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黔东八克金矿床毒砂和黄铁矿微量元素地球化学研究
引用本文:郑杰,余大龙,杨忠琴.黔东八克金矿床毒砂和黄铁矿微量元素地球化学研究[J].矿物学报,2010,30(1).
作者姓名:郑杰  余大龙  杨忠琴
作者单位:1. 中国冶金地质总局矿产资源研究院,北京,100025
2. 贵州大学资源与环境工程学院,贵州,贵阳,550003
3. 贵州省地质调查院,贵州,贵阳,550000
摘    要:八克金矿床以矿体和围岩广泛出现毒砂为典型特征,毒砂、黄铁矿为金的主要共生矿物。对矿体及其围岩中毒砂、黄铁矿进行稀土和微量元素地球化学研究,结果显示矿体中毒砂和黄铁矿的稀土元素总量明显低于围岩的毒砂、黄铁矿,从矿体—近矿围岩—远矿围岩,毒砂、黄铁矿都出现铕的明显负异常,铈无明显异常,反映成矿流体具弱还原性;毒砂、黄铁矿微量元素含量呈现出随着成矿流体从早期到晚期的演化而减少,并普遍亏损高场强元素,富集LREE的特征;通过对黄铁矿、毒砂Hf/Sm、Nb/La和Th/La比值分析,表明八克金矿床成矿流体为富Cl型流体;从研究毒砂、黄铁矿Y/Ho、Zr/Hf和Nb/Ta比值变化范围,表明作用于围岩、矿体中的成矿流体从早期-晚期发生了改变,推测晚期成矿流体可能遭受了外来热液的混入;应用毒砂、黄铁矿中的Co/Ni比值,结合已有数据,表明成矿热液具有多来源的特点,成矿流体来源于大气降水与岩浆水不均匀混合。八克金矿是岩浆热液型的含金石英脉型金矿床。

关 键 词:毒砂  黄铁矿  微量元素  八克金矿  黔东  

A Study on the Trace Element Geochemical Characteristics of Pyrite and Arsenopyrite in Bake Gold Deposit,East Guizhou Province, P.R.China
ZHENG Jie,YU Da-long,YANG Zhong-qin.A Study on the Trace Element Geochemical Characteristics of Pyrite and Arsenopyrite in Bake Gold Deposit,East Guizhou Province, P.R.China[J].Acta Mineralogica Sinica,2010,30(1).
Authors:ZHENG Jie  YU Da-long  YANG Zhong-qin
Institution:1.Institute of Mineral Resources Research/a>;China Metallurgical Geology Bureau/a>;Beijing 100025/a>;China/a>;2.Department of Resources and Environment Engineering/a>;Guizhou University/a>;Guiyang 550003/a>;3.Guizhou Academy of Geologic Survey/a>;Guiyang 550000/a>;China
Abstract:In Bake gold deposit,arsenopyrite is regarded as extensive orebody and typical country rocks.Arsenopyrite and pyrite are the main symbiotic gold minerals.In this study,based on rare earth elements and trace elemental analysis of pyrite and arsenopyrite,sources and characteristics of ore-forming fluids in the Bake gold deposit were studied.The result indicated that REE in pyrite and arsenopyrite was obviously lower than in the total amount of the country rock,and δEu value was between 0.538~0.657,showing a clear negative anomaly.The ore-forming fluid had weak reducibility.Race elements of arsenopyrite and pyrite were reduced by ore-forming fluid with the evolution.There were relatively high LREE and low HREE.Ratios of Hf/Sm,Nb/La,and Th/La showed that the ore-forming fluid were rich Cl-type fluid.Ratios of Y/Ho,Zr/Hf,and Nb/Ta indicated the changes of the country rock and ore body in the ore-forming fluids.The later ore-forming hydrothermal fluids might be subjected to the mixture of foreign.Application of Co/Ni ratios of arsenopyrite and pyrite,combined with available data,indicated that with multiple sources of ore-forming hydrothermal features,ore-forming fluids derived from the mixture of meteoric water and magmatic water.Bake gold deposit is magmatic hydrothermal gold-bearing quartz vein type gold deposit.
Keywords:arsenopyrite  pyrite  trace element  Bake gold deposit  East of Guizhou Province  China  
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