Geologia, petrografia e litogeoquímica dos Gnaisses Porto Alegre, RS, Brasil: implicações geotectônicas

Detalhes bibliográficos
Autor(a) principal: Philipp, Ruy Paulo
Data de Publicação: 2004
Outros Autores: Campos, Roberto Sacks de
Tipo de documento: Artigo
Idioma: por
Título da fonte: Repositório Institucional da UFRGS
Texto Completo: http://hdl.handle.net/10183/22608
Resumo: The Porto Alegre gneiss is a unit composed of granodioritic to monzogranitic gneisses, with subordinate tonalitic and dioritic rocks. The unit represents the basement intruded by several granitic plutons of Neoproterozoic age. The gneisses show an elongate form of NE-SW direction, and constitute a roof pendant. They have composite banding, which results of injection of dioritic and tonalitic melts, followed by a regional metamorphic event of medium to high grade. Three deformational phases are registered in the gneisses, the latest has a mylonitic nature. Their geochemical features are of medium to high-K, slightly peraluminous granodiorites of calc-alkaline affinity. Comparing the Porto Alegre gneisses with metagranitoids of Pinheiro Machado complex, there are several differences, such as the lower values of Al2O3, Na2O and Sr, and higher values of FeO, MgO, MnO and Rb in the former. These differences indicate that there is no correlation between the Porto Alegre gneisses and Pinheiro Machado complex.
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spelling Philipp, Ruy PauloCampos, Roberto Sacks de2010-05-20T04:16:20Z20041518-2398http://hdl.handle.net/10183/22608000501373The Porto Alegre gneiss is a unit composed of granodioritic to monzogranitic gneisses, with subordinate tonalitic and dioritic rocks. The unit represents the basement intruded by several granitic plutons of Neoproterozoic age. The gneisses show an elongate form of NE-SW direction, and constitute a roof pendant. They have composite banding, which results of injection of dioritic and tonalitic melts, followed by a regional metamorphic event of medium to high grade. Three deformational phases are registered in the gneisses, the latest has a mylonitic nature. Their geochemical features are of medium to high-K, slightly peraluminous granodiorites of calc-alkaline affinity. Comparing the Porto Alegre gneisses with metagranitoids of Pinheiro Machado complex, there are several differences, such as the lower values of Al2O3, Na2O and Sr, and higher values of FeO, MgO, MnO and Rb in the former. These differences indicate that there is no correlation between the Porto Alegre gneisses and Pinheiro Machado complex.application/pdfporPesquisas em Geociências. Porto Alegre, RS. Vol. 31, n. 2 (2004), p. 79-94Gnaisses : Porto Alegre (RS)OrthogneissGranodioritesPaleoproterozoicDom Feliciano BeltGeologia, petrografia e litogeoquímica dos Gnaisses Porto Alegre, RS, Brasil: implicações geotectônicasinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/otherinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSTEXT000501373.pdf.txt000501373.pdf.txtExtracted Texttext/plain39381http://www.lume.ufrgs.br/bitstream/10183/22608/2/000501373.pdf.txtb19e298c29838076c54df6ee14de5624MD52ORIGINAL000501373.pdf000501373.pdfTexto completoapplication/pdf575489http://www.lume.ufrgs.br/bitstream/10183/22608/1/000501373.pdfcb3bc215f47c70da765271d99c2c7975MD51THUMBNAIL000501373.pdf.jpg000501373.pdf.jpgGenerated Thumbnailimage/jpeg1575http://www.lume.ufrgs.br/bitstream/10183/22608/3/000501373.pdf.jpgfe193c89c680bfd02ead1ad31b65aca0MD5310183/226082018-10-08 07:53:56.213oai:www.lume.ufrgs.br:10183/22608Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2018-10-08T10:53:56Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv Geologia, petrografia e litogeoquímica dos Gnaisses Porto Alegre, RS, Brasil: implicações geotectônicas
title Geologia, petrografia e litogeoquímica dos Gnaisses Porto Alegre, RS, Brasil: implicações geotectônicas
spellingShingle Geologia, petrografia e litogeoquímica dos Gnaisses Porto Alegre, RS, Brasil: implicações geotectônicas
Philipp, Ruy Paulo
Gnaisses : Porto Alegre (RS)
Orthogneiss
Granodiorites
Paleoproterozoic
Dom Feliciano Belt
title_short Geologia, petrografia e litogeoquímica dos Gnaisses Porto Alegre, RS, Brasil: implicações geotectônicas
title_full Geologia, petrografia e litogeoquímica dos Gnaisses Porto Alegre, RS, Brasil: implicações geotectônicas
title_fullStr Geologia, petrografia e litogeoquímica dos Gnaisses Porto Alegre, RS, Brasil: implicações geotectônicas
title_full_unstemmed Geologia, petrografia e litogeoquímica dos Gnaisses Porto Alegre, RS, Brasil: implicações geotectônicas
title_sort Geologia, petrografia e litogeoquímica dos Gnaisses Porto Alegre, RS, Brasil: implicações geotectônicas
author Philipp, Ruy Paulo
author_facet Philipp, Ruy Paulo
Campos, Roberto Sacks de
author_role author
author2 Campos, Roberto Sacks de
author2_role author
dc.contributor.author.fl_str_mv Philipp, Ruy Paulo
Campos, Roberto Sacks de
dc.subject.por.fl_str_mv Gnaisses : Porto Alegre (RS)
topic Gnaisses : Porto Alegre (RS)
Orthogneiss
Granodiorites
Paleoproterozoic
Dom Feliciano Belt
dc.subject.eng.fl_str_mv Orthogneiss
Granodiorites
Paleoproterozoic
Dom Feliciano Belt
description The Porto Alegre gneiss is a unit composed of granodioritic to monzogranitic gneisses, with subordinate tonalitic and dioritic rocks. The unit represents the basement intruded by several granitic plutons of Neoproterozoic age. The gneisses show an elongate form of NE-SW direction, and constitute a roof pendant. They have composite banding, which results of injection of dioritic and tonalitic melts, followed by a regional metamorphic event of medium to high grade. Three deformational phases are registered in the gneisses, the latest has a mylonitic nature. Their geochemical features are of medium to high-K, slightly peraluminous granodiorites of calc-alkaline affinity. Comparing the Porto Alegre gneisses with metagranitoids of Pinheiro Machado complex, there are several differences, such as the lower values of Al2O3, Na2O and Sr, and higher values of FeO, MgO, MnO and Rb in the former. These differences indicate that there is no correlation between the Porto Alegre gneisses and Pinheiro Machado complex.
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dc.relation.ispartof.pt_BR.fl_str_mv Pesquisas em Geociências. Porto Alegre, RS. Vol. 31, n. 2 (2004), p. 79-94
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