山西省临县紫金山地区U、Th、K三种放射性元素特征分析

为了研究山西临县紫金山地区放射性矿产铀、钍、钾元素异常分布规律、含量、赋存状态,通过运用地面伽马能谱和显微镜镜下分析二者相结合的方法研究了研究区内的岩石,得到紫金山地区岩石的铀、钍、钾放射性参数和铀、钍、钾异常对应岩石的镜下分析结果。结果表明:山西临县紫金山地区铀、钍元素异常主要分布在黑云辉石岩、霞石正长岩中,它是由于这二种岩石中分布的磷灰石和榍石所以引起的,榍石和磷灰石占黑云辉石岩总量的7%～11%,榍石在霞石正长岩中的含量占总量的1%～5%;钾异常主要分布在黑云母辉石正长岩中,钾元素异常是由黑云母辉石正长岩中的正长石引起的,黑云母辉石正长岩中的正长石占整体的85%～90%。可见通过地面伽马能谱和显微镜镜下分析二者相结合的方法可以解释山西省紫金山地区放射性矿产铀、钍、钾异常分布规律、含量、赋存状态。综上,黑云辉石岩、霞石正长岩、黑云母辉石正长岩为今后放射性矿产突破所在,建议在区部署地面伽玛能谱扫面工作,再对扫面工作的异常区进行槽探及钻探工程验证。

Characteristics of Three Radioactive Elements in U, Th and K in Zijinshan Area, Linxian County, Shanxi Province

In order to study the radioactivity of rocks in the Zijinshan area of Linxian County, Shanxi Province, The rock of the study area was used to investigate by using ground gamma ray spectroscopy and microscopic microscopic analysis methods, and the radioactive parameters of uranium, thorium and potassium and the results of microscopic analysis were obtained. The results show that the uranium and thorium anomalies in the Zijinshan area of Linxian County, Shanxi Province are mainly distributed in the Heiyun pyroxenite and the nepheline syenite. The main rocks are apatite and vermiculite distributed by the Heiyun pyroxenite and the nepheline syenite. Therefore, the meteorite accounts for 7-11% of the total in the Heiyun pyroxenite, and the meteorite accounts for 1-5% of the total in the nepheline syenite; the potassium anomaly is mainly due to the feldspar of the biotite pyroxene syenite. As a result, feldspar accounts for 85-90% of the total in the biotite pyroxene syenite. It is concluded that the ground gamma spectroscopy method and microscopic microscopic analysis can explain the abnormal causes of three radioactive elements U, Th and K.