Les chevauchements frontaux du Haut Atlas central marocain : styles structuraux et taux de raccourcissement différentiel entre les versants nord et sud

A structural transect through the High and Middle Atlas of Morocco

“…The footwall ramp geometry of the contact precludes a large displacement for this thrust. Thrusting in this area was shown to be thick-skinned by Benammi et al (2001), on the basis of seismic profiles. In the middle part of the section a large anticlinorium defined by Liassic limestones represents the western continuation of the Mougueur basement massif (MC in Fig.…”

The Atlas System

“…4.36) as well as by seismic-reflection (e.g. Toundoute area; Benammi et al, 2001). The stratigraphy of these imbricate units yields critical dates for the mountain building chronology.…”

“…References: The main recent references comprise the studies by Rolley (1978), Petit et al (1985), Dutour & Ferrandini (1985), Morel et al (1993), Chellaï & Perriaux (1996), Salomon et al (1996), Beauchamp et al (1999), Benammi et al (2001), Hafid et al (2006), Najine et al (2006), Missenard et al (2007). The text below is also based on an unpublished synthesis by ONHYM, made under the supervision of Pr.…”

“…For the Siroua shelf (between the Souss and Ouarzazate Basins), a recent reference is Missenard et al (2007). Due to spectacular tectonic structures and the presence of a well-developed Cretaceous-Eocene series, the Ouarzazate Basin is somewhat over-studied (Laville et al, 1977;Fraissinet et al, 1988;Görler et al (1988), Zylka (1988), Jossen & Filali-Moutei, 1992;Gheerbrant et al, 1993;Herbig & Trappe (1994); Errarhaoui, 1998;El Harfi et al, 2001;Benammi et al, 2001;Tabuce et al, 2005;Teson & Teixell, 2006). .…”

The three main steps of the Marrakech High Atlas building in Morocco: Structural evidences from the southern foreland, Imini area

“…During the Cenozoic inversion, the Ouarzazate Basin underwent deformation on its northern edge with imbricate fans on its western part (Errarhaoui, 1998;Beauchamp et al, 1999;Benammi et al, 2001;Teson, 2005;Teson and Teixell, 2008), whereas eastern regions of the southern foreland show tip-line folds (Saint-Bézar et al, 1998). Various décollement levels are activated such as "Senonian" gypsum and Late Triassic-Early Liassic evaporites (Missenard et al, 2007;Frizon de Lamotte et al, 2008).…”