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This paper is concerned with the geology and radioactivity of alkaline granites southwest Gabal Nusab El Balgoum area, South Western Desert, Egypt. The alkaline granites are equigranular in texture, fineto medium-grained and dominated mainly by perthitic orthoclase and quartz, aegirine-augite, aegirine, and plagioclase, while Bastnaesite, xenotime, calcite, monazite, zircon and apatite are accessory minerals. Opaques represented by Hematite, ilmenite, goethite and little sulphides (chalcopyrite and pyrrhotite). Applying alpha-track emission technique indicates that iron oxides and altered feldspar minerals contain great amount of radio-elements (U and Th). Representing field radiometric contour maps for eU, eTh (ppm) and K% indicate that U and Th concentrate in the main fault trend NE-SW, which suggest that the enrichment of U is structurally controlled. A difference between field measurements (eU and eTh) with the chemical analysis data (U and Th) can be explained due to recent U addition. The trace elements contents show that Zr, Nb, Y (HFS elements) values increase with increasing U due to hydrothermal alteration at later stages of magmatic activity. Chondrite normalized REE diagram shows that the alkaline granite has enrichment of ∑ REE and display progressive enrichment in LREE relative to HREE which shows a slightly flat pattern with large negative Eu anomaly. The enrichment of REEs may be attributed to the presence of bastnaesite and monazite as a source of LREE and xenotime as a source for HREE.

GEOLOGY AND RADIOACTIVITY OF ALKALINE GRANITES OF SOUTHWEST GABAL NUSAB EL BALGOUM AREA, SOUTH WESTERN DESERT, EGYPT