Major modification of sediment routing by a large Mass Transport Deposit in the Gulf of Lions (Western Mediterranean)

Type Article
Date 2019-05
Language English
Author(s) Dennielou BernardORCID1, Jegou I.1, Droz Laurence2, Jouet Gwenael1, Cattaneo AntonioORCID1, Berné Serge1, 3, Aslanian DanielORCID1, Loubrieu Benoit1, Rabineau MarinaORCID2, Bermell Sylvain1
Affiliation(s) 1 : IFREMER, Centre de Brest, Unité de Recherche Géosciences Marines, 29280 Plouzané, France
2 : UMR 6538 Géosciences Océan, Université de Brest, UBO, Institut Universitaire Européen de la Mer, France
3 : Université de Perpignan, Laboratoire CEFREM, UMR-CNRS 5110, 52 Av. P. Alduy, 66860 Perpignan, France
Source Marine Geology (0025-3227) (Elsevier BV), 2019-05 , Vol. 411 , P. 1-20
DOI 10.1016/j.margeo.2019.01.011
WOS© Times Cited 6
Keyword(s) Gulf of Lions, Ebro margin, Sediment routing, Rhone deep-sea fan, Canyon, Mass transport deposit, Turbidite
Abstract

In the Gulf of Lions (Western Mediterranean), the emplacement of a large (160 km3) Mass Transport Deposit, the Rhone Western Mass Transport Deposit (RWMTD), at the base of slope, aside the Rhone deep-sea fan between 1800 and 2700 m water depth, resulted in a major modification of the sediment routing by clogging a drainage network and blocking at the base of slope sediments that were previously routed into the Valencia channel and the Balearic abyssal plain. The RWMTD was sourced from sediments of the western flank of the Rhone upper fan and the adjacent base of slope. The mass transport deposit is characterized by a transparent seismic facies and sediment cores show that it is composed of a stiff laminated muddy lithofacies characteristic of the Rhone fan turbidites with marked contorted beds indicative of remoulding. AMS radiocarbon dating shows that the RWMTD was emplaced between 19.9 and 21.5 ka cal BP. It is coeval, within dating uncertainties, with the emplacement of a megaturbidite in the Balearic Abyssal Plain and immediately predates a major avulsion of the Rhone turbidite channel that led to the emplacement of an avulsion lobe (the neofan) on top of the RWMTD. It is not possible to affirm a genetic link between these three major gravity events but one can argue that they share a common forcing in relation with massive turbiditic accumulation during the last sea-level lowstand at the end of the Last Glacial Maximum. This study outlines the importance of mass transport deposits in the building of turbidite systems and, more generally, the major control of mass wasting on the routing and dispersal of sediments across continental margins.

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Dennielou Bernard, Jegou I., Droz Laurence, Jouet Gwenael, Cattaneo Antonio, Berné Serge, Aslanian Daniel, Loubrieu Benoit, Rabineau Marina, Bermell Sylvain (2019). Major modification of sediment routing by a large Mass Transport Deposit in the Gulf of Lions (Western Mediterranean). Marine Geology, 411, 1-20. Publisher's official version : https://doi.org/10.1016/j.margeo.2019.01.011 , Open Access version : https://archimer.ifremer.fr/doc/00480/59175/