活性炭吸附测氡在钠交代热液型铀矿勘查中的应用——以龙首山成矿带芨岭地区为例

Application of Activated Carbon in Measuring Radon for the Exploration of Sodium Metasomatic Hydrothermal Uranium Deposits:A Case Study of Jiling Area in Longshoushan Metallogenic Belt

龙首山成矿带芨岭铀矿床是我国北方较为典型的钠交代热液型铀矿床之一。为验证活性炭吸附测氡法在钠交代热液型铀矿勘查中的有效性,在芨岭地区开展了系统的活性炭氡气剖面测量,通过已知矿区与未知矿区剖面分析、对比,对区内控矿断裂构造和铀矿化进行了深入研究。结果表明,氡浓度曲线能够较好地反映控矿断裂构造和铀矿化,异常极值和曲线形态受矿体的埋深、规模和断裂构造产状影响较大。芨岭外围和马路沟地段具备较好的成矿潜力,但铀矿化规模较芨岭矿床有逐渐变小的趋势。活性炭吸附测氡法能有效识别铀矿化信息,在钠交代热液型铀矿勘查中具有较好的指导意义。

The Jiling uranium deposit in Longshoushan metallogenic belt is one of the typical sodium metasomatic hydrothermal uranium deposits in northern China. In order to verify the effectiveness of using activated carbon to test the radon concentration in the exploration of sodium metasomatic hydrothermal uranium deposit, a systematic survey for activated carbon measurement sections of radon was conducted in the Jiling area. Through analysis and comparison between known and unknown sections, the ore-controlling fault structure and uranium mineralization have been deeply studied. The study found that radon concentration curve can well reflect the fault structure and uranium mineralization, but the anomalous extremum and shape of curve are greatly influenced by the burial depth,the scale of ore body and the occurrence of fault structure. These radon survey data show that the outside of the Jiling and Malugou districts have good ore-forming potential, but the scale of uranium mineralization has a tendency of decreasing gradually from Jiling uranium deposit. the method of radon survey by activated carbon can be effectively used to identify uranium mineralization, which has a good guiding significance in the exploration of sodium metasomatic hydrothermal uranium deposits.