也门Dhi Samir铜镍矿床成因——来自流体包裹体、C-H-O-S-Pb同位素特征的制约  

Genesis of Dhi Samir copper-nickel deposit in Yemen:Constraints from fluid inclusions and C-H-O-S-Pb isotopes

作　　者：左力艳[1] ZUO LiYan(Development Research Center of China Geological Survey,Ministry of Natural Resources,Beijing 100037,China)

机构地区：[1]中国地质调查局发展研究中心,北京100037

出　　处：《矿床地质》2025年第1期248-258,共11页Mineral Deposits

基　　金：四通资源有限公司与中国地质科学院矿产资源所合作项目“也门塔伊兹省Hamurah铜镍矿床的成矿条件及找矿远景”;中国地质调查局项目“地质调查规划与部署”(编号:DD20240099、DD20243304)联合资助

摘　　要：也门DhiSamir铜镍矿床拥有独特的赋矿岩石类型和成矿模式,煌斑岩与铜镍硫化物矿床成矿作用密切相关。也门Dhi Samir铜镍矿区含矿岩体为暗色岩石钠质-弱钾质钙碱性煌斑岩。文章通过对该矿床成矿期及成矿期后的石英脉中流体包裹体的镜下及测温实验观察,表明流体包裹体类型主要有纯液相、气液两相、纯气相、含CO_(2)相、含子矿物三相包裹体5种类型。综合流体包裹体测温结果及稳定同位素测试数据认为,成矿流体来源于岩浆热液和部分变质水,成矿温度在200~400℃之间,为中高温热液体系;成矿流体盐度w(NaCl_(eq))在2%~10%之间,具有富集CO_(2)、低盐度的特征;成矿物质来源于前寒武纪造山带结晶基底,部分来源于下地壳。The Dhi Samir copper-nickel deposit in Yemen has a unique host rock type and metallogenic model,lamprophyre is closely related to the mineralization of copper-nickel sulfide deposit.The ore-hosting rock mass in the Dhi Samir copper-nickel deposit is a dark rock of sodium-weak potassium calc-alkaline lamprophyre.The fluid inclusions in the quartz veins formed during and after the ore-forming period were observed under the microscope and by temperature measurement experiments.There are five types of fluid inclusions:Pure liquid phase,gas-liquid two-phase,pure gas phase,CO_(2)-containing phase,and three phase inclusions containing daughter-minerals.The results of fluid inclusion microthermometry and stable isotope test indicate that the oreforming fluid is derived from magmatic hydrothermal fluid and some metamorphic water,and the ore-forming temperature is between 200 and 400℃,which is a medium-high temperature hydrothermal system.The salinity of ore-forming fluid is between 2%and 10%,which is rich in CO_(2)and low in salinity.The ore-forming materials originate from the crystalline basement of the Precambrian orogenic belt,and some originate from the lower crust.

关 键 词：煌斑岩 地球化学 流体包裹体 DhiSamir铜镍矿 也门 

分 类 号：P618.41[天文地球—矿床学] P618.63[天文地球—地质学]