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Metasedimentary Rocks of the Northern Portion of the Macururé Domain, Sergipano Belt, Northeastern Brazil: Geochemical Characterization of Their Protoliths and Tectonic Implications

DOI: http://dx.doi.org/10.18190/1980-8208/estudosgeologicos.v24n2p89-107

https://www.ufpe.br/estudosgeologicos/ 

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Mariucha M. C. de Lima1, Thyego R. da Silva1, Valderez P. Ferreira1 & José M. R. da Silva1

 

Resumo:  Caracterização dos protólitos de rochas metaclásticas de unidades metamórficas do domínio Macururé, Cinturão Sergipano, com base em elementos maiores e traços, é discutida neste trabalho. Dados geoquímicos para essas rochas metassedimentares indicam predominância de grauvacas nos protólitos que contem também folhelhos e arcóseos subordinados. Elementos maiores, traços e terras raras sugerem fonte para estas rochas com composição da crosta superior média para os protólitos das rochas metassedimentares deste domínio. Mistura de fonte de detritos são indicados para estas rochas resultantes principalmente de detritos de composição intermediária a ácido. Dados de rocha total sugerem arco de ilhas e/ou de margem ativa como cenário geodinâmico mais provável para deposição dos precursores sedimentares das unidades estudadas. Neste contexto, uma configuração back-arc explicaria a natureza mista das áreas fontes inferidas, com detritos do embasamento soerguido e relacionadas ao arco como membros finais das misturas. A geoquímica semelhante das metassedimentares e litologias subjacentes atesta derivação a partir de uma mesma fonte crustal.

Palavras-chave: Cinturão Sergipano; rochas metassedimentares; litogeoquímica; proveniência; ambiente tectônico.

 

Abstract: Characterization of the metasedimentary protoliths of metamorphic units of the Macururé Domain, Sergipano Belt, in northeastern Brazil, based on the behavior of their major and trace element chemistry is discussed in this paper. Geochemical data indicate predominance of greywackes in the protoliths of metaclastics of the Macururé Domain, with subordinate shales and arkoses. Major, trace and rare-earth element chemistry indicates a source with an average upper crustal composition for the protoliths of metasedimentary rocks of Macururé Domain. Mixed-sourced detritus are suggested for these rocks mainly derived from felsic and acidic/recycled detritus. The overall data consistently suggest a continental magmatic arc and/or active margin setting as the more probable geodynamic scenario for the deposition of the sedimentary precursors of the studied units. In this context, a back-arc setting can account for the mixed nature of the inferred source areas with uplifted old basement and arc-related detritus as the end members of the mixtures. The comparable geochemistry of the metasediments and their underlying lithologies attests to their derivation from same crustal source.

Key words: Sergipano Belt; metasedimentary rocks; lithochemistry; provenance; tectonic setting

 

1 NEG-LABISE, Department of Geology, UFPE, Recife, PE, 50740-930, Brazil. Corresponding author: mariucha_geo@yahoo.com.br

 

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