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Geological Society, London, Special Publications; 1984; v. 15; p. 153-167;
DOI: 10.1144/GSL.SP.1984.015.01.10
© 1984 Geological Society of London

Terrigenous Turbidites and Associated Facies

Sedimentation in the southern Cape Verde Basin: seismic and sediment facies

G. A. Auffret, R. Le Suave, R. Kerbrat & B. Sichler

Centre Océanologique de Bretagne, B.P. 337, 29273 Brest, Cedex, France

S. Roy & C. Laj

CNRS-CEA Centre des Faibles Radioactivités, B.P.1, 91190, Gif-sur-Yvette, France

C. Muller

Consultante, 1 rue Martignon, 92500, Rueil Malmaison, France

A detailed seismic and sedimentological study of a small area at the lower continental rise to abyssal plain transition off NW Africa has revealed a complex pattern of Plio-Quaternary sedimentation. The area is one of extremely low relief. However, the sediment facies distribution mirrors the slight morphological expression of basement structures and downslope shallow channels. Fine-grained hemipelagic sediments are dominant throughout, although in some cases the influence of low-density turbidity currents and of bottom currents is observed. Sandy turbidites, up to 2 metres thick in the channels, were emplaced during periods of lowered sea-level.


Contribution 824 du Centre Océanologique de Bretagne.