王升鹏,杨倩倩,齐忠友,陈晨,王童,钱鸿.大兴安岭呼中钼多金属矿床成矿流体特征及成矿机制[J].贵州地质,2018,35(2):118-124
大兴安岭呼中钼多金属矿床成矿流体特征及成矿机制
Metallogenic Fluid Characteristics and Metallogenic Mechanism of Huzhong Mo Polymetallic Deposit in Greater Khingan Mountains
  
DOI:
中文关键词:  钼多金属矿床  流体包裹体特征  成矿机制  大兴安岭
英文关键词:Mo polymetallic deposit  Liquid inclusion characteristics  Metallogenic mechanism  Greater Khingan mountains
基金项目:
作者单位
王升鹏 成都理工大学地球科学学院四川成都 610059 
杨倩倩 成都理工大学地球科学学院四川成都 610059 
齐忠友 黑龙江省区域地质调查所黑龙江哈尔滨150080 
陈晨 成都理工大学地球科学学院四川成都 610059 
王童 成都理工大学地球科学学院四川成都 610059 
钱鸿 成都理工大学地球科学学院四川成都 610059 
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中文摘要:
      大兴安岭呼中镇钼多金属矿床产于早白垩世碎裂花岗岩中,矿体形态似层状、脉状或透镜状。成矿阶段分为辉钼矿阶段、铜铅锌阶段、方解石阶段等3个阶段。本矿床中的包裹体主要有气液H2O包裹体、气相H2O包裹体、含子矿物H2O包裹体,CO2包裹体、CO2-H2O包裹体等五大类。辉钼矿阶段均一温度为209.2℃413.4℃,盐度ω(NaCleq)为0.53%16.53%,平均值7.3%,属中低盐度,成矿压力在53.368.5 MPa,相应的成矿深度为2 0522 807 m;铜铅锌阶段为191.5℃351.0℃,盐度ω(NaCleq)为0.88%34.24%,平均值3.96%,属低盐度;方解石阶段207.2℃233.5℃,盐度ω(NaCleq)为3.55%4.18%,平均值3.77%,为低盐度。从辉钼矿阶段到铜铅锌阶段再到方解石阶段,温度及盐度逐渐降低。辉钼矿成矿压力在53.372.9 MPa,成矿深度为2 0522 807 m。成矿过程中发生了CO2-H2O不混溶作用,这是导致辉钼矿沉淀的主要机制。矿床类型属中低温浅成热液型矿床。
英文摘要:
      Huzhong Mo polymetallic deposit in greater Khingan mountains occurred in the early Cretaceous cataclastic granite. The orebody is stratoid,vein and lentoid. The metallogenic stage is divided into 3 stages:molybdenite stage,copper-lead-zinc stage and calcite stage. The inclusion of this deposit can be divided into H2O inclusion,pure gas phase inclusion,daughter mineral bearing H2O inclusion,CO2 inclusion,CO2-H2O inclusion. During the molybdenite stage,the inclusion’s homogenization temperature vary from 209.2℃ to 413.4℃,the salinity vary from 0.53% to 16.53%,7.3% average,middle-low salinity. The ore-forming pressure vary from 53.3MPa to 68.5MPa and the metallogenic depth is 2052 to 2807m,during the copper-lead-zinc stage,the temperature vary from 191.5℃ to 351.0℃,the salinity vary from 0.88% to 34.24%,3.96% average,low salinity. During the stage of calcite,the temperature vary from 207.2℃ to 233.5℃,the salinity vary from 3.55% to 4.18%,3.77% average,low salinity. The temperature and salinity is gradually decrease from the molubdenite stage to the calcite stage. The metallogenic pressure of molybdnite is 53.3MPa to 72.9MPa,the depth is 2052 to 2807m. During the mineralization,the immiscibility of CO2-H2O is the main mechanism leading to the precipitation of molybenite. The deposit belongs to a middle-low temperature and epithermal deposit.
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