安徽姚家岭锌金多金属矿床地质特征与浅部矿化流体包裹体研究  

Geological characteristics and fluid inclusion studies of shallow mineralization in Yaojialing Zn-Au-polymetallic deposit,Anhui Province

作　　者：文春华[1,2] 徐文艺[3] 钟宏[1] 吕庆田[3] 杨竹森[3] 田世洪[3] 刘英超[3] 

机构地区：[1]中国科学院地球化学研究所矿床地球化学国家重点实验室,贵州贵阳550002 [2]中国科学院研究生院,北京100049 [3]中国地质科学院矿产资源研究所,北京100037

出　　处：《矿床地质》2011年第3期533-546,共14页Mineral Deposits

基　　金：国土资源部公益性行业科研专项(编号:201011047;201011051);国家科技支撑计划课题(2006BAB01B01;2006BAB01B06)项目资助

摘　　要：姚家岭锌金多金属矿床是铜陵矿集区近年来新发现的一处大型矿床。该矿床可分为2个成矿期,早期为铜（金、锌）矿化,晚期为锌（金银）多金属矿化,以后者为主。多金属硫化物期以大量发育多种不规则脉状和角砾状矿石为特征,发育硅化、绿泥石化和高岭土化,矿化受张性构造控制,矿物组合为富铁闪锌矿、黄铁矿、黄铜矿、方铅矿、石英（包括玉髓和蛋白石）、方解石、萤石、高岭石、绿泥石等,成矿流体发生多期脉动。流体包裹体显微测温显示成矿流体为中低温（167~404℃,众值区间240~280℃）、中低盐度〔w（NaC1eq）0.66%~13.62%,众值区间2%~4%〕流体,均一压力主体〈11 MPa,以静水压估算成矿深度在潜水面以下1 km左右或略深;蚀变矿化和流体包裹体研究揭示姚家岭矿床以多金属硫化物期矿化为主,应为浅成热液型锌（金银）多金属矿床。The Yaojialing Zn-Au-ploymetallic deposit is a newly-discovered large-size ore deposit in the Tongling ore concentration area.Two mineralization epochs are recognized.The early is characterized by Cu（Au）-mineralization and the late by Zn（Au-Ag） polymetallic mineralization,with the latter being dominant in Yaojialing area.The polymetallic sulfide mineralization is characterized by a variety of irregular veins and brecciated ores associated with silicification,chloritization and kaolinization,and controlled by extensional structure.The most common minerals in the second epoch are sphalerite,pyrite,chalcopyrite,galena,quartz（chalcedony and opal）,calcite,fluorite,kaolinite,chlorite etc.Multi-stage fluid pulses occurred in the late epoch.The homogenization tempe-ratures range from 167℃ to 404℃ with a peak of 240℃ to 280℃ and the salinities w（NaC1eq） range from 0.66% to 13.62%,with a mode around 2% to 4%.The main homogenization pressure is lower than 11 MPa.Mineralizing depth,estimated by hydrostatic pressure,is about or more than 1 km under the paleo-water table.A study of alteration,mineralization and fluid inclusion reveals that the Yaojialing ore deposit is dominated by epithermal-type Zn（Au-Ag） polymetallic ores.

关 键 词：地球化学 浅成热液矿床 流体包裹体 姚家岭 安徽 

分 类 号：P618.43[天文地球—矿床学] P618.51[天文地球—地质学]