Processus de transfert des éléments volcanodétritiques dans les plaines abyssales autour de l'Île de la Réunion (océan Indien) : exemple du système turbiditique de Cilaos

TL;DRAbstract

Even if deep-water turbidite systems have been widely studied throughout the world ocean, volcaniclastic deep-sea fans are little known compared to silicoclastic systems. Numerous studies dedicated to the Canary or the Hawaii Islands have never revealed the presence of well-developed turbidite system (with canyons, lobes and levees). Nevertheless, turbidite deposits and sedimentary structures like canyons or channels are visible off these volcanic islands suggesting that other processes than large mass wasting processes (flank landslides, debris avalanches) also played an important role in the erosion and transport of sediments in the deep marine environment adjacent to volcanic islands.\nThe new dataset collected off La Réunion Island, during the 2006 cruises FOREVER and ERODER1 and the 2008 ERODER 2, reveals for the first time the presence of five large turbidite systems extending to more than 200 km from the island. The results presented in this PhD thesis propose a reconstruction o

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