黑龙江省黑河市五道沟地区金矿化特征及矿床成因  

Characteristics and deposit genesis of gold mineralization in Wudaogou area,Heihe City,Heilongjiang Province

作　　者：张浩文 王可勇[1] 马万里 孙清飞 赵晨光 Zhang Haowen;Wang Keyong;Ma Wanli;Sun Qingfei;Zhao Chenguang(College of Earth Sciences,Jilin University)

机构地区：[1]吉林大学地球科学学院,130061

出　　处：《黄金》2021年第12期13-19,共7页Gold

基　　金：东北亚矿产资源评价自然资源部重点实验室开放基金项目(DBY-ZZ-18-12);中国地质调查局中国科学技术部项目(2017YFC0601304)。

摘　　要：五道沟地区地处中亚造山带东部,黑河-贺根山断裂西北部,构造、岩浆活动强烈,主要发育印支期侵入体和2组北东向断裂,为金矿化提供了有利的地质条件。该地区金矿化以石英脉型为主,成矿作用可分为石英-黄铁矿-自然金阶段(Ⅰ)、石英-黄铁矿-黄铜矿-闪锌矿阶段(Ⅱ)、方解石-贫硫化物阶段(Ⅲ)3个阶段,且伴随绿泥石化和绢云母化蚀变。流体包裹体研究结果表明:主要发育气液两相包裹体(L型)、含CO_(2)包裹体(C型)和富气相包裹体(V型)3种类型包裹体;成矿Ⅰ、Ⅱ、Ⅲ阶段由中高温、中等盐度的CO_(2)-NaCl-H_(2)O体系逐渐演化为低温、低盐度的NaCl-H_(2)O体系,期间压力骤降引发的流体沸腾作用是金属矿物沉淀的主要原因。氢-氧同位素测试结果表明:δD_(V-SMOW)与δ^(18)O H_(2)O分别为-128.5‰~-99.6‰和-2.3‰~6.5‰,暗示成矿流体主要来源于岩浆水,同时伴随少量的大气降水混入。Wudaogou area is located in the eastern section of the Central Asian orogenic belt,and the northwestern section of Heihe-Hegenshan fault.There are intense structural and magmatic activities in the area and develop Indosinian intrusions and_(2)groups of NE-trending faults,which are favorable geologic conditions for gold mineralization.The gold mineralization in the area is dominated by quartz veins,and the mineralization can be divided into quartz-pyrite-gold stage(Ⅰ),quartz-pyrite-chaloopyrite-sphalerite stage(Ⅱ),and calcite-poor sulfide stage(Ⅲ);and associated with the alteration of chloritization and sericitization.Research on fluid inclusions shows that there are 3 types of fluid inclusions:gas-liquid two-phase inclusions(L-type),CO_(2)-containing inclusions(C-type),and gas-rich inclusions(V-type).TheⅠ,ⅡandⅢstages of mineralization gradually evolved from the CO_(2)-NaCl-H_(2)O system with medium high temperature and medium salinity to the NaCl-H_(2)O system with low temperature and low salinity.The boiling of the fluids mainly caused by the sudden pressure drop during this period leads to the precipitation of metallic minerals.The H-O isotope test results show that the ranges ofδD V-SMOW andδ^(18)O H_(2)O are-128.5‰--99.6‰and-2.3‰-6.5‰,respectively,implying that the ore-forming fluid mainly derives from magmatic water and mixes with a small amount of atmospheric precipitation.

关 键 词：金矿化特征 热液脉型金矿化 流体包裹体 五道沟地区 黑龙江省 

分 类 号：TD11[矿业工程—矿山地质测量] P618.51[天文地球—矿床学]