Sedimentological, Lithostratigraphic, Clayey and Exoscopic Study of the Senonian Series of Arg N’Sidi Ali Ou Bourk, High Central Atlas of Morocco

The sedimentological study of the red formations (Senonian series) represents a challenge and an exciting subject that needs to be explored. This paper will present the sedimentological, stratigraphic, and paleogeographic aspects of the Upper Cretaceous of the ARG N'SIDIALI OR BOURK, Central High Atlas Morocco. In this region, a marker section was realized bed by bed and sampled in a very straightforward way in order to study stratigraphy, to describe, to interpret and to characterize the sedimentary environment of the senonian succession in the ARG N'SIDIALI OU BOURK region, more particularly the analysis of the clays by X-ray diffractometer (XRD) has allowed understanding the depositional environments of the Upper Cretaceous formations. Therefore, the Senonian of ARG N'SIDIALI OU BOURK corresponds to continental lagoon deposits. It is characterised by sedimentation in the continental environment (fluvial or flooded), with some rare marine ascents marked by the installation of whitish sandstone bars.

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Sedimentological and Lithostratigraphic Study of the Senonian Series in Timstiguite Region, Central High Atals, Morocco

Journal of Environmental and Agricultural Studies ◽

10.32996/jeas.2021.2.1.1 ◽

2021 ◽

Vol 2 (1) ◽

pp. 01-11

Author(s):

Abdelouhed Farah ◽

Ahmed Algouti ◽

Abdellah Algouti

Keyword(s):

Depositional Environment ◽

Upper Cretaceous ◽

Surface Characteristic ◽

Point Of View ◽

Central Basin ◽

Carbonate Facies ◽

High Atlas ◽

Central High ◽

Quartz Grains ◽

Central High Atlas

In this paper, we present the sedimentological, stratigraphic and paleogeographic aspect of the Upper Cretaceous red formations (Senonian series) of Timstiguite region (Central High Atlas of Morocco). The formations were measured bed by bed and sampled in a very detailed way. An exoscopic analysis of the quartz grains was carried out by a systematic prospecting of the grains relief and theirs surface characteristic, this led us to characterize their origin and consequently to determine the different paleoenvironnements. The clay sediments of these formations seem to be a favorable prospect in point of view: evolution of the clay and non-clay sediments in this central basin of the High Atlas will depend mainly on the conjugation of tectonic, eustatic, climatic and other influences. The senonian thickness is more important than other sub basins (Albban and Imider) where it shows a very reduced thickness. The Senonian of Timstiguite corresponds to a succession of detrital and evaporitic carbonate facies, which confirms a coastal depositional environment with passages of some periods of marine emersions.

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Sedimentological and lithostratigraphic study of the Foum El Kous Senonian, Central Hight Atlas of Morocco

E3S Web of Conferences ◽

10.1051/e3sconf/202124004001 ◽

2021 ◽

Vol 240 ◽

pp. 04001

Author(s):

Abdelouhed Farah ◽

Ahmed Algouti ◽

Abdellah Algouti ◽

Fatiha Hadach ◽

zahra Mourabit

Keyword(s):

Upper Cretaceous ◽

Depositional Environments ◽

Central Basin ◽

The West ◽

High Atlas ◽

The North ◽

Continental Deposits ◽

Central High ◽

Quartz Grains

The study area belongs to the southern edge of the central High Atlas. It is limited to the North by the Sub-atlasic accident and to the South by the extension of the Eastern Anti Atlas formations. To determine the depositional environments of the Senonian series, a sedimentological analysis of the facies was carried out based on field observations by the recognition of sedimentary structures and textures. An exoscopic analysis of the quartz grains was also carried out by a systematic prospecting of the grain relief and of all the characters that will appear on the surface of the grain after the formation of the mother rock at the origin place, during transport, immobilization phases and deposition. It seems very interesting to prospect for the clayey side in these Upper Cretaceous reddish formations because the evolution of the clayey and non-clayey assemblages in this central basin of the High Atlas will depend mainly on the combination of tectonic, eustatic, climatic and other influences. The Senonian of Foum El Kous which has a less important thickness corresponds to continental deposits that act the role of a natural barrier that separates on both sides the two sub-basins: Sidi Ali Oubork in the East and Ait youl in the West.

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