紫金山铜金矿黄铁矿环带结构特征  

Characteristics of zonal pyrite in Zijinshan Cu-Au Deposit

作　　者：张文媛[1] 王翠芝[1] 孙颖超[1] 丘志钊 醋园博[1] 

机构地区：[1]福州大学紫金矿业学院,福州350108

出　　处：《有色金属（矿山部分）》2014年第6期36-42,共7页NONFERROUS METALS(Mining Section）

基　　金：国家自然科学基金(41072067);福建省大学生创新创业训练计划项目(FJ1210386030)

摘　　要：主要通过对紫金山铜金矿成矿期环带状黄铁矿的特征研究,来探讨成矿期地质环境及成矿作用。利用电子探针对不同深度矿化带中具环带结构黄铁矿的内核和环带中的微区进行化学成分分析,发现环带黄铁矿属于亏铁富硫型。Ni-Co(-As)图解显示环带状黄铁矿为火山—热液成因;环带是主要载金部位,金以纳米级自然金颗粒形式存在。结合本矿矿区地质、矿相学、岩石地球化学特征,认为本矿成矿期环带黄铁矿的形成与本区燕山晚期的火山—岩浆侵入活动密切相关,体现紫金山铜金矿的成矿流体是燕山晚期富含Cu、Au、Pb、Zn等成矿元素的火山热液叠加在燕山早期具有W、Sn、Mo、Bi等矿化的紫金山复式花岗岩岩体上。In this paper,the geological environment and mineralization is studied through the characteristics of zonal pyrite at the metallogenic stage in Zijinshan Cu-Au Deposit.Chemical composition analysis indicate that the zonal pyrite is sulfur rich and iron deficiency type by using electron microprobe in the microcells in the core and zones of zonal pyrite in different depth ore belts.The graphs of Ni– Co（-As）display that the zonal pyrite at metallogenic stage belongs to volcanic hydrothermal genesis type.The zonal pyrite is the main gold-located part in which the gold preserved in the nanoscale natural gold particle form.Combining with the ore area geology,ore microscopy,geochemical characteristics,we considered that the zonal pyrite formation in ore metallogenic stage is related to the late Yanshanian volcanic and magma intrusion activities in this area.It presented that the ore-forming fluid is rich in ore elements,such as Cu,Au,Pb,Zn,etc.The volcanic hydrothermal fluid with ore-forming elements is superimposed on the early Yanshanian Zijinshan granite complex rock mass with mineralization element of W,Sn,Mo,Bi,etc.

关 键 词：紫金山铜金矿床 黄铁矿 环带结构 电子探针 金的赋存状态 

分 类 号：P578.292[天文地球—矿物学]