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Abstract:

The aim of the present study was to characterise the morpho-sedimentary features and main stratigraphic stacking pattern off the Tierra del Fuego continental margin, the north-western sector of the Scotia Sea abyssal plain (Yaghan Basin) and the Malvinas/Falkland depression, based on single- and multi-channel seismic profiles. Distinct contourite features were identified within the sedimentary record from the Middle Miocene onwards. Each major drift developed in a water depth range coincident with a particular water mass, contourite terraces on top of some of these drifts being associated with interfaces between water masses. Two major palaeoceanographic changes were identified. One took place in the Middle Miocene with the onset of Antarctic Intermediate Water flow and the enhancement of Circumpolar Deep Water (CDW) flow, coevally with the onset of Weddell Sea Deep Water flow in the Scotia Sea. Another palaeoceanographic change occurred on the abyssal plain of the Yaghan Basin in the Late Miocene as a consequence of the onset of Southeast Pacific Deep Water flow and its complex interaction with the lower branch of the CDW. Interestingly, these two periods of change in bottom currents are coincident with regional tectonic episodes, as well as climate and Antarctic ice sheet oscillations. The results convincingly demonstrate that the identification of contourite features on the present-day seafloor and within the sedimentary record is the key for decoding the circulation of water masses in the past. Nevertheless, further detailed studies, especially the recovery of drill cores, are necessary to establish a more robust chronology of the evolutionary stages at the transition between the western Scotia Sea and the southern South Atlantic Ocean. © 2015, Springer-Verlag Berlin Heidelberg.

Registro:

Documento: Artículo
Título:Erosional and depositional contourite features at the transition between the western Scotia Sea and southern South Atlantic Ocean: links with regional water-mass circulation since the Middle Miocene
Autor:Pérez, L.F.; Hernández-Molina, F.J.; Esteban, F.D.; Tassone, A.; Piola, A.R.; Maldonado, A.; Preu, B.; Violante, R.A.; Lodolo, E.
Filiación:Instituto Andaluz de Ciencias de la Tierra, Avda. de las Palmeras 4, Armilla, Granada 18100, Spain
Department of Earth Sciences, Royal Holloway University of London, Egham, Surrey TW20 0EX, United Kingdom
Instituto de Geociencias Básicas, Ambientales, Aplicadas, Departamento de Ciencias Geológicas, University of Buenos Aires, Buenos Aires, Argentina
Servicio de Hidrografía Naval, Montes de Oca 2124, Buenos Aires, C1270ABV, Argentina
Chevron Upstream Europe, Chevron North Sea Ltd, Seafield House, Aberdeen, AB15 6XL, United Kingdom
Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, Sgonico, Trieste 34010, Italy
Geophysical Department, Geological Survey of Denmark and Greenland, Øester Voldgade 10, Copenhagen K, 1350, Denmark
Palabras clave:Charge density waves; Climate change; Hydraulics; Oceanography; Sedimentology; Stratigraphy; Antarctic ice sheets; Antarctic intermediate waters; Continental margin; Evolutionary stage; Multi-channel seismic; Regional tectonics; Sedimentary records; Weddell sea deep waters; Flow of water; abyssal plain; continental margin; contourite; depositional environment; erosion; geological record; intermediate water; Miocene; oceanic circulation; paleoceanography; seafloor; stratigraphy; water flow; Atlantic Ocean; Atlantic Ocean (South); Falkland Islands (Malvinas); Scotia Sea; Tierra del Fuego [(ISG) South America]
Año:2015
Volumen:35
Número:4
Página de inicio:271
Página de fin:288
DOI: http://dx.doi.org/10.1007/s00367-015-0406-6
Título revista:Geo-Marine Letters
Título revista abreviado:Geo-Mar. Lett.
ISSN:02760460
CODEN:GMLED
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02760460_v35_n4_p271_Perez

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Citas:

---------- APA ----------
Pérez, L.F., Hernández-Molina, F.J., Esteban, F.D., Tassone, A., Piola, A.R., Maldonado, A., Preu, B.,..., Lodolo, E. (2015) . Erosional and depositional contourite features at the transition between the western Scotia Sea and southern South Atlantic Ocean: links with regional water-mass circulation since the Middle Miocene. Geo-Marine Letters, 35(4), 271-288.
http://dx.doi.org/10.1007/s00367-015-0406-6
---------- CHICAGO ----------
Pérez, L.F., Hernández-Molina, F.J., Esteban, F.D., Tassone, A., Piola, A.R., Maldonado, A., et al. "Erosional and depositional contourite features at the transition between the western Scotia Sea and southern South Atlantic Ocean: links with regional water-mass circulation since the Middle Miocene" . Geo-Marine Letters 35, no. 4 (2015) : 271-288.
http://dx.doi.org/10.1007/s00367-015-0406-6
---------- MLA ----------
Pérez, L.F., Hernández-Molina, F.J., Esteban, F.D., Tassone, A., Piola, A.R., Maldonado, A., et al. "Erosional and depositional contourite features at the transition between the western Scotia Sea and southern South Atlantic Ocean: links with regional water-mass circulation since the Middle Miocene" . Geo-Marine Letters, vol. 35, no. 4, 2015, pp. 271-288.
http://dx.doi.org/10.1007/s00367-015-0406-6
---------- VANCOUVER ----------
Pérez, L.F., Hernández-Molina, F.J., Esteban, F.D., Tassone, A., Piola, A.R., Maldonado, A., et al. Erosional and depositional contourite features at the transition between the western Scotia Sea and southern South Atlantic Ocean: links with regional water-mass circulation since the Middle Miocene. Geo-Mar. Lett. 2015;35(4):271-288.
http://dx.doi.org/10.1007/s00367-015-0406-6