Made available in DSpace on 2014-06-11T19:26:14Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-02-09Bitstream added on 2014-06-13T19:54:20Z : No. of bitstreams: 1 godoy_df_me_rcla.pdf: 2236486 bytes, checksum: c314a2c10e00777a70b2fb37fac8481b (MD5) / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / Neste trabalho foram desenvolvidos estudos termocronológicos em três altos estruturais, sendo eles o Domo de Pitanga, o Horst de Pau d'Álho e o alto de Jibóia, localizados na borda leste da Bacia do Paraná, próximo às cidades de Rio Claro e Piracicaba, centro do Estado de São Paulo. A aplicação de um método de datação com baixa temperatura de fechamento (120° C) e cujas características físicas permitem a modelagem de histórias térmicas, permitiu a diferenciação de eventos tectônicos atuantes na área, bem como a magnitude térmica alcançada por estes eventos. A utilização do método analítico do detector externo (EDM) possibilitou uma datação segura de rochas sedimentares, o que não é possível com o método da população dado às características genéticas destas rochas. No geral, as histórias térmicas obtidas para as estruturas abrangem o Meso-Cenozóico, permitindo diferenciar 5 eventos de idades Juro-Cretácica, Eo Cretácica, Neo Cretácica, Paleogênica e Neogênica, sendo que o principal em magnitute térmica foi o evento Neo Cretácico. Observou-se que estes episódios possuem estreita relação temporal com a tectônica regional da borda da bacia e da porção circundante do embasamento cristalino, mostrando a resposta térmica destes eventos nas estruturas estudadas. Este trabalho vem complementar os estudos já realizados até o momento em estruturas deste tipo, introduzindo dados de datações absolutas e de história térmica à trabalhos de análise estrutural e datações relativas destes eventos aqui detectados. / In this work was developed studies about termocronology in three high structural, the Pitanga Dome, the Pau d'Alho Horst de and the high of the Jibóia, located in the edge east of the Parana Basin, next the cities to Rio Claro and Piracicaba, in the center of the State of São Paulo - Brazil. The application of a method of dating with low temperature of closing (120° C) and whose physical characteristics allow the construction of thermal histories, allowed the differentiation of tectonics events that had acted in the area, as well as the thermal magnitude reached by these events. The use of the analytical method of the external detector (EDM) made possible a trust dating of sedimentary rocks, what it is not possible with the method of the given population the genetic characteristics of these rocks. In the generality, the gotten thermal histories for the structures enclose the Meso-Cenozoic, allowing to different 5 events of ages Jurassic - Cretacic, Eo Cretacic, Neo Cretacic, Paleogenic and Neogenic, being the main, with biggest thermal magnitude, in Neo Cretacic. It was observed that there are too relation between these episodes and the regional tectonic of the edge of basin and the next crystalline region, showing the thermal reply of these events in the studied structures. This work complements the studies carried through until the moment in structures of this type, added given of absolute datings and thermal histories in works of the analyzes structural and relative datings of these detected events.

Orientador: Peter Christian Hackspacher / Banca: Sandro de Oliveira Guedes / Banca: Pedro José Iunes / Resumo: Neste trabalho foram desenvolvidos estudos termocronológicos em três altos estruturais, sendo eles o Domo de Pitanga, o Horst de Pau d'Álho e o alto de Jibóia, localizados na borda leste da Bacia do Paraná, próximo às cidades de Rio Claro e Piracicaba, centro do Estado de São Paulo. A aplicação de um método de datação com baixa "temperatura de fechamento" (120° C) e cujas características físicas permitem a modelagem de histórias térmicas, permitiu a diferenciação de eventos tectônicos atuantes na área, bem como a magnitude térmica alcançada por estes eventos. A utilização do método analítico do detector externo (EDM) possibilitou uma datação segura de rochas sedimentares, o que não é possível com o método da população dado às características genéticas destas rochas. No geral, as histórias térmicas obtidas para as estruturas abrangem o Meso-Cenozóico, permitindo diferenciar 5 eventos de idades Juro-Cretácica, Eo Cretácica, Neo Cretácica, Paleogênica e Neogênica, sendo que o principal em magnitute térmica foi o evento Neo Cretácico. Observou-se que estes episódios possuem estreita relação temporal com a tectônica regional da borda da bacia e da porção circundante do embasamento cristalino, mostrando a resposta térmica destes eventos nas estruturas estudadas. Este trabalho vem complementar os estudos já realizados até o momento em estruturas deste tipo, introduzindo dados de datações absolutas e de história térmica à trabalhos de análise estrutural e datações relativas destes eventos aqui detectados. / Abstract: In this work was developed studies about termocronology in three high structural, the Pitanga Dome, the Pau d'Alho Horst de and the high of the Jibóia, located in the edge east of the Parana Basin, next the cities to Rio Claro and Piracicaba, in the center of the State of São Paulo - Brazil. The application of a method of dating with low "temperature of closing" (120° C) and whose physical characteristics allow the construction of thermal histories, allowed the differentiation of tectonics events that had acted in the area, as well as the thermal magnitude reached by these events. The use of the analytical method of the external detector (EDM) made possible a trust dating of sedimentary rocks, what it is not possible with the method of the given population the genetic characteristics of these rocks. In the generality, the gotten thermal histories for the structures enclose the Meso-Cenozoic, allowing to different 5 events of ages Jurassic - Cretacic, Eo Cretacic, Neo Cretacic, Paleogenic and Neogenic, being the main, with biggest thermal magnitude, in Neo Cretacic. It was observed that there are too relation between these episodes and the regional tectonic of the edge of basin and the next crystalline region, showing the thermal reply of these events in the studied structures. This work complements the studies carried through until the moment in structures of this type, added given of absolute datings and thermal histories in works of the analyzes structural and relative datings of these detected events. / Mestre

Pendant des années, la recherche s'est principalement concentrée sur le soulèvement Andin de la Cordillère orientale de Colombie et sur l’étude des sédiments tertiaires dans les bassins sédimentaires pour comprendre la déformation andine. Récemment, la nécessité d'évaluer de nouvelles cibles a poussé l'industrie pétrolière à acquérir de nouvelles informations sur la série crétacée de la Cordillère Orientale (CO) et du cours moyen du Rio Magdalena (CMM). Le but de ce travail, est d'analyser ces données qui suggèrent que les sédiments du bassin du CMM ont été déformés au Crétacé.Les sédiments crétacés sont exposés dans la CO, mais seuls quelques affleurements sont connus dans le CMM. En revanche, beaucoup les informations de nombreuses lignes sismiques et de quelques puits traversant les unités crétacées sont disponibles sur cette zone. L’interprétation de quelques lignes sismiques sélectionnées du CMM a été contrôlée par les données de puits et et les observations de terrain, et la nature et le style des déformations observées ont été analysées. De cette façon, des discontinuités importantes et des structures tectoniques ont été identifiées, montrant que des failles ont été inversées tectoniquement par à-coups au Crétacé, avant l'orogenèse andine. Cette vision détaillée de l’évolution tectonique et sédimentaire de la série crétacée, surtout dans le CMM, met en évidence des discordances multiples résultant de multiples phases de déformation, de soulèvement et/ou de variations du niveau marin survenant au cours du Crétacé. Ceci est important pour comprendre les processus affectant la marge andine au Crétacé, puisque les interactions entre tectonique et variations eustatiques pourraient avoir été plus complexes que proposé antérieurement.L’analyse des traces de fission sur zircon et apatite et la modélisation thermique du Nord au Sud de la zone d'étude ont été faites sur des échantillons du Crétacé indiquant l'occurrence de deux événements thermiques et deux événements de refroidissement pour des unités anté-Campaniennes, et d'un réchauffement et d’un refroidissement pour les unités postérieures à ~ 70 Ma. Enfin, un régime de subduction cyclique pourrait expliquer les événements tectoniques extensifs et compressifs responsable des phases de dépôt, d'exhumation et d'érosion observées dans le CMM et l’OCO entre le Jurassique terminal et le Paléocène.L'analyse réalisée à l'aide de la stratigraphie et des cartes de faciès génère au chapitre 3, L'interprétation structurelle, chronostratigraphie en utilisant des diagrammes de roues, restauration structurelle schématique, permettant de reconnaître plusieurs cycles de dépôt (S1 à S5) limités par discordances (SU1 à SU5), sont le résultat de la fluctuation du niveau de la mer (cycles de régression-transgression) générée pour les événements tectoniques liés au régime de subduction des dalles. / For years, studies have been mainly focused on the Andean uplift of the Eastern Cordillera in Colombia and on the evaluation of the Tertiary units in sedimentary basins, in order to understand the recent deformation. Recently, due to the necessity oil industry to evaluate new targets, new information has been acquired on Cretaceous units form the Eastern Cordillera (EC) and the Middle Magdalena Valley (MMV). The aim of this work, is to analyses these data, which provide evidences for Cretaceous deformation in the basin of the MMV.Cretaceous sediments are exposed in the Eastern Cordillera, but only few outcrops are known in the MMV. Instead, a lot of seismic information is available and some drilled wells crosscut the Cretaceous units in this area. The interpretation of some key seismic sections in the MMV has been validated using field observation and well information, and the nature and style of the observed structures have been discussed. By these means, important Cretaceous unconformities and tectonic structures were identified, showing that some faults were progressively, tectonically inverted, prior to the Andean Orogeny. The resulting detailed picture of the Cretaceous tectonic and sedimentary evolution, especially in the MMV, evidences multiple unconformities resulting from different stages of deformation, uplift and/or level sea changes during the Cretaceous. This must be kept in mind to understand the processes acting in the Andean margin during the Cretaceous, since the interaction between deformation and sea level changes may have been more complex than previously thought.The fission tracks analyses on zircon and apatite and the thermal modeling from the North to the South of the study area were made on Cretaceous samples indicate the occurrence of two heating events and two events of cooling for pre-Campanian units, and of one event of heating and one event of cooling from units younger than ~ 70 Ma. Finally, a cyclic subduction regime may explain the tectonic extension and compression events responsible for the deposition, exhumation and erosion phases observed in the MMV and WEC from the latest Jurassic to the Paleocene.The analysis made using stratigraphy and the facies maps generate in chapter 3, The structural interpretation, chronostratigraphy chart using wheeler diagrams, schematic structural restauration, permit to recognize several cycles of deposition (S1 to S5) limited by unconformities (SU1 to SU5), which are the result of sea level fluctuation (Regression-Transgression cycles) generated for the Tectonic events related to the regimen of slabs subduction.