Padrões geoacústicos de fundo e sub-fundo na Baía de Sepetiba: implicações no conhecimento da geologia do holoceno

• Ano de defesa: 2011
• Autor(a) principal: Fabri, Juliana Buy
• Orientador(a): Dias, Marcelo Sperle
• Banca de defesa: Guerra, Josefa Varela , Bastos, Alex Cardoso
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade do Estado do Rio de Janeiro
• Programa de Pós-Graduação: Programa de Pós-Graduação em Oceanografia
• Departamento: Centro de Tecnologia e Ciências::Faculdade de Oceanografia
• País: BR
• Palavras-chave em Português: Baía de Sepetiba; Geofísica marinha; Evolução sedimentar; Neotectonismo
• Palavras-chave em Inglês: Sepetiba Bay; Marine geophysics; Sedimentary evolution; Neotectonism
• Área do conhecimento CNPq: CNPQ::CIENCIAS EXATAS E DA TERRA::OCEANOGRAFIA::OCEANOGRAFIA GEOLOGICA
• Link de acesso: http://www.bdtd.uerj.br/handle/1/13869

The Sepetiba Bay, located between the Guanabara Bay and the Ilha Grande Bay, Rio de Janeiro State, is part of a strategic scenario for the economic development of the State. This is due to increased population density, which is directly related to tourism, with the presence of ports and industrial areas. Therefore, it is necessary to study its geological structure and sediment dynamics to understand its evolution over time and to a more rational use of this area. By using high resolution seismics and side scan sonar data, this study aims to investigate the holocenic geology. The subsurface investigation of its structural and sedimentary geology, by interpretation of seismic profiles, were based in the determination of the seismic facies, along the Holocene. It was found 15 seismic facies premaking 14 sedimentaries layers that were separated in 4 Groups according to their distribution. The research with the side scan sonar, was based on the different degrees of acoustic backscattering and was parameterized by data from direct sampling. It was identified six distinct sonar patterns . Thus a new textural map of the distribution of surface sediments was made. With the correlation of seismic profiles and side scan sonar data it is possible to map a shallow fault that suggests the existence of a possible neotectonism in the study area.