Direct observation of intense turbidity current activity in the Zaire submarine valley at 4000 m water depth

Type Article
Date 2003-03
Language English
Author(s) Khripounoff AlexisORCID, Vangriesheim Annick, Babonneau Nathalie, Crassous Philippe, Dennielou BernardORCID, Savoye Bruno
Affiliation(s) IFREMER, Dept Environm Profond, F-29280 Plouzane, France.
IFREMER, Dept Geosci Marines, F-29280 Plouzane, France.
Source Marine Geology (0025-3227) (Elsevier), 2003-03 , Vol. 194 , N. 3-4 , P. 151-158
DOI 10.1016/S0025-3227(02)00677-1
WOS© Times Cited 191
Keyword(s) West equatorial Africa, Particle composition, Particle flux, Zaire channel, Turbidity current
Abstract A large turbidity current was detected in the Zaire submarine valley at 4000 m water depth. Current meters, turbidimeter and sediment trap deployed on a mooring located in the channel axis, although they were damaged, recorded the signature of a very high energy event. An average velocity of more than 121 cm s-1 was measured 150 m above the channel floor. Coarse sand and plant debris were collected at 40 m height. The turbidity current clearly overflowed the edges of the valley as demonstrated by the large quantity of turbiditic material (464 mg organic carbon m-2 d-1) found in the sediment trap moored 13 km south from the channel axis.
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