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Previous issue date: 2015-07-13 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / A porosidade e permeabilidade em zonas fraturadas podem aumentar devido a fluidos ascendentes em sistemas c?rsticos. Este trabalho apresenta uma an?lise estrutural de duas cavernas hipog?nicas da Am?rica do Sul . A ?rea de estudo inclui a Toca da Boa Vista (TBV) e Toca da Barriguda (TBR), que possuem 115 km e 32 km respectivamente. Este sistema c?rstico ocorre em carbonatos neoproterozoicos da Forma??o Salitre, por??o norte do cr?ton S?o Francisco. Durante o Brasiliano foram formados cintur?es de dobramento ao redor do cr?ton com padr?o compressivo desenvolvido entre 740-580 Ma. A metodologia inclui mapas de condutos do Grupo Bambu? de Pesquisas Espeleol?gicas, a partir dos quais foram elaborados mapas estruturais das cavernas e compara??o com a deforma??o regional. Os softwares usados para processamento de dados estruturais foram: Openstereo, Stereonet 8, Georient 9.4.5 e Tectonic FP. A An?lise da deforma??o do sistema TBV-TBR e o contexto regional da Forma??o Salitre permitiu concluir que: i) os condutos se desenvolveram ao longo de eixos de anticlinais N-S e ENE para E-W; ii) o desenvolvimento do carste foi formado pela dissolu??o de juntas subverticais; iii) o primeiro evento de dobramento F1 corresponde a trend N-S compressional e provavelmente se desenvolveu no Brasiliano, e, o segundo evento F2 est? relacionado a compress?o E-W, provavelmente mais recente que o Brasiliano. Portanto, ? poss?vel confirmar que existe rela??o direta dos fluidos ascendentes e dissolu??o hipog?nica com a deforma??o regional. / Porosity and permeability along fractured zones of carbonate rocks could be enhanced by ascending fluid flow in karst regions. This work presents a structural analysis of two largest hypogenic caves in South America. The study area encompasses the Toca da Boa Vista (TBV) and Toca da Barriguda (TBR) caves, which are 115 km and 32 km long, respectively. This karst system occurs in the Neoproterozoic carbonates of the Salitre Formation, in the northern part of the S?o Francisco craton. The fold belts around and at the craton edges were deformed during the Brasiliano orogeny in a compressive setting at 740-580 Ma. Methodology includes maps of conduits available by Bambu? Group of Speleological Research, which were used to constructo structural maps of caves and comparison to regional deformation. The following softwares were used to process structural data: Openstereo, Stereonet 8, Georient 9.4.5 e Tectonic FP. Analysis of deformation of TBV-TBR system and the context of Salitre Formation allowed to conclude that: i) Cave passages developed subhorizontally along (a) N-S and (b) ENE to E-W-oriented anticlines hinges; ii) Karst development were formed by dissolution of subvertical joints, iii) The first folding event F1 corresponds to a N-S-trending compression, probably during Brasiliano event whereas the second event F2, is related a E-W-compression, probably more recent than Brasiliano event. So, it is possible to confirm that fluid flow and related dissolution pathways have a close relationship with regional deformation.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/20451 |
| Date | 13 July 2015 |
| Creators | Silva, Renata de Ara?jo Ennes |
| Contributors | 37923579415, http://lattes.cnpq.br/6050302316049061, Srivastava, Narendra Kumar, 22232591468, http://lattes.cnpq.br/0257859086244893, Lima, Elissandra Nascimento de Moura, 03611790494, http://lattes.cnpq.br/8939874789327011, Bezerra, Francisco Hil?rio Rego |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM GEODIN?MICA E GEOF?SICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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