甘肃省西和县安溪沟金矿地质特征与找矿潜力分析

Geological characteristics and prospecting potential of anxigou gold deposit in Xihe County,Gansu Province

安溪沟金矿位于吴家山复式背斜西转折端的安家岔组中,主要受张扭性断裂构造等控制,强黄铁矿化、褪色蚀变、铁白云石化、硅化等蚀变与金矿化关系密切,矿床类型为中低温岩浆期后热液型。目前发现金矿化带两条,圈定金矿体5条,金矿化体5条,矿石类型为构造角砾岩型和顺层挤压片理化蚀变岩型两种。矿体与Au相关的化探异常、低阻高极化激电异常对应较好,通过成矿地质背景、物化探异常特征、相邻金矿床对比,矿区及外围构造蚀变岩型金矿找矿潜力较好。

Anxigou gold deposit is located in ANJIACHA formation at the West turning point of Wujiashan compound anticline.It is mainly controlled by tension and torsion faults.Strong pyritization,fading alteration,iron dolomitization,silicification and other alterations are closely related to gold mineralization.The deposit type is post magmatic hydrothermal type.At present,two gold mineralization belts have been found,five gold mineralization bodies have been delineated and five gold mineralization bodies have been identified.The ore types are tectonic breccia type and bedding compression schistosity altered rock type.The ore body corresponds well with Au related geochemical anomalies and low resistivity and high polarization induced polarization anomalies.Through the metallogenic geological background,geophysical and geochemical anomaly characteristics,and the comparison of adjacent gold deposits,the prospecting potential of structural altered rock type gold deposits in the mining area and its periphery is good.