内蒙古红水泉铅锌银矿床成因研究:矿物学和地球化学证据  

Genesis of the Hongshuiquan Pb-Zn-Ag deposit in Inner Mongolia:Evidences from mineralogy and geochemistry

作　　者：马鹏程 温守钦[1] 李建源 谢伟 张帅 张允[1] MA Peng-cheng;WEN Shou-qin;LI Jian-yuan;XIE Wei;ZHANG Shuai;ZHANG Yun(College of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China;Liaoning Metallurgical Geological Exploration Research Institute Co.,Anshan 114018,China;Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]辽宁省冶金地质勘查研究院有限责任公司,辽宁鞍山114018 [3]中国科学院地质与地球物理研究所矿产资源研究重点实验室,北京100029

出　　处：《矿物学报》2023年第4期547-557,共11页Acta Mineralogica Sinica

基　　金：国家重点研发计划项目(编号:2016YFC0801603)。

摘　　要：红水泉铅锌银矿床产于大兴安岭西北段的碳酸盐岩建造,矿床成因鲜有研究。本文以矿床硫化物的矿物学及地球化学特征为切入点,探讨了矿床成因及成矿物质来源。矿物学研究表明,闪锌矿存在2个世代,其微量元素FeS温度计指示主成矿阶段早期为中温范围,Zn/Cd值为160~215;方铅矿表现为富Ag、Sb贫Bi的特点;黄铁矿的Co/Ni>1,Fe/(S+As)均值为0.871。3种硫化物元素标型特征指示出中低温、中浅成、岩浆热液与沉积作用叠加的成因特点。黄铁矿、闪锌矿和方铅矿的硫同位素δ^(34)S为-6.13‰~0.25‰,均值-2.8‰,暗示硫主要是通过岩浆活动带来的深源硫,其次是赋矿碳酸盐岩建造的地层硫,整体表现为岩浆硫与地层硫混合的特点。3种硫化物铅均值为^(206)Pb/^(204)Pb=18.46~18.55,^(207)Pb/^(204)Pb=15.59~15.65,^(208)Pb/^(204)Pb=38.08~38.51,与闪长岩铅同位素组成相似,在构造判别图解中二者呈线性相关,位于造山带与上地壳演化区间。综合来看,认为红水泉铅锌银矿床为中低温热液充填脉状铅锌银矿床。The Hongshuiquan Pb-Zn-Ag deposit is a carbonate rock formation hosted deposit in the northwestern Great Xing'an Range.Its genesis has been limitedly studied.Based on the mineralogical and geochemical characteristics of sulfides in the deposit,we have discussed the genesis and the source of ore-forming materials of the deposit in this paper.Mineralogical data show that there are two generations of sphalerites,whose trace element FeS thermometer indicating that the early main metallogenic stage occurred in the mid-temperature range,with Zn/Cd ratios ranging from 160 to 215.Galena is characterized with rich in Ag and Sb but poor in Bi.The Co/Ni ratios of pyrites are higher than 1,and the average Fe/(S+As)ratio of pyrites is 0.871.The typomorphic characteristics of these three sulfides indicate that the genesis of the deposit is characterized with the middle-low temperature,middle-shallow level,and the superimposition of magmatic hydrothermal fluid and sedimentation.The sulfur isotopes(δ^(34)s)of pyrites,sphalerites and galenas range from-6.13%o to 0.25%o,with an average value of-2.8%o,suggesting that the sulfur was mainly deep sourced sulfur derived from magma,with minor strata sulfur sourced from the ore-bearing carbonate rocks.The overall characteristics of sulfur isotopes show that the sulfur of the deposit was characterized with a mixture of magmatic sulfur and strata sulfur.The^(206)pb/^(204)pb,^(207)pb/^(204)pb,and^(208)pb/^(204)pb values of three sulfides are 18.46-18.55,15.59-15.65,and 38.08-38.51,respectively.They are is similar to lead isotopic compositions of the diorite.Lead isotopic compositions of sulfides of the Hongshuiquan deposit and those of the diorite are linearly correlated and mainly plotted in the orogenic belt and upper crust evolution interval in the tectonic discrimination diagram.In summary,it is considered that the Hongshuiquan Pb-Zn-Ag deposit is a medium-low temperature hydrothermal fluid flling vein type of Pb-Zn-Ag deposit.

关 键 词：矿物微量元素分析 成矿物质来源 碳酸盐岩赋矿 铅锌银矿床 红水泉 

分 类 号：P579[天文地球—矿物学] P618.4[天文地球—地质学]