投稿时间：2015-01-29
修订日期：2015-01-04
网络发布日期：2016-04-29
中文摘要:五凤-五星山金矿床是延边地区重要的金矿床类型之一。五凤金矿床、五星山金矿床位于石人火山断陷盆地的南北端,相距近3 km。五凤矿体产在金沟岭组火山岩内,为脉状,五星山矿体产在碱性花岗岩与次粗面安山岩接触带上,为网脉-浸染状。笔者运用显微测温、激光拉曼探针技术,对矿床中各个矿化阶段石英内的流体包裹体进行研究。实验结果表明:① 流体包裹体类型主要为气液两相包裹体,纯液相包裹体, 少量含CO2三相的包裹体;② 均一温度变化范围在110~440℃之间,与石英脉阶段(Ⅰ)、含硫化物-石英脉阶段(Ⅱ)、方解石石英脉阶段(Ⅲ)以及方解石-沸石阶段(Ⅳ)4个矿化蚀变阶段相对应的流体包裹体的均一温度分别为440~350℃、340~220℃、220~160℃、160~110℃;③ 盐度w(NaCleq)变化在0.53%~9.47%之间,Ⅰ、Ⅱ、Ⅲ、Ⅳ矿化阶段成矿流体的盐度w(NaCleq)分别为2.23%~4.63%、9.47%~2.88%、3.85%~1.21%和0.87%左右;④ 气体成分主要为H2O、CO2,少量H2S、CH4、N2。上述结果和硫、碳、氢氧同位素数据,与成矿有关的岩浆作用研究成果,表明该矿床为低硫化型浅成低温热液金矿床,初始成矿流体为大气水,有少量岩浆水参与的中低温、低盐度,还原性流体,成矿物质源于壳幔相互作用的安山质岩浆,成矿机制为流体沸腾作用,可能伴有部分围岩的硫化作用。
Abstract:The Wufeng-Wuxingshan deposit is a type of important gold deposit in Yanbian. The genetically related Wufeng and Wuxingshan Au orebodies are located 3 km apart in the Shiren volcanic fault basin. Wufeng orebodies consist of vein type ones occurring in Jingouling Group volcanic rocks, and Wuxingshan orebodies occur as stockwork-disseminated ones hosted in the contact zone between alkali-feldspar granites and sub-trachyandensite. The fluid inclusions in quartz from different mineralization stages were investigated using microthermometric measurements and Raman microprobe. Some conclusions have been reached: ① There are lots of aqueous-biphase (L+V), mono-phase liquid fluid inclusions (L) and a few CO2-bearing three-phase inclusions; ② homogenization temperatures range from 110℃ to 440℃ and those of four successive mineralization stages characterized by quartz-veins stage (stage Ⅰ), sulfide-bearing quartz-veins stage (stage Ⅱ), calcite-quartz stage (stage Ⅲ), and calcite-zeolite stage (stage IV) are 440℃ to 350℃, 340℃ to 220℃, 220℃ to 160℃, and 110℃ to 160℃, respectively; ③ the salinities w(NaCleq) in the whole mineralization process are between 0.53% and 9.47%, and those ofⅠ,Ⅱ,Ⅲ, Ⅳ mineralization stage w(NaCleq) are 2.23%~4.63%, 9.47%~2.88%, 3.85%~1.21% and 0.87%, respectively; ④ the compositions of the volatile are mainly H2O, CO2 and a small amount of H2S, CH4, N2. Combined with recent studies of the magmatism associated with the mineralization, the authors hold that the Wufeng-Wuxingshan gold deposit belongs to a low sulfidation type epithermal deposit, and the ore-forming fluids are characterized by intermediate-low temperature, low salinity and reductivity, they consist of meteoric water with the addition of a little magmatic water, the metallogenic materials may have been derived mainly from andesitic magma induced by crust-mantle interaction, and the metallogenic mechanism seems to have been boiling of the ore-forming fluids possibly accompanied by wall-rock sulfidation.
keywords:geochemistry fluid inclusion fluid evolution mineralization Wufeng-Wuxingshan gold deposit Yanbian area
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中图分类号：P618.51
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基金项目:本项研究得到国家自然科学基金(批准号: 40472050; 40772052)、省科技厅项目(批准号: 20160520083JH)、校青年基金项目(批准号: 320130026)资助
引用文本：
门兰静,孙景贵,陈雷,逄伟.2016.延边地区五凤-五星山金矿床成矿流体与成矿作用研究[J].矿床地质,35(2):381~394MEN LanJing,SUN JingGui,CHEN Lei,PANG Wei.2016.Ore-forming fluid and mineralization of Wufeng-Wuxingshan gold deposit, Yanbian area[J].Mineral Deposits35(2):381~394
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