FEATURES CONTROLLING RADIOELEMENTS DISTRIBUTION IN AL AGLAB REGION, NORTH EASTERN DESERT, EGYPT | ||
| Nuclear Sciences Scientific Journal | ||
| Article 10, Volume 3, Issue 1, 2014, Pages 149-168 PDF (8.96 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/nssj.2014.30971 | ||
| Authors | ||
| AHMED A. KHAMIES; REMON R. AYOUB | ||
| Nuclear Materials Authority,Cairo, Egypt | ||
| Abstract | ||
| This work is an approach to integrate multi-discipline set of data including geological and remote sensing as well as airborne, ground radiometry and aeromagnetic geophysical data aiming to establish the controlling features of the radioelement potential distribution within Al Aglab area. The investigated area of Al Aglab region is located within the Northern Eastern Desert litho-structural domain where the outcropping rock types comprise: metavolcanics (oldest), quartz diorites, Dokhan volcanics, Hammamat sediments and gabbrogranophyre associations intruded by monzogranite, syenogranite and post granitic dykes (youngest). The granitic rocks display sharp contact with the older pre-existing rock. The radioactive anomalies lay at the intersections between NNW-SSE to N-S and NE-SW to ENE-WSW trending structure lineaments (joints, faults and shear zones) within the syenogranites pluton of G. Al Aglab and along the NE-SW to ENE-WSW trending felsitic dykes, jasperoid veines and pegmatite bodies. Landsat Thematic Mapper (TM) remote sensing map in great concordance with airborn gamma ray spectrometric data delineate most of the surface geology over the compiled geological map. The extracted structural lineaments are coherent to those inferred from the analytical signal magnetic maps in complete harmony with the NNW-SSE to N-S and NE-SW to ENE-WSW trending fault systems obtained from the ground geological and radiometric investigation. Moreover, different types of alterations such as hematitization, Kaolinitization, chloritization and silicification are recorded within the synogranite, where their distribution is mainly controlled by the intersections between the NNW-SSE to N-S and NE-SW to ENE-WSW trending structural lineaments. The studied structural lineaments are arranged according to three main trend clusters around NNW-SSE to N-S, NE-SW to ENE-WSW and NW-SE to WNW-ESE directions representing the main factor controlling the emplacement of the different granitic intrusions in Al Aglab area. Moreover, most of these lineaments, as obtained from field measurements, show strike-slip movement criteria within an extensional context. All the recorded mineralized occurrences are related to extensional events that create the necessary space either for mineral entrapment and/or the percolation of the hydrothermal carrying solutions along these structural trends especially at their intersections. Spectrometric data (K, U and Th) shows a very high consistency between the radioelement distributions and the differentiated outlines of different rock types. Results from integrated field studies, Landsat Thematic Mapper (TM) remote sensing data and geophysical data analyses provide important constraints on the tectonic evolution of Al Aglab area and importantly, demonstrate the strength of combining remote sensing data with geophysical data and geological observations in resolving the surface geometry of major fault systems and their impact on the radioelement potential distribution within Al Aglab area. | ||
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