江西省村前铜多金属矿床成矿流体性质与物质来源:流体包裹体及硫铅同位素证据  

Properties of Ore-forming Fluids and Materials Source of the Cunqian Copper Polymetallic Deposit,in Jiangxi: Evidences from Fluid Inclusions and S-Pb Isotopes

作　　者：王强[1,2] 沈利军[2] 肖倩茹[2] WANG Qiang;SHEN Li-jun;XIAO Qian-ru(Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation, Ministry of Land and Resources, Chengdu 610059, China;College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China)

机构地区：[1]国土资源部构造成矿成藏重点实验室,成都610059 [2]成都理工大学地球科学学院,成都610059

出　　处：《矿物岩石地球化学通报》2017年第5期797-806,共10页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：中国地质调查局地质调查项目(1212011120846)

摘　　要：为揭示村前铜多金属矿床成矿流体性质与物质来源,为矿床成因的深入研究提供依据,对铁铜硫化物石英脉中的流体包裹体和金属硫化物进行硫、铅同位素分析测试。结果显示,铁铜硫化物石英脉中存在纯液相、气液两相、气液固三相和纯(极富)气相4种类型流体包裹体。流体包裹体均一温度范围为256~417℃,流体盐度则分为明显的两个族群,一为低盐度(7.15%~13.88%NaCl_(eqv))的气液两相包裹体,另一为高盐度(31.93%~43.79%NaCl_(eqv))的气液固三相包裹体,且二者在空间上具有共存关系,代表了流体的沸腾作用,成矿流体属中高温、高盐度岩浆热液流体。硫、铅同位素研究表明,矿石硫同位素组成为接近1的正值,属深源硫;铅同位素指示矿石中铅主要为上部地壳来源,有少量幔源铅或壳幔混源的造山带铅,表明上部地壳对矿质来源具有重要的贡献作用。Studies of fluid inclusions in quartz,and sulfur and lead isotopes of sulfides from Fe-Cu sulfide-bearing quartz veins have been undertaken in this paper in order to reveal properties of the ore-forming fluid and the source of ore-forming materials,and to provide the basis for studying metallogenesis of the Cunqian copper polymetallic deposit. Results show that there are four types of fluid inclusions in the Fe-Cu sulfide-bearing quartz veins from orebodies. They are aqueous single-phase inclusion（ type Ⅰ）,liquid-vapor two phase inclusion（ type Ⅱ）,halite-bearing three phase inclusion（ type Ⅲ）and vapor single phase inclusion（ type Ⅳ）. Their homogenization temperatures vary from 256℃ to 417℃. Salinities of Type II inclusions vary from 7. 15% to 13. 88%,while those of type III inclusions vary from 31. 93% to 43. 79% Na Cleqv.The co-existence of type II and type III inclusions indicates that these inclusions were trapped in the state of fluid boiling.The ore-forming fluid is a type of medium to high temperature and high salinity fluid. Sulfur and lead isotope studies show that S isotope compositions of ores are closes to 1,indicating sulfur was originated from deep source. In addition,Pb isotopes indicate the Pb of ores was mainly originated from the upper crust,with a small amount of the mantle-derived Pb or the crust-mantle mixed Pb from the orogenic belt,indicating that the upper crust has an important contribution to theoreforming materials of the deposit.

关 键 词：流体包裹体 硫、铅同位素 钦杭成矿带 村前铜多金属矿床 

分 类 号：P597[天文地球—地球化学] P618.2[天文地球—地质学]