The Atlas System

Lamotte, Dominique Frizon de; Zizi, Mahmoud; Missenard, Yves; Hafid, Mohamad; Azzouzi, M. El; Maury, René C.; Charrière, André; Taki, Z.; Benammi, Mohamed; Michard, André

doi:10.1007/978-3-540-77076-3_4

Cited by 119 publications

(125 citation statements)

References 131 publications

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“…Jacobshagen (1992) described two principal faults, the South Atlas Fault (SAF) NE-SW to E-W and the Translaboran Fault (TAF) trending NE-SW. Piqué & Laville (1993) (Laville & Fedan, 1989). The major stage of tightening and the uprising relief are beginning from the Eocene-Paleocene age and continued during Miocene (Frizon de Lamotte et al, 2008). The main faults trending N70 to EW are described as main thrust faults of the Atlas belt.…”

Section: Discussionmentioning

confidence: 96%

“…Concerning the age of the fractures, the first three principal directions NE-SW, ENE-WSW and WNW-ESE, have been described in the literature as faults that controlled the sedimentation during the Trias and Lower Lias age (Bouchouata et al, 1995;Frizon de Lamotte et al, 2008). Those faults are reactivated during the different phases of the Atlas structuration as reverse fault.…”

Section: Discussionmentioning

confidence: 99%

“…All the anterior research done in this area is a structural, sedimentary and petrography geology (Frizon de Lamotte et al 2008;Bougadir & Bouabdelli, 1994. Ibouh et al, 19942003).…”

Section: Introductionmentioning

confidence: 99%

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Análisis de fracturas geológicas extraídas por teledetección en imágenes Landsat TM, ejemplo de la zona de Imilchil-Tounfite (Alto Atlas central, Marruecos)

et al. 2016

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The use of remote sensing, in this research, can be summarized in mapping and statistical studies of lineaments on the satellites images of the Jurassic outcrops in the Imilchil-Tounfite area, Central High Atlas of Morocco. This is to apply various manual techniques for extracting lineaments from Landsat TM image. Analytical techniques used in this work are: the principal component analysis (PCA) applied to selective bands of the visible and infrared, which allows creating new images with better visual interpretation. Directional filters N0°, N45°, N90°, and N135° with a 5×5 matrix were used to enhance lineaments in the corresponding perpendicular directions, and therefore to obtain a good discrimination of those structures. Preliminary results highlight a dominant geological fracturing trending ENE/WSW with 52% of the total lineaments, a second fracture trending is WNW/ESE at 23%, a third fracture series trending NE/SW with 20% and finally, a minor series of fractures trending NW/SE with 5% of the total lineaments. Distribution and statistical relationship, between fractures and the affected surface on the one hand and the fracture length on the other hand, shows a network of well-structured fractures. The final lineament map constitutes a contribution to complete the geology and assisting the mining and hydrogeological prospection, in the Imilchil-Tounfite area.

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Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

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Análisis de fracturas geológicas extraídas por teledetección en imágenes Landsat TM, ejemplo de la zona de Imilchil-Tounfite (Alto Atlas central, Marruecos)

et al. 2016

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“…These young mountains were uplifted during the Cenozoic as a result of the Alpine orogeny, such as the Rif Mountains to the north. However, the High and Middle Atlas thrust-fold belts were created by the tectonic inversion of pre-existing extensional basins of Triassic-Jurassic age [4], [5], [21]- [27]. Compared to the Alpine-type, collisional Rif belt, the Atlas system is an intracontinental, autochthonous system, developed over a continental crust, which was only slightly thinned during its pre-orogeny evolution.…”

Section: Geological Settingmentioning

confidence: 99%

New numerical and theoretical model to characterize the upper crustal structure of the Moroccan atlas from wide-angle seismic reflection data

Ouraini¹,

Gueraoui²,

Ayarza³

et al. 2015

ces

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“…At depth, it is noteworthy that there is a lithospheric thermal dome beneath the High and Middle Atlas and the Rif, that reaches the Agadir area to the west (Frizon de Lamotte et al, 2008). It would be very possible that this anomaly extends to the west and then to the Canary Islands; however, the problem cannot be assessed without a detailed geophysical study and especially by collecting geothermal data along the Tarfaya margin (A. Rimi, pers.…”

Section: Regional Extent Of the South Atlas Frontmentioning

confidence: 99%

Structure of the Kasbah fold zone (Agadir bay, Morocco). Implications on the chronology of the recent tectonics of the western High Atlas and on the seismic hazard of the Agadir area

Mridekh¹,

Medina²,

Mhammdi³

et al. 2009

Estud. geol.

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Detailed re-interpretation of the north-eastern segment of a profile realized across the Agadir bay along a NE-SW trend and crosscutting the main structures, together with analysis of available isochron maps, allowed us to retrace the geological history of the offshore western High Atlas. Two tectonostratigraphic sequences were distinguished: Unit II, which displays a simple structure, laying unconformably on Unit I, with a more complex structure dominated by a reverse fault (F1) striking E-W with a dip to the north. Correlation to boreholes Souss-1 and AGM-1 allowed us to assign Unit I to the Triassic – Palaeogene and Unit II to the Miocene – Present. The NE fault block shows a ramp-flat fault plane (F2) with an overlying SW-vergent fold that can be interpreted as a fault-bend fold. Three main stages were distinguished: (1) during the Cretaceous, F1 could have been a syndepositional normal fault with the NE block moving downwards; (2) towards the beginning of the Tertiary, the displacement of plane F2 induced the development of a fault-bend fold and erosion of the forelimb and hinge of the fold; displacement along F2 was transferred to fault F1; (3) afterwards, during the Miocene, reverse motion of F1 deformed and tilted the plane F2 and accentuated the folded structure. This evolution is typical for a frontal basin above a fault-related fold. Evaluation of the thickness and bed depth differences shows that the largest growth rate was recorded in Late Miocene times. Seismic activity recorded in the Agadir bay appears to be clearly related to this fault zone, as inferred from focal mechanisms. Seismic moment evaluation suggests that earthquakes of magnitude Mw≥6 are likely to occur, but could not be much larger because of the fault segmentation geometry of the High Atlas Front.<br><br>A partir de una detallada reinterpretación del segmento nororiental de un perfil que corta las principales estructuras de la bahía de Agadir a lo largo de una directriz NE-SW, y un análisis de los mapas de isocronas disponibles, se ha podido establecer la historia geológica de la costa del Alto Atlas occidental. En primer lugar, se han distinguido dos secuencias tectonoestratigráficas: la Unidad II, que muestra una estructura simple, y la Unidad I, de estructura más compleja dominada por una falla inversa (F1) de dirección E-W vergente al norte, sobre la que se dispone la Unidad II de forma discordante. La correlación con los sondeos Souss-1 y AGM-1 ha permitido asignar la Unidad I al Triásico-Paleógeno y la Unidad II al Mioceno-Presente. El bloque NE de la falla muestra un plano de falla de tipo rampa-rellano (F2) con un pliegue superpuesto vergente al SW que puede ser interpretado como un pliegue de flexión de falla. Respecto a su evolución temporal, se han distinguido tres estadios: 1) Durante el Cretácico, F1 pudo haber sido una falla normal sindeposicional, con el bloque NE desplazándose hacia abajo; 2) Al comienzo del Terciario, el desplazamiento del plano F2 indujo el desarrollo de un pliegue de flexión de falla y...

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The Atlas System

Cited by 119 publications

References 131 publications

Análisis de fracturas geológicas extraídas por teledetección en imágenes Landsat TM, ejemplo de la zona de Imilchil-Tounfite (Alto Atlas central, Marruecos)

Análisis de fracturas geológicas extraídas por teledetección en imágenes Landsat TM, ejemplo de la zona de Imilchil-Tounfite (Alto Atlas central, Marruecos)

New numerical and theoretical model to characterize the upper crustal structure of the Moroccan atlas from wide-angle seismic reflection data

Structure of the Kasbah fold zone (Agadir bay, Morocco). Implications on the chronology of the recent tectonics of the western High Atlas and on the seismic hazard of the Agadir area

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