Sequence stratigraphy and chemostratigraphy of an Ediacaran-Cambrian foreland-related carbonate ramp (Bambuí Group, Brazil).

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dc.contributor.authorCaetano Filho, Sergio
dc.contributor.authorSantos, Gustavo Macedo de Paula
dc.contributor.authorGuacaneme, Cristian
dc.contributor.authorBabinski, Marly
dc.contributor.authorBedoya Rueda, Carolina
dc.contributor.authorPeloso, Marília
dc.contributor.authorAmorim, Kamilla Borges
dc.contributor.authorAfonso, Jhon Willy Lopes
dc.contributor.authorAmaral, Matheus Henrique Kuchenbecker do
dc.contributor.authorReis, Humberto Luis Siqueira
dc.contributor.authorTrindade, Ricardo Ivan Ferreira da
dc.date.accessioned2020-04-15T15:23:30Z
dc.date.available2020-04-15T15:23:30Z
dc.date.issued2019
dc.description.abstractIn the terminal Neoproterozoic, drastic climate changes associated with biological innovations are coupled to isotope and elemental geochemical anomalies. However, lateral variability and local depositional controls may affect global geochemical signals, which can only be tracked through a proper stratigraphic/paleogeographic assessment. Here, we investigate the sequence stratigraphy and chemostratigraphy of the basal units of the Bambuí Group, central-east Brazil. This stratigraphic unit records a foreland basin system developed during the Ediacaran-Cambrian West Gondwana assembly and represents a 1st-order sequence, in which the two lowermost 2nd-order sequences record major geochemical disturbances. The first 2nd-order sequence started with the deposition of a transgresive systems tract, possibly in a postglacial scenario, which accompanies a negative-topositive δ13Ccarb excursion. The early highstand systems tract represents the establishment of a marine carbonate ramp throughout the basin. In terms of chemostratigraphy, it corresponds to a δ13Ccarb plateau close to 0‰ and Sr/Ca ratios around 0.001. The late highstand stage coincides with a remarkable increase in Sr content and Sr/Ca ratios at basinal scale. Occurrences of the Cloudina sp. late Ediacaran index fossil were reported in this stage. An erosional unconformity associated with a dolomitic interval, locally including subaerial exposure features, marks the top of the first 2nd-order sequence. This sequence boundary heralds an abrupt increase in δ13Ccarb values, up to +14‰. These extremely high δ13Ccarb values and high Sr/Ca ratios persist throughout the overlying sequence, as a result of progressive and enhanced restriction of the foreland basin system. Basin restriction at this stage has implications for the paleontological and chemostratigraphic record of epicontinental basins of the West Gondwana in the terminal Ediacaran. Late Ediacaran Sr-rich intervals in these basins show unusually nonradiogenic 87Sr/86Sr ratios, which may represent local depositional controls and deviations from the modern oceanographic models. Physiographic barriers and stressful conditions likely represented extreme environments for metazoan colonization.pt_BR
dc.identifier.citationCAETANO FILHO, S. et al. Sequence stratigraphy and chemostratigraphy of an Ediacaran-Cambrian foreland-related carbonate ramp (Bambuí Group, Brazil). Precambrian Research, v. 331, p. 105365, set. 2019. Disponível em: <https://www.sciencedirect.com/science/article/pii/S0301926819300786>. Acesso em: 10 mar. 2020.pt_BR
dc.identifier.doihttps://doi.org/10.1016/j.precamres.2019.105365pt_BR
dc.identifier.issn0301-9268
dc.identifier.urihttp://www.repositorio.ufop.br/handle/123456789/12072
dc.identifier.uri2https://www.sciencedirect.com/science/article/pii/S0301926819300786pt_BR
dc.language.isoen_USpt_BR
dc.rightsrestritopt_BR
dc.subjectForeland basinspt_BR
dc.subjectSão Francisco Basinpt_BR
dc.subjectCarbon isotopespt_BR
dc.subjectCarbonate rockspt_BR
dc.titleSequence stratigraphy and chemostratigraphy of an Ediacaran-Cambrian foreland-related carbonate ramp (Bambuí Group, Brazil).pt_BR
dc.typeArtigo publicado em periodicopt_BR
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