O Grupo Canastra em sua área-tipo, região de Tapira, sudoeste do estado de Minas Gerais
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.5327/Z1519-874X2012000200006 http://hdl.handle.net/11449/73471 |
Resumo: | This work aimed at describing the Neoproterozoic evolution of a Southern Brasília Fold Belt segment, in Tapira area (southwest of Minas Gerais state, Brazil), using detailed geologic mapping. This area, the Canastra Group type-area, has showed great tectonic and stratigraphic complexities unlike the simplicity suggested in previous works. From recognizing the main tectonic discontinuities, it was possible to subdivide the area into some domains. In the west domain, they were individualized in tectonic sheet I, marked by pelitic rocks and pelitic-graphite rocks with psammitic intercalations, and II, pelitic rocks with psammitic and mafic-ultramafic intercalations overlapped by gneisses. In the east domain, a group of three tectonic sheets was defined, in which, in the two lower tectonic sheets, pelitic and pelitic-graphite rocks with psammitic rock intercalations prevailed, which is different in metamorphic conditions. The lower tectonic sheet is marked by mineralogical associations with muscovite + chlorite + quartz ± graphite ± albite, without biotite; however, the superior one is with muscovite + quartz + garnet ± chlorite ± biotite ± chloritoid ± graphite ± albite. In the upper tectonic sheet, pelitic rocks with local contributions of psammitic and ultramafics rocks occur. In the south domain, psammitic rocks basically occur with contributions of pelitics and rudaceous rocks, where the preservation of textures and sedimentary structures is common. Rocks of the several domains are interpreted as part of a passive continental margin basin, located in the western margin of the São Francisco paleocontinent. Thus, the south domain rocks would represent the facies of proximal platform; rocks of the lower and middle tectonic sheets (east domain) and of the tectonic sheet I (west domain) are of facies distal platform; and the ones from the upper tectonic sheet (east domain) and tectonic sheet II (west domain) were acknowledged as deposited in an environment of continental shelf and/or oceanic seafoor. |
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O Grupo Canastra em sua área-tipo, região de Tapira, sudoeste do estado de Minas GeraisThe Canastra Group in the type-area, Tapira region, southwest of Minas Gerais State, BrazilAraxá GroupBambuí GroupBrasília fold-thrust beltTectonic sheetscontinental shelfdepositional environmentfold and thrust beltfold beltgneissmineralogyProterozoicseafloorsedimentary structurestratigraphytectonic evolutiontextureultramafic rockBrazilMinas GeraisCanastraThis work aimed at describing the Neoproterozoic evolution of a Southern Brasília Fold Belt segment, in Tapira area (southwest of Minas Gerais state, Brazil), using detailed geologic mapping. This area, the Canastra Group type-area, has showed great tectonic and stratigraphic complexities unlike the simplicity suggested in previous works. From recognizing the main tectonic discontinuities, it was possible to subdivide the area into some domains. In the west domain, they were individualized in tectonic sheet I, marked by pelitic rocks and pelitic-graphite rocks with psammitic intercalations, and II, pelitic rocks with psammitic and mafic-ultramafic intercalations overlapped by gneisses. In the east domain, a group of three tectonic sheets was defined, in which, in the two lower tectonic sheets, pelitic and pelitic-graphite rocks with psammitic rock intercalations prevailed, which is different in metamorphic conditions. The lower tectonic sheet is marked by mineralogical associations with muscovite + chlorite + quartz ± graphite ± albite, without biotite; however, the superior one is with muscovite + quartz + garnet ± chlorite ± biotite ± chloritoid ± graphite ± albite. In the upper tectonic sheet, pelitic rocks with local contributions of psammitic and ultramafics rocks occur. In the south domain, psammitic rocks basically occur with contributions of pelitics and rudaceous rocks, where the preservation of textures and sedimentary structures is common. Rocks of the several domains are interpreted as part of a passive continental margin basin, located in the western margin of the São Francisco paleocontinent. Thus, the south domain rocks would represent the facies of proximal platform; rocks of the lower and middle tectonic sheets (east domain) and of the tectonic sheet I (west domain) are of facies distal platform; and the ones from the upper tectonic sheet (east domain) and tectonic sheet II (west domain) were acknowledged as deposited in an environment of continental shelf and/or oceanic seafoor.Departamento de Geologia Geral Instituto de Ciências Exatas e da Terra Universidade Federal de Mato Grosso - UFMT, Avenida Fernando Corrêa da Costa 2.367, Bairro Boa Esperanca, CEP 78060-900, Cuiaba, MTDepartamento de Petrologia e Metalogenia Instituto de Geociências e Ciências Exatas Universidade Estadual Paulista - Unesp, Rio Claro, SPDepartamento de Desenvolvimento de Projetos Minerais - DIPM, Vale S/A, Belo Horizonte, MGDepartamento de Petrologia e Metalogenia Instituto de Geociências e Ciências Exatas Universidade Estadual Paulista - Unesp, Rio Claro, SPUniversidade Federal de Mato Grosso (UFMT)Universidade Estadual Paulista (Unesp)Da Silva, Carlos HumbertoSimões, Luiz Sérgio Amarante [UNESP]Damázio, Wellington Leonardo [UNESP]Ferreira, Samuel NunesLuvizotto, George Luiz [UNESP]2014-05-27T11:26:54Z2014-05-27T11:26:54Z2012-08-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article83-98application/pdfhttp://dx.doi.org/10.5327/Z1519-874X2012000200006Geologia USP - Serie Cientifica, v. 12, n. 2, p. 83-98, 2012.1519-874Xhttp://hdl.handle.net/11449/7347110.5327/Z1519-874X20120002000062-s2.0-848663361172-s2.0-84866336117.pdf5234660343892450Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPporGeologia USP: Serie Cientificainfo:eu-repo/semantics/openAccess2023-12-06T06:21:00Zoai:repositorio.unesp.br:11449/73471Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T19:39:27.237553Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
O Grupo Canastra em sua área-tipo, região de Tapira, sudoeste do estado de Minas Gerais The Canastra Group in the type-area, Tapira region, southwest of Minas Gerais State, Brazil |
title |
O Grupo Canastra em sua área-tipo, região de Tapira, sudoeste do estado de Minas Gerais |
spellingShingle |
O Grupo Canastra em sua área-tipo, região de Tapira, sudoeste do estado de Minas Gerais Da Silva, Carlos Humberto Araxá Group Bambuí Group Brasília fold-thrust belt Tectonic sheets continental shelf depositional environment fold and thrust belt fold belt gneiss mineralogy Proterozoic seafloor sedimentary structure stratigraphy tectonic evolution texture ultramafic rock Brazil Minas Gerais Canastra |
title_short |
O Grupo Canastra em sua área-tipo, região de Tapira, sudoeste do estado de Minas Gerais |
title_full |
O Grupo Canastra em sua área-tipo, região de Tapira, sudoeste do estado de Minas Gerais |
title_fullStr |
O Grupo Canastra em sua área-tipo, região de Tapira, sudoeste do estado de Minas Gerais |
title_full_unstemmed |
O Grupo Canastra em sua área-tipo, região de Tapira, sudoeste do estado de Minas Gerais |
title_sort |
O Grupo Canastra em sua área-tipo, região de Tapira, sudoeste do estado de Minas Gerais |
author |
Da Silva, Carlos Humberto |
author_facet |
Da Silva, Carlos Humberto Simões, Luiz Sérgio Amarante [UNESP] Damázio, Wellington Leonardo [UNESP] Ferreira, Samuel Nunes Luvizotto, George Luiz [UNESP] |
author_role |
author |
author2 |
Simões, Luiz Sérgio Amarante [UNESP] Damázio, Wellington Leonardo [UNESP] Ferreira, Samuel Nunes Luvizotto, George Luiz [UNESP] |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Universidade Federal de Mato Grosso (UFMT) Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Da Silva, Carlos Humberto Simões, Luiz Sérgio Amarante [UNESP] Damázio, Wellington Leonardo [UNESP] Ferreira, Samuel Nunes Luvizotto, George Luiz [UNESP] |
dc.subject.por.fl_str_mv |
Araxá Group Bambuí Group Brasília fold-thrust belt Tectonic sheets continental shelf depositional environment fold and thrust belt fold belt gneiss mineralogy Proterozoic seafloor sedimentary structure stratigraphy tectonic evolution texture ultramafic rock Brazil Minas Gerais Canastra |
topic |
Araxá Group Bambuí Group Brasília fold-thrust belt Tectonic sheets continental shelf depositional environment fold and thrust belt fold belt gneiss mineralogy Proterozoic seafloor sedimentary structure stratigraphy tectonic evolution texture ultramafic rock Brazil Minas Gerais Canastra |
description |
This work aimed at describing the Neoproterozoic evolution of a Southern Brasília Fold Belt segment, in Tapira area (southwest of Minas Gerais state, Brazil), using detailed geologic mapping. This area, the Canastra Group type-area, has showed great tectonic and stratigraphic complexities unlike the simplicity suggested in previous works. From recognizing the main tectonic discontinuities, it was possible to subdivide the area into some domains. In the west domain, they were individualized in tectonic sheet I, marked by pelitic rocks and pelitic-graphite rocks with psammitic intercalations, and II, pelitic rocks with psammitic and mafic-ultramafic intercalations overlapped by gneisses. In the east domain, a group of three tectonic sheets was defined, in which, in the two lower tectonic sheets, pelitic and pelitic-graphite rocks with psammitic rock intercalations prevailed, which is different in metamorphic conditions. The lower tectonic sheet is marked by mineralogical associations with muscovite + chlorite + quartz ± graphite ± albite, without biotite; however, the superior one is with muscovite + quartz + garnet ± chlorite ± biotite ± chloritoid ± graphite ± albite. In the upper tectonic sheet, pelitic rocks with local contributions of psammitic and ultramafics rocks occur. In the south domain, psammitic rocks basically occur with contributions of pelitics and rudaceous rocks, where the preservation of textures and sedimentary structures is common. Rocks of the several domains are interpreted as part of a passive continental margin basin, located in the western margin of the São Francisco paleocontinent. Thus, the south domain rocks would represent the facies of proximal platform; rocks of the lower and middle tectonic sheets (east domain) and of the tectonic sheet I (west domain) are of facies distal platform; and the ones from the upper tectonic sheet (east domain) and tectonic sheet II (west domain) were acknowledged as deposited in an environment of continental shelf and/or oceanic seafoor. |
publishDate |
2012 |
dc.date.none.fl_str_mv |
2012-08-01 2014-05-27T11:26:54Z 2014-05-27T11:26:54Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.5327/Z1519-874X2012000200006 Geologia USP - Serie Cientifica, v. 12, n. 2, p. 83-98, 2012. 1519-874X http://hdl.handle.net/11449/73471 10.5327/Z1519-874X2012000200006 2-s2.0-84866336117 2-s2.0-84866336117.pdf 5234660343892450 |
url |
http://dx.doi.org/10.5327/Z1519-874X2012000200006 http://hdl.handle.net/11449/73471 |
identifier_str_mv |
Geologia USP - Serie Cientifica, v. 12, n. 2, p. 83-98, 2012. 1519-874X 10.5327/Z1519-874X2012000200006 2-s2.0-84866336117 2-s2.0-84866336117.pdf 5234660343892450 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
Geologia USP: Serie Cientifica |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
83-98 application/pdf |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808129101210320896 |