Magmatismo Toniano de Arco Continental do Complexo Porongos, Cinturāo Dom Feliciano, Sul do Brasil

Autores

DOI:

https://doi.org/10.11606/issn.2316-9095.v23-208078

Palavras-chave:

Magmatismo Toniano, Arco Magmático Continental, Complexo Metamórfico Porongos, Cinturão de Dobramento e Empurrão, Rochas Metavulcânicas

Resumo

Este estudo apresenta novas informações sobre deformação, metamorfismo e ambiente tectônico das rochas metavulcânicas da porção sul do Complexo Porongos, sul do Brasil. A análise estrutural permitiu a identificação de três fases de deformação, formadas sob condições dúcteis a semidúcteis. D1 progrediu por meio de partição da deformação, compreendendo dobras fechadas a isoclinais e uma foliação plano axial. Nesse estágio, prevalece o cisalhamento simples, resultando em dobras isoclinais, porfiroclastos do tipo sigma, foliação de transposição e rochas miloníticas. D2 compreende dobras abertas a suaves e uma clivagem plano axial. A formação de bandas de cisalhamento é atribuída à fase semidúctil D3. A assembleia mineral representada por fengita + clorita + clinozoisita-epidoto + actinolita + albita + quartzo associado às temperaturas obtidas por meio do geotermômetro de clorita (316 °C) indicam condições de fácies xisto verde. Os protólitos dessas rochas metavulcânicas são geoquimicamente discriminados como cálcio-alcalinos, dacito a riodacito, com composições peraluminosas. As composições de elementos traços em rocha total mostram enriquecimento em elementos litófilos de grande raio iônico (LILE) e elementos terras raras leves (LREE) e depleção em elementos terras raras pesadas (HREE). Também foram observadas anomalias  negativas de Nb, P, Ti e Ta. Todas essas características geoquímicas são típicas de rochas formadas em arcos magmáticos continentais. A comparação geoquímica com outras rochas ortometamórficas tonianas pré-colisionais do Cinturão Dom Feliciano demonstra fortes semelhanças, o que corrobora a interpretação de ambiente de arco continental para a origem dessas rochas tonianas. 

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2023-08-17

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Rodrigues, R. A. de F. ., Pertille, J. ., Gervasoni, F. ., Arab, P. B. ., Petry, T. S. ., Martins, M. L. J. ., Mesquita, Áquila F. ., Laux, J. H. ., Martins, B. S. ., & Nascimento, L. B. . (2023). Magmatismo Toniano de Arco Continental do Complexo Porongos, Cinturāo Dom Feliciano, Sul do Brasil. Geologia USP. Série Científica, 23(3), 19-45. https://doi.org/10.11606/issn.2316-9095.v23-208078

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