FN Archimer Export Format
PT J
TI Late Holocene current patterns in the northern Patagonian fjords recorded by sediment drifts in Aysén Fjord
BT 
AF Wils, Katleen
   Wermersche, Marlies
   Van Rooij, David
   Lastras, Galderic
   Lamy, Frank
   Arz, Helge W.
   Siani, Giuseppe
   Bertrand, Sebastien
   Van Daele, Maarten
AS 1:1;2:1;3:1;4:2;5:3;6:4;7:5;8:1;9:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;
C1 Renard Centre of Marine Geology (RCMG), Department of Geology, Ghent University, Ghent, Belgium
   GRC Geociències Marines, Universitat de Barcelona, Barcelona, Spain
   Alfred Wegener Institut für Polar- und Meeresforschung, Bremerhaven, Germany
   Leibniz Institute for Baltic Sea Research Warnemünde (IOW), Rostock-Warnemünde, Germany
   GEOPS, UMR 8148 Université de Paris-Saclay, Orsay, France
C2 UNIV GHENT, BELGIUM
   UNIV BARCELONA, SPAIN
   INST A WEGENER, GERMANY
   LEIBNIZ INST BALT SEA RES (IOW), GERMANY
   UNIV PARIS SACLAY, FRANCE
IF 3.627
TC 1
UR https://archimer.ifremer.fr/doc/00718/82990/88252.pdf
LA English
DT Article
CR MD159 / PACHIDERME
BO Marion Dufresne
DE ;Patagonia;Sediment drift;Bottom current circulation;Climatic variability;Tectonic control
AB Present-day circulation patterns in the southeastern Pacific Ocean are driven by the Antarctic Circumpolar Current, directing subantarctic surface water into the Patagonian fjords since at least the early Holocene. In this way, bottom current patterns in the area are regulated by the regional climate, although the complex bathymetry of the fjords has a significant impact as well. To understand the potential interplay of climate, seafloor topography-and circulation patterns, we study the sedimentary infill of Aysén Fjord (~45°S) and reveal the first active sediment drifts in the region. These allow constraining the present-day circulation patterns in northern Patagonia and show an incoming (southward) as well as returning (northward) flow direction. While the general sedimentary evolution of the fjord (and thus also the sediment drifts) is climate-driven (i.e., it reflects variability in southern westerly wind strength), the onset of drift formation at ~3.7 ka does not seem to have originated from an abrupt change in regional climate. Instead, we propose that a megathrust earthquake described in paleoseismic records in the area could have resulted in subsidence of one (or more) of the many bathymetric highs in the Patagonian fjords, thus contributing to enhanced spilling of subantarctic water into the fjord. This study underscores the importance of multidisciplinary research to understand past and present bottom current circulation patterns and disentangle different possible feedback mechanisms. 
PY 2021
PD NOV
SO Marine Geology
SN 0025-3227
PU Elsevier BV
VL 441
UT 000697734600006
DI 10.1016/j.margeo.2021.106604
ID 82990
ER

EF