Transpressive dextral shear in the Italva-Itaperuna section, Northern State of Rio de Janeiro, Brazil

Detalhes bibliográficos
Autor(a) principal: Karniol,Tiago R.
Data de Publicação: 2008
Outros Autores: Machado,Rômulo, Dehler,Nolan M.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Anais da Academia Brasileira de Ciências (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300016
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.
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spelling Transpressive dextral shear in the Italva-Itaperuna section, Northern State of Rio de Janeiro, BrazilRibeira Beltkinematicstranspressionsyncontractional extensionStructural 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.Academia Brasileira de Ciências2008-09-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300016Anais da Academia Brasileira de Ciências v.80 n.3 2008reponame:Anais da Academia Brasileira de Ciências (Online)instname:Academia Brasileira de Ciências (ABC)instacron:ABC10.1590/S0001-37652008000300016info:eu-repo/semantics/openAccessKarniol,Tiago R.Machado,RômuloDehler,Nolan M.eng2008-08-28T00:00:00Zoai:scielo:S0001-37652008000300016Revistahttp://www.scielo.br/aabchttps://old.scielo.br/oai/scielo-oai.php||aabc@abc.org.br1678-26900001-3765opendoar:2008-08-28T00:00Anais da Academia Brasileira de Ciências (Online) - Academia Brasileira de Ciências (ABC)false
dc.title.none.fl_str_mv Transpressive dextral shear in the Italva-Itaperuna section, Northern State of Rio de Janeiro, Brazil
title Transpressive dextral shear in the Italva-Itaperuna section, Northern State of Rio de Janeiro, Brazil
spellingShingle Transpressive dextral shear in the Italva-Itaperuna section, Northern State of Rio de Janeiro, Brazil
Karniol,Tiago R.
Ribeira Belt
kinematics
transpression
syncontractional extension
title_short Transpressive dextral shear in the Italva-Itaperuna section, Northern State of Rio de Janeiro, Brazil
title_full Transpressive dextral shear in the Italva-Itaperuna section, Northern State of Rio de Janeiro, Brazil
title_fullStr Transpressive dextral shear in the Italva-Itaperuna section, Northern State of Rio de Janeiro, Brazil
title_full_unstemmed Transpressive dextral shear in the Italva-Itaperuna section, Northern State of Rio de Janeiro, Brazil
title_sort Transpressive dextral shear in the Italva-Itaperuna section, Northern State of Rio de Janeiro, Brazil
author Karniol,Tiago R.
author_facet Karniol,Tiago R.
Machado,Rômulo
Dehler,Nolan M.
author_role author
author2 Machado,Rômulo
Dehler,Nolan M.
author2_role author
author
dc.contributor.author.fl_str_mv Karniol,Tiago R.
Machado,Rômulo
Dehler,Nolan M.
dc.subject.por.fl_str_mv Ribeira Belt
kinematics
transpression
syncontractional extension
topic Ribeira Belt
kinematics
transpression
syncontractional extension
description 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.
publishDate 2008
dc.date.none.fl_str_mv 2008-09-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
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status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300016
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300016
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0001-37652008000300016
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Academia Brasileira de Ciências
publisher.none.fl_str_mv Academia Brasileira de Ciências
dc.source.none.fl_str_mv Anais da Academia Brasileira de Ciências v.80 n.3 2008
reponame:Anais da Academia Brasileira de Ciências (Online)
instname:Academia Brasileira de Ciências (ABC)
instacron:ABC
instname_str Academia Brasileira de Ciências (ABC)
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reponame_str Anais da Academia Brasileira de Ciências (Online)
collection Anais da Academia Brasileira de Ciências (Online)
repository.name.fl_str_mv Anais da Academia Brasileira de Ciências (Online) - Academia Brasileira de Ciências (ABC)
repository.mail.fl_str_mv ||aabc@abc.org.br
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