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The Argentine continental margin is characterised by a large contourite depositional system driven by southern-sourced water masses flowing at different water depths. Interest in contourite deposits is increasing in geoscience and related fields, though knowledge of the Argentine contourite system is still limited. In particular, studies based on core data providing detailed descriptions of sedimentary facies are lacking, as are investigations of principal sediment source areas and of key factors controlling sedimentary processes. This study combines visual core description and downcore grain-size analyses as well as petrographic thin-section and magnetic susceptibility analyses of 14 cores from intermediate water depths of 616-1,208 m to characterise contourite deposits on the north-eastern Argentinean slope. Gravel-rich, sandy-silty and muddy contourites as well as hemipelagic facies were identified. The deposition of these contourites was presumably controlled by sea level, the depth range of the Antarctic water mass, climate conditions and windborne terrigenous supply. It is proposed that, during glacial lowstands, muddy contourites were deposited at depths <900 m, whereas sandy-silty sequences dominated at deeper depths. During the late Pleistocene-Holocene transition, sandy-silty contourites covered the entire middle slope. Hemipelagic facies draped limited sectors of the middle slope when the sea level reached the present-day position and gravel-rich contourites became restricted to contouritic channels and moats. Northern Patagonia and the southern Pampa are the most plausible sources for sediments deposited via along-slope processes, whereas the Tandilia Range is the best candidate for sediments deposited via down-slope processes. © 2011 Springer-Verlag.


Documento: Artículo
Título:Middle slope contourite deposits and associated sedimentary facies off NE Argentina
Autor:Bozzano, G.; Violante, R.A.; Cerredo, M.E.
Filiación:Sección Geología Marina, Servicio de Hidrografía Naval, Av. Montes de Oca 2124, C1270ABV Buenos Aires, Argentina
Departamento Cs Geológicas, FCEyN, Universidad de Buenos Aires, Ciudad Universitaria, Argentina
Palabras clave:Argentina; Climate condition; Continental margin; Contourite depositional systems; Depth range; Geosciences; Key factors; Late Pleistocene-Holocene; Patagonia; Sediment source areas; Sedimentary facies; Sedimentary process; Water depth; Water mass; Anoxic sediments; Deposits; Gravel; Magnetic susceptibility; Sea level; Sedimentology; Process control; continental margin; deposition; facies; grain size; petrography; Pleistocene-Holocene boundary; sea level; slope; water depth; water mass; Argentina
Página de inicio:495
Página de fin:507
Título revista:Geo-Marine Letters
Título revista abreviado:Geo-Mar. Lett.


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---------- APA ----------
Bozzano, G., Violante, R.A. & Cerredo, M.E. (2011) . Middle slope contourite deposits and associated sedimentary facies off NE Argentina. Geo-Marine Letters, 31(5-6), 495-507.
---------- CHICAGO ----------
Bozzano, G., Violante, R.A., Cerredo, M.E. "Middle slope contourite deposits and associated sedimentary facies off NE Argentina" . Geo-Marine Letters 31, no. 5-6 (2011) : 495-507.
---------- MLA ----------
Bozzano, G., Violante, R.A., Cerredo, M.E. "Middle slope contourite deposits and associated sedimentary facies off NE Argentina" . Geo-Marine Letters, vol. 31, no. 5-6, 2011, pp. 495-507.
---------- VANCOUVER ----------
Bozzano, G., Violante, R.A., Cerredo, M.E. Middle slope contourite deposits and associated sedimentary facies off NE Argentina. Geo-Mar. Lett. 2011;31(5-6):495-507.