Data/hora: 02/06/2024 10:51:53

Provedor de dados: | 42
País: | Brazil
Título: | Transpressive dextral shear in the Italva-Itaperuna section, Northern State of Rio de Janeiro, Brazil
Autores: | Karniol,Tiago R.; Machado,Rômulo; Dehler,Nolan M.
Data: | 2008-09-01
Ano: | 2008
Palavras-chave: | Ribeira Belt; Kinematics; Transpression; Syncontractional extension.
Resumo: | Structural analysis carried out on a segment of the Neoproterozoic Ribeira Belt, southeastern Brazil, show that it represents part of the transpressive dextral orogen related to the Central Mantiqueira Province. NNE-trending and steeply dipping regional mylonitic belts form anastomosed geometry, and describe a map-scale, S-C-like structure that is characterized by their deflection towards NE near the Além Paraíba Lineament. Lithological and structural control related to deformation partition were responsible for the formation of felsic mylonitic granulites with S-type granites lenses developed in ductile shear zones, alternated with less deformed intermediate to basic granulites associated with charnockites. The dextral shear sense indicators are consistent with transpressive deformation in the region and are common especially at the border of the main shear zones. The presence of S-type leucogranite may lead to variations of linear and planar relationships, which result in local extension zones. These elements are consistent with oblique continental collision considering the São Francisco Craton as a stable block.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300016
Editor: | Academia Brasileira de Ciências
Relação: | 10.1590/S0001-37652008000300016
Formato: | text/html
Fonte: | Anais da Academia Brasileira de Ciências  v.80 n.3 2008
Fonte: | info:eu-repo/semantics/openAccess