粤北石人嶂钨矿放射性矿化研究

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2¹0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55010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550³40m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。

Study on radioactive mineralization of Shirenzhang Tungsten Deposit in Northern Guangdong

There are series of radioactive minerals such as uraninite, thorium containing uraninite, thorite and thorium in the quartz vein, granite and greisen of Shirenzhang quartz vein type tungsten deposit in north of Guangdong. In order to explore the existence of radioactive mineralization, it is found by system studying that radioactive elements (U, Th) content in quartz veins bearing tungsten is relatively low., most is lower than the Clark values of crust; and the average content of granite is 2~10 times higher than U-bearing granites in Southern China. The content of U and Th is highest in greisen, and also in tungsten veins, rich sulfide accompanied by development of radioactive minerals. From the level of 550m to 340m, radioactive element content presents two variation trend from small to big in all kinds of geological body or different veins. In the deep of the deposit, tungsten veins rich sulfide and greisen mineralization are the important direction for radioactivity, The research results can provide a geological basis for the comprehensive utilization of mineral resources and radiation protection.