Da fonte à bacia: interação continente-oceano no sistema sedimentar Rio São Francisco, Brasil

• Autor(a) principal: Fontes, Luiz Carlos da Silveira [UNESP]
• Data de Publicação: 2015
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/139414; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/19-05-2016/000865807.pdf
• topic: Hydrography; Hidrografia; Bacias sedimentares; Plataforma continental; São Francisco, Rio; Geologia estratigráfica - Quaternário

The São Francisco River basin, with an area of about 640,000 km2, covers seven units of the Brazilian National State. The São Francisco River crosses 2.700 km long on the mainland, the springs in the Canastra Mountain, Minas Gerais, to the mouth in the Atlantic ocean between Sergipe and Alagoas. This basin is totally national and historical one, this river has been considered as the river of national integration, uniting the Southeast and Northeast regions. The use of its waters has enabled the wide footprint in the northeastern semi-arid and has been an important source of hydroelectric power generation. At the meeting with the Atlantic Ocean its sediments contribute to the development of a broad coastal plain, recognized internationally as a delta, dominated by waves. In the marine area adjacent to the mouth, form a large muddy area in the continental shelf and digs a submarine canyon on the continental slope, forming a broad range submarine in deep waters. This wide context of depositional environments and their respective river deposits, coastal and marine has been studied in a segmented manner by several authors. The current study focuses on this sedimentary system river-sea in an integrated manner, analyzing the set of depositional systems of the continent to the ocean, at depths of up 4,000 m, in an evolutionary geological perspective, since its deployment in the Pleistocene until the present day. Research focus on information obtained in surface and subsurface in the coastal and marine area, reconstituting the morpho-structural controls and geoenvironmental Pleistocene-Holocene evolution of the range. The study considers the conjunction of river inputs to the factors related to the oceanographic dynamics, such as waves, tides and currents. The influence of fluvial contribution is documented in deposits of marine region, not only in continental platform and submarine canyons, but also in continental foot, which extends to the...