摘要
新疆阿尔泰阿舍勒铜锌矿床位于阿舍勒盆地,矿体赋存于中-下泥盆统阿舍勒组海相火山-沉积岩系中,为典型的VMS型矿床。Ⅰ号矿化带主矿体为铜-锌矿体,呈似层状产于凝灰岩与玄武岩之间,补给通道相细脉-网脉状铜矿化。Ⅱ号矿化带产于凝灰岩中,上部为层状重晶石矿化,补给通道相为细脉-网脉状铜铅锌银矿化。文章对脉状矿化中黄铁矿、闪锌矿、黄铜矿、方铅矿、黝铜矿、辉碲铋和绿泥石进行了矿物学研究,电子探针分析表明,硫化物主成分含量接近其理论含量。黄铁矿中w(Fe)/w(S+As)比值平均为0.874,暗示脉状矿化形成深度为中浅部。闪锌矿中w(Fe)较低,指示其在低温环境下形成。绿泥石为蠕绿泥石,形成温度为157~206℃,平均为190℃。黝铜矿普遍含Zn,可达到8%,Ⅰ号矿化带黝铜矿富砷,Ⅱ号矿化带富锑,指示Ⅱ号矿化带矿物形成时的温度相对Ⅰ号矿化带低。脉状矿体中Au主要赋存于黄铁矿、黄铜矿、黝铜矿和闪锌矿中,Ag主要赋存在黝铜矿中,可达2.365%,Se主要赋存在辉碲铋矿中,平均1.242%。脉状矿化的矿物在中、低温度,较高硫逸度的环境下形成。矿体从底部到上部硫逸度总体趋势降低并且层状矿体和脉状矿体为同期同源热液活动的产物。
The Ashele copper-zinc deposit is located in the Ashele Basin in Xinjiang Altay,and is a typical example of VMS-type deposit that hosted in the marine volcano-sedimentary rocks belonging to the Lower-Middle Devonian Ashele Formation.The main Cu-Zn orebody of the No.Ⅰmineralization zone,occurs as stratiform mineralization between tuff and basalt units and consists of an upper stratiform Cu-Zn orebodies and lower veinlet and stockwork pipe-style Cu orebody.The No.Ⅱmineralization zone is hosted in tuff units and consists of an upper stratiform barite orebody and lower veinlet and stockwork pipe-style Cu-Pb-Zn-Ag orebodies.In this paper,the main chemical elements of the pyrite,sphalerite,chalcopyrite,galena,tetrahedrite,tetradymite,and chlorite in vein-type mineralization were analyzed by electron microprobe.The main component contents of sulfides are close to their theoretical contents.The Fe/(S+As)ratios show an average of 0.874 in the pyrite,indicating that the sulfides from vein-type orebodies were formed in a medium-shallow depth.The low Fe content in sphalerite indicates its low formation temperature.The analysis of chlorite shows that it belongs to prochlorite.The formation temperatures of chlorite are between 157~206℃(with an average of 190℃).Tetrahedrite generally contains Zn with its content reaching 8%.The elemental content of tetrahedrite indicates that the No.Ⅰmineralization zone is rich in As while the No.Ⅱmineralization zone is rich in Sb,reflecting that the formation temperature of the minerals in the No.Ⅱmineralization zone is lower than that of the No.Ⅰmineralization zone.Au is present mainly in pyrite,chalcopyrite,tetrahedrite,and sphalerite,Ag is present mainly in tetrahedrite(up to 2.365%),and Se is present mainly in tetradymite(with an average of 1.242%)in veined ore bodies.The vein-type minerals are formed in medium and low temperature,high sulfur fugacity environment.From the bottom to the upper part,the overall trend of sulfur fugacity of the orebody decreases,and the layered
作者
张振龙
杨富全
李强
杨成栋
ZHANG ZhenLong;YANG FuQuan;LI Qiang;YANG ChengDong(MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China;School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,Anhui,China)
出处
《矿床地质》
CAS
CSCD
北大核心
2020年第5期905-925,共21页
Mineral Deposits
基金
国家重点研发计划(编号:2017YFC0601201)
“十二五”国家科技支撑计划项目(编号:2011BAB06B03-02)联合资助。
关键词
地球化学
VMS型矿床
脉状矿化
电子探针分析
阿舍勒铜锌矿
阿尔泰
新疆
geochemistry
VMS deposits
vein-type mineralization
electron microprobe analysis
Ashele Cu-Zn deposit
Altay
Xinjiang
