Abstract
The Triassic basin of Mohammedia-Benslimane-ElGara-Berrechid contains a sedimentary series consisting of a sandy-conglomeratic formation (Formation A) at the base, surmounted by an argillaceous-saliferous formation (Formation B), the whole being capped by Late Triassic-Early Jurassic basalts. Formation (A) is formed by conglomeratic facies with alternations of sandstone in the middle and top of the formation. Formation (B) is subdivided into two members: (1) mudstone-siltstone member formed by alternations of mudstone and siltstone facies; and an argillaceous-saliferous member (2) composed by mudstone and evaporite facies. Sedimentary analysis carried out on more than ten outcrops and on four cores sample that have identified fifteen types of facies and seven architectural element and facies associations. It leads to the reconstruction of depositional environments during the Upper Triassic in the basin. Also, this work allowed a comparison of the sedimentary series of this basin with those of the other basins of the Moroccan Atlantic margin on one side and the North-east American margin on the other side.
Highlights
The Mohammedia-Benslimane-ElGara-Berrechid (MBEB) basin is considered among the most important Triassic basins in Morocco and even in the world. This importance is reflected in its role in understanding the geodynamic and paleogeographic history of the Central Atlantic domain during the Triassic time
Most of these Triassic basins belonging to the Central Atlantic domain show a similar sedimentological evolution
The vertical and horizontal arrangement of these facies gives birth to the architectural elements characterized according to several criteria determined by Allen (1983) and Miall (1985, 2006), which are: the nature of the upper and lower bounding surfaces, the external geometry, the scale, and the internal structures
Summary
The Mohammedia-Benslimane-ElGara-Berrechid (MBEB) basin is considered among the most important Triassic basins in Morocco and even in the world. This importance is reflected in its role in understanding the geodynamic and paleogeographic history of the Central Atlantic domain during the Triassic time. Most of these Triassic basins belonging to the Central Atlantic domain show a similar sedimentological evolution. They are dominated by continental deposits (Withjack et al, 1998; Leleu and Hartley, 2010; Withjack et al, 2012; Leleu et al, 2016). The sedimentary filling of these basins is strongly diachronous, and the timing and duration of the deposition phase vary from one basin to another (Leleu et al, 2016).
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