STATISTICAL ANALYSIS OF AIRBORNE GAMMA RAY SPECTROMETRIC DATA OF G. UMM NAGGAT AREA, CENTRAL EASTERN DESERT, EGYPT

The analysis of airborne gamma ray spectrometric measurement for G. Umm Naggat area, Central Eastern Desert, Egypt, has shown that statistical treatment of these data with respect to individual geological units is useful in outlining the provinces of uranium enchainment that may be indicated for alteration processes. Three ways were followed to outline and locate the uraniferous provinces. First way is to compare the average of each rock unit with published crustal average value. Second way construct by uranium anomaly map where the position and the quantity of deviations in units equal to the standard deviation from the mean for eU, eU/eTh and eU/K could be outlined. These two ways demonstrate three major groups of high eU values, which coincide with high eU/eTh and eU/K values, related to biotite younger granites of the three pluton, north of Umm Naggat pluton due to albitization process, Umm Bisilla pluton and El Unayji pluton. While the third way is confirmed by examining the profiling across these anomalous zones of (eU, eU/eTh and eU/K) values. Furthermore a close relationship was found between the surface fault traces in the area and the spatial distribution of the identified spectrometric abnormalities. The younger granites plutons for uranium prospecting which are considered the most promising according this analysis