Abstract

Qena-Quseir shear zone area is located at the central part of the Eastern Desert covering area of about 9460 Km2. This area is mainly covered by basement rocks however there are parts covered by sedimentary rocks ranging in age from Upper Cretaceous to Quaternary. In this research, airborne gammaray spectrometric data is used to refinement of the mapped surface geology depending on the radioelements content between lithological assemblages. The gamma-ray data is also used for studying the distribution of the radioactive elements and determination of anomalous zones of uranium. The data were collected by Aeroservice department, Western geophysical company of America along flight lines oriented in a NE-SW direction with 1.5 Km line spacing and along tie lines oriented in NW-SE direction with 10 Km line spacing. Radioelements maps shows three levels of concentrations. The high level is related to younger granite, Duwi formation and some parts of Dokhan volcanics whereas the lowest level is related to metavolcanics. Radioelements ratio map shows that the high level is compatible with Duwi formation, Younger granite and some parts of Dokhan volcanics. The radioelement composite image map display that the light zones is correlated with younger granite, Duwi formation and parts of Dokhan volcanics. Normality and Chi-Square (χ2) tests were applied to construct the interpreted radiometric lithologic unit (IRLU) map depending on the total count radiometric survey data. After applying normality and Chi- Square (χ2) tests, it is found that twenty-five rock units have normal distribution and eight rock units don’t have. The rock units which is found to obey non-normal distribution are divided into two subunits. In this study, significant locations of eU anomalies are defined on the basis of calculation of probabilities, where their data differ significantly from the mean background, as defined by the data themselves, and at certain levels of probabilities these differences w