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Channels, canyons and slump folds on continental slope between southwest ireland and spain

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Gauthier-Villars
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Abstract

Channels, canyons and slump folds on the continental slope between South-West Ireland and Spain OCEANOLOGICA ACTA.1978- VOL. 1 - N° 3 ~ --,---------~- Channels, canyons Canyons Gullies Slump folds Continental slope Sonographs and slump folds on Canyons Ravins Plis de glissement Pente continentale Sonographes the continental slope between South-West lreland and Spain ABSTRACT RÉSUMÉ N. H. Ken yon, R. H. Belderson, A. H. Stride Institute of Oceanographie Sciences, Wormley, Godalming, Surrey, England. Received 27/12/77, in revised form 1/3/78, accepted 10/3/78. Long-range sonographs provide plan view data relevant to the morphology of the continental slope between South-West lreland and Spain. The relief viewed in this way includes: (1) sinuous flat-bottomed channels, 100-280 rn deep and 1-5 km wide, flanked by terraces and developed on an half degree slope in the Porcupine Seabight; (2) the deeply canyoned, gullied and slumped continental slope West of the Celtic Sea and the · Annorican Shelf, where the overall slope is from about 5 to 9°, with sorne remuants of undissected slope, and (3) numerous slump folds with wavelengths of 1 . 5 to 2. 5 km that are developed on slopes of 3 to 5° bordering onto the Landes Marginal Plateau. The upper reaches of the canyons are notable for abundant dendritic side-gullies, which contrast with the ungullied sinuous channels and slump folds found elsewhere. Many of the canyons trend obliquely down-slope and have sharp changes in direction, indicating structural control. Within the area studied the steepness of the continental slope seems to be the dominant factor in determining its morphology. Oceanol. Acta, 1978, 1, 3, 369-380. Chenaux, canyons, et plis de glissement sur la pente continentale entre le sud-ouest de l'Irlande et l'Espagne Le sonar latéral à grand rayon d'action fournit de nouvelles données sur la morphologie de la pente continentale entre le sud-ouest de l'Irlande et l'Espagne. Grâce à ce

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