湖南衡阳柏坊铜矿床地质特征及成因分析

Geological Characteristics and Genetic Analysis of Bofang Deposit in Hengyang,Hunan Province

柏坊铜矿床为湖南省境内中新生代陆相红层盆地(衡阳盆地)内重要的铜矿床.矿区内矿体主要赋存于白垩系红色碎屑岩系浅色砂岩层、白垩系地层与石炭系地层不整合接触带、F22断裂破碎带及下伏的石炭系壶天群灰岩内.白垩系地层和断裂构造为矿床基本成矿地质条件.白垩系赋矿围岩微量元素含量(紫色砂岩中Cu元素含量为91×10^(-6);浅色砂岩中Cu元素含量为144×10^(-6))指示白垩系地层可能为矿床的形成提供了部分成矿物质.综合矿床宏观地质特征及成矿地质条件分析,认为柏坊铜矿为沉积-改造型铜矿床.

Bofang Copper Ore Deposit is one of the most important deposits in Meso-Cenozoic terrestrial red-bed basin （Hengyang basin） in Hunan, China. The ore bodies in Bofang deposit hosted in Cretaceous sandstone, the unconformity contact plane between Cretaceous formation and Carboniferous strata, the shattered fault zone of F22 and Hutian limestone. The trace element content of Cretaceous ore-hosted rocks （ copper content of red sandstone is 91×10^-6, copper content of greenish sandstone is 144×10^-6） indicates that the metallogenic material can derive from Cretaceous strata. The rocks of Cretaceous strata and fault structure are significant ore-forming geologic conditions in Bofang mine area. Study on the mac- roscopic geological features of ore deposit and ore-forming geologic conditions shows that it is a copper deposit of sedimentation reformation type.