内蒙古道嘎金矿区地质特征及找矿地球物理标志

道嘎金矿化区位于内蒙古自治区额济纳旗境内,地处北山成矿带东段。区内主要矿体均赋存于碎石山组浅变质碎屑岩以及华力西期闪长岩体中,矿体的产出主要受北东向和近东西向断裂构造控制。区内金矿化类型以含金石英脉型为主,主要发育角砾状含硫化物石英脉和含电气石石英脉两种类型矿石,矿床成因属中温热液脉型金矿床。选择成矿地质条件最为有利的Ⅰ号和Ⅳ号两条矿脉所在区域展开激电中梯测量工作,结果表明,已知矿脉出露附近激电异常较明显,其异常范围的视极化率在5%~9%之间,视电阻率在50~300Ω·m之间。因此,该区找矿有效的地球物理标志为低电阻高极化率异常。

Geological characteristics and geophysical prospecting signs of Daoga gold mining area in Inner Mongolia

Daoga gold mining area is located in the east section of Beishan metallogenic belt，Ejina County， Inner Mongolia． The orebody of this area occurred in shallow metamorphic clastic rocks of Suishishan Formation and Hercynian diorite，and the distributions of the orebody are strictly controlled by NE and EW fault structures． Gold- bearing quartz vein is the main mineralization type in this area，and the ore is mainly formed by brecciated sulfide- rich quartz veins and tourmaline- quartz veins in type，and the genesis of gold mineralization of this area is belong to mesothermal vein type． Based on the analysis of IP anomaly of veinⅠand vein Ⅳ， apparent chargeability of anoma- ly range of is from 5% to 9% and apparent resistivity is from 50 Ω·m to 300 Ω·m，which is considered the IP anomaly with low resistivity and high polarization in the surveyed area as the effective geophysical ore- hunting indication．