胶东金地球化学背景研究  

Study on Geochemical Background Field of the Gold Deposits in Jiaodong,China

作　　者：陈玉民[1] 曾庆栋[2,3,4] 孙之夫 王昭坤 范宏瑞 肖风利[1] 褚少雄 CHEN Yumin;ZENG Qingdong;SUN Zhifu;WANG Zhaokun;FAN Hongrui;XIAOFengli;CHU Shaoxiong(Shandong Gold Group Co.,Ltd.,Jinan 250101,Shandong,China;Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;Innovation Academy of Earth Science,Chinese Academy of Sciences,Beijing 100029,China;College of Earth Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Shandong Gold Geology and Mineral Exploration Co.,Ltd.,Laizhou 261400,Shandong,China)

机构地区：[1]山东黄金集团有限公司,山东济南250101 [2]中国科学院地质与地球物理研究所,中国科学院矿产资源研究重点实验室,北京100029 [3]中国科学院地球科学研究院,北京100029 [4]中国科学院大学地球科学学院,北京100049 [5]山东黄金地质矿产勘查有限公司,山东莱州261400

出　　处：《黄金科学技术》2019年第6期791-801,共11页Gold Science and Technology

基　　金：国家重点研发计划项目“华北克拉通成矿系统的深部过程与成矿机理”（编号：2016YFC0600100）;山东黄金集团有限公司科研（深钻）项目联合资助

摘　　要：胶东金矿集区形成于早白垩世构造体制转折期,具有大规模爆发成矿特征,是世界上重要的金矿集中区之一。针对胶东金矿集区成矿物质来源这一科学问题,采用Au元素地球化学分析法系统分析该区地表和深钻样品,揭示该区金的地球化学背景特征,为探讨该区Au元素高强度巨量堆积的成矿作用机制提供地球化学场制约。结果显示:地表胶东群变质岩具有中部高(金丰度均值为1.35×10^-9)、东部及西部低(金丰度均值分别为0.95×10^-9和0.76×10^-9)的地球化学背景场特征;深钻岩石样品的金丰度均值均低于大陆地壳克拉克值及华北地台大陆地壳的金丰度平均值,同样显示亏损地球化学背景场特征。因此,在胶东金矿集区存在金的地球化学亏损场,结合矿区内围岩中普遍存在的热液活动迹象,认为胶东群和中生代花岗岩可能为胶东金矿的形成提供了部分成矿物质。Jiaodong gold ore-concentrating area is the third largest gold mining area in the world after the Lande gold mining area in South Africa and Muruntau gold mining area in Uzbekistan,and its proved gold resources exceed 4500 t.Jiaodong gold ore-concentrating area formed in the Early Cretaceous tectonic regime transition period and has the characteristics of large-scale concentrated mineralization.This area is composed of a lot of super-large,large gold deposits and includes altered rock type,quartz vein type and interlayer fracture zone type gold deposit.The typical altered rock type gold deposits are Sanshandao,Jiaojia,Xincheng Dayingezhuang,Xiadian and Dongfeng 171 deposits,and so on.The quartz vein type gold deposits include Linglong,Jinqingding and Denggezhuang deposits,and so on.The interlayer fracture zone type gold deposits are represented by the Pengjiakuang gold deposit.These gold deposits are mainly controlled by the regional faults,secondary faults and interlayer slide faults along the northern margin of the Laiyang basin.The gold deposits in Jiaodong mainly occur within the Mesozoic granite,minor whthin Jiaodong Group,Jingshan Group and Mesozoic strata.This paper selects the scientific problem of the source of ore-forming materials,and systematically analyzes the surface and deep-drilling samples sampled from the Jiaodong area by means of Au element geochemical analysis,in order to reveal the geochemical background characteristics of Au element in this area,and provides geochemical field constraints for discussing the metallogenic mechanism of highintensity massive accumulation of Au element in this area.The results show that the average abundance of Au element(1.10×10^-9)of the Jiaodong group is lower than that of Clark value of continental crust(1.21×10^-9)and the value of continental crust of North China Platform,which shows the characteristic of gold deficit geochemical field.Moreover,the results also show that the gold geochemical background feild of the Jiaodong group is characterized by higher

关 键 词：地球化学背景场 金丰度 物质来源 金矿集区 深钻样品 胶东 

分 类 号：P618.51[天文地球—矿床学]