延边地区五凤-五星山金矿床成矿流体与成矿作用研究

发布时间：2018-01-13 15:15

本文关键词：延边地区五凤-五星山金矿床成矿流体与成矿作用研究　出处：《矿床地质》2016年02期 　论文类型：期刊论文

【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CO_2三相的包裹体;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(Na Cleq)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H_2O、CO_2,少量H_2S、CH_4、N_2。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]:Wufeng - wuxingshan gold deposit is one of the important types of gold deposits in Yanbian area. Wufeng wuxingshan gold deposit, the gold deposit is located in the volcano rift basin north and south end, are nearly 3 km. orebody in Wufeng Jingouling volcano rock group, vein, wuxingshan orebodies in alkaline granite and rough andesite contact belt, net vein disseminated. The author uses the micro thermometry, laser Raman microprobe technique, research on fluid inclusions of different mineralization stage in quartz deposits. The experimental results show that 1 types of fluid inclusions are gas-liquid inclusion, pure liquid inclusions and inclusions containing a small amount of CO_2 three phase; 2 homogenization temperature changes in the range of 110~440 DEG, and the quartz vein stage (I), containing sulfide quartz vein stage (II), (III) calcite quartz vein stage and calcite zeolite phase (IV) 4 mineralization stages corresponding to the The homogenization temperature of fluid inclusions are 440~350 degrees, 340~220 degrees, 220~160 degrees, 160~110 degrees; 3 W salinity (NaCleq) changes between 0.53%~9.47%, I, II, III, IV w salinity of ore-forming fluid mineralization stage (Na Cleq) were 2.23%~4.63%, 9.47%~2.88%, 3.85%~1.21% and 0.87% of the 4 gas component; mainly for H_2O, CO_2, CH_4, N_2. and a small amount of H_2S, and the results of sulfur, carbon, hydrogen and oxygen isotope data, research results of magmatism and mineralization of the deposit, shows that the low sulfide epithermal gold deposit, the ore-forming fluid is the initial atmospheric water, a low temperature, a small amount of magmatic water in low salinity, reducing fluid, metallogenic material derived from crust mantle interaction in andesitic magma, the mineralization mechanism for fluid boiling, vulcanization may be accompanied by a part of the surrounding rock.

【作者单位】：长春工程学院;吉林大学地球科学学院;
【基金】：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
【分类号】：P618.51
【正文快照】： 浅成低温热液金矿床是世界上最重要的金矿床类型之一,也是国际矿床学研究的热点。目前常将浅成低温热液金矿床分为低硫化型和高硫化型两类。近年来,环太平洋地区发现了大量的浅成低温热液型金矿床。延边地区位于中国东部陆缘,属于太平洋成矿域的一部分,该区亦发育浅成热液型、

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