衡阳盆地南缘大堡—灯坪地区铜铅锌矿地质特征及控矿因素探讨

Apply on Copper-lead-zinc Geological Characteristics and Orecontrolling Factors of Dabao-Dengping Region in the South Margin of Hengyang Basin

大堡—灯坪地区铜铅锌矿成因类型主要有热液充填-交代型、氧化淋滤-次生富集型和动力变质分异型,矿石类型主要有构造角砾岩型、碎裂岩型和裂隙充填型;矿化主要赋存于构造硅化碎裂岩带、硅化角砾岩带、裂隙密集带、断层接触的不整合接触带;矿体多呈脉状、囊状、透镜状或似层状产出;铜铅锌矿化具有一定的水平分带和垂直分带特征。区内地层、构造和不整合面与铜铅锌成矿关系密切,尤其是白垩系神皇山组与泥盆-石炭系的角度不整合界面对成矿有利,为区内主要控矿因素。

The genesis types of Dabao-Dengping deposit copper- lead-zinc mineralization have hydrothermal filling-metasomatic type. Oxidative leaching-secondary enrichment type and dynamometamorphic differentiation type, ore types are mainly have tectonic breccia type, fragmentation rock type and fracture filling type. Mineralization is mainly occurs in fault contact such as silicified cataclastic rock belt,silicified breccia belt,dense raptures belt and unconformable contact belt with fault contact, orebody shape occurrence characteristics are nervation, cryptomere, lenticular and quasi- lamellar. Copper- lead-zinc mineralization has a certain characteristics of level zonation and vertical zonation. The copper- lead-zinc mineralization relation is close to stratigraphy, structure and unconformity. Angular unconformity interface between Cretaceous Shenhuangshan group stratum and Devonian-Carboniferous stratum is favorable for mineralization in deposit, it is the main ore- controlling factors in the area.