Crescent-shaped morphotectonic features in the Gulf of Cadiz (offshore SW Iberia)

Autor: Belin Jude, Pedro Terrinha, Behzad Nazemroaya, Anwar Shidiq, Luis Matias, Joao Duarte, Luis Menezes Pinheiro, Filipe Rosas, BHAVANI SANKAR, ‪AQEEL ATTABY, Manmohan Sharma, Cristina Roque, Arash Issaee, Adi Mursalin, Vitor Magalhaes, Andi Mallanti
Rok vydání: 2010
Předmět:
Zdroj: Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
ISSN: 0025-3227
DOI: 10.1016/j.margeo.2010.02.017
Popis: 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.
Databáze: OpenAIRE
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