Abstract
The study area is located between longitude 33° 18' 00" − 33° 21' 00" E and latitude 28° 59' − 29° 01' N and covers approximately 700 km2. Uranium and thorium isotopes were determined by alpha spectrometry. The activity concentrations of 238U, 234U and 235U were ranged between 245.5 ± 8.3–465.2 ± 15.2 Bq.kg−1 with an average 345.5 ± 10.4–452.5 ± 9.3 Bq.kg−1 and 890.5 ± 21.3 Bq.kg−1 with an average 632.3 ± 14.9–11.40 ± 0.5 Bq.kg−1 and 21.50 ± 1.4 Bq.kg−1, respectively. The activity concentration of 232Th, 230Th and 228Th were ranged between 153.1 ± 0.3–318.1 ± 2.9 Bq.kg−1, 149.5 ± 0.7–280.8 ± 2.2 Bq.kg−1 and 36.9 ± 0.1–60.5 ± 0.9 Bq.kg−1. The 230Th/232Th activity ratios in all samples were lower than 20, indicating that these samples have been contaminated by detrital 230Th. Th/U ratio varied between 1.3 and 2.1 with an average 1.8; all values were lower than 3.5, indicated enrichment of uranium. 234U/238U activity ratios that higher than unity indicates that an isotope of uranium has migrated within the rock. From the isotopes of uranium and thorium and their activity ratios, the isochron age for the collected samples was about 58.96 ka.
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