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Title: Sedimentary provenance and role of tectonic inheritance on the control of the Macaúbas group, eastern margin of São Francisco Craton (SE Brazil).
Authors: Oliveira, Rosana Gonçalves
Martins, Maximiliano de Souza
Queiroga, Gláucia Nascimento
Souza, Maria Eugênia Silva de
Lana, Cristiano de Carvalho
Alkmim, Ana Ramalho
Silva, Marco Antônio Leandro da
Bueno, Cássio
Linhares, Davidson
Keywords: U–Pb geochronology
Cawood diagram
Macaúbas basin
Issue Date: 2021
Citation: OLIVEIRA, R. G. et al. Sedimentary provenance and role of tectonic inheritance on the control of the Macaúbas group, eastern margin of São Francisco Craton (SE Brazil). Journal of South American Earth Sciences, v. 109, 2021. Disponível em: <>. Acesso em: 29 abr. 2022.
Abstract: The Neoproterozoic Macaúbas Group represents the precursor basin system of the Araçuaí–West Congo orogen, located in the southern margin of Sao ̃ Francisco Craton, and records a Tonian volcano-sedimentary succession, at the base, overlain by a Cryogenian sequence related to the Neoproterozoic global glacial event. Detailed strat- igraphic surveys along the Tonian units allowed the identification of two lithofacies associations related to al- luvial fan and braided river environments, while the three Cryogenian lithofacies associations indicate a glaciomarine environment associated with extensive tectonics that has evolved into a marine environment. The results show that the age spectra of the Tonian and Cryogenian units are similar, differing mainly for an increased peak in the Cryogenian sample in ca. 1.0 Ga, where the primary source is probably related to those magmatic rocks associated with the Stenian-Tonian extensional breakup of the Sao ̃ Francisco-Congo paleocontinent. The KS-Test shows that not all the Tonian samples are similar to each other, as in all the Cryogenian samples. The detailed stratigraphic and structural surveys associated with the geochronological U–Pb data allow us to interpret that the Tonian and the basal Cryogenian sequences were deposited in two episodes of an active intracontinental tectonic context related to fault reactivations along the WNW-ESE Pirapora aulacogen structures in superimposed basin-cycles, the middle-to late-Cryogenian sequences extrapolated the WNW-ESE boundaries while the basin local depocenter and its surroundings expanded to a large depocenter during the basin evolution.
ISSN: 0895-9811
Appears in Collections:DEGEO - Artigos publicados em periódicos

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