胶东盘子涧金矿床成矿流体特征--来自包裹体、H-O同位素证据  

Characteristics of ore-forming fluids in the Panzijian gold deposit,Eastern Shandong Penisula-Evidence from fluid inclusions and H-O

作　　者：智云宝[1,2] 王英鹏 范海滨[3] 王巧云 董健 马莉[1,2] 谢颂诗 郝兴中[1,2] 刘芳 李瑞翔[4] ZHI Yunbao;WANG Yingpeng;FAN Haibing;ANG Qiaoyun;DONG Jian;MA Li;XIE Songshi;HAO Xingzhong;LIU Fang;LI Ruixiang(Shandong Institute of Geological Survey,Jinan250014;Shandong Engineering Research Center for Geochemistry and Pollution Prevention and Control of Land Quality,Jinan250014;The Fourth Geological Brigade of Shandong Provincial Bureau of Geology and Mineral Exploration and Development,Weifang,Shandong261021;No.6 Institute of Geology and Mineral Resources Exploration of Shandong Province,Zhaoyuan,Shandong265400)

机构地区：[1]山东省地质调查院,济南250014 [2]山东省土地质量地球化学与污染防治工程技术研究中心,济南250014 [3]山东省地质矿产勘查开发局第四地质大队,山东潍坊454000 [4]山东省地质矿产勘查开发局第六地质大队,山东招远265400

出　　处：《地质论评》2024年第2期529-540,共12页Geological Review

基　　金：中国地质调查局项目(编号:121201004000150017-60);山东省地质勘查项目(编号:鲁勘字(2021)2号)的成果。

摘　　要：盘子涧金矿床地处华北板块胶辽隆起区,栖霞—蓬莱金成矿带上。金矿的形成主要与区内控矿断裂——盘子涧断裂和中生代岩浆岩有关。为研究该矿床成矿流体性质及演化,并控讨矿床成因,对该矿床不同阶段的包裹体进行岩相学、显微测温、包裹体激光拉曼及H—O同位素分析研究。盘子涧金矿床成矿热液期可划分为4个成矿阶段,从早到晚分别是黄铁矿—石英阶段(Ⅰ阶段)、石英—黄铁矿(绢云母)阶段(Ⅱ阶段)、金—石英—多金属硫化物阶段(Ⅲ阶段)和石英—碳酸盐阶段(Ⅳ阶段)。其中Ⅱ、III阶段为主成矿阶段。不同成矿阶段的流体包裹体有3种类型,分别是富液气液两相盐水包裹体、含CO_(2)三相包裹体和纯液相包裹体。显微测温结果显示,成矿流体的完全均一温度介于142~348℃,主要集中于200~300℃,盐度介于4.44%~10.98%NaCl_(eqv)。石英的δD_(V-SMOW)值为-74.6‰~-68.5‰,δ^(18)O_(V-SMOW)值为+11.65‰~+13.92‰。显示成矿流体为中低温、低盐度的CO_(2)—H_(2)O—NaCl体系,来源于地幔,以岩浆热液为主,并伴有部分大气降水加入。矿床成因类型属石英脉型金矿。The Panzijian gold deposit is located in the Jiaoliao uplift area of the North China Block and on the Qixia—Penglai gold metallogenic belt.The formation of gold deposits is mainly related to Panzijian fault and Mesozoic magma in the region.Methods:In order to study the characteristics and evolution of ore-forming fluid and genesis of the deposit,Petrography,microthermometry,laser Raman spectroscopyand H—O isotope analysis of inclusions in different stages of the deposit are studyed.Results:The ore-forming hydrothermal period of the deposit can be divided into 4 metallogenic stages,from early to late,they are pyrite—quartz stage(Ⅰ),pyrite—sericite—quartz stage(Ⅱ),gold—quartz—polymetallic sulfide stage(Ⅲ)and pyrite—carbonate stage(Ⅳ).StageⅡandⅢare the main metallogenic stages.There are three types of fluid inclusions in the mineralization stage,which are two-phrase aqueous fluid inclusions、CO2-bearing fluid inclusions and liquid inclusions.The homogenous temperature of the ore-forming fluids is between 142~348℃,focusing between 200~300℃,the salinity is between 4.44%~10.98%NaCl_(equiv),δD varies from-74.6‰to 68.5‰,δ^(18)O_(V-SMOW) varies from+11.65‰to+13.92‰.Conclusions:The study of inclusions indicates that the ore-forming fluids are CO^(2)—H_(2)O—NaCl systems with medium—low temperature,low salinity,the H—O isotope shows that the ore-forming fluids are derived from the mantle,mainly composed of magmatic water and mixed with parts of metrorological water.The genetic type of the deposit is a quart vein gold deposit.

关 键 词：盘子涧金矿床 流体包裹体 H—O同位素 胶东 

分 类 号：P618.51[天文地球—矿床学]