The distribution of radioelements in El Gluf biotite granite, north Eastern Desert, Egypt: a guide to the recognition of anomalously radioactive zones

A.A. Ammar, E.M. Elkattan, M.A. Elsadek
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引用次数: 1

Abstract

El-Gluf area is located in the north Eastern Desert of Egypt. It is underlain mainly by Precambrian basement rocks and Phanerozoic sediments. It has been systematically surveyed using high-sensitivity airborne gamma-ray spectrometric and magnetic methods. To identify and outline significant radiometric zones of anomalously high uranium and thorium concentrations in El Gluf biotite granite. These zones could be favourable for potential economic radioactive and/or metallic mineralization. This study could serve as a model for investigating the relationship between the geological structure and radioactive mineralization.

Statistical analysis of the gamma-ray spectrometric data were carried out to delineate anomalies. A two-dimensional trend analysis of faults as tracedfrom the geological map, the radiometric gradients, magnetic lineations and the courses of wadis (valleys) were carried out to delineate major and minor trends in the area.

Seven spectrometric anomalies (two pure uranium, two pure thorium, and three mixed) could be related to the prevailing faulting directions: N-S, N-W and NE. The NW and NE fault trends proved to have a significant impact on the localization of radiometric anomalies, which may point to potential and structurally controlled uranium and thorium mineralizations whose structures are considered to have acted as channel ways for the mineralized solutions.

埃及东北沙漠El Gluf黑云母花岗岩中放射性元素的分布:异常放射性带识别指南
El-Gluf地区位于埃及沙漠的东北部。下垫层主要为前寒武纪基底岩和显生宙沉积物。采用高灵敏度的机载伽玛射线能谱法和磁法对其进行了系统的测量。识别并勾勒出El Gluf黑云母花岗岩中异常高铀和钍浓度的显著辐射带。这些带可能有利于潜在的经济放射性和/或金属矿化。该研究可作为研究地质构造与放射性矿化关系的一个模型。对伽马射线光谱数据进行统计分析,以描绘异常。利用地质图、辐射梯度、磁力线和河(谷)沟的走向对断层进行了二维趋势分析,圈定了该区的主要和次要趋势。7个光谱异常(2个纯铀异常、2个纯钍异常和3个混合异常)可能与主要断裂方向(N-S、N-W和NE)有关。北西向和北东向断裂趋势对放射性异常的定位有重要影响,这可能指向潜在的和结构控制的铀和钍矿化,其结构被认为是矿化溶液的通道。
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