# Detection of Mineralization Zones Using Aeromagnetic Data
## 4 Results and Discussion  
There is not much difference between the RTP map and the TMI map (Figure 3), except that several anomalies change their direction northward due to the elimination of the study area's declination. The anomalies' forms are also centered over their respective causal bodies. By looking at the RTP map, we can see that the magnetic intensity range is between 41,833 and 43,330 nT. As a result of the magnetized rocks in the region, the investigated region is distinguished by high and low magnetic anomalies of both low and high frequencies; the high magnetic anomalies have high magnetic susceptibilities due to the high iron content within ophiolitic serpentinite rocks, ophiolitic basic and metavolcanic rocks, and gabbroic rocks, whereas the low magnetic anomalies are due to the presence of quaternary alluvium deposits, felsic rocks (Calc-alkaline), and intermediate-to-acid metavolcanic and metapyroclastic rocks. Figure 2: Methodology flow chart of the study. The significant magnetic anomalies (pink color) in the northeastern portion of the study region are attributed to the mineralization belt (Barramiya-Um Saltit belt) linked with the NE-SW running faults. Low magnetic anomalies (blue color) are found throughout the area, but they extend in three directions: NE-SW, NW-SE, and N-S, which could be related to the sedimentary cover and calc-alkaline rocks. The area is highly deformed and sheared and includes different alteration zone according to our results from the aeromagnetic data and [28]. Area one is shown on the RTP map, representing the first alteration zone where it is located in the northeast and extends in the NE-SW direction parallel to the Gulf of Suez trend. Area two is the second alteration zone, extending in the E-W. Related to the strike-slip faults and transgressed thrust faults, this trend represents the Mediterranean trend and the major ductile shear zones that occur in the central part, coinciding with the Arabian Nubian shield collision with the Nile Craton in the west [29,30]. Our geophysical approach has also identified a third alteration zone, located in the western half of the study region next to the Barramiya mine and stretching in a northwest-southeast direction parallel to the Red Sea trend. The RTP magnetic data's radially averaged power spectrum is split into three parts, as shown in Figure 4: regional (deep) sources, residual (shallow) sources, and Nyquist. Figure 3: RTP magnetic map of the research area. The residual RTP magnetic-component map (Figure 5A) is the most effective in detecting shallow-seated geological structures. A cut-off wavelength of 0.0002 cycle/unit was applied to the RTP map, and the results show that the predominant structures are in the NNE-SSW and NW-SE directions, which are attributed to the area's near-surface structures. In the study area, the magnetic field intensity varies from the highest (319 nT) to the lowest values (\(-\)389 nT). The region contains a variety of local anomalies defined by relatively high frequencies and short wavelengths of various forms (elongated and circular). According to the geological map of the research region, positive anomalies extend in the NE-SW and N-S directions that are associated with the strike-slip faults and transgressed thrust faults. The negative anomalies are distributed in the central part of the study area and extend in the NE-SW and N-S direction due to the presence of sedimentary rocks and calc-alkaline rocks. The regional (low-pass) magnetic map (Figure 5B) depicts deep-seated magnetic anomalies. The RTP map was subjected to a wavelength cutoff of 0.0002 cycle/unit, and regional anomalies were shown by lowering the amplitude and frequency. The RTP map can be used to locate deep-seated structures. However, with lowering the amplitudes and frequencies, several useless anomalies from the RTP map may appear in the low pass map. The deep-seated structural trends affecting the area are in the NW-SE, NE-SW, and N-S directions.