Soulaimani Abderrahmane - Profile on Academia.edu (original) (raw)

Papers by Soulaimani Abderrahmane

Pll: so399-53s2 (97) ooo43-2 oseeassz/sv snoo+ 0.00

Journal of African Earth Sciences, 2014

For over 50 years the Pan African orogeny has been recognized as a Neoproterozoic tectonothermal ... more For over 50 years the Pan African orogeny has been recognized as a Neoproterozoic tectonothermal episode affecting West Africa 800-550 Ma. As such, the Pan African events are similar to the Appalachian orogenic cycle extending from $1100 to 250 Ma and the Cordilleran orogenic cycle of 350 Ma to the present. A significant difference is that the Appalachian orogenic cycle has long been recognized as consisting of separate Grenville, Taconic, Acadian and Alleghenian orogenies. Similarly, the Cordilleran orogenic cycle consists of distinct Antler, Sonoma, Nevadan, Sevier, Laramide and ongoing Cascadian-Andean orogenies. Failure to distinguish individual tectonic events in the Anti-Atlas Mountains has been attributable to the dearth of radiometric dates in this region. Since 2000, precision geochronologic dating in the Anti-Atlas Mountains, Morocco, has provided a means by which it is now appropriate to designate a Pan African orogenic cycle consisting of separate distinct orogenic events. We herein propose the following distinct orogenic events in the Anti-Atlas Mountains of Morocco: Iriri-Tichibanine orogeny (760-700 Ma), Bou Azzer orogeny (680-640 Ma) and the WACadomian orogeny (620-555 Ma).

Application of ASTER remote sensing data to geological mapping of basement domains in arid regions: a case study from the Central Anti-Atlas, Iguerda inlier, Morocco

Arabian Journal of Geosciences, 2013

ABSTRACT Satellite remote sensing is shown to provide critical support for geological and structu... more ABSTRACT Satellite remote sensing is shown to provide critical support for geological and structural mapping in semiarid and arid areas. In this work, Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) data were used to clarify the geological framework of the Precambrian basement of the Iguerda Proterozoic inlier in the Moroccan Central Anti-Atlas. In this study, the interpretation of the processed digital data has been ground truthed with geological field data collected during a reconnaissance-mapping program in the Central Anti-Atlas. The Iguerda inlier offers a deeply eroded Precambrian massif dominated by a Paleoproterozoic basement composed of supracrustal metasedimentary units intruded by various Eburnian granitoids. Impressive mafic dyke swarms mainly of Proterozoic age crosscut this basement. Eburnian basement rocks are unconformably overlain by Lower Ediacaran volcanosedimentary rocks of the Ouarzazate Group and Upper Ediacaran–Lower Cambrian carbonates. The applied ASTER analyses are particularly effective in the lithological differentiation and discrimination of geological units of the Iguerda inlier. The spectral information divergence (SID) classification algorithm coupled with spectral angle mapper and maximum likelihood classification effectively discriminates between metamorphic rocks, granitoid bodies, and carbonate cover. SID classification improves geologic map accuracy with respect to the spatial distribution of plutonic bodies and metamorphic units. In addition, Paleoproterozoic granitoids have been well discriminated into separate distinct suites of porphyritic granites, granodiorites, and peraluminous leucogranite suites. This discrimination was initially identified via remote sensing analysis and later ground truthed in the field. This methodology enhances geological mapping and illustrates the potential of ASTER data to serve as a vital tool in detailed geologic mapping and exploration of well-exposed basement of arid regions, such as the Proterozoic of the Anti-Atlas Mountains of Morocco.

Les marqueurs structuraux et magmatiques de l'extension crustale au Protérozoïque terminal–Cambrien basal autour du massif de Kerdous (Anti-Atlas occidental, Maroc)

Comptes Rendus Geoscience, 2004

During the Late Precambrian–Early Cambrian times, the borders of the Kerdous inlier were affected... more During the Late Precambrian–Early Cambrian times, the borders of the Kerdous inlier were affected by normal faults where thick conglomerates (Ouarzazate Group: PIII), grading progressively upwards into Cambrian marine sediments, were accumulated along their hanging walls. This tectonic activity persisted during the Early Cambrian and was accompanied by a magmatic activity resulting mainly in the emplacement of continental tholeiitic basalts.

Southern Provinces and south-western Anti-Atlas WAC Archean nucleus, Northern Mauritanides, Tarfaya- Laayoune-Boujdour Basin

Circuit 16, Massif de Siroua

2.5-Les gisements de chromite et platinoïdes associés aux ophiolites de Bou Azzer (Anti-Atlas central)

ASTER Visualization and Thematic Classification employing hyper-spectral heuristic approaches to the Geological Mapping of Iguerda-Tayfast Inlier (Central Anti-Atlas, Morocco)

ABSTRACT The Iguerda-Tayfast inlier of Central Anti-Atlas, Morocco constitutes a flat rigid botto... more ABSTRACT The Iguerda-Tayfast inlier of Central Anti-Atlas, Morocco constitutes a flat rigid bottom of crystalline rocks amenable to accuracy mapping with their various rocks. To provide better tools for lithological mapping, this study will be thus related to previous geological work using remote sensing data. The objectives were (1) correct system products to maps can be implemented over limited without calibrated for sensor and offset, nevertheless indicate properties of atmospheric influence as a function of band; and obviously corresponding to the average radiance measured in each pixel, integrating before a process analog to digital signal conversion. (2) Calibrate digital data, remedied to ASTER reflectance relative done with the IAR-reflectance, and followed by another algorithm modelled, to require correction which will make them closer to interpret; ranging from simple -for raw data path radiometric-to data corrected -for selective enhancement and effective target discrimination-. This procedure may not cover all aspect of image processing, but the results what we have, make it useful guide to enhance a workable processing strategy, depending only on the natural of the application. (3) Obtain images with removing the local noise including in every images involving an extra preceding steps with MNF transform. This computational method was coupled with PPI (Purity Pixel Index) and spatial spectral endmember extraction, which can be used for classification and for the computational requirements for subsequent processing. (4)Maximize the differences between a various targets matched with relative reflectance; several geological outcrops derived from the selected signatures identify its own spectral signature, to determinate the difference magnitude between their targets. Hence, the spectral information extraction needs to be distinctively different. (5) According to visual quality assessment with classification algorithms, isolated and micro-sized pixel-clusters representing very sparse outcrops patches were determined as not related to tectonics processes. A Conversion of raster data into vector format within the GIS finally allowed calculating the surface area of every polygon. The mapping revealed several lithological classes of potential extend with high and very high potential poorly represented and previous work and Maps.

The Jbel N'Zourk copper deposit is located in the central Anti-Atlas between the Zenaga and B... more The Jbel N'Zourk copper deposit is located in the central Anti-Atlas between the Zenaga and Bou Azzer-El Graara inliers, and hosted in Adoudounian-Lower Cambrian limestones (Taroudant Group), just above the Jbel Boho volcanic layers. The area has been subjected to E-W Variscan shortening responsible for an eastward-verging thrust. Although being stratabound, the mineralization is controlled by the local tectonic structures.

The Anti-Atlas chain (Morocco): the southern margin of the Variscan belt along the edge of the West African craton

Geological Society, London, Special Publications, 2008

Broadly synchronous circum-Atlantic Variscan–Alleghanian orogenic belts developed during the Late... more Broadly synchronous circum-Atlantic Variscan–Alleghanian orogenic belts developed during the Late Palaeozoic Gondwana–Laurentia collision. In the northern part of the West African craton (WAC), the Variscan orogeny produced basement-controlled structures in the Anti-Atlas, which represents the pericratonic foreland, now located south of the Variscan domains of Morocco and north of the Mauritanides belt. New structural field observations document the strong involvement of the basement and the inversion and folding of the Palaeozoic sedimentary basins at the edge the WAC. Two contrasting domains differently responding to regional NW–SE shortening are recognized: (1) a narrow belt along the Atlantic coast characterized by thin-skinned folding and ESE-vergent thrusting (para-autochthonous Anti-Atlas); (2) a large area between the WAC sensu stricto and the South Atlas front showing huge basement uplifts amidst a folded Palaeozoic cover with upright polyharmonic folds (autochthonous Anti-...

Estudios Geológicos, 2008

Au Viséen supérieur, les bassins mesetiens des Jebilet orientales et d'Azrou Khénifra montrent de... more Au Viséen supérieur, les bassins mesetiens des Jebilet orientales et d'Azrou Khénifra montrent de grandes similitudes de leur évolution tectono-sédimentaire et magmatiques. Leurs dépôts enregistrent de grandes instabilités liées à une tectonique syn-sédimentaire responsable localement d'une intense désorganisation et de grandes variations de faciès et d'épaisseurs. Ces instabilités sont engendrées par une tectonique en blocs basculés qui affecte le substratum anté-Viséen, contrôlée par des accidents bordiers sub-verticaux à forte composante transcurrente. Des corps magmatiques, pour l'essentiel basiques, se mettent en place dans ces bassins. Ils présentent des caractères chimiques des séries magmatiques alcalines mise en place dans un contexte intracontinental et anorogénique. Initiés le long de la zone de transition entre la Meseta orientale et occidentale, les bassins d'Azrou-Khénifra et des Jebilet orientales correspondent à des sillons intracontinentaux, initiés et contrôlés par des décrochements. Leur évolution est sans doute plus précoce et montre un faible taux d'ouverture que celui enregistré dans les bassins adjacents de la meseta occidentale.

Sommaire / Contents tome 338, 2006

Comptes Rendus Geoscience, 2006

Interactions socle/couverture dans l'Anti-Atlas occidental (Maroc): rifting fini-Protérozoïque et orogenèse hercynienne

Université Cadi Ayyad, Marrakech, 1998

Molasses Panafricaines, Ou Marqueurs D'Un Rifting Fini-Protérozoïque?

Comptes rendus de l'Académie des sciences: Earth & planetary sciences. Sciences de la terre et des planètes, 1999

The Late Proterozoic PIII conglomerates of the Anti Atlas (southern Morocco). Their relationships with the Panafrican orogeny or a Late Proterozoic rifting episode

Comptes Rendus de l'Academie des Sciences Series IIA Earth and Planetary Science, Mar 30, 1999

Abstract: By their petrographic and sedimentary characters, the detrital rocks of the PIII (Late ... more Abstract: By their petrographic and sedimentary characters, the detrital rocks of the PIII (Late Proterozoic) studied in the Anti Atlas (southern Morocco) suggest that their deposition was controlled by normal faults. These faults were active several tens of My after the Moroccan Panafrican deformation. They are the markers of a rifting episode that is indicated on the other hand by magmatic activity, calkaline, tholeiitic then alkaline, at the Proterozoic-Cambrian limit. Les caracteres petrographiques et sedimentaires des conglomerats du ...

U-PB Geochronology of Dyke and Sill Swarms of the West African Craton (Anti-Atlas Inliers): Possible Links to Break-Up of Precambrian Supercontinents

156 U-PB GEOCHRONOLOGY OF DYKE AND SILL SWARMS OF THE WEST AFRICAN CRATON (ANTI-ATLAS INLIERS): P... more 156 U-PB GEOCHRONOLOGY OF DYKE AND SILL SWARMS OF THE WEST AFRICAN CRATON (ANTI-ATLAS INLIERS): POSSIBLE LINKS TO BREAK-UP OF PRECAMBRIAN SUPERCONTINENTS Nasrrddine Youbi1, 2, 3, Ulf Söderlund4, 5, Richard Ernst6, 7, Abderrahmane Soulaimani1, Ahmid Hafid8, Moha Ikenne9, Djiky Kouyaté1, Abdelhakim El Bahat9, M&amp;amp;amp;amp;amp;amp;#x27;hamed El Janati1, Hervé Bertrand10, and Khalid Rkha Chaham1. 1. Geology Dept., Fac. of Sciences-Semlalia, Cadi Ayyad University, Marrakech, Morocco 2. National Centre for Studies and Research on the ...

Le plateau de Lakhssas (Anti Atlas Occidental, Maroc): Un graben finiprécambrien réactivé à l’hercynien

A historical overview of Moroccan magmatic events along northwest edge of the West African Craton

Journal of African Earth Sciences, 2016

Abstract Located along the northwestern edge of the West African Craton, Morocco exhibits a wide ... more Abstract Located along the northwestern edge of the West African Craton, Morocco exhibits a wide variety of magmatic events from Archean to Quaternary. The oldest magmatic rocks belong to the Archean Reguibat Shield outcrops in the Moroccan Sahara. Paleoproterozoic magmatism, known as the Anti-Atlas granitoids, is related to the Eburnean orogeny and initial cratonization of the WAC. Mesoproterozoic magmatism is represented by a small number of mafic dykes known henceforth as the Taghdout mafic volcanism. Massive Neoproterozoic magmatic activity, related to the Pan-African cycle, consists of rift-related Tonian magmatism associated with the Rodinia breakup, an Early Cryogenian convergent margin event (760–700 Ma), syn-collisional Bou-Azzer magmatism (680–640 Ma), followed by widespread Ediacaran magmatism (620–555 Ma). Each magmatic episode corresponded to a different geodynamic environment and produced different types of magma. Phanerozoic magmatism began with Early Cambrian basaltic (rift?) volcanism, which persisted during the Middle Cambrian, and into the Early Ordovician. This was succeeded by massive Late Devonian and Carboniferous, pre-Variscan tholeiitic and calc-alkaline (Central Morocco) volcanic flows in basins of the Moroccan Meseta. North of the Atlas Paleozoic Transform Zone, the Late Carboniferous Variscan event was accompanied by the emplacement of 330–300 Ma calc-alkaline granitoids in upper crustal shear zones. Post-Variscan alkaline magmatism was associated with the opening of the Permian basins. Mesozoic magmatism began with the huge volumes of magma emplaced around 200 Ma in the Central Atlantic Magmatic Province (CAMP) which was associated with the fragmentation of Pangea and the subsequent rifting of Central Atlantic. CAMP volcanism occurs in all structural domains of Morocco, from the Anti-Atlas to the External Rif domain with a peak activity around 199 Ma. A second Mesozoic magmatic event is represented by mafic lava flows and gabbroic intrusions in the Internal Maghrebian flysch nappes as well as in the external Mesorif. This event consists of Middle-Upper Jurassic MORB tholeiites emplaced during opening of the Alpine Tethys ocean. The Central High Atlas also records Early Cretaceous alpine Tethys magmatism associated with the aborted Atlas rift, or perhaps linked to plume activity on the edge of the WAC. Cenozoic magmatism is associated with Tertiary and Quaternary circum-Mediterranean alkaline provinces, and is characterized by an intermittent activity over 50 Ma from the Anti-Atlas to the Rif Mountain along a SW–NE volcanic lineament which underlines a thinned continental lithosphere.

Notice explicative carte géologie Maroc (1/50,000), feuille d'Alougoum