氡气及CSAMT联合探测在内蒙古五十家子盆地铀矿勘查中的应用研究

Application study of radon gas and CSAMT joint detection in the uranium exploration in the Wushijiazi Basin of Inner Mongolia

五十家子火山盆地铀成矿地质条件优越,地表已发现大量蚀变裂隙带型铀矿化及异常点,为查明控矿断裂沿走向、倾向延伸变化情况及深部铀矿体有利富集部位,便于开展深部勘查工作。因此在研究区铀矿化密集部位开展了氡气及可控源大地电磁测深联合探测工作方法,大致查明了研究区主控矿断裂构造特征,并预测6处铀成矿有利部位,其中2处铀成矿有利部位经钻探查证,发现较好的工业铀矿体。表明氡气与可控源大地电磁测深联合探测寻找隐伏断裂和盲矿体效果显著,适用于控矿因素以断裂构造为主的铀矿勘查找矿工作,为今后铀矿找矿工作提供思路及方向,以期扩大铀矿找矿成果。

The uranium mineralization in the Wushijiazi volcanic basin enjoys a superior geological conditions.The uranium mineralization anomalies have been found on the surface,and they are of altered and fractured zone type.To identify the extension changes of ore-controlling fracture along the strike and dip as well as the favorable enrichment of uranium orebody,the authors carried out deep exploration.The joint detection of radon gas and CSAMT(Controlled Source Audiofrequency Magnetotelluric)was adopted in the study area where uranium mineralization is densely concentrated.The major structure and characteristics of ore-controlling fracture were identified,and six uranium mineralization favorable places were predicted,among which two places were drilled to verify,and industrial uranium orebodies were found in these two places.It is shown that the joint detection of radon gas and CSAMT is significantly effective in the search for concealed faults and fractures and blind orebodies;it can be adopted in the prospecting work of the uranium deposit with a major ore-controlling factor of fault structure,and can provide the future uranium deposit prospecting work with some ideas and directions,so as to accelerate uranium deposit prospecting work.