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• W2005775080 abstract "The granulitic Jequié Complex is composed of supracrustal rocks intruded during Late Archean times by batholithic high-K granites and less abundant intermediate rocks. The Caraíba Complex consists of supracrustal rocks intruded by tonalitic-granodioritic rocks and granites during Archean and Early Proterozoic times, with subordinated basic rocks. The Jacobina sedimentary sequence, the tholeiitic and calc-alkaline volcano-sedimentary Contendas-Mirante and Rio Itapicura sequences, and the granulitic Itabuna Belt — which is subdivided into mainly plutonic, tholeiitic, calc-alkaline, and shoshonitic sequences — were formed during the Early Proterozoic. In the proposed model of geotectonic evolution, the Itabuna Belt corresponds to a subduction-related continental margin magmatic arc and the Rio Itapicuru greenstone to a back-arc basin. The Jacobina sequence, composed mostly of coarse-grained clastic and metapelitic sediments, could have been formed in an aborted rift, while the tholeiitic and calc-alkaline sequences of Contendas-Mirante could represent the opening and closing stages, respectively, of a larger basin. As rochas granulíticas do Complexo Jequié compreendem rochas supracrustais intrudidas, no Arqueano, por granitos potássicos batolíticos e rochas intermediárias subordinadas. O Complexo Caraíba consiste de rochas supracrustais intrudidas por tonalito-granodioritos e granitos, durante o Arqueano e Proterozóico Inferior, com rochas básicas associadas. A sequência sedimentar de Jacobina, as sequências vulcano-sedimentares toleíticas e cálcio-alcalinas de Contendas-Mirante e Rio Itapicuru e o cinturão granulítico Itabuna subdividido em sequências toleítica, cálcio-alcalina e shoshonítica, predominantemente plutônicas, teriam sido formadas durante o Proterozóico Inferior. A evolução geotectônica proposta considera que o Cinturâo Itabuna corresponda a um arco magmático de margem continental, relacionado a subducção, e que o “greenstone” Rio Itapicuru relacione-se a uma bacia de retro-arco. A sequência Jacobina, composta predominantemente de metapelitos e clásticos grosseiros, poderia ter sido formada em um “rift” abortado, enquanto as sequência toleíticas e cálcio-alcalinas de Contendas-Mirante representariam os estágios de abertura e fechamento, respectivamente, de uma bacia maior." @default.
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• W2005775080 date "1989-01-01" @default.
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• W2005775080 title "Geochemical evolution of eastern Bahia, Brazil: A probable Early Proterozoic subduction-related magmatic arc" @default.
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• W2005775080 doi "https://doi.org/10.1016/0895-9811(89)90041-2" @default.
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