河北省御道口地区铀矿找矿远景分析

Abstract

御道口地区位于冀北燕辽成矿带与大兴安岭成矿带南段的交叠部位。中生代该区处于由东西向构造域转为北东向构造域的过渡时期,即动力学背景由挤压转向伸展拉张的过渡时期。该时期区内火山活动频繁,火山旋回发育，火山成因多样，多金属成矿作用广泛而普遍。此次地面物理勘探主要应用地面伽玛能谱测量，进行了地质推断解释，并提出了铀找矿有利地段：御道口地区铀成矿应定位于多组断裂交汇部位，具有中高阻、低磁的地球物理特征，铀含量及钾含量均有异常显示。根据区内综合物探测量，结合区内铀矿赋存地段的特征，推测区内上天桥地段和推测的3号异常地段为区内铀找矿有利地段。 Yudaokou area is located at the parts where the northern Hebei Yanliao metallogenic belt and the southern section overlapped. Mesozoic was a transition period when this area turned from East- West tectonic domain to North-East tectonic domain, which means the dynamic background was changed from extrusion to tension. This area had frequently volcanic activity in Mesozoic, volcanic cycles developed, volcanic formation varied and poly-metallic mineralization were universal. The geophysical exploration mainly used the gamma energy spectrum measurement, and we had interpreted the inference of geologic. What’s more, we also proposed favorable areas of uranium prospecting: the uranium mineralization should be located in the intersection part of the groups of fracture in Yudaokou Area, where the geophysical characteristics show middle to high resistance, low magnetic and abnormality of Uranium content and potassium content. According to the integrated geophysical measurement we acquired in this area and combining the feature of occurrence in uranium deposits, we speculate that Shangtianqiao and No. 3 abnormal area are the favorable areas of uranium prospecting.