粤北石人嶂钨矿放射性矿化研究

Study on radioactive mineralization of Shirenzhang Tungsten Deposit in Northern Guangdong

粤北石人嶂石英脉型钨矿床的石英脉、花岗岩、云英岩均发育晶质铀矿、含钍晶质铀矿、钍石、方钍石等系列放射性矿物。为了探寻是否存在放射性矿化,笔者通过系统测试发现以下规律：1）矿区含钨石英脉的放射性元素（U、Th）含量相对较低,绝大多数样品比地壳克拉克值还低;2）花岗岩的平均含量均比华南产铀花岗岩高出2-10倍;3）云英岩的U、Th含量更高,而富含硫化物的钨矿脉U、Th含量也很高,并发育放射性矿物;4）自550-340m中段,各类地质体或不同矿脉的放射性元素含量呈现由小→大的变化趋势;5）矿区深部及富含硫化物钨矿脉和云英岩是寻找放射性矿化的重要方向。研究成果可为矿山资源综合利用及放射性防护工作提供地质依据。

Some radioactive minerals such as uraninite,thorium containing uraninite,thorite and thorium occur in the quartz vein,granite and greisen of Shirenzhang quartz vein type tungsten deposit in Northern Guangdong.In order to explore the existence of radioactive mineralization,some rules are found by systematic study,including that：1）Radioactive elements（U,Th）content in tungsten-quartz veins is relatively low,most of them are lower than the Clark values of crust;2）The average content of granite is 2-10times higher than U-bearing granites in Southern China;3）The content of U and Th in greisen is more higher,and is also in tungsten veins rich in sulfide,accompanied by development of radioactive minerals;4）From the level of 550 mto 340m,radioactive element content presents variational trends from small to big in all kinds of geological body or different veins.5）In the deep of the deposit,tungsten veins rich in sulfide and greisen are the important directions for exploring radioactive mineralization.The research results can provide geological basis for the comprehensive utilization of mineral resources and radiation protection.