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Title: The Barreiro suite in the central Ribeira Belt (SE-Brazil) : a late tonian tholeiitic intraplate magmatic event in the distal passive margin of the São Francisco Paleocontinent
Authors: Heilbron, Monica
Oliveira, Caroline
Lobato, Marcela
Valeriano, Claudio de Morisson
Dussin, Ivo
Dantas, Elton Luiz
Simonetti, Antonio
Bruno, Henrique
Corrales, Felipe
Socoloff, Eduardo
Assunto:: Grupo Andrelândia
Datação arqueológica
Issue Date: 2019
Publisher: Sociedade Brasileira de Geologia
Citation: HEILBRON, Monica et al. The Barreiro suite in the central Ribeira Belt (SE-Brazil): a late Tonian tholeiitic intraplate magmatic event in the distal passive margin of the São Francisco Paleocontinent. Brazilian Journal of Geology, v. 49, n. 2, e20180129, 2019. DOI: Disponível em: Acesso em: 23 jan. 2020.
Abstract: New geochemical, U-Pb, Lu-Hf and Sr-Nd data from the Barreiro Suite metabasites in comparison with enclaves within the distal Andrelândia Group and the orthogranulites of the Juiz de Fora Complex are presented. Geochemical data suggest intraplate setting, with high and low-TiO 2 , TDM Nd ages between 1.80 and 1.41 Ga, negative ΕNd t and ( 87 Sr/ 86 Sr)i between 0.714 and 0.747. Results contrast with part of the Juiz de Fora Complex enclaves, with island arc tholeiites- calcalkaline basalts (IAT-CAB) geochemical signatures, TDM Nd ages between 2.58 and 2.16 Ga, positive ΕNd t values and (87Sr/86Sr) i between 0.700 and 0.712. U-Pb data for the Barreiro Suite yielded a crystallization age of 766 ± 13 Ma and a metamorphic overprint of 619 ± 6 Ma. The results indicate three episodes of mafic magmatism in the Occidental terrane of the Ribeira Belt. The two older episodes are related to Rhyacian arc evolution (ca. 2.2 to 2.1 Ga) and to the Statherian (ca. 1.7 Ga) tectonics, and occur only within the Juiz de Fora Complex, while the younger ca. 766 Ma episode constrains the timing of distal passive margin evolution. An important implication is that these late Tonian metabasic rocks could have been a source of detrital zircons for the sedimentation along the distal Andrelândia basin.
Licença:: (CC BY) - © 2019 The autors. This is an open access article distributed under the terms of the Creative Commons license.
Appears in Collections:IG - Artigos publicados em periódicos

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