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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Caracteriza??o geomorfol?gica e paleogeogr?fica da plataforma continental adjacente a foz do Rio Apodi-Mossor?, RN/Brasil

Lima, Samia Freire 15 March 2006 (has links)
Made available in DSpace on 2015-03-13T17:08:41Z (GMT). No. of bitstreams: 1 SamiaFL.pdf: 2363626 bytes, checksum: 8067b8065fc31135e35d263ce60bc5e0 (MD5) Previous issue date: 2006-03-15 / The brazilian marginal basins have a huge potential to generate and accumulate petroleum. Incised valleys which are eroded in response to a fall of relative sea level are related to potential reservoir as well, modern drowned-valley estuaries serve as harbors to petroleum and salt industries, fisheries, waste-disposal sites and recreational areas for a significant fraction of the world s population. The combined influence of these factors has produced a dramatic increase in research on modern and ancient incised-valley systems. This research is one expression of this interest. The integrated use of satellites images and high resolution seismic (bathymetry, sides scan sonar) was used on the Apodi River mouth-RN to characterizes the continental shelf This area is located at the Potiguar Basin in the NE Brazilian Equatorial Atlantic margin. Through bathymetric and side scan sonar data processing, a digital Terrain Model was developed, and a detailed geomorphologic analysis was performed. In this way was possible to recognize the geomorphologic framework and differents sismofacies, which may influence this area. A channel extending from the ApodiMossor? river mouth to the shelf edge dominates the investigated area. This structure can be correlated with the former river valley developed during the late Pleistocene sea level fall. This channel has two main directions (NW-SE and NE-SW) probably controlled by the Potiguar Basin structures. The western margin of the channel is relatively steep and pronounced whereas the eastern margin consists only of a gentle slope. Longitudinal bedforms and massive ridges also occur. The first are formed doe to the shelf sediment rework and the reef-like structures probably are relics of submerged beachrock-lines indicating past shoreline positions during the deglacial sea-level rise. The sub-bottom seismic data allow the identification of different sismic patterns and a marcant discontinuity, interpreted as the Upper / As bacias marginais brasileiras t?m um grande potencial gerador e acumulador de petr?leo, em geral associados a um sistema de vales incisos que s?o desenvolvidos em resposta a queda do n?vel do mar. Esses sistemas est?o diretamente relacionados com atividades econ?micas desenvolvidas em regi?es costeiras, como portos para ind?stria petrol?fera, salineira, pesqueira e atividades recreativa para uma significante fra??o da popula??o mundial. Esta disserta??o apresenta a caracteriza??o geomorfol?gica e paleogeogr?fica da plataforma continental brasileira adjacente ? foz do rio Apodi-Mossor?/RN, atrav?s do uso integrado de imagens de sat?lite e geof?sica de alta resolu??o (batimetria, s?smica e sonar de varredura lateral). Essa regi?o est? localizada na Bacia Potiguar, na Margem Equatorial Atl?ntica. A partir dos dados batimetricos, foi confeccionado e aferido um modelo digital de terreno (MOT), e desenvolvida uma an?lise geomorfol?gica detalhada, que integrada aos dados hidrodin?micos proporcionou uma melhor compreens?o dos fatores oceanogr?ficos atuantes na regi?o, de forma a entender a resposta geomorfol?gica dessa regi?o afogada pela r?pida subida do n?vel do mar, no Holoceno. A principal fei??o identificada foi um canal submerso na plataforma interna, provavelmente relacionado com o sistema de vales incisos formado durante o rebaixamento do n?vel do mar no Pleistoceno. O canal tem duas dire??es principais (NW-SE e NE-SW), aparentemente controladas pelas estruturas tect?nicas da Bacia Potiguar. A margem oeste do canal ? relativamente soerguida em rela??o ? margem leste. Este soerguimento ? aqui relacionado ? presen?a do Alto de Icapu? a oeste da ?rea. Recifes e dunas submersas tamb?m est?o presentes na ?rea. Os recifes relacionados a estruturas reliquiares submersas como rochas de praia podendo indicar antigas linhas de costa posicionadas durante a subida do n?vel do mar. Com base nos dados s?smicos, foi poss?vel identificar uma descontinuidade presente em todas a ?rea interpretada como o limite Pleistoceno Superior/Holoceno Inferior, bem como sismof?cies referentes a diferentes padr?es de preenchimento e sedimenta??o do canal submerso e da plataforma durante a subida do n?vel do mar no Holoceno

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