The plateau of Meknes and its borders shows a great geological diversity. The plateau is formed by a cover of marls, fawn sands and lacustrine limestones. The geological formations of the borders are composed of dolomitic limestones and marls of Jurassic age. The quarries of the plateau of Meknes and its borders are of diversified geological nature. In this region, the problem of increased demand for building materials causes excessive overexploitation, without taking account of quality and rational use measures. This problem requires a study of the state of the quality of these materials to guide the entrepreneurs towards the places where the quarries are of quality required by the standards of the field of the BTP, and on the other hand to control over the abuse user of these building materials and its influence on the environment. For these aims, a study of mineralogical and chemical analyzes by X-ray diffraction and by ICP-AES was carried on the samples taken from four quarries of materials used in this region. Thus, the physical and mechanical parameters of the materials are measured according to the most fundamental geotechnical protocols in the construction geomaterials. These analytical results have allowed to class spatially of the mineralogical, geochemical and geotechnical quality of this material in comparison with the standards. Keywords

No abstract

The South-Rifain ridges are located at 30 Km in the North of Meknes City, they constitute the extreme southern limit of the Rifaine chain. Globally, these ridges integrate into the history of African northwestern margin evolution. Mainly, the frame of this ridge is composed of the Jurassic sedimentation. The Fert Elbir ridge, subject of this study, is among the leading reliefs in the South-Rifain ridges. Generally, in this ridge, two geological sections have been studied, in the objective to determine and to understand the history of sedimentological, bio-stratigraphical and paleoenvironmental evolution of the Jurassic sedimentary series. Essentially, it includes the carbonates and marls deposits, composed mainly by several facies and micro-facies, grouped in eight facies associations. They contain a very important biological diversity especially at the level of the middleDomerian. Paleo-environmentally, this sedimentation series was deposited in the many diversified environments, having the areas of deposit essentially very close to the coast (proximal), or located in distal position with several hundred meters from the shore.Keywords: South-rifain Ridges, Carbonate, Palaeoenvironment, Jurassic, Domerian-Toarcian RésuméLes rides sud-rifaines sont situées à 30 Km au Nord de la ville de Meknès. Elles constituent la limite méridionale de la chaine rifaine. Elles s'intègrent dans l'histoire de l'évolution de la marge africaine nordoccidentale pendant le Jurassique. L'ossature de ces rides est composée par European Scientific Journal December 2017 edition Vol.13, No.36 ISSN: 1857 -7881 (Print) e -ISSN 1857 133 des formations sédimentaires jurassiques. La ride de Fert Elbir, objet de cette étude, est l'un des principaux reliefs des rides sud-rifaines. Deux coupes géologiques de cette ride ont été effectuées, pour appréhender l'évolution sédimentologique, bio-stratigraphique et paléoenvironnementale de la série sédimentaire du Domérien-Toarcien inférieur. Le cortège sédimentaire est composé essentiellement par des dépôts carbonatés et marneux qui sont regroupés en huit associations faciologiques. Elles renferment une diversité biologique très importante surtout au niveau du Domérien moyen. De point de vue paléoenvironnement, ces faciès sont déposés dans plusieurs types d'environnements, comportant essentiellement des milieux de dépôts proximaux très proches du littoral ou des milieux distaux.