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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

The high-supply, current-dominated continental margin of southeastern South America during the late Quaternary

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Author(s):
Lantzsch, Hendrik [1, 2] ; Hanebuth, Till J. J. [1] ; Chiessi, Cristiano M. [3] ; Schwenk, Tilmann [1, 2] ; Violante, Roberto A. [4]
Total Authors: 5
Affiliation:
[1] Univ Bremen, MARUM Ctr Marine Environm Sci, D-28334 Bremen - Germany
[2] Univ Bremen, Fac Geosci, D-28334 Bremen - Germany
[3] Univ Sao Paulo, Sch Arts Sci & Humanities, BR-05508 Sao Paulo - Brazil
[4] Serv Hidrog Naval, Buenos Aires, DF - Argentina
Total Affiliations: 4
Document type: Journal article
Source: Quaternary Research; v. 81, n. 2, p. 339-354, MAR 2014.
Web of Science Citations: 23
Abstract

The continental margin off the La Plata Estuary (SE South America) is characterized by high fluvial sediment supply and strong ocean currents. High-resolution sediment-acoustic data combined with sedimentary facies analysis, AMS-C-14 ages, and neodymium isotopic data allowed us to reconstruct late Quaternary sedimentary dynamics in relation to the two major sediment sources, the La Plata Estuary and the Argentine margin. Sediments from these two provinces show completely different dispersal patterns. We show that the northward-trending La Plata paleo-valley was the sole transit path for the huge volumes of fluvial material during lower sea levels. In contrast, material from the Argentine margin sector was transported northwards by the strong current system. Despite the large sediment volumes supplied by both sources, wide parts of the shelf were characterized by either persistent non-deposition or local short-term depocenter formation. The location and formation history of these depocenters were primarily controlled by the interplay of sea level with current strength and local morphology. The high sediment supply was of secondary importance to the stratigraphic construction, though locally resulting in high sedimentation rates. Thus, the shelf system off the La Plata Estuary can be considered as a hydrodynamic-controlled end-member. (c) 2014 University of Washington. Published by Elsevier Inc. All rights reserved. (AU)

FAPESP's process: 10/09983-9 - Sea surface temperature changes in the Western South Atlantic and precipitation variability in southeastern South America since the Last Glacial Maximum
Grantee:Cristiano Mazur Chiessi
Support type: Regular Research Grants
FAPESP's process: 12/17517-3 - Response of the Western Atlantic Ocean to changes in the Atlantic meridional overturning circulation: from millennial to seasonal variability
Grantee:Cristiano Mazur Chiessi
Support type: Research Program on Global Climate Change - Young Investigators