Duarte, J.C., Terrinha, P., Rosas, F.M., Valadares, V., Pinheiro, L.M., Matias, L., Magalhães, V. and Roque, C. (2010) Crescent-shaped morphotectonic features in the Gulf of Cadiz (offshore SW Iberia). Marine Geology, 271 (3-4). pp. 236-249. DOI 10.1016/j.margeo.2010.02.017.

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Abstract

Multibeam swath bathymetry data from the Northwestern part of the Gulf of Cadiz revealed the existence of several intriguing kilometric crescentic depressions lying between -4300 m and -4700 m, never before reported to occur at such great depths. Morphological parameterization of these features, coupled with a detailed analysis of multi-channel and middle resolution seismic profiles, showed that these crescent-shaped features were formed due to the existence of specific time-recurrent interaction between: a) regional active thrusts, which portray the overall tectonic scenario in the area, and on top of which most crescentic depressions are carved; and b) tectonically induced scouring comprising localized erosion and simultaneous progradational sedimentation, produced by downslope currents of probable turbiditic origin. The obtained results also suggest a possible contribution of fluid migration and extrusion processes, such as mud volcanism and associated pockmark formation, besides gravity driven landslides and slumping, in the development of the studied crescentic depressions

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