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

Published online by Cambridge University Press:  20 January 2017

Hendrik Lantzsch ,
Till J.J. Hanebuth ,
Cristiano M. Chiessi ,
Tilmann Schwenk  and
Roberto A. Violante
Hendrik Lantzsch*
Affiliation:
MARUM — Center for Marine Environmental Sciences and Faculty of Geosciences, University of Bremen, P.O. Box 330 440, 28334 Bremen, Germany
Till J.J. Hanebuth
Affiliation:
MARUM — Center for Marine Environmental Sciences, University of Bremen, Germany
Cristiano M. Chiessi
Affiliation:
School of Arts, Sciences and Humanities, University of Sao Paulo, Brazil
Tilmann Schwenk
Affiliation:
MARUM — Center for Marine Environmental Sciences and Faculty of Geosciences, University of Bremen, Germany
Roberto A. Violante
Affiliation:
Servicio de Hidrografía Naval, Buenos Aires, Argentina
*
*Corresponding author. Fax: + 49 421 218 65219. E-mail address:[email protected] (H. Lantzsch).
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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-14C 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.

Keywords

Marine depocentersSedimentary pathwaysCurrent controlSource to sinkSoutheastern South AmericaSouthwest AtlanticWater massesLate Quaternary
Type
Research Article
Information
Quaternary Research , Volume 81 , Issue 2 , March 2014 , pp. 339 - 354
Copyright
University of Washington

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