皖南黄土岭铜矿床地质特征及找矿标志

Geological characteristics and prospecting indicators of the Huangtuling copper deposit in southern Anhui

黄土岭铜矿床位于江南造山带东段,处于下扬子成矿省江南地块中生代铜钼金银铅锌成矿带内。前期勘查工作揭示本区具有良好的铜矿成矿地质条件,铜矿体品位为0.605%~2.24%。通过分析其成矿地质条件及矿床地质特征,初步查明了黄土岭铜矿床的控矿因素和矿化富集规律。笔者认为,黄土岭铜矿赋存于西村岩组内,受祁门-三阳断裂控矿作用明显,铜矿化与黄铁矿化、硅化、绿泥石化等蚀变作用关系密切,矿床成因类型为热液充填型。本文初步总结了岩石地层、围岩蚀变、成矿构造、物化探异常等有效的找矿标志,可为皖南地区寻找同类型矿床资源提供实践经验和理论依据。

The Huangtuling copper deposit is located in the eastern section of the Jiangnan orogenic belt,and is situated in the Mesozoic Cu-Mo-Au-Ag-Pb-Zn metallogenic belt of the Jiangnan block,lower Yangtze metallogenic province.The previous exploration work revealed that the area has good geological conditions for copper mineralization,with an average grade of 0.605%~2.24%.Based on the analysis of metallogenic geological conditions and geological characteristics of the deposit,the ore-controlling factors and mineralization enrichment rules have been preliminarily identified.It is suggested that the Huangtuling copper deposit is hosted in the Xicun formation-complex and is obviously controlled by the Qimen-Sanyang fault.The copper mineralization is closely related to the alterations of pyritization,silicification and chloritization.The copper deposit is of hydrothermal filling type in genesis.The effective prospecting indicators such as in rock strata,wall rock alteration,metallogenic structure,and geophysical and geochemical anomalies are preliminarily summarized,which can provide practical experience and theoretical basis for searching mineral resources of the same type in southern Anhui.