Papers by Hassan Ouanaimi
EGU General Assembly Conference Abstracts, Apr 1, 2018
Journal of African Earth Sciences, Sep 1, 2019
South of the Pan-African suture zone of the Anti-Atlas, the Agadir Melloul inlier exhibits severa... more South of the Pan-African suture zone of the Anti-Atlas, the Agadir Melloul inlier exhibits several crests of nearly vertical conglomeratic quartzite beds inserted in Paleoproterozoic granites. These enigmatic rocky walls have been considered as Early Neoproterozoic platform sediments pinched within the 2.03 Ga-old granites during brittle faulting events at ca. 570 Ma. The data presented here contradict this interpretation. The quartzite crests correspond to parts of tight synclines pinched along brittle-ductile, strike-slip shear zones involving the granitic basement itself. This deformation occurred in low-grade greenschist facies conditions at T=260-280°C. The detrital zircon grains from the vertical quartzite beds are mostly grouped around 2 Ga, with the youngest grains at 1.8 Ga. Thus, the studied quartzites exhibit the same detrital zircon barcode as the other siliciclastic platform formations of the southwestern Anti-Atlas (Taghdout Group) whose age has been recently
Bulletin De La Societe Geologique De France, 1992
Bulletin De La Societe Geologique De France, 1992
The application of sequence stratigraphy concepts to the study of Upper Georgian-Acadian shelf of... more The application of sequence stratigraphy concepts to the study of Upper Georgian-Acadian shelf of south-eastern Morocco allows the determination of two depositional sequences and a good definition of their system-tracts. The sedimentary unconformities undoubtedly originate from global sea-level changes. For one of them (D2), a regional tectonic origin is not excluded
Journal of African Earth Sciences, 2019
South of the Pan-African suture zone of the Anti-Atlas, the Agadir Melloul inlier exhibits severa... more South of the Pan-African suture zone of the Anti-Atlas, the Agadir Melloul inlier exhibits several crests of nearly vertical conglomeratic quartzite beds inserted in Paleoproterozoic granites. These enigmatic rocky walls have been considered as Early Neoproterozoic platform sediments pinched within the 2.03 Ga-old granites during brittle faulting events at ca. 570 Ma. The data presented here contradict this interpretation. The quartzite crests correspond to parts of tight synclines pinched along brittle-ductile, strike-slip shear zones involving the granitic basement itself. This deformation occurred in low-grade greenschist facies conditions at T=260-280°C. The detrital zircon grains from the vertical quartzite beds are mostly grouped around 2 Ga, with the youngest grains at 1.8 Ga. Thus, the studied quartzites exhibit the same detrital zircon barcode as the other siliciclastic platform formations of the southwestern Anti-Atlas (Taghdout Group) whose age has been recently
Journal of African Earth Sciences, 2014
ABSTRACT Paleoproterozoic metamorphic and igneous rocks, Tonian (?)-lower Cryogenian passive marg... more ABSTRACT Paleoproterozoic metamorphic and igneous rocks, Tonian (?)-lower Cryogenian passive margin sedimentary rocks, Neoproterozoic dolerites, and Upper Ediacaran volcaniclastic, volcanic and pyroclastic rocks are exposed in the Agadir Melloul, Iguerda and the southern edge of the Sirwa inliers. A recent field mapping program of the Ediacaran Ouarzazate Group in these areas allow to distinguish three principal volcanic sequences. The first sequence (Adrar-n-Takoucht Formation) outcrops mainly south of the Sirwa inlier, and is composed of felsic pyroclastic deposits and local basaltic lavas with ages ranging between 572 and 570 Ma. The second sequence (Anammar and Tadoughast formations) occurs primarily in the Agadir Melloul-Jbel Iguiguil inlier. The Anammar Formation contains essentially volcano-detrital sediments, with fine airfall pyroclastic deposits. The Tadoughast Formation is composed of felsic pyroclastic deposits and rhyolitic domes with ages ranging between 567 and 564 Ma. The third sequence (Fajjoud Formation) contains felsic pyroclastic deposits, with an age of 556 Ma, associated with porphyritic basalts. The magmatism of the Ouarzazate Group was not continuous between 572 and 556 Ma, but related to distinct pyroclastic pulses.
EGU General Assembly Conference Abstracts, Apr 1, 2018
Journal of African Earth Sciences
Geoheritage, Geoparks and Geotourism, 2015
ABSTRACT The remote regions of Southern Morocco are rich in outstanding geological landscapes and... more ABSTRACT The remote regions of Southern Morocco are rich in outstanding geological landscapes and outcrops not well known to the general public. In this paper, we propose two east-trending geotrails (transverse to the regional trend of the structures) with a total of 19 geosites of particular interest for geotourists as well as for geologists. The southernmost, Dakhla-Awsard geotrail gives the opportunity to observe the oldest rocks (Archaean) of Morocco, belonging to the West African Craton (WAC), and their relatively thin Palaeozoic cover. This trail also presents a section across the Variscan nappes thrust over the craton, which is a unique geological setting in Morocco, but extending widely southward to Mauritania. Finally, the trail includes four geosites in the Cretaceous-Cenozoic deposits of the Coastal Basin, close to the Dakhla sea resort. The northern geotrail starts from El Ouatia (Tan-Tan Plage), another sea resort situated 700 km in the north of Dakhla. This trail illustrates the main geological features of the Tarfaya Atlantic margin basin and provides a cross-section of the Anti-Atlas Variscan folds up to the border of the WAC. Here the External Variscan belt differs from that of the Dakhla transect by the great thickness of the Palaeozoic series and the contrasting styles of tectonic structures (faults and folds versus thrust nappes). The equipment and the promotion of these geotrails will increase the attractiveness of the wild nature of the Saharan regions of Morocco.
Advances in Geophysics, Tectonics and Petroleum Geosciences
Journal of African Earth Sciences
Magmatisme, Métamorphisme et Minéralisations Associées 3MA-11ème coll, Apr 23, 2019
Journal of African Earth Sciences, 2022
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Papers by Hassan Ouanaimi