Westward extension by continental collabpse of the alboran Sea platelet in the early Neogene initiated large slump-block movements along the Iberic and Moroccan continental margins. Extensive allochthonous alt may underlye and serve as a lubricat for gravity-driven translation whose overall movement may exceed 400 km. Mobile, Late Cretacoepous-Paleogene salt, deposited in a plaeo-basin with a western limit of 10 deg W to 12 deg W, appears to have become diapiric. The migrating blocks and associated down-dip debis-flows may be the trapping mechanism for hydrocarbons. Migrating debris covers an area as great as 90,0-00 km~2 with potential reserves riveling the Gulf of Mexieo sub-salt play.
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