Morphology and stratigraphy of Serra Geral silicic lava flows in the northern segment of the Torres Trough, Paraná Igneous Province
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1590/2317-4889201820180087 http://hdl.handle.net/11449/176703 |
Resumo: | The impetus for this research was the enigma regarding the origin of the extensive silicic volcanic units in the Paraná-Etendeka Igneous Province. Are they rheoignimbrites, lava flows, or a combination of both? The São Joaquim silicic eruptive sequence is comprised of Palmas-Type aphyric dacites and is located in the northern segment of Torres Trough, a dissected mountainous region in southern Brazil. These dacite outcrops form plateaus and remnant hills that are scattered above a basaltic andesitic landscape. The original morphology of the silicic volcanic flows was constrained based on the internal architecture, geometry, and cyclicity of the lithofacies, in conjunction with petrographic and geochemical information. The data suggests the presence of ancient large tabular and lobate silicic lava flows (∼100 m thick and ∼10-40 km extents). No pyroclastic features were found. Eight interdigitating units were mapped. These large aspect ratios are similar to ones for basaltic flows and those of Snake River-type rhyolites, and they suggest high effusion rates and high temperatures as well as the presence of well-insulated cooled crusts. Lavas would have overflowed from long fissure vents that had created an extensive volcanic silicic surface body composed of conjugated and interdigitated flows above the north segment of the Torres Trough region. |
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Morphology and stratigraphy of Serra Geral silicic lava flows in the northern segment of the Torres Trough, Paraná Igneous ProvinceExtensive silicic lavasParaná-Etendeka Large Igneous ProvinceSerra Geral volcanismStratigraphy of Torres TroughSão Joaquim Plateau.The impetus for this research was the enigma regarding the origin of the extensive silicic volcanic units in the Paraná-Etendeka Igneous Province. Are they rheoignimbrites, lava flows, or a combination of both? The São Joaquim silicic eruptive sequence is comprised of Palmas-Type aphyric dacites and is located in the northern segment of Torres Trough, a dissected mountainous region in southern Brazil. These dacite outcrops form plateaus and remnant hills that are scattered above a basaltic andesitic landscape. The original morphology of the silicic volcanic flows was constrained based on the internal architecture, geometry, and cyclicity of the lithofacies, in conjunction with petrographic and geochemical information. The data suggests the presence of ancient large tabular and lobate silicic lava flows (∼100 m thick and ∼10-40 km extents). No pyroclastic features were found. Eight interdigitating units were mapped. These large aspect ratios are similar to ones for basaltic flows and those of Snake River-type rhyolites, and they suggest high effusion rates and high temperatures as well as the presence of well-insulated cooled crusts. Lavas would have overflowed from long fissure vents that had created an extensive volcanic silicic surface body composed of conjugated and interdigitated flows above the north segment of the Torres Trough region.Setor de Ciěncias da Terra Universidade Federal Do Paraná - UFPRServiço Geológico Do Brasil/Residěncia de Fortaleza - CPRM-REFO Departamento Nacional de Produção Mineral Do Paraná - DNPM-PRLaboratório de Análise de Minerais e Rochas (LAMIR) Departamento de Geologia Universidade Federal Do Paraná - UFPRPetrologia e Metalogenia Universidade Estadual Paulista Júlio de Mesquita Filho - UNESPPetrologia e Metalogenia Universidade Estadual Paulista Júlio de Mesquita Filho - UNESPUniversidade Federal do Paraná (UFPR)Serviço Geológico Do Brasil/Residěncia de Fortaleza - CPRM-REFOUniversidade Estadual Paulista (Unesp)Besser, Marcell LeonardVasconcellos, Eleonora Maria GouveaNardy, Antonio José Ranalli [UNESP]2018-12-11T17:22:08Z2018-12-11T17:22:08Z2018-04-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article201-219application/pdfhttp://dx.doi.org/10.1590/2317-4889201820180087Brazilian Journal of Geology, v. 48, n. 2, p. 201-219, 2018.2317-46922317-4889http://hdl.handle.net/11449/17670310.1590/2317-4889201820180087S2317-488920180002002012-s2.0-85051366609S2317-48892018000200201.pdfScopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengBrazilian Journal of Geology0,6080,608info:eu-repo/semantics/openAccess2023-10-22T06:12:26Zoai:repositorio.unesp.br:11449/176703Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462023-10-22T06:12:26Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Morphology and stratigraphy of Serra Geral silicic lava flows in the northern segment of the Torres Trough, Paraná Igneous Province |
title |
Morphology and stratigraphy of Serra Geral silicic lava flows in the northern segment of the Torres Trough, Paraná Igneous Province |
spellingShingle |
Morphology and stratigraphy of Serra Geral silicic lava flows in the northern segment of the Torres Trough, Paraná Igneous Province Besser, Marcell Leonard Extensive silicic lavas Paraná-Etendeka Large Igneous Province Serra Geral volcanism Stratigraphy of Torres Trough São Joaquim Plateau. |
title_short |
Morphology and stratigraphy of Serra Geral silicic lava flows in the northern segment of the Torres Trough, Paraná Igneous Province |
title_full |
Morphology and stratigraphy of Serra Geral silicic lava flows in the northern segment of the Torres Trough, Paraná Igneous Province |
title_fullStr |
Morphology and stratigraphy of Serra Geral silicic lava flows in the northern segment of the Torres Trough, Paraná Igneous Province |
title_full_unstemmed |
Morphology and stratigraphy of Serra Geral silicic lava flows in the northern segment of the Torres Trough, Paraná Igneous Province |
title_sort |
Morphology and stratigraphy of Serra Geral silicic lava flows in the northern segment of the Torres Trough, Paraná Igneous Province |
author |
Besser, Marcell Leonard |
author_facet |
Besser, Marcell Leonard Vasconcellos, Eleonora Maria Gouvea Nardy, Antonio José Ranalli [UNESP] |
author_role |
author |
author2 |
Vasconcellos, Eleonora Maria Gouvea Nardy, Antonio José Ranalli [UNESP] |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade Federal do Paraná (UFPR) Serviço Geológico Do Brasil/Residěncia de Fortaleza - CPRM-REFO Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Besser, Marcell Leonard Vasconcellos, Eleonora Maria Gouvea Nardy, Antonio José Ranalli [UNESP] |
dc.subject.por.fl_str_mv |
Extensive silicic lavas Paraná-Etendeka Large Igneous Province Serra Geral volcanism Stratigraphy of Torres Trough São Joaquim Plateau. |
topic |
Extensive silicic lavas Paraná-Etendeka Large Igneous Province Serra Geral volcanism Stratigraphy of Torres Trough São Joaquim Plateau. |
description |
The impetus for this research was the enigma regarding the origin of the extensive silicic volcanic units in the Paraná-Etendeka Igneous Province. Are they rheoignimbrites, lava flows, or a combination of both? The São Joaquim silicic eruptive sequence is comprised of Palmas-Type aphyric dacites and is located in the northern segment of Torres Trough, a dissected mountainous region in southern Brazil. These dacite outcrops form plateaus and remnant hills that are scattered above a basaltic andesitic landscape. The original morphology of the silicic volcanic flows was constrained based on the internal architecture, geometry, and cyclicity of the lithofacies, in conjunction with petrographic and geochemical information. The data suggests the presence of ancient large tabular and lobate silicic lava flows (∼100 m thick and ∼10-40 km extents). No pyroclastic features were found. Eight interdigitating units were mapped. These large aspect ratios are similar to ones for basaltic flows and those of Snake River-type rhyolites, and they suggest high effusion rates and high temperatures as well as the presence of well-insulated cooled crusts. Lavas would have overflowed from long fissure vents that had created an extensive volcanic silicic surface body composed of conjugated and interdigitated flows above the north segment of the Torres Trough region. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018-12-11T17:22:08Z 2018-12-11T17:22:08Z 2018-04-01 |
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/10.1590/2317-4889201820180087 Brazilian Journal of Geology, v. 48, n. 2, p. 201-219, 2018. 2317-4692 2317-4889 http://hdl.handle.net/11449/176703 10.1590/2317-4889201820180087 S2317-48892018000200201 2-s2.0-85051366609 S2317-48892018000200201.pdf |
url |
http://dx.doi.org/10.1590/2317-4889201820180087 http://hdl.handle.net/11449/176703 |
identifier_str_mv |
Brazilian Journal of Geology, v. 48, n. 2, p. 201-219, 2018. 2317-4692 2317-4889 10.1590/2317-4889201820180087 S2317-48892018000200201 2-s2.0-85051366609 S2317-48892018000200201.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Brazilian Journal of Geology 0,608 0,608 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
201-219 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_ |
1797789479089471488 |