Comparações de padrões geoquímicos de clássicos ambientes tectônicos modernos com associações litológicas do Domínio Canindé, Cinturão Sergipano

• Autor(a) principal: Cardoso, Alan Dantas
• Data de Publicação: 2019
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UFS
• Texto Completo: http://ri.ufs.br/jspui/handle/riufs/12131
• topic: Geologia; Ensino de geologia; Ambientes tectônicos; Rochas básicas; Zona de subducção; Canindé de São Francisco (SE); Geotectonica; CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOLOGIA::GEOTECTONICA

In this research we show comparisons between the Canindé Domain rocks (Novo Gosto and Gentileza Units and the Canindé Intrusive Suite) belonging to the Sergipano Belt, with modern tectonic environments where similar rocks are generated (rift and arc environments). The Canindé Domain rocks were selected for this research due to the big divergence in the interpretation of the geotectonic settings of these Brasiliano association of rocks. These rocks are essentially basic 9rocks, which occur both intercaled with fine metasediments (Novo Gosto Unit) and with mixing features with acid-intermediate magma (Gentileza Unit), and finally occur as a gabric body (Canindé Intrusive Suite). Most of the rocks occur deformed and metamorphosed in medium grade. For the comparisons we used whole rock geochemistry data from basic rocks (minor and traces elements) of a magmatic arc (South Andes), island arch (Indonesian Arch), retro-arc (World Numerical Model), narrow type rift (East African Rifte) and broad type rift (Basin and Range). Due to the metamorphic, hydrothermal and deformational processes that commonly modify the chemical characteristics of the rocks, element mobility studies have been performed on the DC rocks to identify the mobilized elements. The elements of the LILE group are mostly dispersed in the binary diagrams, possibly having been remobilized while most of the ETRs and HFSE are immovable. Comparisons have yielded important results and the most geochemical-resembling similar modern environments are the magmatic arc, retro-arc and rift environment with a close subduction zone. Thus, we suggest with this results that the rocks of the Canindé Domain are directly related or adjacent to a subduction zone.