胶东大柳行金矿田庵口金矿床成矿流体与成矿物质来源  

Metallogenic fluid and material source of Ankou gold deposit in Daliuhang gold ore field,Jiaodong

作　　者：于晓卫[1] 张文[1] 刘汉栋[1] 王来明[1] 王巧云[1] 田瑞聪 戴广凯[1] 王英鹏[1] 王金辉[1] 陈文韬 YU XiaoWei;ZHANG Wen;LIU HanDong;WANG LaiMing;WANG QiaoYun;TIAN RuiCong;DAI GuangKai;WANG YingPeng;WANG JinHui;CHEN WenTao(Shandong Institute of Geological Survey,Jinan 250014,Shandong,China;Qilu Normal University,Jinan 250200,Shandong,China;Shandong Academy of Geological Sciences,Jinan 250014,Shandong,China)

机构地区：[1]山东省地质调查院,山东济南250014 [2]齐鲁师范学院,山东济南250200 [3]山东省地质科学研究院,山东济南250014

出　　处：《矿床地质》2023年第2期310-330,共21页Mineral Deposits

基　　金：山东自然科学基金项目(编号ZR2020MD033);山东省地质勘查项目(编号:鲁勘字(2018)19号和鲁勘字(2021)18号)联合资助。

摘　　要：庵口金矿床是位于大柳行金矿田东北部的石英脉型中型金矿床,矿体呈脉状产于郭家岭岩体内部的北东东向断裂带内。目前,对该矿床的研究相对较少,为探讨其成矿流体性质与成矿物质来源,文章通过井下观察、岩相学、流体包裹体测温、激光拉曼分析和同位素测试,将该矿床热液成矿期划分为黄铁矿石英阶段(Ⅰ)、石英黄铁矿阶段(Ⅱ)、多金属硫化物阶段(Ⅲ)和碳酸盐阶段(Ⅳ)。流体包裹体研究表明,成矿流体含富液相和富气相包裹体,包裹体气相成分以CO_(2)为主,少量N_(2)、CH_(4),总体为中低温、低盐度CO_(2)-H_(2)O-NaCl体系,成矿早期(Ⅰ阶段)和主成矿期(Ⅱ、Ⅲ阶段)温度变化不大,盐度呈降低趋势,流体演化过程中发生了流体不混溶(沸腾)。H-O同位素测试表明,成矿流体可能主要来源于郭家岭岩体出溶的岩浆水;S、Sr-Nd-Pb同位素示踪显示,成矿物质可能主要来源于重熔活化的下地壳(前寒武纪变质基底),并在向上运移过程中混入了上地壳物质。The Ankou gold deposit is a quartz vein type medium-sized gold deposit located in the northeast of Daliuhang gold ore field.The ore body occurs in a vein hosted by the NEE trending fault zone within the Guojialing intrusive body.At present,there is relatively little research on the deposit in order to explore the properties of oreforming fluid and the source of ore-forming materials.Based on underground observation,petrography,fluid inclusion temperature measurement,laser Raman analysis and H-O and Sr-Nd-Pb isotope study,the hydrothermal metallogenic period of the deposit is divided into four stages including pyrite-quartz stage(Ⅰ),quartz-pyrite stage(Ⅱ),polymetallic sulfide stage(Ⅲ)and carbonate stage(Ⅳ).The study shows that the ore-forming fluid contains rich liquid phase and rich gas phase inclusions.The gas phase composition of the inclusions is mainly CO_(2),with a small amount of N_(2) and CH_(4).It is generally a medium-low temperature and low salinity CO_(2)-H_(2)ONaCl system.In the early(Ⅰ)and main(Ⅱ&Ⅲ)metallogenic stages,the temperature changed little,while the salinity was in a decreasing tendency,and the fluid immiscibility(boiling)occurred in the process of fluid evolution.H-O isotope test shows that the ore-forming fluid mainly comes from magmatic water dissolved from the Guojialing intrusion in the early and main ore-forming stages.S and Sr-Nd-Pb isotopes tracing show that the oreforming materials mainly come from the remelting of activated lower crust(Precambrian metamorphic basement),and mixed with the materials of the upper crust in the process of upward migration.

关 键 词：地球化学 流体包裹体 同位素 成矿流体 成矿物质 庵口金矿 

分 类 号：P618.51[天文地球—矿床学]