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The Réguibat dorsal

the Réguibat dorsal constitutes the Precambrian reinforcement of western sahara. It forms a crystalline axis SW-NE which extends on approximately 1500 km from Mauritania as far as Algeria. It is inserted under the paleozoic grounds of the basins of Tindouf (in North) and Taoudeni (in the South). It is composed of grounds of Archean age in the West and is prolonged in the East by the paleoproterozoïc formations of the solid masses of Yetti and Eglab.

The solid mass of Yetti, broad of approximately 150 km is limited to the East and the West by crushed zones. It is mainly represented by the formations folded and metamorphized of the inferior Réguibat complex and recut by let us plutons granitic Superior Réguibat complex. Two areas separated by an accident N.NW-S.SE are distinguished. The zone Is, between the solid mass of Eglab and the zone of median fracture, includes quarzites ends, blacks, injected quartz lenses and a complex rhyodacitic. The Western zone is primarily schistous. It includes phyllites injected of quartz lenses, mica schists, gneisses and compound gneisses. The granites (e.g. granite of Bou Emaina) are differentiated than in the East.

Three great times of structuring of the Réguibat dorsal are classically distinguished:

• the old base represented by the series of Chegga and its Mauritanians equivalents, the series of Hassi el Fogra of the South Iguidi and Ghallaman;

• the second time brought back to the eburnean orogenèse includes two distinct cycles. The first cycle corresponds to the Yetti series and its equivalent Mauritanian, the series of Aguelt Nebkha and with granitoid of Yetti which cross them. The second cycle corresponds to the series of Akilet Deilel and the Souss wadi and their probable Mauritanians equivalents that are the series of El Naam, Aïoun Abd el Malek and Imourène. The Aftout plutonism is associated this cycle. After one period of erosion, stopped by the acid emissions of Eglab volcanicity, the series of Guelb el Hadid is set up locally;

• the third time is represented by the unmatched deposits of the marine series of Hank which close Precambrian Réguibat dorsal before the drifts then the paleozoic sediments of the basins of Taoudeni and Tindouf.

 
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