湖南锡田钨锡多金属矿田成矿分带样式及机理  

Mineralization zone styles and mechanism of Xitian Tin-Tungsten Polymetallic orefield, Hunan Province

作　　者：刘飚[1,2] 吴堑虹[1,2] 奚小双[1,2] 孔华[1,2] 蒋江波 林智炜 曹荆亚[1,2] LIU Biao;WU Qianhong;XI Xiaoshuang;KONG Hua;JIANG Jiangbo;LIN Zhiwei;CAO Jingya(School of Geosciences and Info-Physics,Central South University,Changsha 410083,China;Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring,Ministry of Education,Central South University,Changsha 410083,China)

机构地区：[1]中南大学地球科学与信息物理学院,湖南长沙410083 [2]中南大学有色金属成矿预测与地质环境监测教育部重点实验室,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2018年第3期633-641,共9页Journal of Central South University:Science and Technology

基　　金：中国地质调查局整装勘查项目(12120114052101)~~

摘　　要：为了探索锡田矿田内矿床分布规律及其成矿热液系统内在联系,对区内燕山期14个岩浆热液矿床野外特征进行调查和显微矿相学观察,采用将矿化类型、矿石矿物组合和成矿均一温度相结合的方法对区域矿化规律进行研究。研究结果表明:矿田内存在南、北2个成矿区域,各自拥有独立成矿热液中心,并且存在明显的钨锡—铅锌—萤石矿床分带规律;流体包裹体均一温度的空间分布与矿化分带相一致,从钨锡矿带(215~384℃)到萤石矿带(136~194℃)连续分布;南、北2个成矿区域白钨矿稀土元素特征均为轻、重稀土元素富集,中稀土亏损,正Eu异常明显(δw(Eu)=7.93~43.58),稀土配分模式均为典型"W"型,反映成矿物质来源相似;其成矿热液来源为同一燕山期成矿热液系统,其矿化分带的原因可能与燕山期岩浆热液系统温度梯度格局有关。In order to understand the distribution disciplinarian of ore deposits and their genetic relationship in Xitian ore-forming system,fourteen Yanshanian magmatic-hydrothermal deposits were studied through geological survey and microscopic mineralogy observation.The distribution of mineralization type,ore mineral association and homogenization temperature of fluid inclusions in Xitian orefield were determined.The results show that there are two ore-forming regions distributed in the southern and northern Xitian area,respectively,and each of the region has its own hydrothermal center with a clear regular zone mineralization distribution of W-Sn,Pb-Zn and fluorite deposits.Homogenization temperature of fluid inclusions is consistent with mineralization zone in term of spatial distribution.The temperature decreases continuously from W-Sn deposits(215?384℃)to fluorite deposits(136?194℃).Two ore-forming systems show high concentrations of LREE and HREE,low concentrations of MREE,obvious positive Eu anomalies(δw(Eu)=7.93?43.58),and the W-type chondrite-normalized REE patterns.Combined with S and Pb isotopic data and mineralization age in the orefield,these ore deposits are formed in the Yanshanian magmatic-hydrothermal event with similar source of mineralizing components,and the minerogenic zoning patterns may be constrained by the thermal gradient pattern of the magmatic-hydrothermal system.

关 键 词：矿化分带 矿物组合 均一温度 稀土配分模式 锡田矿田 

分 类 号：P612[天文地球—矿床学]