QUALITATIVE INTERPRETATION OF THE AIRBORNE RADIOMETRIC DATA OF ANSAB AND AR-RUKHAIMYA QUADRANGLES USING GIS

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 east towards the west, while the residual radiometric anomaly map showed three 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 Formation, depression fill sediments and valley fill sediments. The source of potassium in this anomaly maybe related to the valley fill sediment and depression fill sediments, while, the source of uranium element related to the carbonaceous rock of Umm Er-Radhuma Formation Anomaly R2 figure is located in the midst part of the map area.This anomaly coincides mostly with depression fill sediments, valley fill sediment, polygenetic sediments, Zahra and Dammam Formation. This anomaly is related mostly to the radioactivity of potassium element. Anomaly R3 this anomaly is located in the East part of the map area, this anomaly coincides with Dibdiba Formation, valley fill and depression fills sediment. The source of potassium in this anomaly may be the clastic sediments of Quaternary, (valley fill and depression fill sediment), and Dibdibba Formation. 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. .