Análise da deformação pós-Rifte na Bacia do Araripe, Nordeste do Brasil
Autor(a) principal: | |
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Data de Publicação: | 2010 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFRN |
Texto Completo: | https://repositorio.ufrn.br/jspui/handle/123456789/18802 |
Resumo: | The Araripe Basin is located over Precambrian terrains of the Borborema Province, being part of Northeast Brazil inner basins. Its origin is related to the fragmentation of the Gondwana supercontinent and consequently opening of South Atlantic during early Cretaceous. The basin has a sedimentary infill encompassing four distinct evolution stages, comprising Paleozoic syneclisis, pre-rift, rift and post-rift. The target of this study comprises the post-rift section of the basin focusing deformational styles which affect evaporates from Ipubi Member of the Santana Formation, which is composed by gypsum and anidrite layers interbedded with shales. These units occur widespread across the basin. In the central part of the basin, near Nova Olinda-Santana do Cariri, evaporites are affected by an essentialy brittle deformation tipified by fibrous gypsum filled fractures, cutting massive layers of gypsum and anidrite. Veins with variable orientations and dips are observed in the region distributed over three main populations: i) a dominant NWSE with shallow to moderate NE dipping population, consisting of gypsum filled veins in which fibers are normal to vein walls; i) NE-SW veins with moderate SE dips containing subhorizontal growth fibers; and iii) N-S veins with shallow E-W dips with fibers oblique to vein walls. In the west portion of the basin, near Trindade-Ipubi-Araripina towns, evaporate layers are dominantly constituted by gypsum/anidrite finely stratified, showing a minor density of veins. These layers are affected by a unique style of deformation, more ductile, typified by gentle to open horizontal normal folding with several tens of meters length and with double plunging NW-SE or NE-SW hinges, configuring domic features. In detail, gypsum/anidrite laminae are affected by metre to decimeter scale close to tight folding, usually kinked, with broken hinges, locally turning into box folds. Veins show NE-SW main directions with shallow NE dips, growth fibers are parallel to vein walls, constituting slickenfibers. This region is marked by faults that affect Araripina Formation with NW-SE, NE-SW and E-W directions. The main structural styles and general orientations of structures which affected the post-rift section of Araripe Basin yielded important kinematic information analysis which led us to infer a E-W to NE-SW extension direction to the northeastern part of the Basin, whereas in the southeastern part, extension occurred in N-S direction. Thus, it was possible to determine a regional kinematic setting, through this analysis, characterizing a NE-SW to ENE-WSW system for the post-rift section, which is compatible with the tension settings for the Sout American Plate since Albian. Local variations at the fluid pressure linked (or not) to sedimentary overload variation define local tension settings. This way, at the northeastern portion of the basin, the post-rift deformation was governed by a setting which σ 1 is sub-horizontal trending NE-SW and, σ 3 is sub-vertical, emphasizing a reverse fault situation. At the southwestern portion however there was characterized a strike slip fault setting, featuring σ 1 trending ENEWSW and σ3 trending NNW-SSE |
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Almeida, Camila dehttp://lattes.cnpq.br/1519973126832391Córdoba, Valéria Centurlonhttp://lattes.cnpq.br/8212523609187259Pinheiro, Roberto Vizeu Limahttp://lattes.cnpq.br/3251836412904734Antunes, Alex Francisco2015-03-13T17:08:28Z2010-07-132015-03-13T17:08:28Z2010-02-25ALMEIDA, Camila de. Análise da deformação pós-Rifte na Bacia do Araripe, Nordeste do Brasil. 2010. 108 f. Dissertação (Mestrado em Geodinâmica; Geofísica) - Universidade Federal do Rio Grande do Norte, Natal, 2010.https://repositorio.ufrn.br/jspui/handle/123456789/18802The Araripe Basin is located over Precambrian terrains of the Borborema Province, being part of Northeast Brazil inner basins. Its origin is related to the fragmentation of the Gondwana supercontinent and consequently opening of South Atlantic during early Cretaceous. The basin has a sedimentary infill encompassing four distinct evolution stages, comprising Paleozoic syneclisis, pre-rift, rift and post-rift. The target of this study comprises the post-rift section of the basin focusing deformational styles which affect evaporates from Ipubi Member of the Santana Formation, which is composed by gypsum and anidrite layers interbedded with shales. These units occur widespread across the basin. In the central part of the basin, near Nova Olinda-Santana do Cariri, evaporites are affected by an essentialy brittle deformation tipified by fibrous gypsum filled fractures, cutting massive layers of gypsum and anidrite. Veins with variable orientations and dips are observed in the region distributed over three main populations: i) a dominant NWSE with shallow to moderate NE dipping population, consisting of gypsum filled veins in which fibers are normal to vein walls; i) NE-SW veins with moderate SE dips containing subhorizontal growth fibers; and iii) N-S veins with shallow E-W dips with fibers oblique to vein walls. In the west portion of the basin, near Trindade-Ipubi-Araripina towns, evaporate layers are dominantly constituted by gypsum/anidrite finely stratified, showing a minor density of veins. These layers are affected by a unique style of deformation, more ductile, typified by gentle to open horizontal normal folding with several tens of meters length and with double plunging NW-SE or NE-SW hinges, configuring domic features. In detail, gypsum/anidrite laminae are affected by metre to decimeter scale close to tight folding, usually kinked, with broken hinges, locally turning into box folds. Veins show NE-SW main directions with shallow NE dips, growth fibers are parallel to vein walls, constituting slickenfibers. This region is marked by faults that affect Araripina Formation with NW-SE, NE-SW and E-W directions. The main structural styles and general orientations of structures which affected the post-rift section of Araripe Basin yielded important kinematic information analysis which led us to infer a E-W to NE-SW extension direction to the northeastern part of the Basin, whereas in the southeastern part, extension occurred in N-S direction. Thus, it was possible to determine a regional kinematic setting, through this analysis, characterizing a NE-SW to ENE-WSW system for the post-rift section, which is compatible with the tension settings for the Sout American Plate since Albian. Local variations at the fluid pressure linked (or not) to sedimentary overload variation define local tension settings. This way, at the northeastern portion of the basin, the post-rift deformation was governed by a setting which σ 1 is sub-horizontal trending NE-SW and, σ 3 is sub-vertical, emphasizing a reverse fault situation. At the southwestern portion however there was characterized a strike slip fault setting, featuring σ 1 trending ENEWSW and σ3 trending NNW-SSEA Bacia do Araripe está inserida sobre os terrenos pré-cambrianos da Província Borborema, fazendo parte das bacias interiores do Nordeste do Brasil. Sua origem está relacionada à fragmentação do supercontinente Gondwana e consequente abertura do Atlântico Sul durante o Cretáceo Inferior. Possuindo um preenchimento sedimentar que abrange quatro estágios distintos de sua evolução, compreendendo as tectonossequências de Sinéclise Paleozóica, Pré- Rifte, Rifte e Pós-Rifte. O objeto de estudo deste trabalho, compreende a seção pósrifte da bacia, focando os estilos deformacionais que afetam os evaporitos do Membro Ipubi da Formação Santana, constituída por camadas de gipsita e anidrita intercaladas com folhelho, de ocorrência abrangente em toda a Bacia do Araripe Na parte Norte da bacia, nas proximidades de Nova Olinda-Santana do Cariri os evaporitos são afetados por uma deformação essencialmente frágil, tipificada por fraturas preenchidas por gipsita fibrosa, recortando camadas de gipsita e anidrita geralmente maciças. Na região são observados veios com orientações e mergulhos bastante variados, distribuindo-se segundo três populações principais: (i) uma com direção dominante NW-SE, com mergulhos suaves a moderados essencialmente para NE, geralmente preenchidos por gipsita cujas fibras dispõem-se ortogonalmente às paredes dos veios; (ii) veios NE-SW com mergulhos moderados para SE, contendo fibras de crescimento suborizontais; e (iii) veios N-S, com mergulhos suaves para E-W, cujas as fibras encontram-se obliquas às paredes desses veios. Na região oeste da bacia, nas proximidades de Trindade-Ipubi-Araripina a camadas de evaporitos são dominantemente constituídas por gipsita/anidrita finamente estratificada, apresentando uma densidade menor de veios. Essas camadas são afetadas por uma deformação peculiar, de caráter mais dúctil , tipificada por dobras horizontais, de perfil suave a aberto, com comprimento de onda de várias dezenas de metros, não raro apresentando charneiras com duplo caimento, com orientações NWSE ou NE-SW, constituindo feições dômicas. Em detalhe, as lâminas de gipsita/anidrita também são afetadas por dobras de escala métrica a decimétrica, em geral de perfil fechado a apertado, muitas vezes apresentando estilo em kink (não é raro nestes casos ocorrer ruptura da charneira), localmente constituindo dobras em caixa. Os veios (ocorrendo de forma mais rara) apresentam direções principais NE-SW, com mergulhos suaves para SE, as fibras de crescimento dispõem-se paralelamente às paredes dos veios, funcionando como slickenfibers. Está região é marcada pelas falhas que afetam as rochas da Formação Araripina apresentando direções NW-SE, NE-SW e E-W. De posse das análises dos estilos e da orientação geral das estruturas que afetam a seção pós-rifte na Bacia do Araripe, através do método dos diedros retos, foram obtidas informação importante quanto à análise cinemática da deformação, possibilitando assim, definir os sentidos de transporte tectônico predominantes e a inferência do estado de paleotensões que governou a instalação das estruturas tectônicas presentes. Sendo assim, foi possível definir um regime cinemático regional, a partir desta análise, caracterizado a seção pós-rifte por um sistema de compressão NE-SW a ENEWSW, regime este condizente com o que vem atuando na Placa Sul-Americana desde, pelo menos, o Albiano. Variações locais da pressão de fluidos somadas (ou não) a variações da sobrecarga sedimentar definem regimes cinemáticos particulares. Assim, na porção nordeste da bacia, a deformação pós-rifte foi governada por um regime em que σ1 é suborizontal e apresenta direção NE-SW, e σ3 é subvertical, denotando um regime de falha inversa . Já na porção sudoeste da Bacia do Araripe foi caracterizado um regime de falha transcorrente , apresentando σ1 na direção ENE-WSW e σ3 orientado segundo NNW-SSEapplication/pdfporUniversidade Federal do Rio Grande do NortePrograma de Pós-Graduação em Geodinâmica e GeofísicaUFRNBRGeodinâmica; GeofísicaVeios fibrososEstilos deformacionaisMétodo dos diedros retosFibrous veinsDeformation stylesMethod of dihedral anglesCNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOFISICAAnálise da deformação pós-Rifte na Bacia do Araripe, Nordeste do Brasilinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRNinstname:Universidade Federal do Rio Grande do Norte (UFRN)instacron:UFRNORIGINALCamilaA_DISSERT.pdfCamilaA_DISSERT.pdfapplication/pdf12328696https://repositorio.ufrn.br/bitstream/123456789/18802/1/CamilaA_DISSERT.pdf4cea5c0815f4e4e4b713e6ec05bdfd16MD51TEXTCamilaA_DISSERT.pdf.txtCamilaA_DISSERT.pdf.txtExtracted texttext/plain136164https://repositorio.ufrn.br/bitstream/123456789/18802/6/CamilaA_DISSERT.pdf.txtf4ec2d1d4d1d465c7a5b6c1e2a2debafMD56THUMBNAILCamilaA_DISSERT.pdf.jpgCamilaA_DISSERT.pdf.jpgIM Thumbnailimage/jpeg3494https://repositorio.ufrn.br/bitstream/123456789/18802/7/CamilaA_DISSERT.pdf.jpg2e17057dead4996bcaee33ea33b93f82MD57123456789/188022017-11-02 18:39:46.959oai:https://repositorio.ufrn.br:123456789/18802Repositório de PublicaçõesPUBhttp://repositorio.ufrn.br/oai/opendoar:2017-11-02T21:39:46Repositório Institucional da UFRN - Universidade Federal do Rio Grande do Norte (UFRN)false |
dc.title.por.fl_str_mv |
Análise da deformação pós-Rifte na Bacia do Araripe, Nordeste do Brasil |
title |
Análise da deformação pós-Rifte na Bacia do Araripe, Nordeste do Brasil |
spellingShingle |
Análise da deformação pós-Rifte na Bacia do Araripe, Nordeste do Brasil Almeida, Camila de Veios fibrosos Estilos deformacionais Método dos diedros retos Fibrous veins Deformation styles Method of dihedral angles CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOFISICA |
title_short |
Análise da deformação pós-Rifte na Bacia do Araripe, Nordeste do Brasil |
title_full |
Análise da deformação pós-Rifte na Bacia do Araripe, Nordeste do Brasil |
title_fullStr |
Análise da deformação pós-Rifte na Bacia do Araripe, Nordeste do Brasil |
title_full_unstemmed |
Análise da deformação pós-Rifte na Bacia do Araripe, Nordeste do Brasil |
title_sort |
Análise da deformação pós-Rifte na Bacia do Araripe, Nordeste do Brasil |
author |
Almeida, Camila de |
author_facet |
Almeida, Camila de |
author_role |
author |
dc.contributor.authorID.por.fl_str_mv |
|
dc.contributor.advisorID.por.fl_str_mv |
|
dc.contributor.advisorLattes.por.fl_str_mv |
http://lattes.cnpq.br/1519973126832391 |
dc.contributor.referees1.pt_BR.fl_str_mv |
Córdoba, Valéria Centurlon |
dc.contributor.referees1ID.por.fl_str_mv |
|
dc.contributor.referees1Lattes.por.fl_str_mv |
http://lattes.cnpq.br/8212523609187259 |
dc.contributor.referees2.pt_BR.fl_str_mv |
Pinheiro, Roberto Vizeu Lima |
dc.contributor.referees2ID.por.fl_str_mv |
|
dc.contributor.referees2Lattes.por.fl_str_mv |
http://lattes.cnpq.br/3251836412904734 |
dc.contributor.author.fl_str_mv |
Almeida, Camila de |
dc.contributor.advisor1.fl_str_mv |
Antunes, Alex Francisco |
contributor_str_mv |
Antunes, Alex Francisco |
dc.subject.por.fl_str_mv |
Veios fibrosos Estilos deformacionais Método dos diedros retos |
topic |
Veios fibrosos Estilos deformacionais Método dos diedros retos Fibrous veins Deformation styles Method of dihedral angles CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOFISICA |
dc.subject.eng.fl_str_mv |
Fibrous veins Deformation styles Method of dihedral angles |
dc.subject.cnpq.fl_str_mv |
CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOFISICA |
description |
The Araripe Basin is located over Precambrian terrains of the Borborema Province, being part of Northeast Brazil inner basins. Its origin is related to the fragmentation of the Gondwana supercontinent and consequently opening of South Atlantic during early Cretaceous. The basin has a sedimentary infill encompassing four distinct evolution stages, comprising Paleozoic syneclisis, pre-rift, rift and post-rift. The target of this study comprises the post-rift section of the basin focusing deformational styles which affect evaporates from Ipubi Member of the Santana Formation, which is composed by gypsum and anidrite layers interbedded with shales. These units occur widespread across the basin. In the central part of the basin, near Nova Olinda-Santana do Cariri, evaporites are affected by an essentialy brittle deformation tipified by fibrous gypsum filled fractures, cutting massive layers of gypsum and anidrite. Veins with variable orientations and dips are observed in the region distributed over three main populations: i) a dominant NWSE with shallow to moderate NE dipping population, consisting of gypsum filled veins in which fibers are normal to vein walls; i) NE-SW veins with moderate SE dips containing subhorizontal growth fibers; and iii) N-S veins with shallow E-W dips with fibers oblique to vein walls. In the west portion of the basin, near Trindade-Ipubi-Araripina towns, evaporate layers are dominantly constituted by gypsum/anidrite finely stratified, showing a minor density of veins. These layers are affected by a unique style of deformation, more ductile, typified by gentle to open horizontal normal folding with several tens of meters length and with double plunging NW-SE or NE-SW hinges, configuring domic features. In detail, gypsum/anidrite laminae are affected by metre to decimeter scale close to tight folding, usually kinked, with broken hinges, locally turning into box folds. Veins show NE-SW main directions with shallow NE dips, growth fibers are parallel to vein walls, constituting slickenfibers. This region is marked by faults that affect Araripina Formation with NW-SE, NE-SW and E-W directions. The main structural styles and general orientations of structures which affected the post-rift section of Araripe Basin yielded important kinematic information analysis which led us to infer a E-W to NE-SW extension direction to the northeastern part of the Basin, whereas in the southeastern part, extension occurred in N-S direction. Thus, it was possible to determine a regional kinematic setting, through this analysis, characterizing a NE-SW to ENE-WSW system for the post-rift section, which is compatible with the tension settings for the Sout American Plate since Albian. Local variations at the fluid pressure linked (or not) to sedimentary overload variation define local tension settings. This way, at the northeastern portion of the basin, the post-rift deformation was governed by a setting which σ 1 is sub-horizontal trending NE-SW and, σ 3 is sub-vertical, emphasizing a reverse fault situation. At the southwestern portion however there was characterized a strike slip fault setting, featuring σ 1 trending ENEWSW and σ3 trending NNW-SSE |
publishDate |
2010 |
dc.date.available.fl_str_mv |
2010-07-13 2015-03-13T17:08:28Z |
dc.date.issued.fl_str_mv |
2010-02-25 |
dc.date.accessioned.fl_str_mv |
2015-03-13T17:08:28Z |
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 |
ALMEIDA, Camila de. Análise da deformação pós-Rifte na Bacia do Araripe, Nordeste do Brasil. 2010. 108 f. Dissertação (Mestrado em Geodinâmica; Geofísica) - Universidade Federal do Rio Grande do Norte, Natal, 2010. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufrn.br/jspui/handle/123456789/18802 |
identifier_str_mv |
ALMEIDA, Camila de. Análise da deformação pós-Rifte na Bacia do Araripe, Nordeste do Brasil. 2010. 108 f. Dissertação (Mestrado em Geodinâmica; Geofísica) - Universidade Federal do Rio Grande do Norte, Natal, 2010. |
url |
https://repositorio.ufrn.br/jspui/handle/123456789/18802 |
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por |
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por |
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info:eu-repo/semantics/openAccess |
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openAccess |
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Universidade Federal do Rio Grande do Norte |
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Programa de Pós-Graduação em Geodinâmica e Geofísica |
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UFRN |
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BR |
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Geodinâmica; Geofísica |
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Universidade Federal do Rio Grande do Norte |
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