综合物探方法在新城子盆地五间房地区铀矿勘查中的应用

Application of Comprehensive Geophysical Methods in Uranium Exploration in Wujianfang Area of Xinchengzi Basin

新城子盆地为中生代陆相火山盆地,经过多期次的构造运动及风化剥蚀致使地表岩石破碎,构造形迹不明显,对铀成矿规律的总结及深部勘查带来很大困难。为解决区域基岩出露情况较好但岩石破碎的找矿难题,采用地面伽马能谱、高精度磁测与可控源音频大地电磁测量(CSAMT)等方法,结合研究区地质特征和物性资料,推断解译了14条断裂及2条剖面的岩性垂向分布、空间展布情况和铀富集成矿的有利区域。根据ZK1、ZK2、ZK3、ZK4、ZK5钻孔的揭露情况,查证了断裂的存在并揭露到3段工业铀矿体。本次成功找矿案例为合理运用物探方法寻找铀矿提供了借鉴,同时预示该地区外围及深部具有很大的找矿前景。

The Xinchengzi basin is a Mesozoic continental volcanic basin that underwent multiple stages of tectonic movements and weathering,resulting in the fragmentation of surface rocks and unclear structural features.This poses great difficulties in summarizing uranium mineralization patterns and conducting deep exploration.In order to solve the problem of mineral exploration in areas with good exposure of bedrock but fractures were well developed,methods such as ground gamma spectroscopy,high-precision magnetic measurement,and controllable source audio magnetotelluric measurement(CSAMT)were used,combined with geological characteristics and physical property data of the study area.The vertical and spatial distribution of lithology of 14 faults and 2 profiles,as well as potential areas for uranium enrichment and mineralization,have been inferred and interpreted.Through the verification of ZK1,ZK2,ZK3,ZK4,and ZK5 drilling holes,the existence of the faults were verified and three industrial uranium ore bodies were exposed.This successful exploration case provides a reference for the rational use of geophysical methods to search for uranium deposits,and also indicates that there is a great potential for mineral exploration in the periphery and deep parts of the region.