Characterization of volcanic structures associated to the silicic magmatism of the Paraná-Etendeka Province, in the Aparados da Serra region, southern Brazil
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/220249 |
Resumo: | The Paraná-Etendeka Magmatic Province is associated with the distensive tectonics that caused the rupture of the Gondwana continent during the Lower Cretaceous and generated an intense volcanism that covers South America and the NW portion of Namibia in Africa. In Brazil, this volcanic sequence is named Serra Geral Group and predominantly consists of basalts and subordinated silicic rocks. The goal of this study is to characterize the geomorphological features observed in the Aparados da Serra region, southern Brazil, and to evaluate the relationship between these structures and the primary silicic volcanic structures. The geomorphological features were fi rst identifi ed using remote sensing and then correlated with fl ow structures observed in the fi eld, as well as petrographic and geochemical data. AMS data were used to determine magnetic patterns and the direction of magmatic fl ow of the rocks. Despite the low degree of anisotropy, clear patterns of lineation and foliation were identifi ed in the studied rocks. Our data shows that Units I and II correspond to silicic lava fl ows linked to effusive fi ssure eruptions, presenting a dome morphology caused by differential erosion. Unit III rocks may correspond to true volcanic domes, whereas the Unit IV corresponds to the effusive feeder structures. |
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Benites, SusanaSommer, Carlos AugustoLima, Evandro Fernandes deSavian, Jairo FranciscoHaag, Maurício BarcelosMoncinhatto, Thiago RibasTrindade, Ricardo Ivan Ferreira da2021-04-27T04:33:56Z20200001-3765http://hdl.handle.net/10183/220249001123520The Paraná-Etendeka Magmatic Province is associated with the distensive tectonics that caused the rupture of the Gondwana continent during the Lower Cretaceous and generated an intense volcanism that covers South America and the NW portion of Namibia in Africa. In Brazil, this volcanic sequence is named Serra Geral Group and predominantly consists of basalts and subordinated silicic rocks. The goal of this study is to characterize the geomorphological features observed in the Aparados da Serra region, southern Brazil, and to evaluate the relationship between these structures and the primary silicic volcanic structures. The geomorphological features were fi rst identifi ed using remote sensing and then correlated with fl ow structures observed in the fi eld, as well as petrographic and geochemical data. AMS data were used to determine magnetic patterns and the direction of magmatic fl ow of the rocks. Despite the low degree of anisotropy, clear patterns of lineation and foliation were identifi ed in the studied rocks. Our data shows that Units I and II correspond to silicic lava fl ows linked to effusive fi ssure eruptions, presenting a dome morphology caused by differential erosion. Unit III rocks may correspond to true volcanic domes, whereas the Unit IV corresponds to the effusive feeder structures.application/pdfengAnais da Academia Brasileira de Ciências. Vol. 92, n. 2 (Mar. 2020), e20180981Processamento de imagensSensoriamento remoto : GeologiaAnisotropy of magnetic susceptibilitySilicic lavasVolcanic morphologiesCharacterization of volcanic structures associated to the silicic magmatism of the Paraná-Etendeka Province, in the Aparados da Serra region, southern BrazilEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSTEXT001123520.pdf.txt001123520.pdf.txtExtracted Texttext/plain0http://www.lume.ufrgs.br/bitstream/10183/220249/2/001123520.pdf.txtd41d8cd98f00b204e9800998ecf8427eMD52ORIGINAL001123520.pdfTexto completo (inglês)application/pdf8641295http://www.lume.ufrgs.br/bitstream/10183/220249/1/001123520.pdf12b2b3da259a61f38ccbf81e6ee9dbe9MD5110183/2202492021-11-20 05:54:41.451583oai:www.lume.ufrgs.br:10183/220249Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2021-11-20T07:54:41Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Characterization of volcanic structures associated to the silicic magmatism of the Paraná-Etendeka Province, in the Aparados da Serra region, southern Brazil |
title |
Characterization of volcanic structures associated to the silicic magmatism of the Paraná-Etendeka Province, in the Aparados da Serra region, southern Brazil |
spellingShingle |
Characterization of volcanic structures associated to the silicic magmatism of the Paraná-Etendeka Province, in the Aparados da Serra region, southern Brazil Benites, Susana Processamento de imagens Sensoriamento remoto : Geologia Anisotropy of magnetic susceptibility Silicic lavas Volcanic morphologies |
title_short |
Characterization of volcanic structures associated to the silicic magmatism of the Paraná-Etendeka Province, in the Aparados da Serra region, southern Brazil |
title_full |
Characterization of volcanic structures associated to the silicic magmatism of the Paraná-Etendeka Province, in the Aparados da Serra region, southern Brazil |
title_fullStr |
Characterization of volcanic structures associated to the silicic magmatism of the Paraná-Etendeka Province, in the Aparados da Serra region, southern Brazil |
title_full_unstemmed |
Characterization of volcanic structures associated to the silicic magmatism of the Paraná-Etendeka Province, in the Aparados da Serra region, southern Brazil |
title_sort |
Characterization of volcanic structures associated to the silicic magmatism of the Paraná-Etendeka Province, in the Aparados da Serra region, southern Brazil |
author |
Benites, Susana |
author_facet |
Benites, Susana Sommer, Carlos Augusto Lima, Evandro Fernandes de Savian, Jairo Francisco Haag, Maurício Barcelos Moncinhatto, Thiago Ribas Trindade, Ricardo Ivan Ferreira da |
author_role |
author |
author2 |
Sommer, Carlos Augusto Lima, Evandro Fernandes de Savian, Jairo Francisco Haag, Maurício Barcelos Moncinhatto, Thiago Ribas Trindade, Ricardo Ivan Ferreira da |
author2_role |
author author author author author author |
dc.contributor.author.fl_str_mv |
Benites, Susana Sommer, Carlos Augusto Lima, Evandro Fernandes de Savian, Jairo Francisco Haag, Maurício Barcelos Moncinhatto, Thiago Ribas Trindade, Ricardo Ivan Ferreira da |
dc.subject.por.fl_str_mv |
Processamento de imagens Sensoriamento remoto : Geologia |
topic |
Processamento de imagens Sensoriamento remoto : Geologia Anisotropy of magnetic susceptibility Silicic lavas Volcanic morphologies |
dc.subject.eng.fl_str_mv |
Anisotropy of magnetic susceptibility Silicic lavas Volcanic morphologies |
description |
The Paraná-Etendeka Magmatic Province is associated with the distensive tectonics that caused the rupture of the Gondwana continent during the Lower Cretaceous and generated an intense volcanism that covers South America and the NW portion of Namibia in Africa. In Brazil, this volcanic sequence is named Serra Geral Group and predominantly consists of basalts and subordinated silicic rocks. The goal of this study is to characterize the geomorphological features observed in the Aparados da Serra region, southern Brazil, and to evaluate the relationship between these structures and the primary silicic volcanic structures. The geomorphological features were fi rst identifi ed using remote sensing and then correlated with fl ow structures observed in the fi eld, as well as petrographic and geochemical data. AMS data were used to determine magnetic patterns and the direction of magmatic fl ow of the rocks. Despite the low degree of anisotropy, clear patterns of lineation and foliation were identifi ed in the studied rocks. Our data shows that Units I and II correspond to silicic lava fl ows linked to effusive fi ssure eruptions, presenting a dome morphology caused by differential erosion. Unit III rocks may correspond to true volcanic domes, whereas the Unit IV corresponds to the effusive feeder structures. |
publishDate |
2020 |
dc.date.issued.fl_str_mv |
2020 |
dc.date.accessioned.fl_str_mv |
2021-04-27T04:33:56Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
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publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/220249 |
dc.identifier.issn.pt_BR.fl_str_mv |
0001-3765 |
dc.identifier.nrb.pt_BR.fl_str_mv |
001123520 |
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0001-3765 001123520 |
url |
http://hdl.handle.net/10183/220249 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Anais da Academia Brasileira de Ciências. Vol. 92, n. 2 (Mar. 2020), e20180981 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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application/pdf |
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