QUALITATIVE INTERPERTATION OF THE AIRBORNE RADIOMETRIC DATA OF AL-QAIYARA QUADRANGLE USING GIS TECHNIQUES

Abstract

The total count radiometric data of Al-Qaiyara Quadrangle(the map area) was analyzed and separated to its residual and regional (background) maps. The regional maps showed an increase in radiometric background from southwest towards the northeast, while the residual radiometric anomaly map showed two residual radiometric anomalies distributed in the map area. Anomaly (R1) is located in the west of the map area and mostly reflectsFatha Formation, residual soil, sabkha sediment and valley fill sediment,this anomaly is related to the radioactivity of potassium element. Anomalies (R2) located in the east of the map area and mostly reflect Injana and Fatha formations, Residual soil, valley fill sediment and Sheet Run off sediment.This anomaly is related to the radioactivity of potassium element.A comparison between total count radiometric map and the geological map of the study area was carried out; it showed a radioactive range of each geologic formation and Quaternary sediments. It was concluded that, in general, the structural setting of the map area, which characterized by existence of numerous surface andsubsurface structuresmight play an important role in forming the radiometric anomalies of the map area.