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Abstract:

The Mar del Plata Canyon is located at the continental margin off northern Argentina in a key intermediate and deep-water oceanographic setting. In this region, strong contour currents shape the continental margin by eroding, transporting and depositing sediments. These currents generate various depositional and erosive features which together are described as a Contourite Depositional System (CDS). The Mar del Plata Canyon intersects the CDS, and does not have any obvious connection to the shelf or to an onshore sediment source. Here we present the sedimentary processes that act in the canyon and show that continuous Holocene sedimentation is related to intermediate-water current activity. The Holocene deposits in the canyon are strongly bioturbated and consist mainly of the terrigenous "sortable silt" fraction (10-63. μm) without primary structures, similarly to drift deposits. We propose that the Mar del Plata Canyon interacts with an intermediate-depth nepheloid layer generated by the northward-flowing Antarctic Intermediate Water (AAIW). This interaction results in rapid and continuous deposition of coarse silt sediments inside the canyon with an average sedimentation rate of 160. cm/kyr during the Holocene. We conclude that the presence of the Mar del Plata Canyon decreases the transport capacity of AAIW, in particular of its deepest portion that is associated with the nepheloid layer, which in turn generates a change in the contourite deposition pattern around the canyon. Since sedimentation processes in the Mar del Plata Canyon indicate a response to changes of AAIW contour-current strength related to Late Glacial/Holocene variability, the sediments deposited within the canyon are a great climate archive for paleoceanographic reconstructions. Moreover, an additional involvement of (hemi) pelagic sediments indicates episodic productivity events in response to changes in upper ocean circulation possibly associated with Holocene changes in intensity of El Niño/Southern Oscillation. © 2013 Elsevier B.V.

Registro:

Documento: Artículo
Título:A submarine canyon as a climate archive - Interaction of the antarctic intermediate water with the mar del plata canyon (southwest atlantic)
Autor:Voigt, I.; Henrich, R.; Preu, B.M.; Piola, A.R.; Hanebuth, T.J.J.; Schwenk, T.; Chiessi, C.M.
Filiación:MARUM - Center for Marine Environmental Sciences, University of Bremen, D-28203 Bremen, Germany
MARUM - Center for Marine Environmental Sciences, Faculty of Geosciences, University of Bremen, Germany
Servicio de Hidrografia Naval (SHN), Buenos Aires, Argentina
Dept. Ciencias de la Atmósfera y los Océanos, FCEN, Universidad de Buenos Aires and Instituto Franco-Argentino sobre, Estudios de Clima y sus Impactos, CNRS/CONICET, Argentina
School of Arts Sciences and Humanities, University of São Paulo, Brazil
Chevron Upstream Europe, Chevron North Sea Limited, Aberdeen AB15 6XL, United Kingdom
Palabras clave:Antarctic Intermediate Water; Drift deposition; El Niño/Southern Oscillation (ENSO); Southwest Atlantic; Submarine Canyon; Antarctic intermediate waters; Continuous deposition; Contourite depositional systems; Drift deposition; Sedimentation process; Southwest Atlantic; Submarine canyon; Upper ocean circulation; Deposits; Sedimentation; Sedimentology; Silt; Submarines; Sediments; Antarctic Intermediate Water; bioturbation; continental margin; El Nino-Southern Oscillation; episodic event; Holocene; late glacial; nepheloid layer; paleoceanography; paleoclimate; pelagic deposit; sediment transport; sedimentation; silt; submarine canyon; upper ocean; Argentina; Buenos Aires [Argentina]; Mar del Plata Harbor; Pacific Ocean; Pacific Ocean (Southwest)
Año:2013
Volumen:341
Página de inicio:46
Página de fin:57
DOI: http://dx.doi.org/10.1016/j.margeo.2013.05.002
Título revista:Marine Geology
Título revista abreviado:Mar. Geol.
ISSN:00253227
CODEN:MAGEA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00253227_v341_n_p46_Voigt

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Citas:

---------- APA ----------
Voigt, I., Henrich, R., Preu, B.M., Piola, A.R., Hanebuth, T.J.J., Schwenk, T. & Chiessi, C.M. (2013) . A submarine canyon as a climate archive - Interaction of the antarctic intermediate water with the mar del plata canyon (southwest atlantic). Marine Geology, 341, 46-57.
http://dx.doi.org/10.1016/j.margeo.2013.05.002
---------- CHICAGO ----------
Voigt, I., Henrich, R., Preu, B.M., Piola, A.R., Hanebuth, T.J.J., Schwenk, T., et al. "A submarine canyon as a climate archive - Interaction of the antarctic intermediate water with the mar del plata canyon (southwest atlantic)" . Marine Geology 341 (2013) : 46-57.
http://dx.doi.org/10.1016/j.margeo.2013.05.002
---------- MLA ----------
Voigt, I., Henrich, R., Preu, B.M., Piola, A.R., Hanebuth, T.J.J., Schwenk, T., et al. "A submarine canyon as a climate archive - Interaction of the antarctic intermediate water with the mar del plata canyon (southwest atlantic)" . Marine Geology, vol. 341, 2013, pp. 46-57.
http://dx.doi.org/10.1016/j.margeo.2013.05.002
---------- VANCOUVER ----------
Voigt, I., Henrich, R., Preu, B.M., Piola, A.R., Hanebuth, T.J.J., Schwenk, T., et al. A submarine canyon as a climate archive - Interaction of the antarctic intermediate water with the mar del plata canyon (southwest atlantic). Mar. Geol. 2013;341:46-57.
http://dx.doi.org/10.1016/j.margeo.2013.05.002