The buried Variscan granites and associated structures in the High Moulouya basin from gravity data and their role during the Triassic-Liassic extensional tectonics (Moroccan Meseta-Atlas domain).

Elabouyi, Mustapha; Yaagoub, Driss; Driouch, Youssef; Dahire, M.; Qarqori, Khaoula; Manar, Ahmed; Ntarmouchant, A.; Jeddi, M.; Elkourchia, A.; Laguenini, F.; Mali, B.; Hinaje, Saïd; Belkasmi, Mohammed

doi:10.1016/j.jafrearsci.2022.104597

Cited by 8 publications

(7 citation statements)

References 70 publications

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“…First, we removed the regional anomaly and used the total horizontal gradient and Tilt derivative filters as powerful techniques for mapping subsurface geological structures To obtain comprehensive information about the spatial arrangement of tectonic structures relevant to hydrogeology in the study area, we used Geosoft mapping and processing software to subject the gravity data to a series of mathematical treatments. First, we removed the regional anomaly and used the total horizontal gradient and Tilt derivative filters as powerful techniques for mapping subsurface geological structures [19,20,26,28,[58][59][60][61][62][63][64]. Next, we applied Euler Deconvolution to determine the depth location of faults and trace their connection with basement structures [26,54].…”

Section: Gravity Prospectionmentioning

confidence: 99%

“…The Total Horizontal Gradient (THG) technique is commonly used to locate subsurface discontinuities. It is particularly effective in identifying gradient zones associated with geological contacts or faults [26,35,58,59,61]. These gradient zones indicate boundaries between blocks of varying densities, and maxima typically indicate them (Figure 4a).…”

Section: The Total Horizontal Gradientmentioning

confidence: 99%

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Contribution of Gravity Data for Structural Characterization of the Ifni Inlier, Western Anti-Atlas, Morocco: Hydrogeological Implications

et al. 2023

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The Sidi Ifni region in southwest Morocco is mainly composed of crystalline rocks with limited groundwater storage capacity. These water resources drain in particular fault zones with high fracture permeability. The main objective of this study is to describe the geological structure of the region to optimize future drilling locations. The gravity data were processed using various techniques, such as total horizontal gradient, tilt derivative, and Euler deconvolution, in conjunction with the interpretation of the geological data, to create a new structural map. This map confirms the presence of many previously identified or inferred faults and identifies significant new faults with their respective trends and depths. Analysis of this map shows that major faults are oriented NNE-SSW and NE-SW, while minor faults are oriented E-W, NW-SE, and NNW-SSE. The superposition of the hydrogeological data and the structural map reveals that the high groundwater flow values in the boreholes are located in the vicinity of the major faults and talwegs. The structures deduced from the filtering and interpretation of the gravity data suggest that the hydrogeological system of the Ifni Inlier is controlled by its structures. To confirm this impact, a high-resolution electrical resistivity map (7200 Hz) was used, with penetration depths ranging from 84 to 187 m. Negative boreholes, located in high resistivity ranges corresponding to sound basement formations without fault crossings, showed high resistivity values. The positive holes, located in anomalies with low linear resistivity, revealed the impact of fault crossings, which drain water and tend to decrease the resistivity values of the formations. Therefore, these new structural maps will assist in planning future hydrogeological studies in this area.

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Section: Gravity Prospectionmentioning

confidence: 99%

Section: The Total Horizontal Gradientmentioning

confidence: 99%

Contribution of Gravity Data for Structural Characterization of the Ifni Inlier, Western Anti-Atlas, Morocco: Hydrogeological Implications

et al. 2023

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“…à deux micas des Perdreaux et du Poulet, migmatites et granites à cordiérite de Sidi Saïd). L'ensemble de ces granitoïdes constituent, avec ceux de Boumia et de Kerrouchen à l'Ouest, un seul batholithe partiellement caché par les formations méso-cénozoïques avec une superficie de 2400 km 2 environ (Batholite de la Haute Moulouya: Elabouyi et al, 2022). Le Batholite de la Haute Moulouya et son encaissant épimétamorphique sont recoupés tardivement par un réseau de dykes de puissance décimétrique à métrique scellés par les séries triasico-liasiques (Fig.…”

Section: Cadre Géologiqueunclassified

Analyse structurale et reconstitution des paléochamps de contraintes tardi-hercyniens dans la boutonnière d’Aouli (massif de la Haute Moulouya, Maroc)

2023

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[fr] La boutonnière d’Aouli fait partie du massif de la Haute Moulouya situé à la jonction du Moyen Atlas et du Haut Atlas central où affleurent un socle paléozoïque et une couverture méso-cénozoïque discordante. Le but de ce papier est de décrire les principaux systèmes de failles et fractures qui ont contribué à la structuration de la région durant son évolution tectonique, ainsi que la reconstitution des paléochamps de contraintes au cours de la période tardi-hercynienne. Ceci en utilisant une approche multidisciplinaire avec des levés et mesures de terrain associés aux calculs des tenseurs de contraintes. L’analyse structurale nous a permis de distinguer des accidents principaux affectant le socle paléozoïque et sa couverture méso-cénozoïque à l’échelle plurikilométrique, ainsi que des accidents secondaires dont l’influence ne s’observe qu’à l’échelle des centaines de mètres à quelques kilomètres. La distribution spatiale de ces failles montre les systèmes de directions suivants: (i) le système NNE-SSW à NE-SW; (ii) le système ENE-WSW à E-W; (iii) le système WNW-ESE à NW-SE et (iv) le système NNW-SSE à N-S. La reconstitution des paléochamps de contraintes tardi-hercyniens nous a permis de mettre en évidence une phase de déformation cassante compatible avec un régime tectonique régional décrochant à transpressif. Cette phase est caractérisée par un axe de contrainte maximal σ1 subhorizontal à horizontal avec une direction subméridienne et un axe minimal σ3 également subhorizontal à horizontal avec une direction subéquatoriale. Ce régime tectonique est responsable du jeu décrochant senestre des failles NNE-SSW à NE-SW, dextre des failles NW-SE et décrochevauchant des failles ENE-WSW à E-W, ainsi que l’apparition de fentes de tension subméridiennes.

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“…Under sedimentary basins and structural frameworks, the gravity method is ideally suited for basement mapping (Saleh et al, 2018;Frifita et al, 2020;Araffa et al, 2021;Kebede et al, 2021;Pham LT. et al, 2022;Zaghdoudi et al, 2020;Elabouyi et al, 2022;Mohamed et al, 2022a;Eldosouky et al, 2022b;Saada et al, 2021). Several field studies estimated sediment thickness and geological and stratigraphical structure.…”

Section: Introductionmentioning

confidence: 99%

“…Zaghdoudi et al (2021) employed gravity and seismic data to map Tunisia's Bizerte geology. Elabouyi et al (2022) examined buried granite masses and structures in Morocco's High Moulouya basin using gravity measurements. Alqahtani et al (2023a) performed a study to identify the potential geothermal resources in Rahat Volcanic field (kingdom of Saudi Arabia) using gravity and magnetic data.…”

Section: Introductionmentioning

confidence: 99%

Application of enhanced methods of gravity data analysis for mapping the subsurface structure of the bahira basin in Morocco

et al. 2023

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Gravity-based imaging of the subsurface has increased worldwide recently. Improvements in the processing and analysis of gravity data have allowed us to locate the basement surface, map geologic basins, and define structural patterns. In this study, gravity data were analyzed to study the Bahira basin’s underlying geology. The Bahira basin is very important economically. The Ganntour plateau is distinctive due to the importance of the phosphate mining resources. Using gravity data, we mapped the subsurface and determined the underlying structural patterns that affect the study area. In this study, we used several techniques to edge detection including Total horizontal derivative (THDR), first vertical derivative (FVD), tilt derivative (TDR), and its horizontal derivative (THDR_TDR) methods. Accordingly, the geological history of the Bahira basin suggests that the main lineaments/faults trends are NE-SW, NW-SE, ENE-WSW, and WNW-ESE. The 3D Euler deconvolution showed the depth and location of lineaments/faults, and matched edge detection results. The eastern Bahira basin’s sedimentary layer is 2–8 km deeper according to the Euler technique. Two-dimensional forward modeling along three profiles in the Bahira basin revealed a horst-graben basement structure. The outcomes of this study improved the subsurface topographical variations of the Bahira Basin. The information collected so far can help future studies in the area.

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The buried Variscan granites and associated structures in the High Moulouya basin from gravity data and their role during the Triassic-Liassic extensional tectonics (Moroccan Meseta-Atlas domain).

Cited by 8 publications

References 70 publications

Contribution of Gravity Data for Structural Characterization of the Ifni Inlier, Western Anti-Atlas, Morocco: Hydrogeological Implications

Contribution of Gravity Data for Structural Characterization of the Ifni Inlier, Western Anti-Atlas, Morocco: Hydrogeological Implications

Analyse structurale et reconstitution des paléochamps de contraintes tardi-hercyniens dans la boutonnière d’Aouli (massif de la Haute Moulouya, Maroc)

Application of enhanced methods of gravity data analysis for mapping the subsurface structure of the bahira basin in Morocco

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