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Neoproterozoic oceanic remnants in eastern Brazil: Further evidence and refutation of an exclusively ensialic evolution for the Araçuaí–West Congo orogen

1998; Geological Society of America; Volume: 26; Issue: 6 Linguagem: Inglês

10.1130/0091-7613(1998)026 2.3.co;2

1943-2682

Antônio Carlos Pedrosa‐Soares, Philippe Vidal, O. H. Leonardos, Benjamim Bley de Brito Neves,

earthquake and tectonic studies

Research Article| June 01, 1998 Neoproterozoic oceanic remnants in eastern Brazil: Further evidence and refutation of an exclusively ensialic evolution for the Araçuaí–West Congo orogen Antônio Carlos Pedrosa-Soares; Antônio Carlos Pedrosa-Soares 1Universidade Federal de Minas Gerais, Instituto de Geociências, Campus Pampulha, Belo Horizonte 31270-901, MG, Brazil Search for other works by this author on: GSW Google Scholar Philippe Vidal; Philippe Vidal 2Université Blaise-Pascal, 5 rue Kessler, Clermont-Ferrand 63038, France Search for other works by this author on: GSW Google Scholar Othon Henry Leonardos; Othon Henry Leonardos 3Universidade de Brasília, IGC, Brasølia 70910-900, DF, Brazil Search for other works by this author on: GSW Google Scholar Benjamin Bley de Brito Neves Benjamin Bley de Brito Neves 4Universidade de São Paulo, IG, São Paulo 05422-970, SP, Brazil Search for other works by this author on: GSW Google Scholar Author and Article Information Antônio Carlos Pedrosa-Soares 1Universidade Federal de Minas Gerais, Instituto de Geociências, Campus Pampulha, Belo Horizonte 31270-901, MG, Brazil Philippe Vidal 2Université Blaise-Pascal, 5 rue Kessler, Clermont-Ferrand 63038, France Othon Henry Leonardos 3Universidade de Brasília, IGC, Brasølia 70910-900, DF, Brazil Benjamin Bley de Brito Neves 4Universidade de São Paulo, IG, São Paulo 05422-970, SP, Brazil Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1998) 26 (6): 519–522. https://doi.org/10.1130/0091-7613(1998)026 2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Antônio Carlos Pedrosa-Soares, Philippe Vidal, Othon Henry Leonardos, Benjamin Bley de Brito Neves; Neoproterozoic oceanic remnants in eastern Brazil: Further evidence and refutation of an exclusively ensialic evolution for the Araçuaí–West Congo orogen. Geology 1998;; 26 (6): 519–522. doi: https://doi.org/10.1130/0091-7613(1998)026 2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The Araçuaí (eastern Brazil) and West Congo (southwestern Africa) belts are counterparts of the same Neoproterozoic orogen located between the São Francisco and Congo cratons. The Macaúbas Group represents a major passive margin sequence and is a key unit for interpreting the evolution of that orogen. The Salinas Formation is the distal rock assemblage of the Macaúbas Group and consists of a deep-sea sand-mud sequence, and a volcanic-sedimentary unit called the Ribeirão da Folha facies. The latter includes metamorphosed volcanic-exhalative sediments associated with ocean-floor basalts (amphibolites). The magmatic protoliths of these amphibolites crystallized at about 816 ± 72 Ma (Sm-Nd whole-rock isochron, ϵNd(t) =+3.8 ± 0.2). Regional metamorphism reached the amphibolite facies at about 630 Ma (Rb-Sr whole-rock isochron), when slabs of ultramafic rocks were tectonically emplaced over the Ribeirão da Folha facies. We consider this volcanic-sedimentary facies and the coeval slabs of ultramafic rocks to be remnants of a branch of the Adamastor-Brazilide ocean. The extensive occurrence of syntectonic to late tectonic calc-alkalic granitoids along the internal domain of the Araçuaí belt implies that a reasonably large amount of ocean crust was consumed, via an east-dipping subduction zone, during formation of the Araçuaí–West Congo orogen. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.