华北地台北缘东部地区金矿成矿地质特点及预测

Metallogenic geological characteristics and prediction of the gold deposits in east part on northern margin of North China Platform

工作区处于华北地台北缘与内蒙古大兴安岭地槽褶皱系的交汇部位,构造复杂,EW向古基底构造中的深大断裂间形成了金、铜、铅锌、银多金属矿带。金矿多分布在太古代或元古代的变质岩系中,多属古老基底隆起区的边部或受断裂构造控制的内部。含金石英脉型、构造破碎蚀变岩型、岩浆热液脉型是本区的主要类型,经预测该区约有378t金矿资源找矿潜力,划分出两个成矿带和八个成矿区。

The studying area,whose structure is complicated and where the major and deep faults in EW trend paleo-basement structure host a Au-Cu-Pb-Zn-Ag polymetallic belt,is located at the intersection part of northern margin of North China Platform and Daxing'anling geosynclinal folded system in Inner Mongolia.Most gold deposits distributed in Archaean or Proterozoic metamorphic rocks system, the majority of which located on the margin of ancient basement uplift or in the inside controlled by fault structures.Au-bearing quartz vein type,structure-broken altered rock type and magma hydrothermal vein type are the main metallogenic types in this area.About 378t gold resources for potential prospecting are predicted,as well as two metallogenic belts and eight ore-forming areas are divided.