胶东三山岛北部海域金矿床成因:地质特征与流体包裹体的制约  

The genesis of the Haiyu gold deposit in the northern part of Sanshandao gold metallogenic belt in the eastern Shandong:Constraints from geological characteristics and fluid inclusion study

作　　者：吕婧祎 王金辉[1] 毛美桥 张文[1] 王英鹏[1] 于晓卫[1] 王立功[1] 张贵丽[1] LYU Jing-yi;WANG Jin-hui;MAO Mei-qiao;ZHANG Wen;WANG Ying-peng;YU Xiao-wei;WANG Li-gong;ZHANG Gui-li(Shandong Institute of Geological Survey,Jinan 250014,China;China Communications Information Technology Group Co.,Ltd,Beijing 100088,China)

机构地区：[1]山东省地质调查院,山东济南250014 [2]中国交通信息科技集团有限公司,北京100088

出　　处：《矿物学报》2023年第4期521-532,共12页Acta Mineralogica Sinica

基　　金：国家重点研发计划重点专项项目(编号:2016YFC0600100);地质矿产调查专项项目(编号:12120113060400);鲁堪字(2021)18号;鲁矿保(2020)1号;鲁勘字(2020)1号。

摘　　要：胶东金矿集区是我国最重要的黄金生产基地。海域金矿床位于三山岛金矿带的北段,是近年来胶东地区新发现的超大型金矿床。有关该矿床成矿流体来源、性质和演化过程仍不清晰。该矿床成矿阶段可划分为成矿早阶段、成矿主阶段和成矿晚阶段,金成矿主要发生在主阶段,早阶段有少量金矿化。流体包裹体主要包括3种类型:H_(2)O-CO_(2)包裹体、富CO_(2)包裹体和水溶液包裹体。早阶段和主阶段均含有3种类型的流体包裹体,而晚阶段只有H_(2)O-CO_(2)包裹体。3个阶段流体包裹体均一温度分别为310.9~360.5℃、291.3~334.1℃和278.3~312.6℃,盐度(NaCleq)分别为1.2%~18.0%、0.8%~18.3%和9.1%~18.0%,成矿流体具有中温、中低盐度、中酸性、富含碳质的特征,流体不混溶在早阶段和主阶段普遍存在,金沉淀主要源于水岩反应和流体不混溶。The Jiaodong gold deposit concentration area is the most important gold production base in China.The Haiyu gold deposit,located in the northern section of the Sanshandao gold metallogenic belt,is a newly discovered world-class gold deposit in the Jiaodong area in recent years.The source,nature and evolution process of the ore-forming fluid in this deposit are still unclear.Through petrographic observation,three metallogenic stages inclding the early metallogenic stage,the main metallogenic stage and the late metallogenic stage have been classified.Gold mineralization mainly occurred in the main metallogenic stage,and a small amount of gold mineralization occurred in the early metallogenic stage.Three types of fluid inclusions including the H2O-CO_(2)inclusion,CO_(2)-rich inclusion and aqueous solution inclusion have been identified.Three types of fluid inclusions are observed in host minerals of both the early and the main metallogenic stages,while only the HO-CO_(2)inclusion has been observed in host minerals of the late metallogenic stage.The fluid inclusions of the early,main and late metallogenic stages have homogenization temperatures of 310.9-360.5℃,291.3-334.1℃ and 278.3-312.6 C,respectively,and salinities of 1.2%-18.0%,0.8%-18.3%and 9.1%-18.0%(wt.%NaCI),respectively.Ore-forming fluids are characterized with medium-temperature,medium-low salinity,medium-acidic,and carbonaceous-rich properties.The fluid immiscibility generally occurred in the early and main stages.The gold precipitation was mainly resulted from the water-rock reaction and fluid immiscibility.

关 键 词：海域金矿床 成矿流体 流体包裹体 氢氧同位素 

分 类 号：P579[天文地球—矿物学] P618.5101[天文地球—地质学]