Tectônica de emplacement dos diques toleíticos do Arco de Ponta Grossa, entre Curitiba e Paranaguá (PR)
Autor(a) principal: | |
---|---|
Data de Publicação: | 2014 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Biblioteca Digital de Teses e Dissertações da UERJ |
Texto Completo: | http://www.bdtd.uerj.br/handle/1/7095 |
Resumo: | Despite the large amount of geochemical and geochronological studies that have been performed in the Ponta Grossa dyke swarm (EDPG), little is known about the associated tectonics with their sin and post emplacement. The objective of this study is to identify at the dykes, possibles kinematic indicators to understand this dynamic and characterize the Meso-Cenozoic brittle tectonic associated with the area, affecting all rocks. The study area is located in the vicinity of Paranagua bay, Parana state, where the EDPG dykes arise intruding Precambrian domains, composed of gneisses, metasedimentary sequences and granite suites that belongs to the Paranaguá terrane and a small part to Curitiba and Luis Alves microplates, both in touch by a shear zone (SIGA JR, 1995). These rocks have an outstanding NE-SW foliation direction. The studied dykes were divided into two groups based on petrographic studies with a strong predominance of tholeiitic basics and subordinate, alkali basic. Some compounds dykes were found, what demonstrates that at least two magmatic pulses possibly associated with the same event. Dykes are vertical to subvertical and have a NW-SE main direction. Often have a NE-SW direction to internal fracturing, probably associated with its cooling process. The dykes have a tabular format, but is not uncommon occurring irregular. The main indicative features of oblique movement in these dyke intrusions are stepped edge structures, branchs and zigzag shapes, which demonstrate in general a extensional dextral component of displacement. Aggregating data from other major tholeiitic dykes swarms, was found an average value of N80E for the σ3 tensor for th opening of South Atlantic, consistent with the expected for the EDPG also, since they were intruded into a transtensive regime (CORREA GOMES, 1996). Faults and fractures are observed cutting both the host rocks as dikes, featuring a later intrusion tectonics. The main fracture sets are N20-30E, N30-40W, N80W and N60-70E, forming preferencial areas of erosion at the intersection between them. Faults can display well-defined fault planes with striation and steps, occurring fulfilled or not, by silica and carbonatic material. In the observed faults predominates sinistral kinematic, indicating change in the stress field in comparison to the emplacement dykes one. The study of th brittle tectonics as the dykes emplacement in the area contribute to a better understanding of the process of South Atlantic ocean opening, besides covering the submerged region of the Santos Basin basement, the focus of extensive studies currently, assuming that the same processes have affected the offshore region. |
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Almeida, Julio Cesar Horta dehttp://lattes.cnpq.br/0537716520189598Duarte, Beatriz Paschoalhttp://lattes.cnpq.br/0001020653445095Magnavita, Luciano Portugalhttp://lattes.cnpq.br/2802339593427937http://lattes.cnpq.br/2523149069773569Souza, Débora Marinho de2021-01-05T15:34:56Z2014-03-172014-08-30SOUZA, Débora Marinho de. Tectônica de emplacement dos diques toleíticos do Arco de Ponta Grossa, entre Curitiba e Paranaguá (PR). 2014. 98 f. Dissertação (Mestrado em Análise de Bacias;Tectônia, Petrologia e Recursos Minerais) - Universidade do Estado do Rio de Janeiro, Rio de Janeiro, 2014.http://www.bdtd.uerj.br/handle/1/7095Despite the large amount of geochemical and geochronological studies that have been performed in the Ponta Grossa dyke swarm (EDPG), little is known about the associated tectonics with their sin and post emplacement. The objective of this study is to identify at the dykes, possibles kinematic indicators to understand this dynamic and characterize the Meso-Cenozoic brittle tectonic associated with the area, affecting all rocks. The study area is located in the vicinity of Paranagua bay, Parana state, where the EDPG dykes arise intruding Precambrian domains, composed of gneisses, metasedimentary sequences and granite suites that belongs to the Paranaguá terrane and a small part to Curitiba and Luis Alves microplates, both in touch by a shear zone (SIGA JR, 1995). These rocks have an outstanding NE-SW foliation direction. The studied dykes were divided into two groups based on petrographic studies with a strong predominance of tholeiitic basics and subordinate, alkali basic. Some compounds dykes were found, what demonstrates that at least two magmatic pulses possibly associated with the same event. Dykes are vertical to subvertical and have a NW-SE main direction. Often have a NE-SW direction to internal fracturing, probably associated with its cooling process. The dykes have a tabular format, but is not uncommon occurring irregular. The main indicative features of oblique movement in these dyke intrusions are stepped edge structures, branchs and zigzag shapes, which demonstrate in general a extensional dextral component of displacement. Aggregating data from other major tholeiitic dykes swarms, was found an average value of N80E for the σ3 tensor for th opening of South Atlantic, consistent with the expected for the EDPG also, since they were intruded into a transtensive regime (CORREA GOMES, 1996). Faults and fractures are observed cutting both the host rocks as dikes, featuring a later intrusion tectonics. The main fracture sets are N20-30E, N30-40W, N80W and N60-70E, forming preferencial areas of erosion at the intersection between them. Faults can display well-defined fault planes with striation and steps, occurring fulfilled or not, by silica and carbonatic material. In the observed faults predominates sinistral kinematic, indicating change in the stress field in comparison to the emplacement dykes one. The study of th brittle tectonics as the dykes emplacement in the area contribute to a better understanding of the process of South Atlantic ocean opening, besides covering the submerged region of the Santos Basin basement, the focus of extensive studies currently, assuming that the same processes have affected the offshore region.Apesar da grande quantidade de estudos geoquímicos e geocronológicos que têm sido executados no enxame de diques de Ponta Grossa (EDPG), pouco se sabe a respeito da tectônica associada ao seu sin e pós emplacement . O objetivo desse estudo é identificar nos diques possíveis indicadores cinemáticos a fim de compreender essa dinâmica, além de caracterizar a tectônica rúptil Meso-cenozóica associada à área, afetando todas as rochas. A área de estudo está situada no entorno da Baía de Paranaguá, estado do Paraná, onde os diques do EDPG afloram intrudindo domínios pré-cambrianos, compostos por gnaisses, sequências metassedimentares e suítes graníticas pertencentes ao Terreno Paranaguá e uma pequena parte às Microplacas Curitiba e Luís Alves, ambos em contato através de Zonas de cisalhamento (SIGA JR, 1995). Essas rochas possuem direção de foliação marcante NE-SW. Os diques estudados foram divididos em dois grupos com base em estudos petrográficos, com forte predomínio dos básicos toleíticos e subordinadamente, os básicos alcalinos. Alguns diques compostos também foram encontrados, o que demonstra ao menos dois pulsos magmáticos possivelmente associados ao mesmo evento. São diques verticais a subverticais e possuem direção principal NW-SE. Com frequência apresentam fraturamento interno de direção NE-SW, provavelmente associados ao seu processo de resfriamento. Possuem formato tabular, porém não é raro que ocorram irregulares. As principais feições indicativas de movimentação oblíqua na intrusão desses diques são as estruturas de borda em degraus, tocos e zigue-zague, que demonstram em geral uma componente distensional destral de deslocamento. Agregando dados dos demais enxames de diques toleíticos principais, chegou-se a um valor médio de N80E para o tensor σ3 da abertura do Atlântico Sul, coerente com o esperado também para EDPG, visto que foram intrudidos em um ambiente transtensivo (CORREA GOMES, 1996). Falhas e fraturas são observadas cortando tanto as rochas encaixantes quanto os diques, caracterizando uma tectônica posterior à intrusão. As principais famílias de fraturas são N20-30E, N30-40W, N80W e N60-70E, formando zonas preferenciais de erosão no cruzamento entre elas. As falhas podem apresentar plano de falha bem definido com estrias e ressaltos, ocorrendo preenchidas ou não, tendo sido observados preenchimento de sílica e material carbonático. Predomina nas falhas observadas, cinemática sinistral demonstrando mudança no campo de esforços com relação ao emplacement dos diques. O estudo da tectônica rúptil assim como do emplacement dos diques da área vem a contribuir para o melhor entendimento dos processos de abertura do Oceano Atlântico Sul, além de abranger a região emersa do que constitui o embasamento da bacia de Santos, foco de extensivos estudos atualmente, podendo-se inferir que os mesmos processos tenham afetado a região offshore.Submitted by Boris Flegr (boris@uerj.br) on 2021-01-05T15:34:56Z No. of bitstreams: 10 Pre textuais Introducao e Pt 1 a 3.pdf: 2960864 bytes, checksum: 8492295bd4cb54db4a9fbf8491c3aa98 (MD5) Pt 4 A.pdf: 3029984 bytes, checksum: 9f766eb1d575cdb8a4ab928e9d6ea2ac (MD5) Pt 4 B.pdf: 2421853 bytes, checksum: dbee5043bc916767998685bafeaa4559 (MD5) Pt 4 C.pdf: 2857003 bytes, checksum: 81cf1d1703066249e25e0420bb4ea54a (MD5) Pt 5 A.pdf: 2277160 bytes, checksum: eb50d1719373506a2923fc27ab63ffa5 (MD5) Pt 5 B.pdf: 3128470 bytes, checksum: a4a095ad311f88bfd241113b6439ea0b (MD5) Pt 5 C.pdf: 1201337 bytes, checksum: 53260f51215ec5a9d69a0c97aa56480d (MD5) Pt 6 A.pdf: 3158526 bytes, checksum: fbb7300ab1c029418dc0bc0cee877e72 (MD5) Pt 6 B.pdf: 3170714 bytes, checksum: 1bc8b819aa93e8c415191878bf3f5ccb (MD5) Pt 7 Conclusao Referencias e Apendices.pdf: 819760 bytes, checksum: 244b78b590956a1f8b69e744226a9674 (MD5)Made available in DSpace on 2021-01-05T15:34:56Z (GMT). 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dc.title.por.fl_str_mv |
Tectônica de emplacement dos diques toleíticos do Arco de Ponta Grossa, entre Curitiba e Paranaguá (PR) |
dc.title.alternative.eng.fl_str_mv |
Emplacement tectonics of the Ponta Grossa tholeitic dyke swarm, located between Curitiba and Paranaguá (PR) |
title |
Tectônica de emplacement dos diques toleíticos do Arco de Ponta Grossa, entre Curitiba e Paranaguá (PR) |
spellingShingle |
Tectônica de emplacement dos diques toleíticos do Arco de Ponta Grossa, entre Curitiba e Paranaguá (PR) Souza, Débora Marinho de Emplacement tectonics Tholeitic dykes Ponta Grossa Arch South Atlantic rift Tectônica de emplacement Diques toleíticos Arco de Ponta Grossa Rifte Sul Atlântico CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOLOGIA::GEOLOGIA REGIONAL |
title_short |
Tectônica de emplacement dos diques toleíticos do Arco de Ponta Grossa, entre Curitiba e Paranaguá (PR) |
title_full |
Tectônica de emplacement dos diques toleíticos do Arco de Ponta Grossa, entre Curitiba e Paranaguá (PR) |
title_fullStr |
Tectônica de emplacement dos diques toleíticos do Arco de Ponta Grossa, entre Curitiba e Paranaguá (PR) |
title_full_unstemmed |
Tectônica de emplacement dos diques toleíticos do Arco de Ponta Grossa, entre Curitiba e Paranaguá (PR) |
title_sort |
Tectônica de emplacement dos diques toleíticos do Arco de Ponta Grossa, entre Curitiba e Paranaguá (PR) |
author |
Souza, Débora Marinho de |
author_facet |
Souza, Débora Marinho de |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Almeida, Julio Cesar Horta de |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/0537716520189598 |
dc.contributor.referee1.fl_str_mv |
Duarte, Beatriz Paschoal |
dc.contributor.referee1Lattes.fl_str_mv |
http://lattes.cnpq.br/0001020653445095 |
dc.contributor.referee2.fl_str_mv |
Magnavita, Luciano Portugal |
dc.contributor.referee2Lattes.fl_str_mv |
http://lattes.cnpq.br/2802339593427937 |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/2523149069773569 |
dc.contributor.author.fl_str_mv |
Souza, Débora Marinho de |
contributor_str_mv |
Almeida, Julio Cesar Horta de Duarte, Beatriz Paschoal Magnavita, Luciano Portugal |
dc.subject.eng.fl_str_mv |
Emplacement tectonics Tholeitic dykes Ponta Grossa Arch South Atlantic rift |
topic |
Emplacement tectonics Tholeitic dykes Ponta Grossa Arch South Atlantic rift Tectônica de emplacement Diques toleíticos Arco de Ponta Grossa Rifte Sul Atlântico CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOLOGIA::GEOLOGIA REGIONAL |
dc.subject.por.fl_str_mv |
Tectônica de emplacement Diques toleíticos Arco de Ponta Grossa Rifte Sul Atlântico |
dc.subject.cnpq.fl_str_mv |
CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOLOGIA::GEOLOGIA REGIONAL |
description |
Despite the large amount of geochemical and geochronological studies that have been performed in the Ponta Grossa dyke swarm (EDPG), little is known about the associated tectonics with their sin and post emplacement. The objective of this study is to identify at the dykes, possibles kinematic indicators to understand this dynamic and characterize the Meso-Cenozoic brittle tectonic associated with the area, affecting all rocks. The study area is located in the vicinity of Paranagua bay, Parana state, where the EDPG dykes arise intruding Precambrian domains, composed of gneisses, metasedimentary sequences and granite suites that belongs to the Paranaguá terrane and a small part to Curitiba and Luis Alves microplates, both in touch by a shear zone (SIGA JR, 1995). These rocks have an outstanding NE-SW foliation direction. The studied dykes were divided into two groups based on petrographic studies with a strong predominance of tholeiitic basics and subordinate, alkali basic. Some compounds dykes were found, what demonstrates that at least two magmatic pulses possibly associated with the same event. Dykes are vertical to subvertical and have a NW-SE main direction. Often have a NE-SW direction to internal fracturing, probably associated with its cooling process. The dykes have a tabular format, but is not uncommon occurring irregular. The main indicative features of oblique movement in these dyke intrusions are stepped edge structures, branchs and zigzag shapes, which demonstrate in general a extensional dextral component of displacement. Aggregating data from other major tholeiitic dykes swarms, was found an average value of N80E for the σ3 tensor for th opening of South Atlantic, consistent with the expected for the EDPG also, since they were intruded into a transtensive regime (CORREA GOMES, 1996). Faults and fractures are observed cutting both the host rocks as dikes, featuring a later intrusion tectonics. The main fracture sets are N20-30E, N30-40W, N80W and N60-70E, forming preferencial areas of erosion at the intersection between them. Faults can display well-defined fault planes with striation and steps, occurring fulfilled or not, by silica and carbonatic material. In the observed faults predominates sinistral kinematic, indicating change in the stress field in comparison to the emplacement dykes one. The study of th brittle tectonics as the dykes emplacement in the area contribute to a better understanding of the process of South Atlantic ocean opening, besides covering the submerged region of the Santos Basin basement, the focus of extensive studies currently, assuming that the same processes have affected the offshore region. |
publishDate |
2014 |
dc.date.available.fl_str_mv |
2014-03-17 |
dc.date.issued.fl_str_mv |
2014-08-30 |
dc.date.accessioned.fl_str_mv |
2021-01-05T15:34:56Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
SOUZA, Débora Marinho de. Tectônica de emplacement dos diques toleíticos do Arco de Ponta Grossa, entre Curitiba e Paranaguá (PR). 2014. 98 f. Dissertação (Mestrado em Análise de Bacias;Tectônia, Petrologia e Recursos Minerais) - Universidade do Estado do Rio de Janeiro, Rio de Janeiro, 2014. |
dc.identifier.uri.fl_str_mv |
http://www.bdtd.uerj.br/handle/1/7095 |
identifier_str_mv |
SOUZA, Débora Marinho de. Tectônica de emplacement dos diques toleíticos do Arco de Ponta Grossa, entre Curitiba e Paranaguá (PR). 2014. 98 f. Dissertação (Mestrado em Análise de Bacias;Tectônia, Petrologia e Recursos Minerais) - Universidade do Estado do Rio de Janeiro, Rio de Janeiro, 2014. |
url |
http://www.bdtd.uerj.br/handle/1/7095 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
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openAccess |
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application/pdf |
dc.publisher.none.fl_str_mv |
Universidade do Estado do Rio de Janeiro |
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Programa de Pós-Graduação em Análise de Bacias e Faixas Móveis |
dc.publisher.initials.fl_str_mv |
UERJ |
dc.publisher.country.fl_str_mv |
BR |
dc.publisher.department.fl_str_mv |
Centro de Tecnologia e Ciências::Faculdade de Geologia |
publisher.none.fl_str_mv |
Universidade do Estado do Rio de Janeiro |
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