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

被引:247
作者
Khripounoff, A
Vangriesheim, A
Babonneau, N
Crassous, P
Dennielou, B
Savoye, B
机构
[1] IFREMER, Dept Environm Profond, F-29280 Plouzane, France
[2] IFREMER, Dept Geosci Marines, F-29280 Plouzane, France
关键词
turbidity current; Zaire channel; particle flux; particle composition; west equatorial Africa;
D O I
10.1016/S0025-3227(02)00677-1
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
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. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:151 / 158
页数:8
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