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Fluid escape structures in the Gulf of Cadiz. Evidence of structural control from combined seismic reflection and sidescan sonar interpretation Magalhães, V.H.; Pinheiro, L.M.; Van Rensbergen, P.; Roque, C.; Léon-Buendia, R.; Bouriak, S.; Kopf, A.; Gardner, J.; Ivanov, M. (2004). Fluid escape structures in the Gulf of Cadiz. Evidence of structural control from combined seismic reflection and sidescan sonar interpretation. Geophys. Res. Abstr. 6: 05031 In: Geophysical Research Abstracts. Copernicus: Katlenburg-Lindau. ISSN 1029-7006; e-ISSN 1607-7962

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Beschikbaar in	Auteurs
VLIZ: Open access 228033 [ download pdf ]
Documenttype: Samenvatting

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Trefwoord

Marien/Kust

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Auteurs		Top
Magalhães, V.H. Pinheiro, L.M. Van Rensbergen, P.	Roque, C. Léon-Buendia, R. Bouriak, S.	Kopf, A. Gardner, J. Ivanov, M.

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Abstract

The Gulf of Cadiz is situated in a tectonically complex and active region, close to a major plate boundary. The tectonic regime in the area is characterized by a combination of important strike-slip movement and compressional tectonics related to the Africa-Eurasia NW-directed convergence, responsible for the formation of the Gibraltar Arc. Extensive mud volcanism, pockmarks, mud diapirism and carbonate chimneys related to hydrocarbon rich fluid venting are observed throughout the area. There is an extensive coverage of seismic reflection profiles in the area that includes industry data, a few deep-multichannel lines (IAM, ARRIFANO and BIGSETS) and many single-channel lines (both Sparker and Airgun data). During the TTR-12 (July/2002) and the GAP (Nov-Dec/2003) cruises, several single and multi channel seismic lines were acquired in this area that complement the existing database collected during previous TTR Cruises. These lines have re-processed to enhance the deeper structure.A combined interpretation of the available side-scan sonar imaging obtained by the Naval Research Laboratory in 1992 and the available seismic lines (both single channel and multichannel) shows clear evidence of the structural control of the mud volcanism in the study area. In particular, it appears that some of the mud volcanoes are located at the intersection between NW-SE strike-slip faults and thrusts of variable orientation, reflecting the curvature of the Gibraltar Arc.

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