Abstract
Hercynian deformations in the western anti-Atlas area are controlled by the reactivation of faults in the Precambrain basement. The Bas-Draˆa anticline zone forms the southernmost Precambian basement massif covered by Infracambrian and Palaeozoic sedimentary formations. Relative motions of basement blocks induce in the cover an heterogeneous ductile deformation associated with a SE vergence. Structural data and finite strain measurements suggest the basement-cover relationships and late Cabboniferous age of the regional tectonics. The uplift of the Bas-Draˆa basement associated with the southeast thrusting induced a punching motion in the cover. A dextral shear component locally involved the rotation of structures or en echelon folding. The deformation is very intense near the basement boundaries, but decreases away from the boundary, as well as upwards within the sedimentary cover. To the southeast the deformation is very weak in the Carboniferous on the Saharan domain. The Bas-Draˆa area represents the last mobile block of Hercynian Belt foreland near the stable West African Craton. Vertical m movements are dominant versus wrench shifting.
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