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

Autor: Antonio Cattaneo, Daniel Aslanian, Benoît Loubrieu, Marina Rabineau, Gwenael Jouet, Bernard Dennielou, Sylvain Bermell, Serge Berné, Isabelle Jégou, Laurence Droz
Přispěvatelé: Laboratoire Environnements Sédimentaires - Géosciences Marines (GM/LES), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Laboratoire Géosciences Océan (LGO), Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Centre de Formation et de Recherche sur les Environnements Méditérranéens (CEFREM), Université de Perpignan Via Domitia (UPVD)-Centre National de la Recherche Scientifique (CNRS), IFREMER, DRO/GM (DRO/GM), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO), Unité de recherche Géosciences Marines (Ifremer) (GM), Institut Français de Recherche pour l'Exploitation de la Mer - Brest (IFREMER Centre de Bretagne), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)
Jazyk: angličtina
Rok vydání: 2019
Předmět:
010504 meteorology & atmospheric sciences
Geochemistry
Canyon
Mass wasting
010502 geochemistry & geophysics
Oceanography
Ebro margin
Turbidite
01 natural sciences
law.invention
Rhone deep-sea fan
Continental margin
Geochemistry and Petrology
law
[SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology
Radiocarbon dating
ComputingMilieux_MISCELLANEOUS
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography
0105 earth and related environmental sciences
[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics
geography
geography.geographical_feature_category
Abyssal plain
Sediment
Geology
Last Glacial Maximum
Gulf of Lions
Sediment routing
[SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology
Channel (geography)
Mass transport deposit
Zdroj: Marine Geology (0025-3227) (Elsevier BV), 2019-05, Vol. 411, P. 1-20
Marine Geology
Marine Geology, Elsevier, 2019, 411, pp.1-20
ISSN: 0025-3227
Popis: 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.
Databáze: OpenAIRE
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