Age models for the Cape Blanc Debris Flow and the Mauritania Slide Complex in the Atlantic Ocean off NW Africa |
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| Institution: | 1. Institut für Geowissenschaften, Universität Friedrich-Schiller Jena, Burgweg 11, 07749 Jena, Germany;2. Institut für Geophysik, Universität Hamburg, Bundesstraße 55, 20146 Hamburg, Germany;3. FB Geowissenschaften, Universität Bremen, Postfach 330 440, D-28334 Bremen, Germany;4. FUGRO OSAE GmbH, 28359 Bremen, Germany;5. School of Environment, University of Auckland, Private Bag 92091, Auckland 1142, New Zealand;1. GeoZentrum Nordbayern, Universität Erlangen-Nürnberg, Schloßgarten 5a, 91054 Erlangen, Germany;2. Earth and Planetary Sciences, McGill University, 3450 University Street, H3A 2A7 Montreal, QC, Canada;3. Department of Geology, University of Fort Hare, Private Bag X1314, Alice 5700, South Africa |
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| Abstract: | Age models for the emplacement time of mass flow deposits from the Cape Blanc Debris Flow, the Mauritania Slide Complex and a levee of the Mauritania Canyon were obtained by offshore X-ray fluorescence (XRF) element stratigraphy on five gravity cores, allowing the assessment of slope instability in this part of the NW African continental margin with respect to climate-related sea-level variations during the Quaternary. The Cape Blanc Debris Flow emplaced approximately 155 kyr ago whereas deposition of the Mauritania Slide Complex is linked to the rapid sea-level rise at the Pleistocene/Holocene boundary. Turbidites on a levee of the Mauritania Canyon close to the Mauritania Slide Complex occurred at stage boundaries. These findings agree with other studies which show that the NW African continental margin has been unstable over the last Quaternary cycles, and that downslope sediment transport is frequently coupled to periods of climatic changes at stage boundaries. |
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