西藏斯弄多浅成低温热液型银铅锌矿床银的赋存状态研究
投稿时间:2017-04-29  修订日期:2017-06-28  点此下载全文
引用本文:
DOI:
摘要点击次数: 23
全文下载次数: 
作者单位E-mail
李壮 中国地质科学院矿产资源研究所 lizhuangcags@126.com 
唐菊兴 中国地质科学院矿产资源研究所 tangjuxing@126.com 
丁帅 成都理工大学  
李海峰 中国地质大学(北京)  
杨宗耀 成都理工大学  
施硕 成都理工大学  
王立强 中国地质科学院矿产资源研究所  
李于海 西藏中瑞矿业发展有限责任公司  
基金项目:国家自然科学基金项目(编号:41403040)和西藏中瑞矿业发展有限责任公司项目(编号:XZZR-2015)
中文摘要:斯弄多银铅锌矿床是冈底斯成矿带林子宗群火山岩中发现的首例低硫化型浅成低温热液型中-大型多金属矿床。矿区矿物组合多样,矿石组构复杂,具有热液成矿作用的典型特征,成矿阶段可划分为(I)闪锌矿-黄铜矿-硫砷铜矿-黄铁矿-石英阶段、(II)方铅矿-闪锌矿-银矿物阶段、(III)黄铁矿-石英-方解石三个成矿阶段。通过野外调查、地质编录、显微观察和电子探针(EPMA)微区分析,本文对该矿床中银的赋存状态进行了详细的研究。结果表明,银主要以独立银矿物形式存在,方铅矿、闪锌矿、黄铁矿、黄铜矿等金属矿物中不可见银极少。银矿物种类主要为硫砷铜银矿、辉银矿、深红银矿、螺状硫银矿和自然银,呈裂隙银或粒间银形式赋存于矿区碧玉、铁锰碳酸盐和早期金属硫化物中,次以包裹银形式赋存于早期硫化物中。另,在硫砷铜矿中发育极少的类质同象不可见银。银矿化主要形成于成矿阶段II,银主要以硫的络合物形式运移,随着成矿流体物理化学条件的变化而发生沉淀,形成银矿物。
中文关键词:赋存状态  银矿物  浅成低温热液型矿床  林子宗群  斯弄多
 
Study on the Occurrence of Silver in the Sinongduo Epithermal Ag-Pb-Zn deposit, Tibet
Abstract:The Sinongduo Ag-Pb-Zn deposit is the first discovered medium-large scale low-sulfidation hydrothermal deposit in the Linzizong volcanic rock of the Gangdese metallogenic belt. There are various mineral assemblages and structures, and this deposit has the typical characteristics of hydrothermal mineralization. The periods of the mineralization in this deposit can be mainly divided into three stages: (I) sphalerite-chalcopyrite-enargite-pyrite-quartz stage, (II) galena-sphalerite-silver mineral stage, (III) pyrite-quartz-calcite. Through the field investigation, geological logging, microscopic observation and the electron microprobe analyse (EPMA), this paper have studied the occurrence of the silver in Sinongduo deposit. The results acquired have shown that the silver primarily exists in the form of independent silver minerals. However, the other sulfides just have merely silver, such as the sphalerite, galena, pyrite and chalcopyrite. The silver minerals mainly include peaceite, argentite, pyrargyrite, akanthite and native silver, which occur in the fissure of the Fe-Mn carbonates, jasper and the early sulfides. Moreover, several silver minerals exist in the form of being wrapped in the sulfide. Some invisible silver can be found in the enargite. The silver mineralization is mainly formed in the No.II metallogenic stage and the silver is carried in the form of sulfur complex migration. With the change of physical and chemical conditions that belongs to the ore-forming fluid, the silver precipitate and form different kinds of silver minerals.
keywords:occurrence  silver minerals  epithermal deposit  Linzizong group  Sinongduo
  查看/发表评论  下载PDF阅读器
版权所有 《地球学报》编辑部 Copyright©2008 All Rights Reserved
主管单位:国土资源部 主办单位:中国地质科学院
地址: 北京市西城区百万庄大街26号,中国地质科学院东楼317室 邮编:100037 电话:010-68327396 E-mail: diqiuxb@126.com
技术支持:东方网景