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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The El Arraiche mud volcano field at the Moroccan Atlantic slope, Gulf of Cadiz
Marine Geology, Volume 219, No. 1, Year 2005
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Description
The El Arraiche field is a new mud volcano field discovered near the Moroccan shelf edge in the Gulf of Cadiz that consists of 8 mud volcanoes in water depths from 200 to 700 m. The largest mud volcano in the field (Al Idrissi mud volcano) is 255 m high and 5.4 km wide. The cluster was discovered during a survey with the RV Belgica and studied further during Leg 2 of the TTR 12 survey onboard the R/V Prof Logachev. The 2002 surveys yielded detailed multibeam bathymetry over a 700 km2 study area, dense grids of high-resolution seismic data, deep-tow sub bottom profiles, sidescan sonar mosaics over the major structures. Selected video imagery lines, video guided grab samples, dredge samples, gravity cores, and box cores were collected for groundtruthing purposes. Eight mud volcanoes in water depths from 200 to 700 m cluster around two, sub-parallel anticlines and associated active extensional faults. Rock clasts and regional seismic data locate the El Arraiche field over a Late Miocene-Pliocene extensional basin. The onset of mud volcanic activity is estimated at about 2.4 Ma and probably roots in the Cretaceous-Miocene accretionary wedge. Stacked outflows are visible up to a depth of about 500 m below the sea floor. The occurrence of long-lived mud volcanoes bear witness to continued overpressure generation at depth, either by in situ oil and gas generation or by focussed flow and accumulation in the area. Geochemical analyses of pore water from cores demonstrate the presence of thermogenic hydrocarbon processes. The activity of the mud volcanoes is indicated by the thickness of hemi-pelagic sediments covering extruded mud breccia, the occurrence of seep-typical fauna, the degree of mixing between thermogenic and biogenic hydrocarbon processes, or the depth to the base of the sulphate reduction zone. Given its structural setting and the evidence of thermogenic and biogenic hydrocarbons, the area has promising hydrocarbon potential but remains untested. © 2005 Elsevier B.V. All rights reserved.
Authors & Co-Authors
van Rensbergen, Pieter
Belgium, Ghent
Universiteit Gent
Depreiter, Davy
Belgium, Ghent
Universiteit Gent
Pannemans, Bart
Belgium, Ghent
Universiteit Gent
Moerkerke, Geert
Belgium, Ghent
Universiteit Gent
Van Rooij, D.
Belgium, Ghent
Universiteit Gent
Marsset, Bruno
France, Plouzane
Ifremer Institut Francais de Recherche Pour L'exploitation de la Mer
Akhmanov, Grigory G.
Russian Federation, Moscow
Lomonosov Moscow State University
Blinova, Valentina
Russian Federation, Moscow
Lomonosov Moscow State University
Ivanov, Michael
Russian Federation, Moscow
Lomonosov Moscow State University
Rachidi, Merouane
Morocco, Rabat
Mohammed V University in Rabat
Magalhaes, Vitor
Portugal, Aveiro
Universidade de Aveiro
Pinheiro, Luis Menezes
Portugal, Aveiro
Universidade de Aveiro
Cunha, Marina R.
Portugal, Aveiro
Universidade de Aveiro
Henriet, Jean Pierre
Belgium, Ghent
Universiteit Gent
Statistics
Citations: 137
Authors: 14
Affiliations: 5
Identifiers
Doi:
10.1016/j.margeo.2005.04.007
ISSN:
00253227
Research Areas
Environmental
Study Design
Cross Sectional Study
Study Approach
Quantitative