Geotechnical characterization and strain analyses of sediment in the Mauritania Slide Complex, NW-Africa

Förster, Annika; Ellis, Richard G; Henrich, Rüdiger; Krastel, Sebastian; Kopf, Achim J

doi:10.1016/j.marpetgeo.2010.02.013

Cited by 24 publications

(5 citation statements)

References 41 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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“…Dating of the undisturbed sediments above the debrite suggests an age of 10.5-10.9 ka for the uppermost mass transport deposit (Wien et al 2007;Henrich et al, 2008). Förster et al (2010) proved the existence of another slide event, which was emplaced at < 24 ka. Seismic data show older buried events, which are not dated.…”

Section: Mauritania Slidementioning

confidence: 92%

“…1). Detailed descriptions are given by Antobreh & Krastel (2007), Henrich et al (2008) and Förster et al (2010). The Mauritania Slide covers an area of about 30,000 km 2 .…”

Section: Mauritania Slidementioning

confidence: 99%

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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“…Sediments are collected from beneath an aqueous layer either directly, using a hand-held device such as a shovel or auger, or indirectly, using a remotely activated device such as a grab sampler, corer, or dredge sampler (Barnett et al 1984;Nelson 1983;Fö rster et al 2010). Grab samplers are designed and employed to collect samples along the horizontal surface.…”

Section: Sampling Of Sedimentsmentioning

confidence: 99%

“…Physical characteristics of the sediments basically include (a) grain-size distribution characteristics (Horowitz and Elrick 1987;Chung et al 2002;Malandrino et al 2009;Grabowski et al 2011); (b) texture (Renjith and Chandramohanakumar 2007;Narayana et al 2008); (c) specific surface area (SSA) (Horowitz and Elrick 1987;Francisca et al 2005); and (d) specific gravity (G). The grain-size distribution (GSD) of the sediments can be obtained by conducting sieve analysis (American Society for Testing and Materials [ASTM] D 422-63 1994;Liu et al 2000;Chung et al 2002;Bianchini et al 2002;Kolay and Singh 2001a;Fö rster et al 2010) and Laser diffraction analysis (Bonnin et al 2005;Malandrino et al 2009;Rogers et al 2011). Table 2 presents a synthesis of literature related to the grain-size distribution characteristics of the sediments retrieved from various water bodies.…”

Section: Physical Characterizationmentioning

confidence: 99%

Characterization of Sediments for Sustainable Development: State of the Art

Sharma

Singh

2014

Marine Georesources & Geotechnology

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Sediments are the particulate matter that are transported by the flow of water and eventually get deposited at the bottom of water bodies, such as oceans, rivers, lagoons, and so forth. The deposition of these materials due to continued intervention of natural as well as anthropogenic activities is a serious concern as the storage capacity (or health) of the system is reduced or otherwise affected. Keeping in view the emerging challenges associated with proper disposal and subsequent utilization of sediments, as a manmade resource, their extraction from such locations becomes necessary. Hence, it is essential to characterize the sediments in order to devise strategies to exploit them as a manmade resource in the best possible manner. With this in view, this article highlights the importance of different attributes and aspects of the sediments (viz., physical, chemical, morphological, geotechnical, toxicological, and microbial characteristics) deposited in the water bodies that will help in assessing their potential as a substitute material to natural resources.

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Geotechnical characterization and strain analyses of sediment in the Mauritania Slide Complex, NW-Africa

Cited by 24 publications

References 41 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

Characterization of Sediments for Sustainable Development: State of the Art

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