Gamma-ray spectrometric investigation of north El-Tor area, southwestern Sinai, Egypt | ||
| NRIAG Journal of Astronomy and Geophysics | ||
| Volume 7, Issue 2, December 2018, Pages 390-398 PDF (1.68 M) | ||
| DOI: 10.1016/j.nrjag.2018.03.003 | ||
| Authors | ||
| Ibrahim M. Gaafar; Ahmed Abdrabboh; Abdalla S. Alshami | ||
| Abstract | ||
| Interpretation was executed on the airborne and ground spectrometric data of Abu-Zeneima/Al-Tor area for verifying the significant anomalies as it contains important targets for prospective nuclear materials. Airborne spectrometric survey revealed that younger granites, are characterized by increase in the three main radioactive elements up to 5.4% K, 10ppm eU and 33ppm eTh. The western part of the study area includes sedimentary section which contains uranium-bearing phosphate beds. They are characterized by increase of airborne uranium concentration up to 14.2ppm without potassium or thorium enrichment. The airborne image maps for eU/eTh and eU/K as well as ternary composite map revealed also that there is a promising U-anomaly, associated with the sedimentary section. Detailed ground spectrometric survey for the Cretaceous Nubian sandstone in Wadi Araba indicated that it is characterized by eU content reaches about 34ppm, while eTh attains only about 9.8ppm and potassium is 1.2%. Therefore, the eU/eTh ratio, reaches to a value of 3.4. The same sandstone bed in Abu - Durba Formation possesses eU values reach 67ppm, whereas eTh values attain 38ppm and average of potassium is 0.5%. The eU/eTh ratio is about 2, indicates also enrichment of uranium. The eU reaches a concentration of about 40ppm in limestone of Matulla Formation whereas, the eTh values attains about 3ppm and average K is 0.1%. Therefore, the eU/eTh ratio reached 13, due to the limestone is phosphatic. High eU value reaching to 80ppm is recorded in the limestone facies of Sudr Formation, while the eTh values up to 11ppm and potassium of about 0.9% are recorded. The eU/eTh ratio value reaching 7.3 indicates the high PO content. A high uranium content is recorded at the northeastern part of El-Qaa plain area in the Sudr Formation reaching 47ppm, while low eTh values attaining 7.5ppm and potassium of 0.1% are recorded. | ||
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