Ouanaimi Hassan

• Professeur Géologue
• Professor (Full) at Ecole Normarle Supérieure. Cadi Ayyad University. Marrakech. Morocco

From southern Senegal to northern Morocco, NW-Africa exhibits several poly-orogenic segments that registered the successive opening and closure of the Iapetus and Rheic (Proto-Atlantic) palaeooceans prior the breakoff of Pangea and the formation of the current Central Atlantic Ocean. This evolution was the founding example chosen by T. Wilson (1966...

The concept of cyclic opening and closure of ocean basins over millions of years along the same crustal scar was introduced by J.T. Wilson (1966) based on the example of the Atlantic Ocean and its continental borders. At that time, the only Variscan orogen cited south of Europe along the Atlantic coasts of Africa was the Mauritanides of Mauritania...

The concept of cyclic opening and closure of ocean basins over millions of years along the same crustal scar was introduced by J.T. Wilson (1966) based on the example of the Atlantic Ocean and its continental borders. At that time, the only Variscan orogen cited south of Europe along the Atlantic coasts of Africa was the Mauritanides of Mauritania...

This study presents geochronological and geochemical data of intermediate-felsic plutonic rocks from the Paleozoic Western High Atlas (Moroccan Meseta). Samples were taken from Medinet diorite emplaced in Cambrian Taroudant Group volcanic and sedimentary rocks and Tiniskt microgranite intrusive in Ediacaran Ouarzazate Group volcano-sedimentary rock...

The Western Moroccan Meseta exposes in the Zaian region a pre-Visean, Eo-Variscan belt of inclined to recumbent folds detached from their Precambrian basement and embedded in the Variscan Orogen. Using the Raman Spectroscopy of Carbonaceous Material (RSCM) method, we obtained the first quantitative thermometric characterization of the Cambro-Ordovi...

The northern margin of the West African Craton is characterized by Paleoproterozoic siliciclastic sediments intruded by ca. 2.1-2.0 Ga Eburnean granitoids. New geochronological data highlight the occurrence of a Rhyacian (2.10 Ga) tonalitic to trondhjemitic magmatic suite, following a coeval Orosirian (2.040-2.035 Ga) magmatic suite composed of cal...

L’Anti-Atlas est une chaîne de montagnes cénozoïque à reliefs modérés (1 000 à 3 300 m), située au centre-sud du Maroc, entre le Haut-Atlas et le bassin de Tindouf. Elle se prolonge à l’ouest dans le Sahara marocain par le Jbel Zini et, à l’est, par la chaîne d’Ougarta en Algérie. Les travaux pionniers de la première moitié du siècle dernier sont l...

The High Atlas belt of Morocco is a doubly vergent intracontinental belt formed during Cenozoic convergence between the African and Eurasian plates. This belt is characterized by the simultaneous occurrence of high topographic elevation, minor crustal thickening and weak tectonic shortening, which are commonly explained by models of inversion tecto...

The thermal structure inherited from the high-temperature rifting phase may control the deformation regime during the first phase of compression. The Zaian Mts of Western Meseta provide a nice example studied here with the help of the Raman method.

The thermal structure inherited from the high-temperature rifting phase may control the deformation regime during the first phase of compression. The Zaian Mountains and adjoining Jebel Hadid constitute a demonstrative case study in the southern branch of the Variscan belt in Central Meseta, Morocco. There the thick, Cambrian-Ordovician quartzite s...

The territory covered by Ayt Khojmane Sheet at 1/50 000 belongs to of the Moroccan eastern High Atlas domain, consisting of a Tertiary intra-continental Atlas-Alpine chain uplifted southern of the Africa-Europe collision chains. Almost the entire map is covered by the Jurassic sedimentary series. The Mesozoic cover begins with the detrital synrift...

Example of post-Ediacarian complex volcanism emplaced during the Cambrian rifting in the Western High-Atlas, Morocco: Geochemical study and geotectonic significance Exemple d'un volcanisme complexe post-Ediacarien mis en place durant le rifting cambrien dans le Haut-Atlas occidental, Maroc : Etude géochimique et signification géotectonique Abstract...

Example of post-Ediacarian complex volcanism emplaced during the Cambrian rifting in the Western High-Atlas, Morocco: Geochemical study and geotectonic significance Exemple d'un volcanisme complexe post-Ediacarien mis en place durant le rifting cambrien dans le Haut-Atlas occidental, Maroc : Etude géochimique et signification géotectonique Abstract...

Because of its location in the boundary zone between the Anti-Atlas and the Atlas–Meseta crustal domains of Morocco, the Mougueur Paleozoic Massif is a key area to decipher the evolution of the Gondwana NW margin during the Paleozoic. In this work, we report for the first time the occurrence of Hirnantian sandstones, Silurian (Gorstian) graptolitic...

Between the High Atlas and the Saharan platform, the Anti-Atlas of Morocco offers large exposures of Precambrian rocks beneath the moderately folded Paleozoic series. These inliers allow reconstructing a segment of the Pan-African Belt and of its foreland at the northern outskirts of the West African Craton (WAC). From ∼ 885 Ma to ∼ 540 Ma, three p...

Geological map

Most of the structural studies of the intracontinental High Atlas belt of Morocco have dealt with the central part of the belt, whose basement does not crop out. Here we study the Alpine deformation of the North Subatlas Zone, which is the part of the Western High Atlas (WHA) Paleozoic Massif that involves both Paleozoic basement units and remnants...

Résumé : Le territoire couvert par la feuille de Galb-at-Tour au 1/50 000 appartient au domaine géographique de l’Haut Atlas oriental marocain, constitué par une chaîne intracontinentale atlaso-alpine formée au Tertiaire à l’arrière des chaînes de collision entre Afrique et Europe. Le territoire de la feuille de Galb at Tour est occupé, dans partie...

Résumé : Le territoire couvert par la feuille d’Ayt Wazag au 1/50 000 appartient au domaine géographique de l’Haut Atlas oriental marocain, constitué par une chaîne intracontinentale atlaso-alpine formée au Tertiaire à l’arrière des chaînes de collision entre Afrique et Europe. Le territoire de la feuille d’Ayt Wazag est entièrement occupé par des...

Notes et Mémoires du Service Géologique du Maroc, n° 594. ISSN 0369-1748

Notes et Mémoires du Service Géologique du Maroc, n° 595. ISSN 0369-1748

The Saghro Group (SG) is a folded, low-grade volcano-sedimentary series up to 8 km thick that crops out within and to the north of the Pan-African suture zone in the central and eastern Anti-Atlas. Here we describe the SG of the Ougnat inliers that are exposed in the easternmost Anti-Atlas beneath the unconformable, Late Ediacaran Ouarzazate Group...

The transition from the Cambrian to Ordovician in Morocco is known to be characterized by a frequent Furongian hiatus, restricted extension of the Tremadocian marine deposits, and frequent unconformities at the base of the transgressive upper Floian deposits. In the present work, we first highlight the occurrence of Fe- and mica-rich, red silty/san...

The remote regions of Southern Morocco are rich in outstanding geological landscapes and outcrops not well known by the general public. In this work, we propose a200 km long, southeast-trending geotrail starting from the Dakhla sea-resort and ending at Awsard inside the Sahara Desert, with a total of ten geosites of particular interest for geotouri...

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 southernm...

The post-Pan-African evolution of the northern border of the West African Craton is largely controlled by the remobilisation of Late Neoproterozoic basement faults. The Upper Ediacaran volcanic and volcano-sedimentary sequences of the Ouarzazate Group show dramatic and rapid thickness changes, consistent with active extensional faulting associated...

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 G...

The territory covered by the Assaragh topographic sheet to 1:50 000 belongs to the geographical field of the Moroccan central Anti-Atlas, formed by a flattened mountain range which represents the north-western edge of Western African Craton. More precisely, the map fits into a rectangle in which the sedimentary cover of late Neoproterozoic to early...

The territory covered by Ighry 1:50 000 topographic sheet to belongs to the geographical field of Moroccan central Anti-Atlas, formed by a flattened mountain range which represents the north-western edge of Western African Craton. More precisely, the map fits into a rectangle in which the sedimentary cover of late Neoproterozoic to lower Paleozoic...

The territory covered by the Tabadrist 1:50 000 sheet belongs to the geographical field of Moroccan central Anti-Atlas, formed by a flattened mountain range which represents the north-western edge of the Western African Craton. More precisely, the map fits into a rectangle in which the sedimentary cover of late Neoproterozoic to early Paleozoic for...

The territory covered by the Agadir-Melloultopographic sheet to 1:50 000 belongs to the geographical field of the Moroccan central Anti-Atlas, formed by a flattened mountain range which represents the north-western edge of Western African Craton. More precisely, the map fits into a rectangle in which the sedimentary cover of late Neoproterozoic to...

This book is devoted to different aspects of tectonic researches, especially to modern geodynamic processes. Syntheses of recent and earlier works, combined with new results and interpretations, are presented here for diverse tectonic settings. Most of chapters include up-to-date materials of detailed geological-geophysical investigations, which ca...

This work is based on the compilation and re-evaluation of the most significant data, either personal or from the literature, concerning the Moroccan Variscides. The latter constitute the only, moderately disturbed or even undisturbed part of the South-Western Branch of the Variscan Belt, facing directly NW Gondwana. They include two orogenic segme...

We present comparative field studies in folded areas (Southern France, Moroccan Western Atlas and Abruzzo, Italy) giving new insights into fracture distribution within folded rocks of the shallow brittle crust. We show that the curvature in folds formed in brittle mechanical units is usually accommodated by multiple “dip-domain boundaries” (appeari...

e a 10, rue des Jeûneurs, 75002 Paris, France b De´partement de ge´ologie, ENS, universiteadi Ayyad, BP S2400 Marrakech, Morocco c De´partement de ge´ologie, facultees sciences, universiteohamed V, BP 1014 Rabat Agdal, Morocco d De´partement de ge´ologie, facultees sciences, universiteadi Ayyad, BP S20 Marrakech, Morocco e De´partement de ge´ologie...

In this study, based on a sedimentary analysis, an interpretation in terms of sequence stratigraphy is proposed for the 'Rich' group of the Early Devonian Drâa Basin (of Pragian to late Eifelian age). This group is composed of four depositional sequences (third order) containing a transgressive systems tract and a highstand systems tract, both depo...

In fractured reservoirs formed in shallow crust conditions, fracture clustering is expected to have a very strong dynamic impact. The Moroccan western High-Atlas exhibits numerous folded structures related to the atlasic orogenesis were fracturing can be easily observed due to favourable mechano-stratigraphical conditions. In the cretaceous carbona...