吉林大学学报(地球科学版) ›› 2018, Vol. 48 ›› Issue (4): 1071-1084.doi: 10.13278/j.cnki.jjuese.20170169
李向文1, 张志国2, 王可勇3, 孙加鹏3, 杨吉波1, 杨贺3
Li Xiangwen1, Zhang Zhiguo2, Wang Keyong3, Sun Jiapeng3, Yang Jibo1, Yang He3
摘要: 宝兴沟金矿床是大兴安岭北部上黑龙江成矿带内大型金矿床之一,矿体主要产于下侏罗统二十二站组砂岩与早白垩世石英闪长岩、闪长玢岩内外接触带内,其热液成矿作用可划分为:黄铁矿±毒砂-石英(Ⅰ)、多金属硫化物-石英(Ⅱ)及少硫化物-碳酸盐(Ⅲ)3个阶段。流体包裹体岩相学研究表明:Ⅰ阶段矿石主要发育气液两相(LV)、少量含CO2三相包裹体(HCO2)及富气相包裹体(FV);Ⅱ阶段矿石中主要发育LV及少量HCO2包裹体;Ⅲ阶段矿石中只发育LV包裹体。测温结果显示:Ⅰ、Ⅱ阶段包裹体总体均一温度峰值集中于225.00~300.00℃,盐度(w(NaCl))为2.00%~10.00%;Ⅲ阶段均一温度峰值集中于175.00~225.00℃,盐度为4.00%~8.00%;成矿流体为简单的含CO2中低温、低盐度的NaCl-H2O热液体系,总体具有从成矿早期到晚期均一温度、盐度逐渐降低的特征。氢、氧同位素分析结果显示,Ⅰ、Ⅱ阶段成矿流体δDSMOW为-131.00‰~-108.00‰、δ18OSMOW为1.00‰~4.00‰,Ⅲ阶段δDSMOW为-108.00‰、δ18OSMOW为-1.89‰,表明早期以岩浆水为主,晚期逐渐演化为与大气降水混合热液。矿石中黄铁矿(毒砂)δ34SV-CDT为1.50‰~4.20‰,显示其物质来源以深源岩浆为主。综合分析认为,区内金成矿作用与早白垩世(石英)闪长岩、闪长玢岩侵入活动有直接关系,矿床属中低温岩浆热液成因类型。
中图分类号:
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