Recurring extensional and strike-slip tectonics after the Neoproterozoic collisional events in the southern Mantiqueira province
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | , , , |
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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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 |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200009 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200009 |
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 |
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.84 n.2 2012 reponame:Anais da Academia Brasileira de Ciências (Online) instname:Academia Brasileira de Ciências (ABC) instacron:ABC |
instname_str |
Academia Brasileira de Ciências (ABC) |
instacron_str |
ABC |
institution |
ABC |
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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1754302858845487104 |