Submarine debris flow deposits detected by long-range side-scan sonar 1,000-kilometers from source |
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| Authors: | Robert W Simm Robert B Kidd |
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| Institution: | 1. Department of Geology, University College London, Gower Street, WC1, London, UK
2. Institute of Oceanographic Sciences, Wormley, GU8 5UB, Godalming, Surrey, UK
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| Abstract: | Debris flow deposits of large aerial extent have been detected on the lower continental rise off northwest Africa using GLORIA long-range dual sidescan sonar. A preliminary interpretation of the sonographs with high-resolution (3.5 kHz) seismic profiles and gravity cores illustrates the potential for spatial mapping of these deposits. The transport directions indicated on the sonographs show that these sediments, emplaced by mass transport, are the downslope continuation of the Saharan Sediment Slide. The distance from an observed “toe” of a debris flow lobe to the most southerly slide scar is of the order of 1,000 km. |
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