Resumen de Subsidence and uplift during the Plio-Quaternary in the Oued Laou and Tirinesse sectors (Internal Rif, Morocco)
Rachid Hlila, Carlos Sanz de Galdeano Equiza, Khalil El Kadiri, Antonio Guerra Merchán, Francisco Serrano Lozano
The Oued Laou area and the Tirinesse basin are filled with early Pliocene (Zanclean) marine sediments very slightly deformed but currently outcropping at different altitudes. In Tirinesse area Zanclean sediments reach high altitudes (+600 m), whereas coeval sediments appear near the coastal level in Oued Laou area and even more than 100 m under the sea level in a borehole near the coast. The difference of altitudes is explained by two successive processes. First there was an important regional subsidence permitting sedimentation. Moreover, in the Tirinesse basin, due to the combined movement of the two SW-NE conjugated normal faults, an additional tectonic subsidence took place. Later, a regional and not homogenous uplift, progressively more important to the west, occurred in the Rifian Internal Zone, then surpassing the effects of the subsidence. Differential vertical displacements also existed in a N-S direction.
