The Vieira river debris flow in Teresópolis, southeastern Brazil: characterization of the source area of the transported sediments

Detalhes bibliográficos
Autor(a) principal: Rodrigues, Juliana
Data de Publicação: 2012
Outros Autores: Tupinambá, Miguel, Amaral, Cláudio
Tipo de documento: Artigo
Idioma: por
Título da fonte: Anuário do Instituto de Geociências (Online)
Texto Completo: https://revistas.ufrj.br/index.php/aigeo/article/view/6944
Resumo: This work has presents the geology of the bedrock and the sedimentary deposits of the upper course of the Vieira river where a debris flow killed 23 people on January 2011. The upper course of rio Vieira has drawn a straight line and is embedded in a N25E trending fracture and fault system. Over the almost 2 km of exposed bedrock, there is a predominance of gneissic Cordeiro and Serra dos Órgãos suites. The granite of the Nova Friburgo suite occurs only in the river head and in a narrow strip in the middle section of the channel. Three types of sedimentary remnants were observed: a) talus deposit with granite boulders in the river head; b) gneissic rock fall deposits near the the channel walls; c) granite boulders and gneissic blocks in the floodplain. The presence of granite boulders at the head and the scarcity of the granite in the bedrock indicates that the bulk transported solids comes from the erosion of talus deposits in the headwaters of the river. The blocks of gneiss comes from rock-fall deposits along the channel walls.
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spelling The Vieira river debris flow in Teresópolis, southeastern Brazil: characterization of the source area of the transported sedimentsA corrida de massa do rio Vieira em Teresópolis, sudeste do Brasil: caracterização da área-fonte dos sedimentos transportadosThis work has presents the geology of the bedrock and the sedimentary deposits of the upper course of the Vieira river where a debris flow killed 23 people on January 2011. The upper course of rio Vieira has drawn a straight line and is embedded in a N25E trending fracture and fault system. Over the almost 2 km of exposed bedrock, there is a predominance of gneissic Cordeiro and Serra dos Órgãos suites. The granite of the Nova Friburgo suite occurs only in the river head and in a narrow strip in the middle section of the channel. Three types of sedimentary remnants were observed: a) talus deposit with granite boulders in the river head; b) gneissic rock fall deposits near the the channel walls; c) granite boulders and gneissic blocks in the floodplain. The presence of granite boulders at the head and the scarcity of the granite in the bedrock indicates that the bulk transported solids comes from the erosion of talus deposits in the headwaters of the river. The blocks of gneiss comes from rock-fall deposits along the channel walls.Nesse trabalho foi caracterizado o substrato rochoso e os depósitos sedimentares do alto curso do rio Vieira, cenário de uma das corridas de massa ocorridas na região Serrana do Estado do Rio de Janeiro durante um Megadesastre em janeiro de 2011. O alto curso do rio Vieira apresenta traçado retilíneo e está encaixado em um sistema de fraturas e falhas de direção N25E. Ao longo dos quase 2 km de leito rochoso expostos,verificou-se a predominância de gnaisses das suítes Cordeiro e Serra dos Órgãos. O granito da Suíte Nova Friburgo se restringe à cabeceira de drenagem e a uma estreita faixa no trecho médio do canal. Três tipos de depósitos sedimentares remanescentes foram observados. Na região da cabeceira ocorrem depósitos de tálus constituídos predominantemente por matacões graníticos. Nas paredes do canal retilíneo encontram-se depósitos de queda de blocos gnáissicos. Na frente da corrida, dispostos sobre a planície aluvionar, ocorrem matacões graníticos e blocos gnáissicos. A presença de matacões de granito na cabeceira e a escassez de granito no leito rochoso indica que o maior volume de sólidos transportado é proveniente da erosão dos depósitos de tálus situados na cabeceira do rio. Os blocos de gnaisse são provenientes dos depósitos de queda de blocos presentes nas paredes do canal.Universidade Federal do Rio de Janeiro2012-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://revistas.ufrj.br/index.php/aigeo/article/view/694410.11137/2012_2_152_164Anuário do Instituto de Geociências; Vol 35, No 2 (2012); 152-164Anuário do Instituto de Geociências; Vol 35, No 2 (2012); 152-1641982-39080101-9759reponame:Anuário do Instituto de Geociências (Online)instname:Universidade Federal do Rio de Janeiro (UFRJ)instacron:UFRJporhttps://revistas.ufrj.br/index.php/aigeo/article/view/6944/5511Copyright (c) 2012 Anuário do Instituto de Geociênciashttp://creativecommons.org/licenses/by/4.0info:eu-repo/semantics/openAccessRodrigues, JulianaTupinambá, MiguelAmaral, Cláudio2017-01-23T22:34:48Zoai:www.revistas.ufrj.br:article/6944Revistahttps://revistas.ufrj.br/index.php/aigeo/indexPUBhttps://revistas.ufrj.br/index.php/aigeo/oaianuario@igeo.ufrj.br||1982-39080101-9759opendoar:2017-01-23T22:34:48Anuário do Instituto de Geociências (Online) - Universidade Federal do Rio de Janeiro (UFRJ)false
dc.title.none.fl_str_mv The Vieira river debris flow in Teresópolis, southeastern Brazil: characterization of the source area of the transported sediments
A corrida de massa do rio Vieira em Teresópolis, sudeste do Brasil: caracterização da área-fonte dos sedimentos transportados
title The Vieira river debris flow in Teresópolis, southeastern Brazil: characterization of the source area of the transported sediments
spellingShingle The Vieira river debris flow in Teresópolis, southeastern Brazil: characterization of the source area of the transported sediments
Rodrigues, Juliana
title_short The Vieira river debris flow in Teresópolis, southeastern Brazil: characterization of the source area of the transported sediments
title_full The Vieira river debris flow in Teresópolis, southeastern Brazil: characterization of the source area of the transported sediments
title_fullStr The Vieira river debris flow in Teresópolis, southeastern Brazil: characterization of the source area of the transported sediments
title_full_unstemmed The Vieira river debris flow in Teresópolis, southeastern Brazil: characterization of the source area of the transported sediments
title_sort The Vieira river debris flow in Teresópolis, southeastern Brazil: characterization of the source area of the transported sediments
author Rodrigues, Juliana
author_facet Rodrigues, Juliana
Tupinambá, Miguel
Amaral, Cláudio
author_role author
author2 Tupinambá, Miguel
Amaral, Cláudio
author2_role author
author
dc.contributor.author.fl_str_mv Rodrigues, Juliana
Tupinambá, Miguel
Amaral, Cláudio
description This work has presents the geology of the bedrock and the sedimentary deposits of the upper course of the Vieira river where a debris flow killed 23 people on January 2011. The upper course of rio Vieira has drawn a straight line and is embedded in a N25E trending fracture and fault system. Over the almost 2 km of exposed bedrock, there is a predominance of gneissic Cordeiro and Serra dos Órgãos suites. The granite of the Nova Friburgo suite occurs only in the river head and in a narrow strip in the middle section of the channel. Three types of sedimentary remnants were observed: a) talus deposit with granite boulders in the river head; b) gneissic rock fall deposits near the the channel walls; c) granite boulders and gneissic blocks in the floodplain. The presence of granite boulders at the head and the scarcity of the granite in the bedrock indicates that the bulk transported solids comes from the erosion of talus deposits in the headwaters of the river. The blocks of gneiss comes from rock-fall deposits along the channel walls.
publishDate 2012
dc.date.none.fl_str_mv 2012-12-01
dc.type.none.fl_str_mv
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://revistas.ufrj.br/index.php/aigeo/article/view/6944
10.11137/2012_2_152_164
url https://revistas.ufrj.br/index.php/aigeo/article/view/6944
identifier_str_mv 10.11137/2012_2_152_164
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv https://revistas.ufrj.br/index.php/aigeo/article/view/6944/5511
dc.rights.driver.fl_str_mv Copyright (c) 2012 Anuário do Instituto de Geociências
http://creativecommons.org/licenses/by/4.0
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Copyright (c) 2012 Anuário do Instituto de Geociências
http://creativecommons.org/licenses/by/4.0
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidade Federal do Rio de Janeiro
publisher.none.fl_str_mv Universidade Federal do Rio de Janeiro
dc.source.none.fl_str_mv Anuário do Instituto de Geociências; Vol 35, No 2 (2012); 152-164
Anuário do Instituto de Geociências; Vol 35, No 2 (2012); 152-164
1982-3908
0101-9759
reponame:Anuário do Instituto de Geociências (Online)
instname:Universidade Federal do Rio de Janeiro (UFRJ)
instacron:UFRJ
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reponame_str Anuário do Instituto de Geociências (Online)
collection Anuário do Instituto de Geociências (Online)
repository.name.fl_str_mv Anuário do Instituto de Geociências (Online) - Universidade Federal do Rio de Janeiro (UFRJ)
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