综合物探方法在四川505地区铀矿勘查中的应用

Application of integrated geophysical methods in exploration of Uranium deposit in 505 area,Sichuan

505地区位于康滇地轴中南段,为混合岩型铀矿化分布区。采用音频大地电磁法(AMT)和地面高精度磁测相结合的综合物探方法,探测了505地区控矿构造深部地质特征。探测结果表明,混合岩地区电性面貌主要为高阻特征;混合岩化不均匀在电性剖面上表现为高阻区域中夹杂团块状低阻,且电性不均一;断裂构造在电性断面中表现为向深部延伸的舌状、囊状低阻体,在ΔT等值线平面图中反映为正负磁场分界线、串珠状正磁异常。

The 505 area located in the central-southern section of Kangdian geological axis, is an important migmatite type ura- nium mineralization area. Integrated geophysical method of AMT and ground high-precision magnetic survey is applied to detect deep geological characteristics of the ore-controlling fauh in 505 area.The deteetion results show that the migmatitearea has characteristics of high resistivity. As a result of non-uniform migmatization, high resistance area is mixed up with crumbly low resistivity body on the contour nlap of inversion resistivity and the electrical property is non-unitorm. The fault structure showed up as ligulate, cystic and low resistivity body on the contour map of inversion resistivity,but showed up as dividing line of positive-negative magnetic fiehts or bea- ded, positive aeromagnetie anomalies on the AT contour map of high-precision magnetic survey.