Boukhalfa Zakaria

Center for Research in Astronomy and Astrophysics Geophysics | CRAAG

Water is essential for life, particularly in arid and desert regions where its presence is crucial. In Algeria, specifically in the southern part of the country, which constitutes a desert zone with minimal rainfall, emphasis has been placed on groundwater exploration. The Adrar region, and more specifically the Sebaa Basin, serves as the focal poi...

The West African Craton constitutes a significant geological domain within the African Precambrian basement, characterized by two cratonic sedimentary basins delineating three distinct Archaean and Paleoproterozoic metamorphic and magmatic shields. Among these shields, the Reguibat Shield features a basement primarily composed of Palaeoproterozoic...

Continental intraplate volcanic systems, with their locations far from plate tectonic boundaries, are not well understood: the crustal and lithospheric mantle structure of these systems remain enigmatic and there is no consensus on the mechanisms that cause melt generation and ascent. The Cenozoic saw the development of numerous volcanic provinces...

Environment protection is a core priority of many governments in this century. Most environmental problems have diverse causes: emission of greenhouse gases from fossil fuels, resource depletion, or intense mining activities such as the Huayuan manganese mine. The positioning of mining factories and water treatment stations impacts the surrounding...

Continental intraplate volcanic systems, with their location far from plate tectonic boundaries, are not well understood: the crustal and lithospheric mantle structure of these systems remain enigmatic and there is no consensus on the mechanisms that cause melt generation and ascent. The Cenozoic saw the development of numerous volcanic provinces o...

Continental intraplate volcanic systems, with their locations far from plate tectonic boundaries, are not well understood: the crustal and lithospheric mantle structure of these systems remain enigmatic and there is no consensus on the mechanisms that cause melt generation and ascent. The Cenozoic saw the development of numerous volcanic provinces...

The 4°50′Shear zone (SZ), one of the major structures of western Gondwana, formed in Hoggar during the Pan-African orogeny is still poorly studied; especially ages and deformation characteristics are lacking. We performed microstructural analysis and EBSD measurements on nine selected mylonites from the 4°50′SZ, and zircon U-Pb dating on two granit...

Volcanism occurs in several distinct geological settings. Most of these are associated with tectonic plate boundaries. In contrast, a relatively small number of volcanoes occur within plates far from their margins. The crustal and lithospheric mantle structure of such continental intraplate volcanic systems are enigmatic and the origins of volcanic...

Controlled source audio-magnetotelluric (CSAMT) is an indirect and effective geophysical prospecting method in subsurface prospecting. Although CSAMT investigation tools are equipped with new techniques, it must be noted that the models obtained still do not automatically decipher the reality of groundwater in bedrock with very high resistivity con...

The Tuareg shield was assembled by oceanic closures and horizontal movements along mega-shear zones between approximately 20 terranes during the Pan-African Orogeny (750–550 Ma). Although there is an ongoing debate about its origin, the exhumation of the Tuareg Shield is assumed to be related to Cenozoic intraplate volcanism. The Gour Oumelalen is...

The Torak massif located to the west of the Atakor volcanic district is a granitic pluton NNE-SSW elongated and crosscut by several NNW-SSE lineaments. It is intrusive within the S-W Tefedest terrane composed of Eburnean (c. 2 Ga) gneisses and of Pan-African (c. 615 Ma) syntectonic granitic batholiths. New field mapping, petrographic, and mineralog...

Hoggar, as part of the Tuareg shield, is a key area in the assembly of Western Gondwana during the Neoproterozoic. To better understand the tectonic process, 61 broadband magnetotelluric (MT) stations were acquired in Central/Western Hoggar to image the underlying lithosphere. We performed 2-D and 3-D inversions of the impedance tensor and the vert...

The main objective of this study was to model the lithospheric structure of the Manzaz volcanic district (Hoggar) using the magnetotelluric (MT) method. For this purpose, eleven MT stations forming a 70-km long NW-SE profile, intersecting the Manzaz, were modeled. The 2D resistivity model shows an anomalously conductive crust resting on a lithosphe...

The Taessa lavas are located in the Atakor volcanic domain, (Hoggar Algeria). The Atakor district has undergone a significant magmatic activity during the Mio-plio-quaternary, which lead to the outpouring of massive amounts of alkaline lava. This magmatic activity resulted in the reactivation of the Pan-african orogenesis accidents that occured dur...

The Gour Oumelalen (GO) region is located in the northeastern part of the Egere-Aleksod terrane part of the Central Hoggar (Touareg shield, South of Algeria). This key area presents a very important diversity from lithological point of view and also deformation (thrusting, shear zone). Archean and Paleoproterozoic terrains in this region have been...

The orogenic belt of the Hoggar is a product of the assembly of Gondwana. The greatest 4°50' Hoggar Shear zone is also known in Nigeria as Kandi fault and in Brazil as Transbrasiliano lineament (TBL). The Neoproterozoic 4°50' fault played an important role in the structuration of Hoggar during the Panafrican orogeny. It's considered as a major sutu...

Le district du Manzaz fait partie de la province volcanique du Hoggar central; il se situe dans le metacraton LATEA à la limite des blocs d’Azrou N’fad et Tefedest (long. 5°33’E - 6°00’E, lat. 23°45’N et 24°00’N). Le district peut se subdiviser en trois groupes géographiques distincts, oriental (E), occidental (O) et central (C). L’épisode volcaniq...

The 4°50’ lithospheric shear zone represents a major suture zone between the LATEA metacraton (Central Hoggar) characterized by an Archean-paleoproterozoic basement (Bertrand et al., 1986; Peucat et al., 2003) composed in totality by a high grade rocks (amphibolite to granulite facies), and the Iskelterrane corresponding to a panafrican arc materia...

Historically, the Touareg shield is divided into three parts borded by mega-shear zones. Hoggar in southern Algeria with its 550,000 km2 continues for South-West by the Adrar des Iforas Massif in Mali and South-East the Aïr Massif in Niger. The Gour Oumelalen (GO) region is located in the northeastern part of the Egere-Aleksod terrane part of the C...

Notre étude se base essentiellement sur la cartographie et la pétrographie des réseaux de dykes du LATEA central et plus précisément dans certaines régions situées dans les terranes d’Azrou n’fad (Assâdjene), Egéré Aleksod (Adragnamanay) et Tefedest (Takourmiyas). Les données récoltées sur le terrain (Mesures structurales, descriptions et séries d...

Notre étude se base essentiellement sur la cartographie et la pétrographie des réseaux de dykes du LATEA central et plus précisément dans certaines régions situées dans les terranes d’Azrou’N-Fad (Assâdjene), Egéré-Aleksod (Adragnamanay) et Tefedest (Takourmiyas). Les données récoltées sur le terrain (mesures structurales, description et échantillo...