Description and hierarchy of ductile deformation events in the Camalaú region, state of Paraíba, central portion of the Alto Moxotó Terrane, Borborema Province, Brazil

Journal of the Geological Survey of Brazil

Endereço:
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Brasília / DF
70040-904
Site: https://jgsb.cprm.gov.br/index.php/journal/index
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ISSN: 2595-1939
Editor Chefe: Evandro Luiz Klein
Início Publicação: 15/05/2018
Periodicidade: Quadrimestral
Área de Estudo: Multidisciplinar, Área de Estudo: Multidisciplinar

Description and hierarchy of ductile deformation events in the Camalaú region, state of Paraíba, central portion of the Alto Moxotó Terrane, Borborema Province, Brazil

Ano: 2020 | Volume: 3 | Número: 1
Autores: Lauro Cézar M. de Lira Santos, Caio dos S. Pereira, Haroldo M. Lima, Pedro A. Guedes, Roberta S. de Medeiros, Jefferson W. Alves Silva, José Ferreira de A. Neto, Glenda L. Santos, Mariana S. Paixão
Autor Correspondente: Lauro Cézar M. de Lira Santos | [email protected]

Palavras-chave: Ductile deformation in Camalaú, Moxotó Terrane, Borborema Province

Resumos Cadastrados

Resumo Inglês:

The Borborema Province (NE Brazil) has a long history of deformation, magmatism and metamorphism

during the Precambrian Eon. Thus, it represents a natural laboratory to investigate widely developed

ductile-deformation markers, such as major fold belts and large-scale shear zones. This paper descri

-bes the structural evolution of a complex folded area of the Alto Moxotó Terrane, Central Borborema

Province. In this region, para-derived rocks of the Sertânia Complex are intruded by orthogneisses and

migmatitic orthogneisses. The Geophysical magnetometric expressions of the Borberma Province are

characterized by strong aligned and folded magnetic lineaments and integrated structural analysis, allo

-wed us to identify three ductile deformation episodes. Brittle tectonics is also present, but not described.

D1 stage represents the basement structural framework restricted to local structural windows of ancient

orthogneisses and migmatites that are not mappable at the work scale. D2 deformation is widespread

throughout the Central Borborema Province, producing nappes that mark top-to-NW tectonic vergence.

Foliation and lineation attitudes are compatible with progressive deformation from tangential to strike

-slip tectonics (i.e. D2 to D3). The latter is associated with the NE-SW Xinxó and Congo-Cruzeiro do

Nordeste sinistral strike-slip shear zones, producing refold patterns that resemble Type-3 interference

geometry. Based on airborne magnetic geophysical imaging interpretations and mesoscopic observa

-tions, we suggest that progressive deformation strongly affected the region and overprinted at large

scale early formed rocks.