山东招远前孙家金矿床地质和元素地球化学研究  

Study on geology and element geochemistry of Qiansunjia gold mine in Zhaoyuan,Shandong,eastern China

作　　者：钱建平[1] 陈宏毅[1] 孙涛[1] 刘纯[1] 白艳萍[1] 

机构地区：[1]桂林理工大学地球科学学院,广西桂林541004

出　　处：《地球化学》2010年第3期213-228,共16页Geochimica

基　　金：中国科学院地球化学研究所矿床地球化学国家重点实验室开放基金(200913);有色及贵金属隐伏矿床勘查教育部工程研究中心和广西地质工程中心重点实验室基金资助项目

摘　　要：对矿区地表和井下四个中段共采集地层、岩体、蚀变岩、石英脉和矿体样品503件,测试了Au、Ag、As、Sb、Cu、Pb、Zn、Sn、Bi、Mo、Co、Ni、Mn、Cr、V、Ti、Ba、Rb和Sr等19种元素的含量,运用Suffer软件编制了19种元素的矿脉地球化学纵剖面图,根据格里戈良分带指数法计算了元素的地球化学分带,建立了原生晕地球化学立体分带模式。综合地质地球化学资料分析得出以下认识:由花岗岩→钾长石化花岗岩→绢英岩化花岗岩→绢英岩→石英脉或硅化带→金矿石,随着蚀变作用增强,成矿元素Au、Ag、As、Cu、Pb、Bi、Mo、Sb增加,然而成矿作用主要发生在绢英岩化后的硅化阶段。矿区成矿元素Au、Ag、As、Cu、Pb、Sn、Bi、Mo、Co、Ni含量呈多峰分布,分布范围大,离散度大,其中Au、Ag高含量峰值区峰型突出,成矿富集趋势强烈。矿区成矿阶段可分为:石英-金-黄铁矿阶段、石英-金-多金属硫化物阶段和石英-碳酸盐阶段。F1因子(Au、Ag、As、Co、Ni、Sn、Bi)为主成矿阶段的元素组合,F3因子(Mo、Sb)和F5因子(Cu、Zn)反映了成矿热液活动的多期叠加。F4因子Rb、Sr、Ba组合在本区最具典型意义,Rb与Sr、Ba为对抗性元素,Sr、Ba、Ca低值带,Rb、K高值带恰好与Au、Ag高值带吻合,显示花岗岩长石类矿物的钾长石化和绢云母化与成矿关系密切。与矿体的侧伏方向一致,总体上矿脉纵剖面地球化学高值带均向SW侧伏。其中Au、Ag高值带宽且比较连续,上下均未封闭,结合金矿体虽已出露地表但规模不大和原生晕分带特征,推测为一浅剥蚀矿床,向SW深部仍有一定延深。矿区原生晕分带序列自上而下为(Hg2、Sr、Ba、Rb)→(Ag、Au、Sn、Mo、Cu)→(Zn、Pb)→(Sb、Mn)→(Ni、V、Co、As、Hg1、Bi)。As、Sb、Hg高值带偏于中下部,可能指示下部隐伏矿体的存在。The concentrations of 19 trace elements （Au, Ag, As, Sb, Cu, Pb, Zn, Sn, Bi, Mo, Co, Ni, Mn, Cr, V, Ti, Ba, Rb and Sr） were determined for 503 samples collected from the surface and four sections of underground mine in Qiansunjia gold deposit, ranging from metamorphic rocks, granites, altered rocks, quartz vein and orebody. Mining vein geochemical profiles of all 19 elements were compiled using Suffer software. Geochemical zoning was calculated following the Gregorian＇s zoning index calculation method. Based on these calculations, a three-dimensional zonation pattern of the primary halo was established. Geological and geochemical date show that the concentrations of metallogenic elements, i.e. Au, Ag, As, Cu, Pb, Bi, Mo, Sb, increase with increasing aheration, in the order of granite → potash feldspathization granite → sericite-quartz alteration granite sericite-quartz rock → quartz vein or silicified zones → gold ore. Nonetheless, the metallogenic activity mainly occurred in the silicified period after sericite-quartz aheration. The distribution of metallogenic elements, e. g., Au, Ag, As, Cu, Pb, Sn, B, Mo, Co, Ni, is discrete, covering a large range with muhi-peaks. Gold and Ag have high concentration peaks with dramatic metallogenic enrichment. Three metallogenic stages have been identified： quartz-gold-pyrite, quartz-gold-muhi-metal sulfide and quartz-carbonate. F1 factor （ku, Ag, As, Co, Ni, Sn, Bi） is the element combination of the main metallogenic period. F3 factor （Mo, Sb） and F5 factor （Cu, Zn） reflect multi-period of metallogenic hydrothermal activities. The F4 factor （Rb, Sr, Ba） has an important representative significance： the distributions of Rb and Sr, Ba are antagonized. The low value zones of Sr, Ba and Ca, and correspondingly high value zone of Rb and K, are coincident with the high value zone of Au and Ag, which indicates that the potash feldspathization and sericite alteration of feldspar minerals in the granite are important to mineralization. Geochemical p

关 键 词：金矿 地球化学参数 元素分布型式 元素组合 原生晕地球化学分带 胶东 

分 类 号：P595[天文地球—地球化学] P632[天文地球—地质学]