岩脚——牛倮河铅锌矿矿床成因及找矿标志

On Genesis and Prospecting Indicators of Lead Zinc Ore Deposits along Yuanjiao-Niuluo River

为进一步查明岩脚—牛倮河铅锌矿床成因类型,结合区域成矿背景,深入分析了矿床地质特征、矿石矿组合特征及围岩蚀变特征,同时对控矿构造特征进行总结,结果表明:I1、I3及I4矿体赋存于下白垩统景星组地层内,I15、I16矿体则赋存于中侏罗统和平乡组,含矿岩性均以石英砂岩及泥质砂岩为主;有用矿物以方铅矿、闪锌矿及黄铁矿为主,多呈细脉、细网脉状及团块状产出,表现出典型的后期叠加特征;矿化(体)受构造控制作用明显,NE向的F10及近SN向的F4、F5为含矿断层,近EW向的断层与褶皱则共同控制着矿体产状;矿床受早期沉积成矿作用及多期次构造作用的叠加改造,属沉积-改造型多金属矿床,地层岩性、构造及围岩蚀变等是有利的找矿标志。

To further identify the genetic type of the lead zinc ore deposits along Yuanjiao-Niuluo River,the geological characteristics of the deposit,the ore assemblage characteristics and the characteristics of wall rock alteration are analyzed in depth and the features of ore controlling structures are summarized.The result shows that：（1）I1,I3 and I4 ore bodies occur in the Lower Cretaceous Jingxing Group;I15,I16 ore bodies occur in Middle Jurassic Hepingxiang Group;and the ore bearing litho logy is mainly quartz sandstone and argillaceous sandstone;（2）Useful minerals are mainly galena,sphalerite and pyrite,which distribute in fine stockwork veinlets,and mass,showing the typical characteristics of late superimposed mineralization;（3）Mineralization is obviously affected by structural controll,F10 along NE and F4 and F5 to SN include ore fault,faults and folds to NE together control the occurrence of ore bodies;（4）Superimposed and reformed by early deposition and multi-stage tectonism,the deposit is sedimentary reforming polymetallic deposit;lithology,structure and wall rock alteration are favorable prospecting indicators.