Gamma-Ray Spectrometry and Induced Polarization Studies for El Atshan-II Uranium Prospect Area, Central Eastern Desert, Egypt


Gamma-ray spectrometry and induced polarization (IP) studies were carried out to determine the radioactive anomalous zones and to follow their lateral and vertical extensions in El Atshan-II uranium prospect area, central Eastern Desert, Egypt. This area and its surroundings are covered by different Precambrian basement rocks, which intruded by younger bostonite rock, andesite dykes and carbonate veins. Data of the gamma-ray spectrometry have been analyzed qualitatively and quantitatively by applying specific interpretation techniques. These data revealed a wide radioactivity range oscillating from 15.0 to 2362.0 Ur, 0.5 to 307.2 ppm, 0.1 to 55.1 ppm and 0.3 to 22.0% for the total count (Tc), equivalent uranium (eU), equivalent thorium (eTh) and potassium (K), respectively. The constructed radioelement concentration maps and eU-composite image of the study area showed that the anomalously high radioactivity levels are mainly associated with outcrops of the bostonite rock. The induced polarization data were mathematically inverted to produce the true resistivity and chargeability values of cross-sections below the surveyed lines traverse in the area. The resistivity values are varied both vertically and horizontally from 7.83 to more than 1042.0 ohm·m, while the chargeability values are ranged from 0.195 to more than 204.0 mV/V, suggesting variation of the rocks facies and mineralizations. Integration of the resistivity and chargeability data indicates the presence of some mineralized zones, mainly associated with the bostonite rock, with depths varied from the near-surface to more than 70 m. Therefore, a core drilling is recommended at some stations along three selected profiles to a depth of 70 - 100 m to test the depth, structural model and grade of mineralization in the area.

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S. M. Assran, A. , A. M. Elsayed, R. , H. Ghazala, H. and F. Abdelsalam, H. (2014) Gamma-Ray Spectrometry and Induced Polarization Studies for El Atshan-II Uranium Prospect Area, Central Eastern Desert, Egypt. Geomaterials, 4, 92-104. doi: 10.4236/gm.2014.43010.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] Moxham, R.M. (1963) Natural Radioactivity in Washington Country, Maryland. Geophysics, 28, 262-272.
[2] Durrance, E.M. (1986) Radioactivity in Geology. Principles and Applications. Ellis Horwood Series in Geology, 441 p.
[3] International Atomic Energy Agency (IAEA) (2003) Guidelines for Radioelement Mapping Using Gamma ray Spectrometry Data. IAEA-TECDOC-1363, Vienna, 179 p.
[4] El Manharawy, M.S. (1972) Isotopic Ages and Origin of Some Uranium Bearing Volcanic Rocks in Egypt. M.Sc. Thesis, Cairo University, Egypt, 147 p.
[5] Mahdy, M.A., Salman, A.B. and Assaf, H.S. (1994) Bostonite Rocks as Additional Uranium Resources in Egypt. Second International Conference of the Geology of the Arab World, Cairo University, Egypt, 77-96.
[6] Abdel Gawad, A.M. (1964) Mineralogy, Geochemistry and Radioactivity of El Atshan Uranium Deposit, Eastern Desert, U.A.R. Internal Report, U.A.R. Atomic Energy Establishment, Cairo.
[7] Assaf, H.S. (1966) Ground Exploration and Geological Studies on Some Radioactive Occurrence in the Area South Qusseir. M.Sc. Thesis, Faculty of Science, Ain Shams University, Cairo, 85 p.
[8] El Kassas, I.A. (1969) Comparative Geological Investigations of the Radioactive Mineralization in the Central Eastern Desert, Egypt. M.Sc. Thesis, Faculty of Science, Ain Shams University, Cairo, 132 p.
[9] Bakhit, F.S. (1972) Geological Studies and Radiometric Investigation at Um Huyut-Kab El Abiad Area, Eastern Desert, Egypt. M.Sc. Thesis, Faculty of Science, Ain Shams University, Cairo, 132 p.
[10] Hussein, A.H. and El Kassas, I.A. (1972) Occurrences of Some Primary Uranium Mineralization at El Atshan Locality, Central Eastern Desert. Journal of Geology of the United Arab Republic, 14, 97-111.
[11] Hussein H.A. and Bakhit, F.S. (1988) Uranium-Bearing Alkaline Volcanics of North Wadi Kariem and Surroundings, Central Eastern Desert, Egypt. Mining Geology, 38, 39-48.
[12] Geosoft Inc. (2010) Geosoft Mapping and Processing System. Geosoft Inc., Toronto.
[13] Sharma, P.V. (1997) Environmental and Engineering Geophysics. Cambridge University Press, Cambridge, 1-475.
[14] Telford, W.M., Geldart, L.P. and Sheriff, R.E. (1990) Applied Geophysics. 2nd Edition, Cambridge University Press, Cambridge, 770 p.
[15] Darnley, A.G. (1973) Airborne Gamma-Ray Techniques—Present and Future; Uranium Exploration Methods. International Atomic Energy Agency, Proceedings of a Panel, Vienna, 67-108.
[16] Boyle, R.W. (1982) Geochemical Prospecting for Thorium and Uranium Deposits. Elsevier, Amsterdam & New York, 498 p.
[17] Duval, J.S. (1983) Composite Color Images of Aerial Gamma-Ray Spectrometric Data. Geophysics, 48, 722-735.
[18] Darnely, A.G. and Ford, K.L. (1989) Regional Airborne Gamma-Ray Surveys, a Review. In: Garland, G.D., Ed., Proceedings of Exploration ‘87, 3rd Decennial International Conference on Geophysical and Geochemical Exploration for Minerals and Groundwater, Ontario Ministry of Northern Development and Mines, Ontario, 229-240.
[19] Sarma, D.D. and Koch, G.S. (1980) A Statistical Analysis of Exploration Geochemical Data for Uranium. Mathematical Geology, 12, 99-114.
[20] Adams, J.A.S., Osmand, J.K. and Rogers, J.J.W. (1956) The Geochemistry of Thorium and Uranium. In: Physics and Chemistry of the Earth, Pergamon Press, New York, 298-348.
[21] Clark, S.P., Peterman, Z.E. and Heier, K.S. (1966) Abundances of Uranium, Thorium and Potassium. Handbook of Physical Constant. Geological Society of America Memoirs, 97, 521-542.
[22] Rogers, J.J.W., Ghuma, M.A., Nagy, R.M., Greenberg, J.K. and Fullagar, P.D. (1978) Plutonism in Pan-African Belts and Geologic Evolution of Northeastern Africa. Earth and Planetary Science Letters, 39, 109-117.
[23] Saunders, D.F. and Potts, M.J. (1976) Interpretation and Application of High Sensitivity Airborne Gamma Ray Spectrometric Data. In: Exploration for Uranium Ore Deposits. Proceedings Series, International Atomic Energy Agency, Vienna, 1976, 107-124.
[24] LoKe, M.H. (2003) RES2DINV-Rapid 2D Resistivity and IP Inversion Using the Least-Squares Method. Geotomo Software Manual, Malaysia.
[25] Allis, R. (1990) Geophysical Anomalies over Epithermal Systems. Journal of Geochemical Exploration, 36, 339-374.
[26] Irvine, R.J. and Smith, M.J. (1990) Geophysical Exploration for Epithermal Gold Deposits. Journal of Geochemical Exploration, 36, 375-412.
[27] White, R.M.S., Collins, S., Denne, R., Hee, R. and Brown, P. (2001) A New Survey Design for 3D IP Inversion Modeling at Copper Hill. Exploration Geophysics, 32, 152-155.

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