SEDIMENT DYNAMICS DURING THE NEOGENE PERI OD ALONG THE NORTHERN BORDER OF THE HIGH ATLAS (HAOUZ, MARRAKECH, MOROCCO)

During the Neogene time, a foreland basin is developped in the south o f Marrakech along the Haut Atlas range. The compressive tectonic activ ity along the margin is the factor governing the sequential arrangemen t of deposits. The sedimentary deposition is related to the Atlasic te ctonics, which remobilize the Hercynian fault pattern. Two compressive phases are characterized. A post-Eocene phase initializes several com partments and various small basins. The Mio-Pliocene phase increases t he differential subsidence of these basins. Alluvial systems developpe d into basins, in which deposit sequences suggest a tectonically diffe rential synsedimentary control.