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<p>The <i>Rehamna</i> Massif is located in the southwestern <i>Moroccan</i> Meseta. This study area is for its diverse geologic events and mineral richness. By comparison, the <i>Jbilet</i> Massif, which lies in the immediate vicinity of the <i>Rehamna</i>, is well known for its rich vein deposits of copper, gold and silver. Preliminary observations suggest that the outcropping geologic structures of the <i>Rehamna</i> Massif may follow orientations similar to those of the <i>Jbilet</i> faults. This indicates that analogous tectonic processes may have influenced the formation of mineral deposits in both Massifs, offering significant potential for mineral discoveries in the <i>Rehamna</i>. To highlight potential mineral-rich zones in the <i>Rehamna</i> Massif, we conducted a geophysical study combined to a field research. While the field study is predicated on the map of mineral showings, the geophysical treatment depends on both gravity and residual magnetic data. It was possible to identify deep prospective magmatic features, primarily granitic plutons and vein bodies thought to be connected to the main NNE-SSW trending faults, by looking at the potential maps of the research area. They are the causative sources of the anomalies shown in the potential fields maps. To inspect these anomalies, several treatments were applied to the magnetic and gravity data, respectively. Starting by the reduction-to-pole of the magnetic data to situate the anomalies over their causative sources, generating then the reduced-to-pole map (RTP). As for the gravity data, it was necessary to extract the residual field map of the <i>Bouguer</i> anomaly map using a first-degree polynomial surface. The RTP map and residual gravity-field map have been upwarded to 30&#xa0;km, and then submitted to the titlt-angle transformation employing the <i>Oasis Montaj</i> Software. The analysis of titlt-angle transformation outcome reveals the presence of subsurface lineaments in the <i>Rehamna</i>. The field structural data indicate that these lineaments represent the geologic borders between the host rocks and the magmatic formations, the primary faults and dykes that trend from N-S to NE-SW. By determining the vertical extent of underlying geologic formations, we were able to update the region’s geologic maps based on these findings in conjunction with the mineral showings maps. Second, through superposing the mineral showings on the geophysical anomalies, it was possible to identify the deep geometry of the silver/gold-rich granitic bodies of the area, currently exploited in the surface, in the mining district of <i>Oulad Hassine</i> in the southeast of <i>Skhour Rehamna</i>.</p>

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Contribution of aeromagnetic and gravimetric data analysis to the study of geologic structures and deposits of the Rehamna massif (Western Meseta — Morocco)

  • 期刊论文

  • 发表日期：

    2025年3月18日

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  • Kawtar Benyas,
  • Assia Idrissi,
  • Abdellatif Aarab,
  • Abdelmounim Qarbous,
  • Slimane Sassioui,
  • Walid Farhi,
  • Abdellah Lakhloufi,
  • Ahmed Manar,
  • Mounir AMAR

摘要

The Rehamna Massif is located in the southwestern Moroccan Meseta. This study area is for its diverse geologic events and mineral richness. By comparison, the Jbilet Massif, which lies in the immediate vicinity of the Rehamna, is well known for its rich vein deposits of copper, gold and silver. Preliminary observations suggest that the outcropping geologic structures of the Rehamna Massif may follow orientations similar to those of the Jbilet faults. This indicates that analogous tectonic processes may have influenced the formation of mineral deposits in both Massifs, offering significant potential for mineral discoveries in the Rehamna. To highlight potential mineral-rich zones in the Rehamna Massif, we conducted a geophysical study combined to a field research. While the field study is predicated on the map of mineral showings, the geophysical treatment depends on both gravity and residual magnetic data. It was possible to identify deep prospective magmatic features, primarily granitic plutons and vein bodies thought to be connected to the main NNE-SSW trending faults, by looking at the potential maps of the research area. They are the causative sources of the anomalies shown in the potential fields maps. To inspect these anomalies, several treatments were applied to the magnetic and gravity data, respectively. Starting by the reduction-to-pole of the magnetic data to situate the anomalies over their causative sources, generating then the reduced-to-pole map (RTP). As for the gravity data, it was necessary to extract the residual field map of the Bouguer anomaly map using a first-degree polynomial surface. The RTP map and residual gravity-field map have been upwarded to 30 km, and then submitted to the titlt-angle transformation employing the Oasis Montaj Software. The analysis of titlt-angle transformation outcome reveals the presence of subsurface lineaments in the Rehamna. The field structural data indicate that these lineaments represent the geologic borders between the host rocks and the magmatic formations, the primary faults and dykes that trend from N-S to NE-SW. By determining the vertical extent of underlying geologic formations, we were able to update the region’s geologic maps based on these findings in conjunction with the mineral showings maps. Second, through superposing the mineral showings on the geophysical anomalies, it was possible to identify the deep geometry of the silver/gold-rich granitic bodies of the area, currently exploited in the surface, in the mining district of Oulad Hassine in the southeast of Skhour Rehamna.