【作者】 汪禄波； 戴霜； 张莉莉； 张翔； 李荣西； 张瑞； 张明震；

【Author】 WANG Lu-bo;DAI Shuang;ZHANG Li-li;ZHANG Xiang;LI Rong-xi;ZHANG Rui;ZHANG Ming-zhen;Research School of Arid Environment and Climate Change,Lanzhou University;Key Laboratory of Western China’s Environmental Systems of Ministry of Education,Lanzhou University;Geological Survey of Gansu Province;School of Earth Science and Resources,Chang’an University;

【机构】 兰州大学西部环境与气候变化研究院； 兰州大学西部环境教育部重点实验室； 甘肃省地质调查院； 长安大学地球科学与资源学院；

【摘要】 贾公台金矿床是秦祁昆造山系南祁连党河南山地区最具代表性的金矿床之一。为了查明其矿床成因类型,对贾公台金矿床进行矿床地质特征的系统性研究和成矿主阶段流体包裹体的测温及激光拉曼测试分析。结果表明:矿床位于NW向与NE向构造的交汇部位,矿化产于下奥陶统上岩组浅变质海相碎屑岩和花岗岩中,严格受NW向断裂控制;矿体主要呈脉状、透镜状,Au品位较高(1.98×10-6),有害组分少,且伴生Ag;成矿主阶段流体包裹体类型为气液两相包裹体及少量气体包裹体;成矿流体为低盐度、低CO2含量的NaCl-H2O体系,成矿温度为236℃~245℃(中温),成矿压力为48.7~51.4MPa,对应深度为5.56~5.72km;经与浅成热液型金矿、造山型金矿主要特征进行对比,初步厘定贾公台金矿床为浅成热液型金矿床。更多还原

【Abstract】 Jiagongtai gold deposit is one of the most representative gold deposits in the south of Danghenanshan Mountain,Qinling-Qilian-Kunlun orogenic system.In order to find out the genetic type of Jiagongtai gold deposit,the geological characteristics were studied,and microthermometry and Laser Raman analysis of fluid inclusions in quartz of metallogenic stages were explained.The results show that the gold deposit locates at the intersection of NW-structure and NE-structure,mineralization occurs in the granite and epimetamorphic marine clastic rocks of Lower Ordovician upper group and is strictly controlled by the NW-structure;most of the ore bodies are vein or lens-like with high grade of Au(1.98×10-6),accompanying Ag and a small amount of harmful components;fluid inclusions in quartz of metallogenic stage have mainly two types,including gas-liquid two-phase and a little of gas-rich phase;the ore-forming fluid is NaCl-H2 O system with low salinity and low CO2,the metallogenic temperatures(236 ℃-245 ℃)are middle,metallogenic pressures are 48.7-51.4MPa,and the corresponding depths for gold mineralization are 5.56-5.72km;compared with the key features of epizonogenic hydrothermal-and orogenictypes gold deposits,it is preliminarily confirmed that Jiagongtai gold deposit is an epizonogenic hydrothermal deposit.更多还原