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Oblique collision and accretionary processes in the South Borborema Province: Insights from structural geology and geophysical data

2022; Elsevier BV; Volume: 844; Linguagem: Inglês

10.1016/j.tecto.2022.229607

1879-3266

Gabriela M. Almeida, Reinhardt A. Fuck, Elton Luiz Dantas, Sanmy Silveira Lima,

Geochemistry and Geologic Mapping

During orogenesis, the forming structures vary according to several factors such as the nature of rocks, geological environment, P-T conditions, and type of collision. Deformational styles play a significant role in orogenic processes. While thin-skinned tectonics comprise only supracrustal deformation, in thick-skinned tectonics both supracrustal rocks and the basement are deformed reaching Moho depths. Both styles may coexist in a single orogenic system and the recognition of different sectors may help to unravel the nature of the orogen. In this paper, we apply the definition of tectonic styles to the São Miguel do Aleixo Shear Zone, a major transpressive shear zone in the Sergipano Belt, NE Brazil. It separates domains with different structural and metamorphic grades and provides evidence for understanding the tectonic implications of this structure and its role in the evolution of the orogen. We suggest that the São Miguel do Aleixo Shear Zone is a major crustal boundary formed during the oblique collision with and a possible transitional region between areas with dominant thin-skinned and thick-skinned tectonics. The presence of both tectonic styles together with metamorphic grade and geological environment lead to suggest that accretionary processes had a key role in the evolution of the Sergipano Belt.