Paleozoic rocks in the Wadi El Sahu area are affected by many major faults in different directions. A reverse fault trending NE-SW is exposed for about 300 m of its length as it cuts through the Abu Hamata and Adedia formations on the south side of Wadi El Sahu. A secondary ascending hydrothermal solution carrying heavy metals and radioactive minerals passed through the fault plain and the surrounding fractures, forming mineralized and radioactive zone. The mineralized zone thickness ranges from 60 cm to 200 cm along the fault plain. These rocks were analyzed radiometrically using a portable gamma-ray spectrometer, chemically by employing ICP-ES and ICP-MS, as well as mineralogically by both binocular and Environmental Scanning Electron microscope. Gold content was also determined by fire assay. REE and U contents reached up to 2682 and 1216 ppm, respectively. Mineralogical investigations indicated the presence of uraninite, torbernite, autunite, sklodowskite, kasolite as uranium minerals, thorite as a thorium mineral, monazite, allanite and xenotime as REE-bearing minerals, zircon and columbite as accessory minerals, gold and nickel as precious and base metals, in addition to cassiterite, chalcopyrite, chalcocite and chrysocolla. High REE and U contents are attributed to the circulation of epigenetic U and REE-bearing hydrothermal solutions along the fault plain and its surrounding fractures. Hydrothermal alteration processes could then be confirmed by the presence of the M-type tetrad effect in the REE-patterns of the ferruginous sandstone. The non-chondritic ratio of Nb/Ta, Zr/Hf and Y/Ho in the studied sandstone may be attributed to the tetrad effect. The Ce and Eu anomaly with unusual REE-patterns was represented by the presence of conjugated M-W tetrad effects, indicating either the dual effect of hydrothermal solutions or groundwater with seawater. The results clarify that the tetrad-effects could be used as evidence for the environment of deposition and as an indication for gold mineralization.

中文翻译：

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埃及西奈西南 Wadi El Sahu 地区断层带含铀砂岩的矿物学和地球化学：对物源、风化和构造环境的影响

Wadi El Sahu 地区的古生界岩石受不同方向的许多主要断层的影响。当它穿过 Wadi El Sahu 南侧的 Abu Hamata 和 Adedia 地层时，一条向 NE-SW 走向的反向断层暴露了大约 300 m 的长度。携带重金属和放射性矿物的二次上升热液穿过断层平原及周围裂缝，形成矿化和放射性带。沿断层平原的矿化带厚度为 60 至 200 厘米。使用便携式伽马射线光谱仪对这些岩石进行辐射分析，使用 ICP-ES 和 ICP-MS 进行化学分析，以及通过双目和环境扫描电子显微镜进行矿物学分析。金含量也通过火法测定。REE 和 U 含量达到 2682 和 1216 ppm，分别。矿物学调查表明，铀矿物为铀矿、钙钛矿、赤铁矿、sklodowskite、kasolite、钍矿、钍矿、独居石、allanite和磷钇矿为含稀土矿物，锆石和铌铁矿为副矿物，金和镍为贵重和基础金属，除了锡石、黄铜矿、辉铜矿和金钴矿。高稀土元素和铀含量归因于后生铀和稀土元素热液沿断层平原及其周围裂缝的循环。然后可以通过铁质砂岩的 REE 模式中 M 型四分体效应的存在来确认热液蚀变过程。所研究砂岩中 Nb/Ta、Zr/Hf 和 Y/Ho 的非球粒陨石比例可能归因于四分体效应。具有不寻常 REE 模式的 Ce 和 Eu 异常表现为共轭 MW 四分体效应的存在，表明热液溶液或地下水与海水的双重效应。结果表明，四分体效应可用作沉积环境的证据和金矿化的指示。