| Full text | |
| 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: | 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 Opportunities: | Research Program on Global Climate Change - Young Investigators |
| 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 Opportunities: | Regular Research Grants |