FN Archimer Export Format PT J TI Contourite and mixed turbidite-contourite systems in the Mozambique Channel (SW Indian Ocean): Link between geometry, sediment characteristics and modelled bottom currents BT AF Miramontes, Elda Thiéblemont, Antoine Babonneau, Nathalie Penven, Pierrick Raisson, François Droz, Laurence Jorry, Stephan Fierens, Ruth Counts, John W. Wilckens, Henriette Cattaneo, Antonio Jouet, Gwenael AS 1:1,2;2:3,4;3:9;4:6;5:3;6:5;7:7;8:5;9:8;10:1,2;11:7;12:7; FF 1:;2:;3:;4:;5:;6:;7:PDG-REM-GM-LGS;8:;9:;10:;11:PDG-REM-GM-LAD;12:PDG-REM-GM-LGS; C1 Faculty of Geosciences, University of Bremen, Bremen 28359, Germany MARUM-Center for Marine Environmental Sciences, University of Bremen, Bremen 28359, Germany TOTAL, R&D Frontier Exploration Program, Avenue Larribau, Pau 64000, France Department of Earth Sciences, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK UMR 6538 CNRS-UBO, IUEM, Laboratoire Géosciences Océan, Plouzané 29280, France UMR 6523 CNRS, IFREMER, IRD, UBO, Laboratoire d'Océanographie Physique et Spatiale, Plouzané, France IFREMER, Géosciences Marines, Plouzané 29280, France USGS Eastern Energy Resources Science Center, MS 956, Reston, VA, USA UMR 6538 CNRS-UBO, IUEM, Laboratoire Géosciences Océan, Plouzané 29280, France C2 UNIV BREMEN, GERMANY UNIV BREMEN MARUM, GERMANY TOTAL, FRANCE UNIV LONDON, UK CNRS, FRANCE IRD, FRANCE IFREMER, FRANCE USGS, USA UBO, FRANCE SI BREST SE PDG-REM-GM-LGS PDG-REM-GM-LAD UM LOPS LGO IN WOS Ifremer UPR WOS Cotutelle UMR copubli-france copubli-p187 copubli-europe copubli-univ-france copubli-int-hors-europe IF 3.627 TC 31 UR https://archimer.ifremer.fr/doc/00693/80472/83601.pdf LA English DT Article CR PAMELA-MOZ01 PAMELA-MOZ02 PAMELA-MOZ03 PAMELA-MOZ04 PAMELA-MOZ05 PTOLEMEE BO L'Atalante Pourquoi pas ? DE ;Bottom current;Contour current;Oceanic circulation;Deep-water environment;Sediment drift;Contourite depositional system AB Oceanic currents can profoundly reshape the seafloor and even modify the characteristics of turbidite systems. Multiple erosional and depositional features directly formed by bottom currents (i.e. contourites), as well as by the interaction between bottom currents and turbidity currents or turbidite systems (i.e. mixed turbidite-contourite systems) have been identified in the Mozambique Channel (SW Indian Ocean) in multibeam bathymetry, seismic reflection data, sub-bottom profiler images and sediment cores. In this study, we characterise the morphology, stacking pattern and sedimentary characteristics of these sedimentary systems, and analysed the properties of bottom currents at these systems using a hydrodynamic numerical model. Modelled bottom currents are the highest at abraded surfaces and moats, but they also display a relatively high variability, suggesting that the observed erosion is not the result of a constant or persistent current but rather of episodes of intense circulation. Modelled bottom currents at contourite terraces are not significantly different from currents at related plastered drifts, where accumulation is enhanced. The formation of contourite terraces can thus not solely be explained by the mean oceanic circulation and eddies, implying that other processes such as internal waves may play a relevant role in their formation. Three different types of mixed turbidite-contourite systems were observed: one characterised by asymmetric channel-levee systems formed by the synchronous interaction of bottom currents and turbidity currents, one characterised by a phased interaction that resulted in the erosion of the channel flanks by bottom currents, and another one in which both synchronous and phased interaction played a relevant role in the evolution of the system. Finally, we propose a simplified classification of contourites that can be applied to any contourite system worldwide, and that comprises erosional and depositional features, including muddy and sandy contourite deposits. PY 2021 PD JUN SO Marine Geology SN 0025-3227 PU Elsevier BV VL 437 UT 000659163500009 DI 10.1016/j.margeo.2021.106502 ID 80472 ER EF