GROUND MAGNETIC AND GAMMA-RAY SPECTROMETRIC STUDIES OF EAST WADI NASSEIB AREA, SOUTHWESTERN SINAI, EGYPT

East Wadi Nasseib area is located in the southwestern part of Sinai Peninsula, Egypt. It is occupied
by Paleozoic rocks, which unconformably overlie basement complex rocks. The Paleozoic rocks, in the study area,
consist of five formations, which are from base to top, Sarabeit El Khadim, Abu Hamata, Adediya, Um Bogma, and El
Hashash. Um Bogma and Adediya formations are very promising facies for U, some trace elements and REEs .The
lithology and structure play very important role in the localization and distribution of various mineralizations (Mn, Fe,
Cu, U, Th and REEs). inthe present study, ground spectral gamma-ray and total magnetic field surveys were conducted
to follow and delineate uranium anomalous zones as well as the structural setting, which may control the distribution of
these mineralizations in the study area. The results of spectral gamma-ray survey show that the radio spectrometric
values vary for each of K from 0.1 % to 1.7 % , total count from 0.8 Ur to 239 Ur, eU from 0.9 ppm to 211 ppm, and
eTh from 0.4 ppm to 70 ppm. The highest values are associated with Um Bogma Formation. However, the results of
magnetic survey demonstrate that the high magnetic anomalies are associated with ferruginous sandstones with
magnetic values, which are ranging from 42850 nT to 42900 nT. The ground magnetic data were subjected to classic
and modern techniques of spectral and filtering analyses in order to describe the subsurface geological and structural
features. The estimated average depths to the regional and residual sources reach to24 m and 8 m respectively