Recurring extensional and strike-slip tectonics after the Neoproterozoic collisional events in the southern Mantiqueira province

Detalhes bibliográficos
Autor(a) principal: Almeida,Renato P.
Data de Publicação: 2012
Outros Autores: Santos,Maurício G. M., Fragoso-Cesar,Antonio R.S., Janikian,Liliane, Fambrini,Gelson L.
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=S0001-37652012000200009
Resumo: In Eastern South America, a series of fault-bounded sedimentary basins that crop out from Southern Uruguay to Southeastern Brazil were formed after the main collisional deformation of the Brasiliano Orogeny and record the tectonic events that affected the region from the Middle Ediacaran onwards. We address the problem of discerning the basin-forming tectonics from the later deformational events through paleostress analysis of more than 600 fault-slip data, mainly from the Camaquã Basin (Southern Brazil), sorted by stratigraphic level and cross-cutting relationships of superposed striations, and integrated with available stratigraphic and geochronological data. Our results show that the Camaquã Basin was formed by at least two distinct extensional events, and that rapid paleostress changes took place in the region a few tens of million years after the major collision (c.a. 630 Ma), probably due to the interplay between local active extensional tectonics and the distal effects of the continued amalgamation of plates and terranes at the margins of the still-forming Gondwana Plate. Preliminary paleostress data from the Castro Basin and published data from the Itajaí Basin suggest that these events had a regional nature.
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spelling Recurring extensional and strike-slip tectonics after the Neoproterozoic collisional events in the southern Mantiqueira provinceCamaquã BasinEarth SciencesNeoproterozoicPaleostress AnalysisRift BasinSouthern BrazilIn Eastern South America, a series of fault-bounded sedimentary basins that crop out from Southern Uruguay to Southeastern Brazil were formed after the main collisional deformation of the Brasiliano Orogeny and record the tectonic events that affected the region from the Middle Ediacaran onwards. We address the problem of discerning the basin-forming tectonics from the later deformational events through paleostress analysis of more than 600 fault-slip data, mainly from the Camaquã Basin (Southern Brazil), sorted by stratigraphic level and cross-cutting relationships of superposed striations, and integrated with available stratigraphic and geochronological data. Our results show that the Camaquã Basin was formed by at least two distinct extensional events, and that rapid paleostress changes took place in the region a few tens of million years after the major collision (c.a. 630 Ma), probably due to the interplay between local active extensional tectonics and the distal effects of the continued amalgamation of plates and terranes at the margins of the still-forming Gondwana Plate. Preliminary paleostress data from the Castro Basin and published data from the Itajaí Basin suggest that these events had a regional nature.Academia Brasileira de Ciências2012-06-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200009Anais da Academia Brasileira de Ciências v.84 n.2 2012reponame:Anais da Academia Brasileira de Ciências (Online)instname:Academia Brasileira de Ciências (ABC)instacron:ABC10.1590/S0001-37652012005000034info:eu-repo/semantics/openAccessAlmeida,Renato P.Santos,Maurício G. M.Fragoso-Cesar,Antonio R.S.Janikian,LilianeFambrini,Gelson L.eng2012-10-11T00:00:00Zoai:scielo:S0001-37652012000200009Revistahttp://www.scielo.br/aabchttps://old.scielo.br/oai/scielo-oai.php||aabc@abc.org.br1678-26900001-3765opendoar:2012-10-11T00:00Anais da Academia Brasileira de Ciências (Online) - Academia Brasileira de Ciências (ABC)false
dc.title.none.fl_str_mv Recurring extensional and strike-slip tectonics after the Neoproterozoic collisional events in the southern Mantiqueira province
title Recurring extensional and strike-slip tectonics after the Neoproterozoic collisional events in the southern Mantiqueira province
spellingShingle Recurring extensional and strike-slip tectonics after the Neoproterozoic collisional events in the southern Mantiqueira province
Almeida,Renato P.
Camaquã Basin
Earth Sciences
Neoproterozoic
Paleostress Analysis
Rift Basin
Southern Brazil
title_short Recurring extensional and strike-slip tectonics after the Neoproterozoic collisional events in the southern Mantiqueira province
title_full Recurring extensional and strike-slip tectonics after the Neoproterozoic collisional events in the southern Mantiqueira province
title_fullStr Recurring extensional and strike-slip tectonics after the Neoproterozoic collisional events in the southern Mantiqueira province
title_full_unstemmed Recurring extensional and strike-slip tectonics after the Neoproterozoic collisional events in the southern Mantiqueira province
title_sort Recurring extensional and strike-slip tectonics after the Neoproterozoic collisional events in the southern Mantiqueira province
author Almeida,Renato P.
author_facet Almeida,Renato P.
Santos,Maurício G. M.
Fragoso-Cesar,Antonio R.S.
Janikian,Liliane
Fambrini,Gelson L.
author_role author
author2 Santos,Maurício G. M.
Fragoso-Cesar,Antonio R.S.
Janikian,Liliane
Fambrini,Gelson L.
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Almeida,Renato P.
Santos,Maurício G. M.
Fragoso-Cesar,Antonio R.S.
Janikian,Liliane
Fambrini,Gelson L.
dc.subject.por.fl_str_mv Camaquã Basin
Earth Sciences
Neoproterozoic
Paleostress Analysis
Rift Basin
Southern Brazil
topic Camaquã Basin
Earth Sciences
Neoproterozoic
Paleostress Analysis
Rift Basin
Southern Brazil
description In Eastern South America, a series of fault-bounded sedimentary basins that crop out from Southern Uruguay to Southeastern Brazil were formed after the main collisional deformation of the Brasiliano Orogeny and record the tectonic events that affected the region from the Middle Ediacaran onwards. We address the problem of discerning the basin-forming tectonics from the later deformational events through paleostress analysis of more than 600 fault-slip data, mainly from the Camaquã Basin (Southern Brazil), sorted by stratigraphic level and cross-cutting relationships of superposed striations, and integrated with available stratigraphic and geochronological data. Our results show that the Camaquã Basin was formed by at least two distinct extensional events, and that rapid paleostress changes took place in the region a few tens of million years after the major collision (c.a. 630 Ma), probably due to the interplay between local active extensional tectonics and the distal effects of the continued amalgamation of plates and terranes at the margins of the still-forming Gondwana Plate. Preliminary paleostress data from the Castro Basin and published data from the Itajaí Basin suggest that these events had a regional nature.
publishDate 2012
dc.date.none.fl_str_mv 2012-06-01
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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dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200009
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dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0001-37652012005000034
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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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.84 n.2 2012
reponame:Anais da Academia Brasileira de Ciências (Online)
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instname_str Academia Brasileira de Ciências (ABC)
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reponame_str Anais da Academia Brasileira de Ciências (Online)
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repository.name.fl_str_mv Anais da Academia Brasileira de Ciências (Online) - Academia Brasileira de Ciências (ABC)
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