Geological overview of the Angola–Congo margin,the Congo deep-sea fan and its submarine valleys |
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| Institution: | 1. GRC Geociències Marines, Facultat de Geologia, Universitat de Barcelona, E-08028 Barcelona, Spain;2. Department of Physics, University of Malta, Msida, MSD 2080, Malta;3. Institut de Ciències del Mar, CSIC, Passeig Marítim de la Barceloneta 37-49, E-08003 Barcelona, Spain;1. School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK;2. Ocean and Earth Science, University of Southampton, Southampton, UK;3. Monterey Bay Aquarium Research Institute, Moss Landing, CA, USA;1. National Oceanography Centre, European Way, Southampton SO14 3ZH, UK;2. Monterey Bay Aquarium Research Institute, 7700 Sandholt Road, Moss Landing, CA 95039-9644, USA;3. Geological Survey of Canada, Bedford Institute of Oceanography, Dartmouth, Nova Scotia B2Y 4A2, Canada;1. Bureau of Economic Geology, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX, USA;2. Computational Science Research Center, San Diego State University, San Diego, CA, USA;3. Monterey Bay Aquarium Research Institute, Moss Landing, CA, USA;4. Chevron Energy and Technology Company, 1500 Louisiana, Houston, TX, USA;5. Statoil, Research Center, Austin, TX, USA |
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| 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 ZaïAngo 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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