FN Archimer Export Format PT J TI Quaternary sediment dispersal in the Zambezi turbidite system (SW Indian Ocean) BT AF Fierens, Ruth Toucanne, Samuel Droz, Laurence Jouet, Gwenael Raisson, François Jorissen, Elisabeth L. Bayon, Germain Giraudeau, Jacques Jorry, Stephan AS 1:1;2:2;3:1;4:2;5:3;6:1;7:2;8:4;9:2; FF 1:;2:PDG-REM-GM-LGS;3:;4:PDG-REM-GM-LGS;5:;6:;7:PDG-REM-GM-LGS;8:;9:PDG-REM-GM-LGS; C1 IUEM-UBO-CNRS, UMR6538, Laboratoire Géosciences Océan, 29280 Plouzané, France IFREMER Centre Bretagne, Unité de Recherche Géosciences Marines, 29280 Plouzané, France Total, Centre Scientifique et Technique Jean Féger, 64000 Pau, France EPOC, UMR 5805, Université de Bordeaux, CNRS, 33615 Pessac CEDEX, France C2 CNRS, FRANCE IFREMER, FRANCE TOTAL-CSTJF, FRANCE UNIV BORDEAUX, FRANCE SI BREST SE PDG-REM-GM-LGS UM LGO IN WOS Ifremer UPR copubli-france copubli-univ-france IF 3.548 TC 9 UR https://archimer.ifremer.fr/doc/00634/74586/74481.pdf LA English DT Article CR PAMELA-MOZ01 PAMELA-MOZ02 PAMELA-MOZ04 BO L'Atalante Pourquoi pas ? DE ;Zambezi turbidite system;Mozambique Channel;Climate changes;Monsoon;Quaternary;Depocenter shift AB This study investigates the Late Quaternary sediment distribution of the Zambezi turbidite system (Mozambique Channel, Western Indian Ocean) from a set of piston cores that characterizes the sedimentation in the Intermediate Basin and in the proximal and distal parts of the Zambezi Fan. Sedimentological and geochemical analyses permit to define variations in sediment composition, sediment accumulation rates and timing of turbiditic deposits over the past 720 kyr. Our study reveals low sediment inputs and rare turbiditic deposits in the Zambezi turbidite system, and the deep (>2,500 m) Mozambique Channel in general, over the studied time interval. The reconstruction of the terrigenous flux in the upper part of the system suggests monsoon-related precipitation changes as the main forcing for riverine inputs variability in the Zambezi system. However, the occurrence of turbiditic deposits in the cores suggests that there is no genetic link between their triggering and evolving climate and sea-level conditions, thus emphasizing transformation of failed (slide-generated) sediment from the continental slope as the main initiation process for turbidity currents in the Zambezi system. Finally, our data highlight regional-scale changes in sedimentary facies through time, interpreted as successive ‘on-off’ switches in the activity of the distal Zambezi Fan, and by extension, regional-scale depocenter shifts. The last one likely occurred at 350 ± 42 kyr, and is concomitant with a significant increase in terrigenous inputs into the proximal Intermediate Basin. It is speculated that this depocenter shift is related to a major southward migration of the Zambezi delta. PY 2020 PD OCT SO Marine Geology SN 0025-3227 PU Elsevier BV VL 428 UT 000561216500007 DI 10.1016/j.margeo.2020.106276 ID 74586 ER EF