Investigation for uranium dispersion adjacent to cretaceous phosphatic outcrops in Al-Nassrieh Basin, southern Palmyrides, Syria

Abstract

A detailed radiometric survey including soil gas radon measurements and field gammaray survey, in accordance with geochemical and geological investigations were carried out in Al-Nassrieh Basin (central Syria), for the purpose of uranium exploration. Thirty-six samples were collected from various lithofacies of the survey area and analyzed by γ-ray spectrometric technique for determining the concentration values of major radioelements. The relationships between the concentrations of equivalent eU, eTh, and their ratios were examined in order to define their trend of variations and evaluate the degree of uranium remobilization and redistribution. Although the initial results indicate that uranium enrichment is mostly restricted to the Upper Cretaceous phosphate rocks, a considerable portion of uranium appeared to be leached out of the primary phosphatic source and dispersed in the adjacent recent sediments. Further, notable increases of radon level associated with relatively high values of uranium concentration and gamma count rates were found to be spatially correlated with the transition zone between the marine Paleogene and continental Neogene formations throughout the study basin. This observation demonstrates the importance of the concerned zone as a suitable geological environment for hosting probable uranium mineralization along a chemically reducing interface where surface water of terrestrial and marine origin mingled at depth and away from surficial conditions.

Keywords

radiometric survey / geochemistry / uranium exploration / Al-Nassrieh Basin / Syria

References

Abu-Deif A., Abouelnaga H. S. O., Hasanain H. I. E. Distribution of Radioelement and Its Relation to Uranium Migration, El-Erediya Exploration Tunnels, Central Eastern Desert, Egypt. Journal of King Abdul Aziz University, Earth Science, 2001, 1: 19-40.

Adams J. A. S., Fryey G. E. Portable Gamma-Ray Spectro for Field Determination of Thorium, Uranium and Potassium, 1964, Chicago: University of Chicago, 577-596.

Al-Hilal M., Aissa M. Characterizing the Natural Radiation Levels throughout the Main Geological Units of Sabkhat al Jabboul Area, Northern Syria. Journal of Environmental Radioactivity, 2015, 140: 1-10.

Al-Hilal M., Al-Ali A. The Role of Soil Gas Radon Survey in Exploring Unknown Subsurface Faults at Afamia B Dam, Syria. Radiation Measurements, 2010, 45: 219-224.

Al-Hilal M., Sbeinati R., Darawcheh R. Radon Variations and Microearthquakes in Western Syria. Applied Radiation and Isotopes, 1998, 49(1–2): 117-123.

Asfahani J., Al-Hent R., Aissa M. Geological and Hydrogeological Conditions for Forming Uranium Occurrences in the Froqlos-Jabal Abou Rabah Region, Palmyrides, Syria. Exploration and Mining Geology, 2010, 19(1–2): 1-12.

Baubron J. C., Rigo A., Toutain J. P. Soil Gas Profiles as a Tool to Characterize Active Tectonic Areas: The Jaut Pass Example (Pyrenees, France). Earth Planet. Sci. Lett., 2002, 196: 69-81.

Chiozzi P., Pasquale V., Verdoya M. Naturally Occurring Radioactivity at the Alps–Apennines Transition. Radiation Measurements, 2002, 35: 147-154.

Dickinson K. A., Leventhal J. S. The Geology, Carbonaceous Materials and Origin of the Epigenetic Uranium Deposits in Tertiary Sespe Formation in Ventura County, California, 1988, 1771.

Dyck W. Geochemistry Applied to Uranium Exploration. Uranium Exploration, 1975, 33-47.

Fouad, K. M., Rabie, S. I., Khalil, A. F., 1998). Recognition of the Degree of Remobilization of Uranium from Airborne Gamma-Ray Spectrometric Survey Data: Proceeding of the Fourth Arab Conference on the Peaceful Uses of Atomic Energy, Volume III (Scientific Presentations B), 14–18 /11/1998, Tunis. 45–68

Ghosh D., Deb A., Sengupta R. Anomalous Radon Emission as Precursor of Earthquake. Journal of Applied Geophysics, 2009, 69: 67-81.

Gingrich J. E. Radon as Geochemical Exploration Tool. Journal of Geochemical Exploration, 1984, 21: 19-39.

Hauksson E. Radon Content of Groundwater as an Earthquake Precursor: Evaluation of Worldwide Data and Physical Basis. Journal of Geophysical Research, 1981, 86: 9397-9410.

International Atomic Energy Agency IAEA Radiometric Reporting Methods and Calibration in Uranium Exploration. Technical Report Series, 1976, 147 57.

Ioannides K., Papachristodoulou K., Stamoulis K., . Soil Gas Radon: A Tool for Exploring Active Fault Zones. Applied Radiation and Isotopes, 2003, 59: 205-213.

Jubeli Y., Al-Hilal M., Rajja G., . Radiometric Profiles of Uranium Dispersal Pattern Adjacent to Cretaceous Phosphatic Sediments in Wadi Qasser Al-Hallabat Basin, Central Syria. Exploration and Mining Geology, 2000, 7(4): 313-319.

Jubeli Y. The Role of Airborne Radiometric Survey in Defining the Distribution of Phosphate Rocks in Syrian Desert and the Northern Palmyrides. Exploration and Mining Geology, 1997, 6: 269-278.

Jubeli Y. Final Report on Uranium Exploration in Syria (SYR/86/005), Internal Report, 1990, Damascus: The Atomic Energy Commission of Syria (AECS), 91.

Khattak N. U., Asif K. M., Ali N., . Radon Monitoring for Geological Exploration: A Review. Journal of Himalayan Earth Sciences, 2011, 44(2): 91-102.

King C. Y., King B. S., Evans W. C., . Spatial Radon Anomalies on Active Faults in California. Applied Geochemistry, 1996, 11(4): 497-510.

Ponikarov V. P. The Geological Map of Syria, Scale 1: 200 000, Sheets I-36-XII, I-37-VII and I-37-XIV, V.O, 1963.

Qureshi A. A., Khan H. A., Jafri E. H., . Radon Signals for Geological Explorations. Nuclear Tracks and Radiation Measurements, 1991, 19: 383-384.

Tilsley J. E. Roberts S. Genetic Concentrations Relating to Some Uranium Ore Deposits. Ore Deposit Models, 1988, 194.