综合物探方法在大营子铀钼矿勘查中的应用

大营子铀钼矿地表矿化痕迹较少,蚀变较强,在工作区中北部地表有铀钼异常显示,为了准确地查明工作区内铀钼异常体的空间分布及控矿构造,在该区通过开展氡及其子体测量、大功率激电测量、高精度磁法测量及可控源音频大地测量,在铀钼异常点附近发现氡异常晕8个、圈定了2条激电异常带;推断出断裂构造3条;在氡及其子体测量、大功率激电测量及高精度磁法测量工作的基础上,选择有利异常位置布置可控源音频大地电磁测量剖面1条,依据二维电阻率反演结果推断出了断裂的空间展布形态,并预测出有利成矿地段。经钻探查证,揭露到钼工业矿体6段,铀工业矿体1段,铀异常体3段。在该铀钼矿区开展综合地球物理方法取得了较显著的找矿效果,同时也为寻找同类铀钼矿提供借鉴意义。

Application of comprehensive geophysical prospecting methods to the exploration in Dayingzi uranium-molybdenum deposits

The surface mineralization trace of uranium-molybdenum polymetallic deposit in the Dayingzi area is less with strong alteration, uranium-molybdenum anomalies show on the surface in the north-central part of the studing area. In order to accurately identify the spatial distribution and ore-controlling structures of uranium-molybdenum anomalies in the studying area, radon and its daughters survey, High-power IP survey, high-precision magnetic survey and CAMT have been applied in this area. 8 radon abnormal halos are discovered near the uranium-molybdenum abnormal point. 2 IP anomalous bands were delineated near the uranium-molybdenum anomalous point by high-power IP method. 3 fault structures are deduced by high-precision magnetic survey in this area. On the basis of radon and its daughters survey and high-power IP survey and high-precision magnetic survey, we designed a CSAMT section in advantageous anomalous position. We predicted the favorable metallogenic areas based on the results of 2D resistivity inversion, which deduced spatial distribution pattern of faults. After drilling verification, 6 sections of molybdenum industrial ore-body, 1 economic uranium ore body and 3 section of uranium anomaly body were exposed. The comprehensive geophysical methods have achieved good prospecting effect in this uranium-molybdenum ore area, and it also provides guidance and reference for similar uranium-molybdenum deposits.