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Tectonic shortening and gravitational spreading in the Gulf of Cadiz accretionary wedge: Observations from multi-beam bathymetry and seismic profiling

AuthorsGutscher, Marc-André; Dominguez, Stephane; Westbrook, Graham K.; Gente, Pascal; Babonneau, Nathalie; Mulder, Thierry; Gonthier, Eliane; Bartolomé, Rafael ; Luis, Joaquim; Rosas, Filipe; Terrinha, Pedro; DELILA Scientific Team; DelSis Scientific Team
Accretionary wedge
Gravitational spreading
Issue DateMay-2009
CitationMarine and Petroleum Geology 26(5): 647-659 (2009)
AbstractThe Gulf of Cadiz lies astride the complex plate boundary between Africa and Eurasia west of the Betic-Rif mountain belt. We report on the results of recent bathymetric swathmapping and multi-channel seismic surveys carried out here. The seafloor is marked by contrasting morphological provinces, spanning the SW Iberian and NW Moroccan continental margins, abyssal plains and an elongate, arcuate, accretionary wedge. A wide variety of tectonic and gravitational processes appear to have shaped these structures. Active compressional deformation of the wedge is suggested by folding and thrusting of the frontal sedimentary layers as well as basal duplexing in deeper internal units. There is evidence for simultaneous gravitational spreading occurring upslope. The very shallow mean surface and basal slopes of the accretionary wedge (1° each) indicate a very weak decollement layer, geometrically similar to the Mediterranean Ridge accretionary complex. Locally steep slopes (up to 10°) indicate strongly focused, active deformation and potential gravitational instabilities. The unusual surface morphology of the upper accretionary wedge includes "raft-tectonics" type fissures and abundant sub-circular depressions. Dissolution and/or diapiric processes are proposed to be involved in the formation of these depressions.
Description13 pages, 13 figures.-- Available online Jul 31, 2008.-- Issue title: "Thematic Set on New Insights on Slope Instabilities from Recent Studies within the French Margin Program GDR Marges".
Full-text version available Open Access at: http://www.igm.ineti.pt/MULTIMEDIA/ASSOCIA/BASE%20MONO/33208.PDF
Publisher version (URL)http://dx.doi.org/10.1016/j.marpetgeo.2007.11.008
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