Geological overview of the Angola-Congo margin, the Congo deep-sea fan and its submarine valleys

Type Article
Date 2009-11
Language English
Author(s) Savoye Bruno2, Babonneau Nathalie1, 3, Dennielou BernardORCID2, Bez Martine4
Affiliation(s) 1 : Univ Brest, CNRS, UMR Domaines Ocean 6538, IUEM, F-29280 Plouzane, France.
2 : IFREMER, Environm Sedimentaires Lab, F-29280 Plouzane, France.
3 : Univ Europeenne Bretagne, F-29280 Plouzane, France.
4 : TOTAL, F-64018 Pau, France.
Source Deep Sea Research Part Ii Topical Studies In Oceanography (0967-0645) (Pergamon-elsevier Science Ltd), 2009-11 , Vol. 56 , N. 23 , P. 2169-2182
DOI 10.1016/j.dsr2.2009.04.001
WOS© Times Cited 95
Keyword(s) Congo Angola margin, Congo channel, Sedimentary deposits, Turbidite
Abstract The Congo deep-sea fan is one of the largest fans in the world still affected by presently active turbidity currents. The present activity of deep-sea sedimentary processes is linked to the existence of a direct connection between the Congo River estuary and the Congo canyon head that allows relatively continuous sediment feeding of the deep-sea environment, in spite of a wide continental shelf (150 km). Because of this important activity in terms of sedimentary processes, the deep-sea environment of the Congo-Angola margin presents major interests concerning physical, chemical and biological studies near the seafloor. The main aim of this paper is to present the initial geological context of the BioZaire Program, showing a synthesis of the major results of the ZaiAngo Project including (1) the brief geological setting of the Congo-Angola margin, (2) the structure of the modern Congo deep-sea fan, (3) the sedimentary architecture of the recent Congo turbidite system (from the canyon to the distal lobes) and (4) the recent and present turbidite sedimentation. In order to provide useful information and advice relevant to biological and geochemical studies across the Congo sedimentary system, this article is particularly focused on the present sedimentary processes and the present activity of turbidity current along the Congo canyon and channel.
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