INTERPRETATION OF AEROMAGNETIC DATA, GABAL ABU MARWA AREA NORTH EASTERN DESERT, EGYPT | ||||
| Journal of Egyptian Geophysical Society | ||||
| Volume 7, Issue 1, 2009, Page 83-95 PDF (1.46 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jegs.2009.380883 | ||||
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| Author | ||||
| M.F. MOUSSA | ||||
| Geology Department, Faculty of Science, South Valley University, Egypt. | ||||
| Abstract | ||||
| Aeromagnetic and landsat data were interpreted to infer the most pronounced tectonic trends, both on the surface and at the subsurface and to determine the thickness of the surface geologic rock units as presently mapped, as well as to estimate the depth to the top of source magnetic bodies in Gabal Abu Marwa area, north Eastern Desert of Egypt. Trend analysis was carried out on the structural lineaments that are deduced from magnetic, shaded relief images and geological map of the study area. Both magnetic and landsat image lineaments revealed four major sets of structural lineaments trending in the NE -SW, NW-SE, N-S and E –W directions. The traced drainage lineaments show major sets trending in the NE- SW direction meanwhile; N-S and E-W directions are observed as secondary lineaments. The statistical test analyses revealed diversity in the correlation strength between the various data sets. Two depth estimation techniques (analytic signal and local wavenumber) were applied on the entire grid of the total-intensity magnetic data. The obtained depth results are used to construct depth contour maps to the top of source bodies. These maps reflect the outcropping or near-surface causative bodies at the central western part of the study area. Meanwhile, a remarkable increase in the depth values toward the central part of the area forming a basin of a NW-SE direction parallel to the Red Sea. This means that the magnetic anomalies are due to relatively deep causative bodies. Forty two magnetic profiles were selected in the modeling process to determine the parameters (susceptibility, depth and width) values of the rock units. These models manifest the subsurface distributions of the rock units and their relation to the surface geology. The surface rock units have susceptibility values ranging from 0.000001 cgs to 0.0072 cgs unit and width values ranging from 100 to 7000 m. However, they have limited depth extension and the depth to the magnetic source bodies starting from the surface to a depth of about 1400 m | ||||
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