FN Archimer Export Format PT J TI Discovery of a giant deep-sea valley in the Indian Ocean, off eastern Africa: The Tanzania channel BT AF BOURGET, J. ZARAGOSI, S. GARLAN, T. GABELOTAUD, I. GUYOMARD, P. DENNIELOU, Bernard ELLOUZ-ZIMMERMANN, N. SCHNEIDER, J. L. AS 1:1;2:1;3:2;4:2;5:2;6:4;7:3;8:1; FF 1:;2:;3:;4:;5:;6:PDG-DOP-DCB-GM-LES;7:;8:; C1 Univ Bordeaux, UMR 5805, F-33405 Talence, France. SHOM, Oceanog Rech CS 92803, F-29928 Brest 2, France. Inst Francais Petr, Rueil Malmaison, France. IFREMER Geosci Marines, Lab Environm Sedimentaires, F-29280 Plouzane, France. C2 UNIV BORDEAUX, FRANCE SHOM, FRANCE IFP, FRANCE IFREMER, FRANCE SI BREST SE PDG-DOP-DCB-GM-LES IN WOS Ifremer jusqu'en 2018 copubli-france copubli-univ-france IF 2.1 TC 22 UR https://archimer.ifremer.fr/doc/00324/43491/42958.pdf LA English DT Article CR FANINDIEN LEG 2 TANZAVAL BO Beautemps-Beaupré DE ;Indian Ocean;East African margin;East African Rift System;Turbidite system;Submarine channel AB During the Fanindien 2006 cruise of R/V 'Beautemps-Beaupre', high resolution multibeam bathymetry, sub-bottom profiling and sediment coring was carried out along the East African margin, offshore Tanzania and Mozambique (Indian Ocean). The newly acquired data reveal the presence of a giant deep-sea valley (the Tanzania channel) that is more than 10 km wide at 4000 m water depth, along the continental rise. The valley remains similar to 70 m deep and 7 km wide at 800 km from the Tanzania coast. Morphological comparison with worldwide submarine channels show that the Tanzania channel is one of the largest known submarine valleys. This discovery brings new light on development of submarine valleys that drain sediments originated from the East African Rift System (EARS) highlands (i.e. the Tanzania channel and its neighbor Zambezi channel located similar to 1000 km southward). Both of the systems have a morphology markedly different to the classical sinuous, V-shaped channels located at similar latitudes (e.g. the Zaire or Amazon channels). Their submarine drainage system consists of a downslope converging tributary canyons joining a central trunk channel in the continental rise. The presence of such giant deep-sea drainage systems is probably linked to a strong structural control on the sediment pathway, associated to a massive sediment transfer towards the Indian Ocean in relation with the tectonic activity of the East African Rift System (i.e. the uplift periods trough mid-Miocene and Plio-Pleistocene times) and its interplay with the East African equatorial climate changes. PY 2008 PD DEC SO Marine Geology SN 0025-3227 PU Elsevier VL 255 IS 3-4 UT 000261702800007 BP 179 EP 185 DI 10.1016/j.margeo.2008.09.002 ID 43491 ER EF