Mapping of soil degradation in semi-arid environments in the Ouarzazate basin in the south of the Central High Atlas, Morocco, using Sentinel 2 A data

2021 ◽  
pp. 100548
Author(s):  
Abdelouhed Farah ◽  
Ahmed. Algouti ◽  
Abdellah. Algouti ◽  
Mohammed. Ifkirne ◽  
Aboubakr Ezziyani ◽  
...  
Keyword(s):  
Soil Degradation ◽  
Arid Environments ◽  
The South ◽  
High Atlas ◽  
Central High ◽  
Semi Arid ◽  
Central High Atlas ◽  
Sentinel 2

scholarly journals Sedimentological, Lithostratigraphic, Clayey and Exoscopic Study of the Senonian Series of District Imini, Asfalou and Anmitar, Central High Atlas, Morocco

2021 ◽  
Vol 2 (1) ◽  
pp. 54-61
Author(s):  
Abdelouhed Farah ◽  
Ahmed Algouti ◽  
Abdellah Algouti ◽  
Abdelhalim Tabit ◽  
Hadach Fatiha ◽  
...  
Keyword(s):  
Arid Zone ◽  
The South ◽  
High Atlas ◽  
Sedimentary Structures ◽  
Central High ◽  
Quartz Grains ◽  
Semi Arid ◽  
Central High Atlas

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.

Impact of Climate Change on Soil Sensitivity Erosion in a Semi-Arid Context: Insights From Lakhdar Watershed, Central High-Atlas Morocco

2021 ◽  
Author(s):  
Hasna Eloudi ◽  
Hanane Reddad ◽  
Mohammed Hssaisoune ◽  
Joan Estrany ◽  
Samira Krimissa ◽  
...  
Keyword(s):  
Climate Change ◽  
High Atlas ◽  
Impact Of Climate Change ◽  
Soil Sensitivity ◽  
Central High ◽  
Semi Arid ◽  
Central High Atlas

Aznag (Ouarzazate basin, Morocco), a new African middle Eocene (Lutetian) vertebrate-bearing locality with selachians and mammals

2005 ◽  
Vol 176 (4) ◽  
pp. 381-400 ◽  
Author(s):  
Rodolphe Tabuce ◽  
Sylvain Adnet ◽  
Henri Cappetta ◽  
Abdelmajid Noubhani ◽  
Frédéric Quillevere
Keyword(s):  
Middle Eocene ◽  
Coastal Vegetation ◽  
Northwestern Part ◽  
Early Eocene ◽  
The South ◽  
Enamel Microstructure ◽  
High Atlas ◽  
Central High ◽  
Central High Atlas ◽  
Zonal Boundary

Abstract Early Paleogene mammals are rare in Africa. They are mainly found in the northwestern part of the continent. Nearshore marine deposits from the Ouarzazate basin, in the southern rim of the Central High Atlas (Morocco), have yielded diverse Thanetian and Ypresian selachian and mammalian faunas [Cappetta et al., 1978, 1987; Gheerbrant et al., 1993]. These faunas from the Paleocene/Eocene transition document the oldest known placental mammals of Africa [Gheerbrant, 1992, 1994, 1995; Gheerbrant et al., 1998; Sigé et al., 1990; Sudre et al., 1993]. New field work in the central part of the basin, near El-Kelaâ M’Gouna, has led to the discovery of a new locality with continental and marine remains, including some non-determinable ostracods and charophytes plus planktonic and benthic foraminifera. The tests of the planktonic foraminifera were globally poorly preserved and highly re-crystallized. However, we found Globigerapsis index (dominant in the sample), Globigerapsis aff. kugleri, Subbotina frontosa, Subbotina inaequispira, Acarinina bullbrooki, Acarinina aff. pentacamerata, Morozovella aragonensis, Morozovella caucasica, Morozovella crater and Pseudohastigerina sp. Following Berggren et al. [1995], the lowest occurrence of the genus Globigerapsis denotes the P10/P11 zonal boundary and the highest occurrence of M. aragonensis denotes the P11/P12 zonal boundary. Both these taxa were represented by several relatively well-preserved specimens. Then, we consider that the sample is correlative to the planktonic foraminiferal Zone P11, for which a biochronal equivalent has been dated between 45.8 and 43.6 Ma. Consequently, the middle Lutetian Aznag locality represents the only known Eocene mammalian site to be adequately dated in Africa. The selachian fauna is relatively rich with nearly 30 species, many of them being probably new. The genera Squatiscyllium, Protoginglymostoma, Ouledia and Garabatis are confidently identified; these taxa were unknown in the Lutetian. We mention the first occurrence in the Eocene of Morocco of « septentrional » taxa Protoginglymostoma, Hemiscyllium and Rhinobatos bruxelliensis and we confirm the presence of genera Eomobula and Rhynchobatus. These data suggest significant North to South faunal exchanges, that contrast with the South to North tendency observed during the early Eocene [Noubhani and Cappetta, 1997]. Nevertheless, the selachian fauna from Aznag is clearly tropical with the occurrence of endemic taxa only known from Morocco (Garabatis, Orectolobiformes nov. gen.) and from the equatorial Tethys-Central Atlantic (Chiloscyllium aff. meraense, Ginglymostoma aff. angolense, Squatiscyllium, « Dasyatis » aff. sudrei, Ouledia, Arechia, Odontorhytis). Only 15 mammalian teeth have been recovered, most of them are very fragmentary and of small size; they document at least 7 species. A probable soricomorph “insectivore” documented by a complete lower molar is very atypical by its tiny size and the entoconid and hypoconulid poorly differentiated from the postcristid. Another “insectivore” is documented by a trigonid of p4, it is reminiscent to the zalambdodont groups. An incisor of rodent shows an enamel microstructure with uniserial Hunter-Schreger bands ; this structure is observed in several Eocene rodents from Eurasia and could be related to the pauciserial to uniserial transition observed in Zegdoumys sebtlai from Chambi (early Eocene, Tunisia) [Martin, 1999]. An upper molar of chiropteran cannot be assigned to one of the known microchiropteran superfamilies; the species from Aznag is characterized by derived traits (e.g. crestiform protocone, hypocone present) and primitive ones such as the presence of a paraconule which evokes the “eochiropteran” grade and the primitive vespertilionoids (paleochiropterygids). A small primate is documented by two fragmentary lower molars and characterized by a well-marked bunodonty and a large paraconid ; this form differs from contemporaneous anthropoids but is very similar to Altiatlasius from the Thanetian of the Adrar Mgorn 1. Two “condylarths” evoke European taxa; a M3 is tentatively assigned to the genus Paschatherium and a DP3or4 is reminiscent to that of Microhyus. This specimen shows also affinities with the ?DP4 of Chambius, a primitive macroscelidid from Chambi. The presence of these mammals strengthen the hypothesis of faunal exchanges between Africa and Europe during the early Eocene. During the middle Eocene, in the south of the Central High Atlas, palynologic data suggested a fairly dry, scarcely vegetated hinterland, and a tropical coastal vegetation (mangrove swamp and salt-marsh) [Fechner, 1988]. The mammals of Aznag, which are characteristic of a closed environment (chiropterans, primate, small ungulates), were certainly confined to a thin belt of coastal vegetation (forest gallery). The fossiliferous level is characterized by a cyclicity of the deposits which could suggest a seasonal variation. Among the selacians, the abundance of the batoids, the absence of both macrofauna and deep-water selacians, and the fragmentary elements indicate hydrodynamical transport in a shallow channel or delta.

Stratigraphic and geodynamic characterization of Jurassic–Cretaceous “red beds” on the Msemrir–Errachidia E–W transect (central High Atlas, Morocco)

2021 ◽  
pp. 104330
Author(s):  
Mohamed El Ouali ◽  
Lahcen Kabiri ◽  
Badre Essafraoui ◽  
Ali Charroud ◽  
François-Nicolas Krencker ◽  
...  
Keyword(s):  
Red Beds ◽  
High Atlas ◽  
Central High ◽  
Central High Atlas

scholarly journals Diapiric growth within an Early Jurassic rift basin: The Tazoult salt wall (central High Atlas, Morocco)

Tectonics ◽  
2017 ◽  
Vol 36 (1) ◽  
pp. 2-32 ◽  
Author(s):  
J. D. Martín-Martín ◽  
J. Vergés ◽  
E. Saura ◽  
M. Moragas ◽  
G. Messager ◽  
...  
Keyword(s):  
Early Jurassic ◽  
Rift Basin ◽  
High Atlas ◽  
Central High ◽  
Central High Atlas
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