The current work is an attempt to reveal the possible utilization of the radiometric measurements to build-up a complete genetic scenario for magmatic, hydrothermal, and supergene uranium mineralization. For this purpose, ground gamma-ray survey was performed through the exploratory tunnels dug perpendicular to El-Missikat and El-Erediya shear zones, the Central Eastern Desert of Egypt. Contents of U, Th, and K were measured for the host pink granite (e.g., avg.15.94 U ppm, 35.62 Th ppm, and 6.63% K), alteration zones (brecciation, silicification, greisenization, kaolinization and hematitization) (e.g., avg. 124.01 U ppm, 63.67 Th ppm, and 3.13% K), and mineralized silica veins (e.g., avg. 312.65 U ppm, 92.22 Th ppm, and 2.62% K). All of these data were graphically represented as correlation plots of Th vs. U, Th/U vs. U, Th vs. K, and U/K vs. Th/K. The overall results indicate magmatic, hydrothermal, and supergene sources of El-Missikat and El-Erediya U mineralization. The magma-derived U contents are enclosed mainly in the pink granite that is mostly characterized by normal Th/U (2.5–5) and Th/K ratios (3–5*10–4). The hydrothermal processes through the alteration zones and mineralized silica veins are reflected by the weak correlation of Th with U (e.g. r = 0.13 and − 0.39), the strong negative correlation of Th/U ratio with U (e.g. r = − 0.82), 2.5˃Th/U˃0.1, Th/K˃5*10–4, Th/K < 3*10–4, and the strong positive correlation of U/K with Th/K (e.g. r = 0.91) as well as the occurrence of thorite, columbite, xenotime and hydrothermal zircon (0.5 > Th/U ≤ 0.1). Afterwards, the hydrothermal mineralization underwent some degrees of chemical weathering that resulted in supergene U mineralization whose fingerprints can be traced by the occurrence of secondary U minerals (e.g. kasolite and uranophane), Th/U ratios ≤ 0.1, and the weak correlation between Th/K and U/K (e.g. r = 0.39 and − 0.11).

中文翻译：

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Th/U、Th/K 和 U/K 比率对 U 矿化的遗传影响：埃及东部沙漠 El-Missikat 和 El-Erediya 剪切带的案例研究

目前的工作试图揭示辐射测量的可能用途，以建立岩浆、热液和表生铀矿化的完整成因情景。为此，通过垂直于埃及中东部沙漠 El-Missikat 和 El-Erediya 剪切带挖掘的勘探隧道进行了地面伽马射线勘测。测量了主体粉红色花岗岩的 U、Th 和 K 含量（例如，平均 15.94 U ppm、35.62 Th ppm 和 6.63% K）、蚀变带（角砾化、硅化、灰岩化、高岭土化和赤铁矿化）（例如，平均 124.01 U ppm、63.67 Th ppm 和 3.13% K），以及矿化硅脉（例如，平均 312.65 U ppm、92.22 Th ppm 和 2.62% K）。所有这些数据均以 Th 与 U、Th/U 与 U、Th 与 K 以及 U/K 与 Th/K 的相关图形式表示。总体结果表明 El-Missikat 和 El-Erediya U 矿化的岩浆源、热液源和表生源。岩浆衍生的U含量主要封闭在粉红色花岗岩中，其主要特征是正常的Th/U（2.5-5）和Th/K比（3-5*10-4）。通过蚀变带和矿化硅脉的热液过程反映为Th与U的弱相关性（例如r = 0.13和- 0.39），Th/U比值与U的强负相关性（例如r = - 0.82）， 2.5˃Th/U˃0.1、Th/K˃5*10–4、Th/K < 3*10–4，以及U/K与Th/K强正相关（例如r = 0.91）以及钍铁矿、铌铁矿、磷钇矿和热液锆石的赋存（0.5 > Th/U ≤ 0.1）。此后，热液矿化经历了一定程度的化学风化，形成了表生U矿化，其指纹可以通过次生U矿物（如高硅石和铀辉石）的出现来追踪，Th/U比值≤0.1，Th/U之间的相关性较弱。 K 和 U/K（例如 r = 0.39 和 − 0.11）。