伽马能谱、土壤氡与分量化探联合探测方法在粤北百顺地区铀矿勘查中的应用

Application of Gamma Spectrum,Soil Radon and Partial Extracting Geochemical Prospecting Method in the Uranium Exploration of Baishun Area,Northern Guangdong Province,China

随着粤北百顺地区361铀矿床资源的枯竭,迫切需要在其外围寻找后备资源,实现铀矿山的持续发展。436矿点位于361铀矿床东侧,铀成矿地质条件与361铀矿床极为相似,是区内最具潜力的铀矿找矿地段。为了快速完成436矿点及外围区域铀成矿有利部位的预测,在牛澜断裂与大人山断裂交汇及夹持区,使用地面伽马能谱、土壤氡气和分量化探三种物化探方法联合测量圈定了铀异常区,并进行了综合分析和预测。结果表明,伽马能谱铀异常、土壤氡异常及分量铀异常套合较好,集中分布于436矿点以北F4断裂与大人山断裂夹持区,显示该地段是区内最具潜力的铀成矿有利地段。经钻探工程揭露验证,铀矿化主要赋存于近南北向的F4断裂带内,呈隐伏状态,预示F4等近南北向构造是区内铀矿找矿工作的重点,为该地段下一步的铀矿勘查工作指明方向。

Due to the resources depletion of No.361 uranium deposit, It becomes very urgent to find new reserves in the periphery for the sustainable development of uranium mines in Northern Guangdong. Located to the east of uranium deposit No.361, occurrence No.436 is very similar in the geological conditions to deposit No. 361, and is regarded as the most potential uranium prospecting section in Baishun area. In order to quickly complete the screening of favorable target for uranium exploration, the author adopted the comprehensive geophysical and geochemical prospecting methods of ground gamma ray spectrometric, soil radon gas, and partial element extraction to predict the best favorable location of uranium mineralization and identify the main ore-bearing faults. The survey results showed that uranium anomalies of ground gamma ray spectrometric, soil radon concentration, partial element extraction are well superposed which is concentrated in the clamping area of F4 fault and Darenshan Fault to the north of 436 ore occurrence,indicating that this section is favorable for uranium mineralization. The favorable section was verified by later drilling project and good uranium mineralization was found nearly north to south distributed along the concealed F4 fault, indicating that F4 and other near north to south strike faults are the key uranium prospecting in the area.