Dakar Slide Offshore Senegal, NW-Africa: Interaction of Stacked Giant Mass Wasting Events and Canyon Evolution

Meyer, Mathias; Geersen, Jacob; Krastel, Sebastian; Schwenk, Tilmann; Winkelmann, Daniel

doi:10.1007/978-94-007-2162-3_16

Cited by 6 publications

(4 citation statements)

References 9 publications

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“…Complex (Embley, 1982;Gee et al, 1999;Georgiopoulou et al, 2010), the Mauritania Slide Complex (Antobreh and Krastel, 2007;Henrich et al 2008;Förster et al 2010), the Cap Blanc Slide (Krastel et al, 2006) and the Dakar Slide (Meyer et al, 2012). The Sahara Slide Complex is one of the largest known submarine slides in the world, and affected an area of 48,000 km 2 of the Northwest African Margin (Embley et al, 1982;Fig.…”

Section: Introductionmentioning

confidence: 99%

Morphology, age and sediment dynamics of the upper headwall of the Sahara Slide Complex, Northwest Africa: Evidence for a large Late Holocene failure

Li¹,

Alves

Urlaub

et al. 2017

Marine Geology

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The Sahara Slide Complex in Northwest Africa is a giant submarine landslide with an estimated runout length of ~ 900 km. We present newly acquired high-resolution multibeam bathymetry, sidescan sonar, and sub-bottom profiler data to investigate the seafloor morphology, sediment dynamics and the timing of formation of the upper headwall area of the Sahara Slide Complex. The data reveal a ~35 kmwide upper headwall opening towards the northwest with multiple slide scarps, glide planes, plateaus, lobes, slide blocks and slide debris. The slide scarps in the study area are formed by retrogressive failure events, which resulted in two types of mass movements, translational sliding and spreading. Three different glide planes (GP I, II, and III) can be distinguished approximately 100 m, 50 m and 20 m below the seafloor. These glide planes are widespread and suggest failure along pronounced, continuous weak layers. Our new data suggest an age of only about 2 ka for the failure of the upper headwall area, a date much younger than derived for the landslide deposits on the lower reaches of the Sahara Slide Complex, which are dated at 50-60 ka. The young age of the failure contradicts the postulate of a stable slope off Northwest Africa during times of relative stable sea-level highstands. Such an observation suggests that

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Section: Introductionmentioning

confidence: 99%

Morphology, age and sediment dynamics of the upper headwall of the Sahara Slide Complex, Northwest Africa: Evidence for a large Late Holocene failure

Li¹,

Alves

Urlaub

et al. 2017

Marine Geology

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“…2). The most detailed description of this landslide is given by Meyer et al (2012). The Dakar Slide affected an about 100 km wide area bordered by two large canyon systems, the Diola Canyon in the South and the Dakar Canyon in the north.…”

Section: Dakar Slidementioning

confidence: 99%

“…It runs for about 90 km in an east-west direction and reaches Dakar Canyon at a water depth of about 3900 m. Only small parts of the southern sidewall are imaged. The minimum size of the failed area is ~8000 km 2 (Meyer et al 2012) Dakar Canyon was partially buried by the Dakar Slide downslope of the point at which the northern sidewall meets Dakar Canyon (Fig. 2).…”

Section: Dakar Slidementioning

confidence: 99%

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Mass wasting along the NW African continental margin

Krastel

Urlaub

et al. 2018

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The NW African continental margin is well known for the occurrence of large-scale but infrequent submarine landslides. The aim of this paper is to synthesize the current knowledge on submarine mass wasting off NW Africa with a special focus on the distribution and timing of large landslides. The described area reaches from southern Senegal to the Agadir Canyon. The largest landslides from south to north are the Dakar Slide, the Mauritania Slide, the Cap Blanc Slide, the Sahara Slide and the Agadir Slide. Volumes of individual slides reach several hundreds of cubic kilometres; run-outs are up to 900 km. In addition, giant volcanic debris avalanches are widespread on the flanks of the Canary Islands. All headwall areas are complex with clear indications of multiple failures. The most prominent similarity between all investigated landsides is the existence of widespread glide planes that follow the stratigraphy, which points to weak layers as most important preconditioning factor for the failures. Landslides with volumes larger than 100 m3 are close to being evenly distributed over time, contradicting previous suggestions that landslides off NW Africa occur at periods of low or rising sea level. The risk associated with the landslides off NW Africa, however, is relatively low due to their long recurrence rates.

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Large-scale submarine landslide in the Cochin offshore region, southwestern continental margin of India: a preliminary geophysical understanding

et al. 2022

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Dakar Slide Offshore Senegal, NW-Africa: Interaction of Stacked Giant Mass Wasting Events and Canyon Evolution

Cited by 6 publications

References 9 publications

Morphology, age and sediment dynamics of the upper headwall of the Sahara Slide Complex, Northwest Africa: Evidence for a large Late Holocene failure

Morphology, age and sediment dynamics of the upper headwall of the Sahara Slide Complex, Northwest Africa: Evidence for a large Late Holocene failure

Mass wasting along the NW African continental margin

Large-scale submarine landslide in the Cochin offshore region, southwestern continental margin of India: a preliminary geophysical understanding

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