摘要
金山金矿床位于西秦岭北成矿亚带中的礼岷金矿带东段,是与秦岭造山带有关的金矿床;主要矿(化)体产于构造蚀变带内的次级层间断层(破碎带)中;主要含矿岩石为蚀变(斑点状)千枚岩,矿石矿物组合主要为毒砂+黄铁矿,与矿化关系密切的蚀变组合为绢云母化+硅化。文章系统地进行了矿区钻孔岩石地球化学测量工作,分析了Au、Ag、Cu、Pb、Zn、As、Sb、Bi、Hg、W、Sn、Mo、Mn、U共14种元素。用相关分析和聚类分析方法研究了元素组合特征,原生晕元素组合特征表明,成矿元素Au与Ag、As、Sb、Hg显著相关,Ag、As尤为显著,是重要的矿化指示元素。通过元素分带对比研究与数理统计,建立了地球化学评价指标,初步预测矿床深部的找矿前景。总体来说,区域性大断裂对与金山金矿床形成密切相关的成矿流体的就位控制作用明显,矿区近EW向构造带及几组构造的交汇叠加部位是成矿的有利地段,这一成矿规律对矿区深部及外围隐伏金矿体的找矿勘查工作具有重要的指导意义。
The Jinshan gold deposit is located in the eastern section of Limin gold ore belt,north sub-ore-zone in West Qinling Mountain.It is generally a gold deposit,which is associated with the Qinling orogenic zone.The major ore(mineralization)bodies are hosted in the secondary layered fault and fracture belts within the structural alteration zone.The main ore-bearing rock is altered(spotted)phyllite,the mineral combination is mainly arsenopyrite+pyrite,and the alteration combination closely related to mineralization is sericitization+silicification.This paper has systematically carried out the geochemical survey of the drilling rocks in the mining area,and analyzed the 14 elements of Au,Ag,Cu,Pb,Zn,As,Sb,Bi,Hg,W,Sn,Mo,Mn,and U.Correlation analysis and cluster analysis methods are used to study the element combination characteristics.The primary halo element combination feature shows that the ore-forming element Au is significantly related to Ag,As,Sb,and Hg,especially Ag and As are the important mineralization indicators.Through the comparative study of element zonation and mathematical statistics,geochemical evaluation index has been established to preliminarily predict the prospecting prospect of the deep deposit.On the whole,the regional large faults have the obvious controlling effect on the ore-forming fluids closely related to the formation of Jinshan gold deposit.The EW structural belt and the intersection parts of several groups of structures in the mining area are favorable areas for gold mineralization.The metallogenic regularity has an important guiding significance for the prospecting and exploration of concealed gold orebodies in the deep and peripheral areas of Jinshan mining area.
作者
赖晓丹
LAI Xiaodan(Zijin Mining Group Co.,Ltd.,Xiamen 361000,Fujian,China)
出处
《矿产与地质》
2021年第4期748-762,共15页
Mineral Resources and Geology
基金
国家重点研发计划项目“穿透性地球化学勘查技术”(编号:2016YFC0600608)资助。
关键词
金山金矿床
原生晕
地球化学特征
元素组合特征
找矿预测
甘肃礼县
Jinshan gold deposit
primary halo
geochemical characteristics
element combination characteristics
prospecting and prediction
Lixian of Gansu
