氡气测量在云南木利锑矿三号背斜寻找隐伏断裂中的应用

Application of Radon Measurement to Prospecting for Buried Faults in No. 3 Anticline of Muli Antimony Deposit in Yunnan,Southwest China

云南木利锑矿区矿体与断裂关系密切,为解决矿区深边部找矿问题,采用FD-3017RaA测氡仪,对该区三号背斜进行土壤氡气测量,以寻找隐伏断裂。结果显示,研究区各已知断层和矿体上部均出现明显的氡气异常;因此,可将氡气测量作为寻找隐伏断裂的有效手段,并可作为寻找与断裂构造(包括断层、节理、劈理等)关系密切的隐伏矿床的辅助方法。依据测量结果推测,在三号背斜核部和研究区北东部各存在一条大型隐伏断裂,并发现若干条已知断裂及推测隐伏断裂的次级断裂。最后总结出研究区氡气异常的形成模式。

The Muli antimony ore bodies in Yunnan have close relationship with the faults. To solve the deep and edge prospecting problem of the deposit,the FD-3017 RaA radon measuring instrument was used to detect the buried faults in No. 3 anticline of Muli antimony ore bodies. The data indicate that all of the known faults （including faults of Xiaopunong,F1,F2 and F3） and ore bodies show clear radon anomaly. It is suggested that the radon measurement may be an effective method to search for buried faults and an auxiliary method to search for buried deposits which have close relationship with the fracture structure including faults,joints and cleavages. The results reveal that there are two large buried faults in the core of the anticline and the northeastern study area,respectively,and there are many secondary faults of the known faults and the predicted faults. In the end,the radon anomaly model of the study area is summarized.