP: 2004/15786-0-
Descrição: dc.descriptionFAPESP: 2014/27337-8-
Descrição: dc.descriptionCNPq: 308087/2019-4-
Descrição: dc.descriptionCNPq: 401039/2014-5-
Descrição: dc.descriptionDeutsche Forschungsgemeinschaft: 4467/1-1-
Idioma: dc.languageen-
Relação: dc.relationPaleoceanography and Paleoclimatology-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectAptian-Albian-
Palavras-chave: dc.subjectcarbonate concretions-
Palavras-chave: dc.subjectCretaceous-
Palavras-chave: dc.subjectKilian subevent-
Palavras-chave: dc.subjectRomualdo formation-
Título: dc.titleFossil-Bearing Concretions of the Araripe Basin Accumulated During Oceanic Anoxic Event 1b-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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