Middle slope contourite deposits and associated sedimentary facies off NE Argentina

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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 i...

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Autor principal: Bozzano, G.
Otros Autores: Violante, R.A, Cerredo, M.E
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: 2011
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245 1 0 |a Middle slope contourite deposits and associated sedimentary facies off NE Argentina 
260 |c 2011 
270 1 0 |m Bozzano, G.; Sección Geología Marina, Servicio de Hidrografía Naval, Av. Montes de Oca 2124, C1270ABV Buenos Aires, Argentina; email: grazi.hidro.gov.ar@gmail.com 
506 |2 openaire  |e Política editorial 
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520 3 |a 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.  |l eng 
536 |a Detalles de la financiación: PICT2010-0953, PICT2003-14417 
536 |a Detalles de la financiación: Acknowledgements This research was supported by the Argentine National Agency ANPCyT research projects PICT2003-14417 and PICT2010-0953. Magnetic susceptibility analyses on LBIV cores were performed by M.J. Orgeira and Scleractinia identification by R. Garberoglio (Geological Science Department, Buenos Aires University). This manuscript benefits from discussion with J.L. Cavallotto and assistance from S. Marcolini, H. Martinez and A. de León. Two anonymous reviewers, A. Voelker (guest editor) and the journal editors are acknowledged for insightful comments that contributed to improve the quality of the manuscript. 
593 |a Sección Geología Marina, Servicio de Hidrografía Naval, Av. Montes de Oca 2124, C1270ABV Buenos Aires, Argentina 
593 |a Departamento Cs Geológicas, FCEyN, Universidad de Buenos Aires, Ciudad Universitaria, Argentina 
651 4 |a ARGENTINA 
651 4 |a ARGENTINA 
690 1 0 |a CLIMATE CONDITION 
690 1 0 |a CONTINENTAL MARGIN 
690 1 0 |a CONTOURITE DEPOSITIONAL SYSTEMS 
690 1 0 |a DEPTH RANGE 
690 1 0 |a GEOSCIENCES 
690 1 0 |a KEY FACTORS 
690 1 0 |a LATE PLEISTOCENE-HOLOCENE 
690 1 0 |a PATAGONIA 
690 1 0 |a SEDIMENT SOURCE AREAS 
690 1 0 |a SEDIMENTARY FACIES 
690 1 0 |a SEDIMENTARY PROCESS 
690 1 0 |a WATER DEPTH 
690 1 0 |a WATER MASS 
690 1 0 |a ANOXIC SEDIMENTS 
690 1 0 |a DEPOSITS 
690 1 0 |a GRAVEL 
690 1 0 |a MAGNETIC SUSCEPTIBILITY 
690 1 0 |a SEA LEVEL 
690 1 0 |a SEDIMENTOLOGY 
690 1 0 |a PROCESS CONTROL 
690 1 0 |a CONTINENTAL MARGIN 
690 1 0 |a DEPOSITION 
690 1 0 |a FACIES 
690 1 0 |a GRAIN SIZE 
690 1 0 |a PETROGRAPHY 
690 1 0 |a PLEISTOCENE-HOLOCENE BOUNDARY 
690 1 0 |a SEA LEVEL 
690 1 0 |a SLOPE 
690 1 0 |a WATER DEPTH 
690 1 0 |a WATER MASS 
700 1 |a Violante, R.A. 
700 1 |a Cerredo, M.E. 
773 0 |d 2011  |g v. 31  |h pp. 495-507  |k n. 5-6  |p Geo-Mar. Lett.  |x 02760460  |t Geo-Marine Letters 
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856 4 0 |u https://doi.org/10.1007/s00367-011-0239-x  |y DOI 
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