## 4 Results and Discussion  
### Gravimetric Analysis  
Upon examining the Bouguer anomaly map, the first notable observation is a regional gradient characterized by a gradual increase in values from the southeast to the northwest (Figure 3). This trend is likely a result of crustal thinning from the continent to the ocean. These large-scale variations of deep origin, which range from \(-48.5\) mGal to 28.1 mGal, obscure specific gravity signatures, particularly those of low amplitude, such as gradient zones. To better discern these signatures, it is necessary to remove the regional component. The regional component was estimated by a plane calculated using the first-order polynomial regression method [26; 33; 58; 59; 58]. By subtracting this component from the initial data, the residual anomaly map shown in Figure 5 was obtained [20; 58; 59; 94; 95]. A detailed analysis of the resulting residual map reveals several positive (PA1 to PA4) and negative (NA1 and NA2) anomalies with values ranging from \(-16.6\) mGal to \(8.2\) mGal (as seen in Figure 6). These anomalies reflect lateral variations in subsurface density over the study area, which are generated by geological structures of varying sizes, depths, and directions. They are defined as an average background level that is primarily represented by the green and yellow shades characterizing the Neoproterozoic formations of the Ifrni inlier (depicted in Figure 2). The map (Figure 6) is notably dominated by the negative anomaly (NA1), which coincides with relatively low-density crystalline fractured and volcano-sedimentary terrains situated south of the study area. A second negative anomaly is observed to the south of the Mirleft locality, elongated in a NE-SW direction and coinciding with alluvial formations and older sedimentary terrains that could constitute graben fillings and highly fractured crystal formations. The positive anomalies represented by the orange, red, and purple shades occupy the northeastern and southwestern parts of the study area. They are generally superimposed with formations of the Paleozoic cover, primarily composed of Lower and Middle Cambrian carbonate. Raised features of the crystalline basement can explain them  
Figure 6: Residual gravity anomaly map of the Ifni inlier: (1) Axis of a positive anomaly; (2) Axis of negative anomaly. under this cover or by horsts structures. The anomaly (PA1) is situated at the extreme southwest of the study area and is represented by an increase in residual gravity values that reaches a maximum of 8.2 mGal. This anomaly corresponds to the southwestern end of a positive axis that extends further northeast, where its amplitude significantly decreases. It could correspond to a rise in the basement. The positive anomalies PA2, PA3, and PA4, generally NW-SE, coincide with areas of dolomite and limestone cover. They can also be explained by the local rises of the Precambrian basement under the cover. Various filtering procedures were implemented on the residual anomaly map to obtain a comprehensive mapping of geological structures associated with gravity gradient zones. The presence of faults or contacts that separate blocks with different densities and abrupt lithological changes can be indicated by gravity gradients found at transition zones between positive and negative anomalies. To identify areas of interest for hydrogeological investigations of the Ifni inlier, the Total Horizontal Gradient (THG) of the residual anomaly map was calculated, and the maxima were located (as shown in Figure 7a). The structures identified using this filtering technique, including major faults (designated as F1 to F11) and minor faults represented by continuous and dashed lines, varied in length. The results showed that NE-SW trending structures were predominant, intersecting by E-W and NW-SE trending structures in some locations. While some major faults, such as F1, F9, F11, and half of F10, intersected the Paleozoic cover, others mainly affected the Precambrian basement of the Ifni inlier over a few tens of kilometers.