大兴安岭北段霍洛台Ⅰ区南铜钼矿床成矿流体特征及矿床成因  

Ore-forming fluid characteristics and genesis of copper-molybdenum deposit in the southern Huoluotai AreaⅠin the Greater Khingan Mountains

作　　者：李华伟 周丹 李碧乐[1] 孙永刚[1] 于润涛 杨佰慧 李治华 Li Huawei;Zhou Dan;Li Bile;Sun Yonggang;Yu Runtao;Yang Baihui;Li Zhihua(.College of Earth Sciences , Jilin University;Jilin Zhongcheng Oil Shale Group Co., Ltd .)

机构地区：[1]吉林大学地球科学学院 [2]吉林省众诚油页岩集团有限公司

出　　处：《黄金》2019年第5期3-10,共8页Gold

基　　金：黑龙江省国土资源科研项目(黑国土科研201605);黑龙江省地质勘查科研项目(黑地勘科[2017]04号);吉林省科技发展计划项目(20180101089jc)

摘　　要：霍洛台Ⅰ区南铜钼矿床位于大兴安岭中北段的铁、铜、金、钼、钨成矿区(带)上,其成矿阶段由早至晚分为4个阶段:磁铁矿-石英-钾长石阶段(Ⅰ)、石英-辉钼矿阶段(Ⅱ)、石英-多金属硫化物阶段(Ⅲ)、石英-萤石-方解石阶段(Ⅳ)。石英-辉钼矿阶段与石英-多金属硫化物阶段为主要成矿阶段。流体包裹体类型有含CO_2三相包裹体(C型)、含子矿物包裹体(S型)、富气相包裹体(V型)、富液相包裹体(L型)。成矿流体总体属于高盐度的H_2O-NaCl-CO_2体系。该矿床中的辉钼矿主要发育在钾硅化带中,形成于早阶段高温、高盐度流体环境;黄铜矿等金属硫化物主要发育于绢英岩化带中,形成于中温富液相流体环境。辉钼矿的沉淀主要与沸腾作用和温度降低有关,黄铜矿等金属硫化物的沉淀主要由温度降低和大气水混合所致。综合分析认为,霍洛台Ⅰ区南铜钼矿床为典型的斑岩型矿床。Copper-molybdenum deposit in the southern Huoluotai AreaⅠare located on the iron,copper,gold,molybdenum and tungsten metallogenic zone(belt) sitting in the central north section of Greater Khingan Mountains.The metallogenic stages are divided into 4 phases in time:stageⅠis magnetite-quartz-potassium feldspar stage,stage Ⅱ is quartz-molybdenite,stage Ⅲ is quartz-polymetallic sulfide,and stage Ⅳ is quartz-fluorite-calcite.Quartz-molybdenite stage and quartz-polymetallic sulfide stage are the main metallogenic stages.The fluid inclusions are mainly composed of CO2-bearing 3-phase inclusion(C type),submineral-bearing inclusion(S type),gas-rich inclusion(V type),and liquid-rich inclusions(L type).Ore-forming fluids generally belong to high salinity H2O-NaCl-CO2 system.The molybdenite in the deposit mainly develops in the potassium silicification zone,and was formed in the early stage of high temperature and high salinity fluid environment;polymetallic sulfide like chalcopyrite mainly deve-lops in the sericitization zone,and was formed in the medium temperature liquid-rich fluid environment.Molybdenite precipitation is mainly related to boiling and temperature reduction,polymetallic sulfide precipitation like chalcopyrite is mainly caused by temperature reduction and atmospheric water mixing.Comprehensive analysis thinks the copper-molybdenum deposit in the southern Huoluotai AreaⅠis a typical porphyry deposit.

关 键 词：铜钼矿床 成矿流体 流体包裹体 矿床成因 斑岩型矿床 大兴安岭北段 霍洛台Ⅰ区 

分 类 号：TD11[矿业工程—矿山地质测量] P618.41[天文地球—矿床学]