QUALITATIVE INTERPRETATION OF THE AIRBORNE RADIOMETRIC DATA OF ALMAANIYA QUADRANGLE USING GIS TECHNIQUES

Abstract

The total count radiometric data of Ansab and AR-Rukhaimya Quadrangles (the map area) was analyzed and separated to its residual and regional (background) maps. The regional maps showed an increase in radiometric background from northeast towards the southwest, while the residual radiometric anomaly map showed two residual radiometric anomalies distributed in the map area. Anomaly R1, which is located in the western part of the map area, this anomaly coincides mainly with Umm-Er Radhuma,Zahra, Dammam Formation, depression fill sediments and valley fill sediments. The source of potassium in this anomaly maybe related to the valley fill sediment and residual sediments, this anomaly related to the radioactivity of uranium element. Anomaly R2 is located in the midst and easternpart of the map area.This anomaly coincides mostly withUmm-Er Radhuma,Zahra, Dammam Formation, with depression fill sediments and valley fill sediment, this anomaly is related mostly to the radioactivity of potassium and uranium 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 is characterized by existence of numerous surface and subsurface structures might play an important role in forming the radiometric anomalies of the map area. .