山东栖霞大河崖金矿床包裹体特征研究及矿床成因初探  

Inclusion characteristics and genesis of Daheya gold deposit in Qixia,Shandong Province

作　　者：智云宝[1,2] 侯广顺 郝兴中[1,2] 孙聪聪[4] 刘汉栋 张春池 李凤春[5] ZHI Yunbao;HOU Guangshun;HAO Xinzhong;SUN Congcong;LIU Handong;ZHANG Chunchi;LI Fengchun(Shandong Institute of Geological Survey,Jinan 250014,Shandong,China;Shandong Engineering Research Center of Land Quality Geochemistry and Pollution Prevention,Jinan 250014,Shandong,China;Institute of Resources&Environment,Henan Polytechnic University,Jiaozuo 454000,Henan,China;Institute of Geology and Mineral Resources of Shandong Province,Jinan 250100,Shandong,China;The Testing Center of Shandong Bureau of China Metallurgical Geology Bureau,Jinan 250014,Shandong,China)

机构地区：[1]山东省地质调查院,山东济南250014 [2]山东省土地质量地球化学与污染防治工程技术研究中心,山东济南250014 [3]河南理工大学资源环境学院,河南焦作454000 [4]山东省第一地质矿产勘查院,山东济南250100 [5]中国冶金地质总局山东局测试中心,山东济南250013

出　　处：《矿产勘查》2024年第2期212-222,共11页Mineral Exploration

基　　金：中国地质调查局项目(121201004000150017-60);山东省地质勘查项目(鲁勘字(2021)2号);国家自然科学基金项目(41773024)联合资助。

摘　　要：大河崖金矿床地处华北克拉通南缘的胶辽隆起区,栖霞—蓬莱金成矿带上,其空间产出受台前—陡崖断裂带和岩浆活动制约。为研究该矿床成矿流体特征及矿床成因,本文对其开展不同阶段的包裹体进行岩相学、显微测温、包裹体激光拉曼及S同位素分析。测试结果表明,包裹体可划分为Ⅰ型富液气液两相盐水包裹体、Ⅱ型含CO_(2)三相包裹体和Ⅲ型纯液相包裹体3类,矿石中的包裹体类型以气液二相包裹体和含CO_(2)三相包裹体为主。成矿期流体完全均一温度变化范围为216~298℃,盐度为3.71%~9.98%NaCleqv,密度为0.80~0.90 g/cm^(3)。成矿晚期流体完全均一温度变化范围为124~181℃,盐度2.41%~5.56%,密度0.91~0.98 g/cm^(3)。表明该矿床属于中低温、中低盐度、低密度的热液脉型矿床。从主成矿期(Ⅱ和Ⅲ阶段)到成矿晚期(Ⅳ阶段),成矿温度和盐度降低,成矿密度略有升高。矿石中黄铁矿δ^(34)S变化范围为+5.1‰~+6.51‰,与栖霞—蓬莱金成矿带其他金矿床基本一致。显示主要为岩浆硫,成矿物质可能来源于深部岩浆。根据流体包裹体及同位素研究并结合区域地质特征,大河崖金矿床的成矿与白垩世岩浆关系密切,受台前—陡崖断裂带控制,在其次级断裂形成沉淀富集成矿。Daheya gold deposit is located on the Qixia-Penglai gold metallogenic belt in Jiaoliao uplift area of the southern margin of North China Craton.Its spatial occurrence was controlled by the NE-trending Taiqian-Douya Fault and the Early Cretaceous magmatic activities in the region.In order to study the characteristics of ore-forming fluid and ore genesis.Petrography,microthermometry,laser Raman spectroscopy and S isotope analysis of inclu⁃sions in different stages of the deposit are studied.The results indicate that there are three types of fluid inclusions including two-phrase aqueous fluid inclusions(Ⅰ),CO_(2)-bearing fluid inclusions(Ⅱ)and liquid inclusions(Ⅲ),the main types are two-phrase aqueous fluid inclusions and CO_(2)-bearing fluid inclusions.The homogenization temperatures between 216-298℃,with salinity and densities concentrates at 3.71%-9.98%NaCleqv and 0.80-0.90 g/cm^(3) in the main metallogenic stages.The homogenization temperatures between 124-181℃,with salin⁃ity and densities concentrates at 2.41%-5.56%NaCleqv and 0.91-0.98 g/cm^(3) in the main metallogenic stages.The metallogenic temperature and salinity decreased and the metallogenic density increased slightly from the main metallogenic period(ⅡandⅢ)to the late metallogenic period(Ⅳ).These results indicate that the quartz veins of the Daheya gold deposit belong to the hydrothermal vein type deposit with medium-low temperature,medium-low salinity and low density.The values ofδ^(34)S are+5.1‰-+6.51‰,it is basically consistent with other gold deposits in Qixia-Penglai gold metallogenic belt,It shows that it is mainly magmatic sulfur,and the ore-forming fluid may come from deep magma.Based on fluid inclusions,isotope data studies and regional geological characteristics,the mineralization of daheya gold deposit is closely related to the cretaceous magma,the deposit is controlled by the Taiqian-Douya Fault,precipitation enrichment and mineralization are formed in its secondary faults.

关 键 词：大河崖金矿床 流体包裹体 S同位素 矿床成因 胶东 

分 类 号：P588.12[天文地球—岩石学] P595[天文地球—地质学] P597