Badji R. auteur aut IRD Charvis Philippe auteur aut IRD Bracene R. auteur aut IRD Galve A. auteur aut IRD Badsi M. auteur aut IRD Ribodetti Alessandra auteur aut IRD Benaissa Z. auteur aut IRD Klingelhoefer F. auteur aut IRD Medaouri M. auteur aut IRD Beslier M. O. auteur aut IRD text journalArticle eng text/pdf born digital access For the first time, a deep seismic data set acquired in the frame of the Algerian-French SPIRAL program provides new insights regarding the origin of the westernmost Algerian margin and basin. We performed a tomographic inversion of traveltimes along a 100-km-long wide-angle seismic profile shot over 40 ocean bottom seismometers offshore Mostaganem (Northwestern Algeria). The resulting velocity model and multichannel seismic reflection profiles show a thin (3-4 km thick) oceanic crust. The narrow ocean-continent transition (less than 10 km wide) is bounded by vertical faults and surmounted by a narrow almost continuous basin filled with Miocene to Quaternary sediments. This fault system, as well as the faults organized in a negative-flower structure on the continent side, marks a major strike-slip fault system. The extremely sharp variation of the Moho depth (up to 45 +/- 3 degrees) beneath the continental border underscores the absence of continental extension in this area. All these features support the hypothesis that this part of the margin from Oran to Tenes, trending N65-N70 degrees E, is a fossil subduction-transform edge propagator fault, vestige of the propagation of the edge of the Gibraltar subduction zone during the westward migration of the Alboran domain. specialized Seismic tomography Continental margins: transform Crustal structure Africa Europe EUROPE AFRIQUE ALGERIE 066 200 2 1027-1043 2015 0956-540X https://www.documentation.ird.fr/hor/fdi:010063962 10.1093/gji/ggu454 0956-540X [F B010063962] https://www.documentation.ird.fr/hor/fdi:010063962 https://www.documentation.ird.fr/intranet/publi/2015/04/010063962.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2015-05-04 2021-11-10 fdi:010063962 fre