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现代地质 ›› 2014, Vol. 28 ›› Issue (1): 73-86.

• 岩石学与矿床学 • 上一篇    下一篇

内蒙古边家大院铅锌银多金属矿床的矿物组成及其成因意义

王喜龙1,刘家军1,翟德高1,杨永强1,王建平1,张琪彬1,张安立2,李彦林3,王晓亮1,杨增海1   

  1. (1地质过程与矿产资源国家重点实验室,中国地质大学(北京)地球科学与资源学院,北京100083;
    2赤峰市利拓矿业有限公司,内蒙古 赤峰024000;3内蒙古自治区核工业二四三大队,内蒙古 赤峰024000)
  • 出版日期:2014-02-20 发布日期:2014-02-23
  • 作者简介:王喜龙,男,硕士研究生,1988年出生,矿物学、岩石学、矿床学专业,主要从事矿床学与矿床地球化学的研究。Email:546737333@qq.com。
  • 基金资助:

    中国地质调查局地质矿产调查评价专项“覆盖区矿产综合预测”(1212011085471);国家自然科学基金项目(40973035, 41072070, 41272110);高等学校学科创新引智计划(B07011)。

Mineral Composition of Bianjiadayuan Pb-Zn-Ag Polymetallic Deposit in Inner Mongolia and Its Origin Significance

WANG Xi-long1, LIU Jia-jun1, ZHAI De-gao1, YANG Yong-qiang1, WANG Jian-ping1, ZHANG Qi-bin1, ZHANG An-li2, LI Yan-lin3, WANG Xiao-liang1, YANG Zeng-hai1   

  1. (1 State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences and Resources, China University of Geosciences,
    Beijing100083, China;2 Lituo Mining Industry Group of Chifeng, Chifeng, Inner Mongolia024000,China;
    3243 Brigade of Inner Mongolia Nuclear Geology, Chifeng, Inner Mongolia024000,China)
  • Online:2014-02-20 Published:2014-02-23

摘要:

边家大院铅锌银多金属矿床位于大兴安岭成矿带中南段,是近几年来新发现的矿石品位较高的铅锌银多金属矿床。详细的显微镜下鉴定及电子探针分析表明,矿床的金属矿物主要为方铅矿、闪锌矿、黄铁矿、黄铜矿、磁黄铁矿、毒砂、黝锡矿等,含银的矿物主要为银锑黝铜矿、黝锑银矿及深红银矿。此外,矿区还发现大量针硫锑铅矿,与其共生金属矿物主要为方铅矿、黄铜矿、黝锑银矿等。针硫锑铅矿主要呈长柱状、针状、束状和不规则粒状等,粒度变化较大,一般为5~150 μm。电子探针分析结果表明,其相应的平均化学分子式为(Pb4.77Cu0.05Fe0.04Zn0.06)4.92Sb3.91S11.00,简写为Pb5Sb4S11。针硫锑铅矿一般是成矿晚期低温作用的产物,边家大院铅锌银多金属矿床中针硫锑铅矿的形成,与成矿温度较低、硫逸度升高以及还原作用等密切相关。

关键词: 边家大院, 铅锌银多金属矿床, 矿物组成, 针硫锑铅矿, 银的赋存状态, 内蒙古

Abstract:

Located in the southern Daxinganling metallogenic belt,Bianjiadayuan Pb-Zn-Ag deposit is a new  discovery in recent years of higher ore grade lead-zinc-silver polymetallic deposit. Detailed microscopic identification and electron analysis show that metalliferous minerals of this deposit mainly consist of galena,sphalerite,pyrite,chalcopyrite,pyrrhotite,arsenopyrite and stannine. Silver minerals mainly consist of tetrahedrite,freibergite and pyrrhotite. In addition,we also found a large number of falkmanites in the mine,which are intimately accompanied by galena,chalcopyrite and tetrahedrite. Falkmanite crystals show as needle,pillar,bunchiness and anhedral grain forms,and their grain sizes commonly vary from 5 to 150 μm.Electron microprobe analysis also shows that its corresponding formula is(Pb4.77Cu0.05Fe0.04Zn0.06)4.92Sb3.91S11.00,and its simplified formula isPb5Sb4S11.Falkmanite is generally the product of the late mineralization with a low tempreture. The formation of falkmanite may be favored by a low temperature,increasing fS2 and reduced fluid conditions in the ore-forming process.

Key words: Bianjiadayuan, Pb-Zn-Ag polymetallic deposit, mineral composition, falkmanite, occurrence of silver, Inner Mongolia

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