Global or regional? Constraining the origins of the middle Bambuí carbon cycle anomaly in Brazil

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorVrije Universiteit Brussel-
Autor(es): dc.contributorET-HOME (Evolution and Tracers of the Habitability of Mars and Earth) Astrobiology Research Consortium-
Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.contributorUniversidade Federal de Minas Gerais (UFMG)-
Autor(es): dc.contributorUniversity of North Carolina-
Autor(es): dc.contributorUS Department of Agriculture-
Autor(es): dc.contributorUniversity of Mons-
Autor(es): dc.contributorSouthwest Petroleum University-
Autor(es): dc.creatorCui, Huan-
Autor(es): dc.creatorWarren, Lucas Veríssimo [UNESP]-
Autor(es): dc.creatorUhlein, Gabriel J.-
Autor(es): dc.creatorOkubo, Juliana [UNESP]-
Autor(es): dc.creatorLiu, Xiao-Ming-
Autor(es): dc.creatorPlummer, Rebecca E.-
Autor(es): dc.creatorBaele, Jean-Marc-
Autor(es): dc.creatorGoderis, Steven-
Autor(es): dc.creatorClaeys, Philippe-
Autor(es): dc.creatorLi, Fei-
Data de aceite: dc.date.accessioned2022-02-22T00:26:54Z-
Data de disponibilização: dc.date.available2022-02-22T00:26:54Z-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2020-09-15-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.precamres.2020.105861-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/199266-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/199266-
Descrição: dc.descriptionThe Ediacaran-Cambrian Bambuí Group in Brazil records an anomalously positive excursion in carbonate carbon isotopes (δ13Ccarb) with a sustained plateau of ca. +15‰ (aka the Middle Bambuí Excursion–MIBE). Considering that the δ13Ccarb signals in Ediacaran-Cambrian seawaters do not typically exceed +6‰, the MIBE therefore represents a profound carbon cycle anomaly in Earth's history. Although intensive studies have been done on the Bambuí Group, origins of the MIBE remain enigmatic. In order to better constrain the biogeochemical carbon and sulfur cycles during the MIBE, high-resolution chemostratigraphic analysis was conducted for both the plateau (i.e., Lagoa do Jacaré Formation) and the recovery part (i.e., lower Serra da Saudade Formation) of the MIBE. Chemostratigraphic profiles reveal remarkably different values in δ13Ccarb, δ13Corg, δ18Ocarb, and δ34Spyrite between these two studied MIBE intervals. The new data show that the plateau of the MIBE is characterized by coupled higher δ13Ccarb, higher δ13Corg, and higher δ34Spyrite signals compared with the recovery part of the MIBE. Based on multiple lines of sedimentological, geochemical, and model evidence, we propose that the possibilities of enhanced organic carbon burial and porewater methanogenesis are insufficient to explain the MIBE. Instead, local or regional controlling factors, including water-column methanogenesis, low-sulfate conditions, and enhanced carbonate recycling in a restricted basin may have played a role, independently or in unison, in generating this profound positive δ13Ccarb excursion. Therefore, the MIBE may reflect a regional event, instead of a global carbon cycle anomaly. We caution against the use of the MIBE in chemostratigraphic correlations on a global scale or any other attempt to infer global carbon cycling at that time. The biogeochemical landscape of the late Ediacaran-Cambrian basins and ocean margins may be more heterogeneous than previously thought.-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionAnalytical Environmental and Geo- Chemistry Group Vrije Universiteit Brussel-
Descrição: dc.descriptionET-HOME (Evolution and Tracers of the Habitability of Mars and Earth) Astrobiology Research Consortium-
Descrição: dc.descriptionDepartment of Geology Institute of Geosciences and Exact Sciences São Paulo State University (Unesp)-
Descrição: dc.descriptionCentro de Pesquisas Manoel Teixeira da Costa Instituto de Geociências Universidade Federal de Minas Gerais, Pampulha-
Descrição: dc.descriptionDepartment of Geological Sciences University of North Carolina-
Descrição: dc.descriptionHydrology and Remote Sensing Laboratory Beltsville Agricultural Research Center US Department of Agriculture-
Descrição: dc.descriptionDepartment of Geology Faculty of Engineering University of Mons-
Descrição: dc.descriptionState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation School of Geoscience and Technology Southwest Petroleum University-
Descrição: dc.descriptionDepartment of Geology Institute of Geosciences and Exact Sciences São Paulo State University (Unesp)-
Descrição: dc.descriptionCNPq: CNPq-486416/2006-2-
Idioma: dc.languageen-
Relação: dc.relationPrecambrian Research-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectBiogeochemistry-
Palavras-chave: dc.subjectCarbon cycle-
Palavras-chave: dc.subjectChemostratigraphy-
Palavras-chave: dc.subjectDiagenesis-
Palavras-chave: dc.subjectEdiacaran-Cambrian transition-
Palavras-chave: dc.subjectGeobiology-
Palavras-chave: dc.subjectMethanogenesis-
Palavras-chave: dc.subjectMiddle Bambuí Excursion (MIBE)-
Palavras-chave: dc.subjectNeoproterozoic-
Palavras-chave: dc.subjectSulfur cycle-
Título: dc.titleGlobal or regional? Constraining the origins of the middle Bambuí carbon cycle anomaly in Brazil-
Tipo de arquivo: dc.typelivro digital-
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