Abstract
The present work deals with the sedimentological, lithostratigraphic and paleoenvironmental study of the red (Senonian) series of the two sections Asfalou and Anmitar located in the district of Imini, Asfalou. These areas are semi-arid zone in the south of the High central Atlas-Morocco. Different analysis was performed such as a sedimentological, lithostratigraphic analysis of the facies to recognise sedimentary structures and textures encountered. Also, the collection of samples for exoscopic analysis of quartz grains was conducted, and the analysis of clay procession was done. In general, all the sedimentation was spent in a continental environment (fluvial or flooded) with some rare marine upwellings that are marked by the installation of dolomite bars.
Highlights
1 The Moroccan High Atlas is an orogenic system considered to be the result of the recent Cenozoic evolutionary tectonic inversion of the Triassic and Jurassic rift systems (Frizon et al.,2008)
It presents the result of a long and complex tectonosedimentary evolution linked to the Mesozoic continental rifting evolution of Pangaea, the subsequent opening of the Atlantic and northwestern Tethys Oceans (pre-orogenic period (Giese et al.,1992; Laville,1992; Mattauer et al.,1977), and subsequently, the Cenozoic convergence between Africa and the European plates that led to a complete tectonic inversion of the striated basins orogenic period (Frizon et al, 2008; Mattauer et al.,1977)
5.Conclusion The Senonian is a monotonous set of clayey pink and red sands, with secondary gypsum beds
Summary
The North Atlas fault delimits the WSW-ENE trend chain to the north and the South Atlas fault to the south, which is called the master faults of the striated basins active during the preorogenic period and hosting inversions during the orogenic period (Frizon et al, 2009). This intracontinental inversion chain is subdivided into three zones: The Western High Atlas, the Eastern High Atlas and the Central High Atlas (Figure.1), which is the field of study of this work.
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