吉林荒沟山铅锌矿床热液叠加成矿作用流体来源及特征研究  

Hydrothermal Superimposed Mineralization,Characteristics and Source of Ore-Forming Fluids of the Huanggoushan Pb-Zn Deposit,Jilin Province

作　　者：彭大伟[1] 王可勇[1] 权鸿雁[1] 王志高[1] 李顺达[1] 付丽娟[1] 王一存[1] 

机构地区：[1]吉林大学地球科学学院,吉林长春130061

出　　处：《西北地质》2016年第2期105-116,共12页Northwestern Geology

基　　金：中国地质调查局地质调查项目"辽吉裂陷带构造演化及成矿作用"(1212011120156)

摘　　要：荒沟山铅锌矿床为吉南老岭多金属成矿带内的代表性矿床之一,矿体产于元古宙老岭群珍珠门组之中,受地层和韧性剪切带控制。在成矿后期,矿床经历了热液叠加成矿作用,其对成矿元素的进一步富集起到重要作用。为探究热液叠加成矿作用中流体的来源及特征,采用流体包裹体显微测温及C、H、O同位素地球化学的研究方法对热液叠加成矿期各阶段流体的性质进行研究,结果表明:Ⅰ阶段即黄铁矿-石英阶段成矿流体属中低温、低盐度的NaCl-H_2O体系;流体包裹体的δDH_2O为-74.8‰^-87.4‰,δ^(18)OH_2O为8.3‰~9.8‰,δ^(13)CV-PDB为-9.6‰^-10.8‰,具岩浆水的特点。Ⅱ阶段即方铅矿-石英阶段成矿流体为低温、低盐度的NaCl-H_2O体系;流体包裹体的δDH_2O为-91.4‰^-93.9‰,δ^(18)OH_2O为3.3‰~4.7‰,δ^(13)CV-PDB为-9.5‰^-10.5‰,具岩浆水与大气降水混合流体的特点,但仍以岩浆水作用为主。Occurred in Zhenzhumen Formation of Proterozoic Laoling Group,the Huanggoushan Pb-Zn deposit is controlled by stratum and ductile shear belt,serving as one of the most representative deposits in Laoling polymetallic metallogenic belt,southernJilinProvince.Hydrothermal superimposed mineralization was occured in the late ore-forming stage and exerted an important influence on further enrichment of ore-forming elements.In order to explore the sources and characteristics of the fluid,the microthermometry and C-D-O isotopic geochemistry methods of fluid inclusions are used to research the nature of the ore-forming fluids in each stage of hydrothermal superimposed mineralization.Results indicate thatthe ore-forming fluidof the first stage belongs to mid-low temperature,low-salt NaCl-H2 O system.TheδDH2O,δ^（18） OH_2O andδ^（13） CV-PDB ofthese fluid inclusions are-74.8‰^-87.4‰,8.3‰~9.8‰ and-9.6‰^-10.8‰,respectively,showingsome characteristics of magma water.The ore-forming fluid of the second stage belongs to low-temperature,low-salt NaCl-H2 O system.TheδDH2O,δ^（18） OH_2O andδ^（13）CV-PDBof these fluid inclusions are-91.4‰^-93.9‰,3.3‰~4.7‰and-9.5‰^-10.5,respectively,which show some characteristics about mixture fluid of meteoric water and magma water,however the magma water still play a main role.

关 键 词：成矿流体 流体包裹体 同位素地球化学 铅锌矿床 吉林省荒沟山 

分 类 号：P618.42[天文地球—矿床学] P618.43[天文地球—地质学]