大兴安岭北段偃尾山铜银矿床流体包裹体与矿床成因类型研究

发布时间：2018-04-04 22:20

  本文选题：偃尾山铜银矿床　切入点：围岩蚀变　出处：《地质与勘探》2017年03期

【摘要】：偃尾山铜银矿床是大兴安岭北段呼中-塔源成矿带内新发现的中小型矿床。矿床围岩蚀变呈面状分布,主要蚀变类型为硅化、碳酸盐化、黄铁矿化、伊利石化、高岭石化和绢云母化。热液成矿期可分为三个阶段:成矿早期石英-黄铁矿阶段(含少量黄铜矿)、主成矿期石英-斑铜矿-黄铜矿-辉铜矿(含铜硫化物)阶段和成矿晚期石英-碳酸盐-萤石阶段(含少量方铅矿和闪锌矿)。该矿床流体包裹体主要为富液相包裹体,也有少量纯气相包裹体,未见含子矿物包裹体。主成矿阶段流体包裹体均一温度为155℃~342℃,峰值集中在160℃~230℃,冰点温度在�c3.3℃~�c0.3℃,盐度为0.53%NaC_(leqv)~5.41%Na Cleqv;流体成分以K~+、Na~+、SO_4~(2-)为主,含少量Ca~(2+)和Cl~-,气相成分以H_2O为主,含少量的CO_2;流体δ~(18)O在-11.8‰~-13.72‰之间,δD变化范围在-105‰~-137‰之间。总体上,成矿流体为低温低盐度流体,流体来源主要是大气降水,成矿流体和矿床蚀变-矿化特征显示本矿床可能为高硫型浅成低温热液矿床。流体压力的突然降低可能是成矿物质沉淀的主要机制。偃尾山矿床可能代表了区域上同时代一种新的矿床类型,后续深入研究将有助于认识该区域成矿规律和找矿方向。
[Abstract]:The Yanwei Mountain copper silver deposit is a newly discovered medium and small size deposit in the Huzhong-Tawan metallogenic belt in the northern part of the Daxinganling Mountains.The main alteration types are silicification, carbonization, pyrite, Yili petrochemical, kaolinite and sericite.The hydrothermal metallogenic period can be divided into three stages: the quartz-pyrite stage (containing a small amount of chalcopyrite) in the early metallogenic stage, the quartz-porphyrite -chalcopyrite (copper-bearing sulfide) stage in the main metallogenic stage and the quartz-carbonate stage in the late metallogenic stage.Salt-fluorite stage (containing a small amount of galena and sphalerite).The fluid inclusions in the deposit are mainly liquid rich inclusions and there are a few pure gas inclusions.涓绘垚鐭块樁娈垫祦浣撳寘瑁逛綋鍧囦竴娓╁害涓，

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