Integration of airborne geophysical and satellite imagery data to delineate the radioactive zones at west Safaga Area, Eastern Desert, Egypt | ||
| NRIAG Journal of Astronomy and Geophysics | ||
| Volume 7, Issue 2, December 2018, Pages 297-308 PDF (9.73 M) | ||
| DOI: 10.1016/j.nrjag.2018.07.005 | ||
| Author | ||
| M.A. Zayed | ||
| Abstract | ||
| The main topic of this study is to use the airborne geophysical data and the satellite images to reveal the structural setting that affect in the distribution of the radioactive minerals in west Safaga Area. The gamma-ray spectrometric maps are useful to delineate the boundaries of the rock units. The radioelement maps of K%, eU and eTh provide, on a single display, an overall picture of the radioelement distributions across the study area. The high radiometric anomalies are concentrated over the granitic rocks and the granite dykes at the southeastern and northwestern parts of the study area. The magnetic data reduced to the north magnetic pole (RTP) was separated to regional and residual magnetic component maps to reveal the major deep structures in the area. The depth estimation of shallow and deep seated interfaces were calculated through the application of power spectral analysis of the aeromagnetic data, two main average interfaces at depths 0.2 and 0.56 Km below the measuring level. From the interpretation of false colored composite images of Landsat-5(TM) and ASTER, (bands 2, 4 & 7 for Landsat-5(TM) and bands 7, 3, 1 for ASTER) in RGB, it is easy to distinguish the boundaries between rock units, according to color differences and photo geological characteristics of the rocks, in addition to the band ratio of, 5/7, 5/1, 5/4 for Landsat TM and the band ratio of 4/7, 4/1, 4/3 for ASTER) in RGB, respectively. Integration of the gamma-ray spectrometric, magnetic maps and the processed satellite images(Landsat-5(TM) and ASTER images), revealed approximately rapprochement between the high radiation zones, brakes between the high and low magnetic amplitude and the surface observed faults and the fractures in the locations between the rock types boundaries in the studied area. | ||
| Keywords | ||
| Radioactive zones; Spectrometric; aeromagnetic; Central Eastern Desert | ||
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