About
52
Publications
12,731
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
397
Citations
Publications
Publications (52)
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...
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...
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...
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...
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...
Essential minerals, namely: quartz, plagioclage (albite-oligoclase), alkaline feldspar (orthose and microcline), micas (protolithionite to Sidérophyllite group, phengite to Li-phengite group).
The Azrou volcanic district, located to the south-east to the Atakor district in the Hoggar, has a landscape is governed by a number of felsic volcanic highs and dissected mafic plateau lavas.Our new Rb-Sr age (i.e. 23.1 ± 1.6 Ma) indicates that the Azrou felsic lavas are contemporaneous with the Achkal ring complexes (Anahef region). The Azrou fel...
The Manzaz volcanic district is a part of the Hoggar Cenozoic volcanic province. The Neogene volcanic activity was mainly caused by reactivation of mega-shear zones crossing the Tuareg Shield, trending either North-South, inherited from Pan-African transcurrent faults, or SE- NW and SW-NE, formed during the Mesozoic. Tephra, ash and tuffs, deposite...
Les Mégacristaux d’olivine, pyroxène, amphibole et feldspath ont été retrouvés dans trois volcans de la région de Manzaz (Hoggar central). Leurs compositions chimiques sont utilisées pour estimer les conditions de cristallisation et déterminer leur (s) source (s) possible (s).
Dans le Hoggar central, les intrusions mafiques-ultramafiques ont suscité peu d’études, à l’exception des intrusions litées de Laouni (Cottin et al. 1998) d’âge édiacarien (troctolite à 631 Ma, Bowden et al. 2014) et du massif d’Allioum localisé dans la Tefedest et intrusif dans la granodiorite d’In Ozzaf (639 ± 12 Ma, Vitel 1979, Ikhlef-Debabha 20...
Le Hoggar est le siège d’une importante activité magmatique qui se manifeste de l’Eocène au Quaternaire (Dautria, 1988, Liégeois et al., 2005, Azzouni et al., 2007), au cours de laquelle se mettent en place d’importants volumes de laves tholéitiques, alcalines et hyperalcalines, saturées et soussaturées. Ce volcanisme comprend plusieurs necks, dôme...
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...
Le massif du Manzaz (1500 km²) fait partie de la province volcanique cénozoïque du Hoggar, limité par les méridiens 5°33'et 6°00'E et les parallèles 23°45'et 24°00'N. Il se situe dans le méta-craton LATEA à la limite des terranes d'Azrou N'Fad et de la Tefedest. Ses laves se sont épanchées à partir du Miocène sur un socle relativement plat, constit...
CONTEXTE DE MISE EN PLACE DU VOLCANISME CENOZOIQUE DU HOGGAR : APPORT DE LA GEOPHYSIQUE ET DE L'IMAGERIE SATELLITALE
Le bouclier touareg est un immense domaine précambrien qui s’étend sur plus de 500 000 Km². Il comprend le Hoggar, en Algérie, l’Adrar des Iforas, au Mali et l’Aïr au Niger. Différents évènements, qui se rattachent aussi bien à l'Archéen qu'à l'Eburnéen et au Pan-Africain, y ont été́ reconnus. Mais c'est essentiellement à cette dernière orogenèse q...
La mise en place des volcans du Manzaz a été favorisée par la rhéologie du métacraton LATEA qui se traduit par la présence de fractures de différentes directions, même si elles n’apparaissent pas toujours clairement sur le terrain. Elles ont été mises en évidence par l’utilisation de méthodes géophysiques et de la télédétection « SRTDM ». La méthod...
PREMIÈRES DONNÉES CARTOGRAPHIQUES SUR L’ASSOCIATION ACIDE-BASIQUE (MASSIF GRANITIQUE DE TAESSA-COMPLEXE MAFIQUE ULTRAMAFIQUE D’EDIKEL), TERRANE DE LAOUNI (LATEA, HOGGAR CENTRAL, ALGÉRIE)
F. IKHLEF DEBABHA1-3, A. AZZOUNI SEKKAL2-3, A. BENHALLOU 1-3, R. BEN EL KHAZNADJI 3
1-CRAAG, Centre de Recherche en Astronomie, Astrophysique et Géophysique, Route...
PREMIÈRES DONNÉES CARTOGRAPHIQUES SUR L’ASSOCIATION ACIDE-BASIQUE (MASSIF GRANITIQUE DE TAESSA-COMPLEXE MAFIQUE ULTRAMAFIQUE D’EDIKEL), TERRANE DE LAOUNI (LATEA, HOGGAR CENTRAL, ALGÉRIE)
F. IKHLEF DEBABHA1-3, A. AZZOUNI SEKKAL2-3, A. BENHALLOU 1-3, R. BEN EL KHAZNADJI 3
1-CRAAG, Centre de Recherche en Astronomie, Astrophysique et Géophysique, Route...
PREMIÈRES DONNÉES CARTOGRAPHIQUES SUR L’ASSOCIATION ACIDE-BASIQUE (MASSIF GRANITIQUE DE TAESSA-COMPLEXE MAFIQUE ULTRAMAFIQUE D’EDIKEL), TERRANE DE LAOUNI (LATEA, HOGGAR CENTRAL, ALGÉRIE)
F. IKHLEF DEBABHA1-3, A. AZZOUNI SEKKAL2-3, A. BENHALLOU 1-3, R. BEN EL KHAZNADJI 3
1-CRAAG, Centre de Recherche en Astronomie, Astrophysique et Géophysique, Route...
Le Hoggar est le siège d’une importante activité magmatique de l’Eocène au Quaternaire au cours de
laquelle se sont mises en place d’importants volumes de laves tholéitiques, alcalines et hyperalcalines,
saturées et sous-saturées. Ce volcanisme se localise le long des grands accidents d’échelle lithosphérique qui
séparent le plus souvent certains t...
The Aïn Kahla basalts belong to a Neoproterozoic crystalline complex, situated north-west of the Hoggar, in contact with the Arak major fault, which constitutes nowadays a structural limit between the Ahnet and Mouydir Paleozoïc basins. It is composed of a strongly deformed metamorphic basement, related to the Pharusien of Hoggar, and magmatic rock...
The Atakor massif is a part of the Hoggar volcanic province, which was emplaced on top of a basement swell initiated during the Cretaceous. There have been three main episodes of volcanic activity since the Miocene, separated by long periods of qui- escence. The lava fl ows and domes were emitted along lithosphere-scale fault zones. With its famous...
The mantle xenoliths included in Quaternary alkaline volcanics from the Manzaz-district (Central Hoggar) are proto-granular, anhydrous spinel lherzolites. Major and trace element analyses on bulk rocks and constituent mineral phases show that the primary compositions are widely overprinted by metasomatic processes. Trace element modelling of the me...
The mantle xenoliths included in Quaternary alkaline volcanics from the Manzaz-district (Central Hoggar) are proto-granular, anhydrous spinel lherzolites. Major and trace element analyses on bulk rocks and constituent mineral phases show that the primary compositions are widely overprinted by metasomatic processes, which however are not reflected b...
Major and trace element analyses on bulk rocks and constituent minerals, and Sr-Nd-Pb isotopic analyses on clinopyroxene separates have been carried out on mantle xenoliths included in Pliocene-Quaternary alkaline volcanics from the Manzaz-Atakor District (Hoggar, Algeria). Most of the xenoliths are protogranular-textured spinel-lherzolites (modal...
We review the northwest African Cenozoic volcanic fields, including their regional
geology. This provides a basis for understanding the relations between Hoggar volcanism
and the Africa-Europe collision. Volcanic alignments are related to structural
features, and no spatial age trend exists. In Hoggar, a close link is established between
the volcan...
The area located to the North of Tamanrasset (Hoggar) was marked by volcanic activity during the Miocene,
Pliocene, Quaternary period. Among the recent volcanic areas of Hoggar, two of them, Atakor (2150 km²,
80 km north of Tamanrasset) and Manzaz (1500 km²) north again are well known . Each of them is
characterized by the presence of a considerabl...
Th e Tertiary Hoggar volcanic province was emplaced on top of a swell initiated during the Cretaceous. Three main episodes of volcanic activity are identified in the Oligocene, the Miocene and the Plio-Quaternary. The lava fl ows and dames were emitted along lithosphere-scale fault zones. The Atakor massif is one of the largest volcanic districts....
The Archaean to Palaeoproterozoic West African craton is surrounded by terrains remobilised and/or accreted during the Neoproterozoic Pan-African orogeny (750-520 Ma), among which the Tuareg Shield is composed of 23 recognized terranes that welded together. Final convergence occurred mainly during the 620 - 580 Ma periods with the emplacement of hi...
Since the Mesozoic, the northern edge of the African Plate has been the locus for widespread magmatic activity. The Hoggar of the Saharan Desert is located above a lithospheric
bulge and is famous for its Cenozoic volcanic episodes.
During this period of time, markedly alkaline lava flows were repeatedly erupted. The Tahifet area located at the sou...
The Hoggar is well known for its very important late magmatic activity in the Cenozoic. during that period a big amount of typical alkali lavas took place. The Tahifet area, which is situated along the South East boundary of the volcanic massif of Atakor(Central Hoggar), seems to belong to this kind of volcanism. The area shows an eruptive activity...
