APPLICATION OF UPWARD CONTINUATION AND EULER DECONVOLUTION ON AEROMAGNETIC DATA TO DELINEATE THE REGIONAL STRUCTURAL FRAMEWORK OF GABAL EL MOGARID AREA, SOUTH EASTERN DESERT, EGYPT. | ||||
| Journal of Egyptian Geophysical Society | ||||
| Volume 8, Issue 1, 2010, Page 1-11 PDF (1.07 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jegs.2010.380898 | ||||
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| Author | ||||
| R.M. Abdelrahiem | ||||
| Nuclear Materials Authority, P.O. Box 530, El-Maadi, Cairo, Egypt. | ||||
| Abstract | ||||
| Gabal El Mogarid area is located in the south Eastern Desert of Egypt, between latitudes 23° 30' &23° 45' N and longitudes 33° 12' & 33° 30'. It covers a total surface area of about 840 Km2. The area is mainly covered by Precambrian igneous and metamorphic rocks overlain by Cretaceous Nubian Sandstone, Tertiary sediments and Quaternary wadi deposits. This area shows some radioactive anomalies related to the granitic rocks and is structurally controlled by the dominated fault system, which trending in the NNW, NW and NE directions. Two main average magnetic interfaces at depths 0.8 and 1.6 km below the measuring level were calculated through the application of the two-dimensional local power spectrum technique of the RTP magnetic map. Filtering of the aeromagnetic data at the two interfaces was conducted to assist the discrimination between the shallow source (near-surface or residual) and deep source (deep-seated or regional) magnetic anomalies. Upward continuation was carried out at four different levels (1.0, 1.5, 2.0 and 2.5 km) to follow the variations of the magnetic characters of anomalies, when passing from shallow to deep levels. On the other hand, the structural delineations that come from the application of extended Euler deconvolution technique as magnetic contacts or sills and dykes revealed in the area at specified depths. The information obtained from the interpretative techniques (regional, residual, upward continuation and Euler deconvolution) were applied and integrated to construct a basement tectonic map. The interperated structural maps show a gradual increase in the density and crowdness of the interpreted magnetic structural lineaments upwardly from the deep-seated interface the near-surface interfaces. The structural elements affecting to basement complex at the two assigned interfaces with faults (subsided and uplifted blocks) are delineated. This study revealed the existence of several sets of faults the regional (deep-seated) faults are expressed mainly by N-S, E-W and NE trending faults. Meanwhile, the residual (near-surface) lineaments are characterized by a mosaic pattern and shows different sets of faults mainly trending in the NNW, N-S, NW and NE directions. | ||||
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