滇西小龙河与来利山云英岩型锡矿成矿流体氧逸度对比分析
Ore -forming fluid oxygen fugacity comparative analysis for Xiaolonghe and Lailishan Greisen-Type tin Depoist in West Yunnan
投稿时间:2014-06-21  修订日期:2014-06-21
DOI:
中文关键词:  滇西  锡矿床  云英岩型  成矿流体  氧逸度
英文关键词:Western Yunnan  Tin ore deposit  Greisen-type  Ore-forming fluids  Oxygen fugacity
基金项目:国土资源部公益性行业科研专项经费项目(编号:201211022),中国地质调查局项目(编号:1212011085466)
作者单位邮编
桑浩 中国地质大学武汉资源学院
内蒙古第四矿产勘查开发院
广西大学 资源与冶金学院
云南省地质调查局 
430074
夏庆霖 中国地质大学武汉资源学院 430074
赵京 广西大学 资源与冶金学院 
蒋铮 云南省地质调查局 
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中文摘要:
      来利山矿床与小龙河矿床是滇西地区典型的云英岩型锡矿床。为揭示它们在成因上深层次的差异性,本文对来利山锡矿和小龙河锡矿的锡石进行了电子探针成分分析和镜下观察,并进行了成矿环境对比分析,结果表明:锡石中的铁多以Fe3+的形式与Sn4+发生类质同象,氧逸度越高锡石中Fe3+越多且在宏观上表现为锡石的颜色越深。来利山矿区锡石中Fe含量明显低于小龙河矿区,且颜色明显比小龙河矿区锡石颜色浅,反映了来利山锡矿成矿环境相对开放,成矿流体氧逸度偏低,流体中Sn络合物迁移能力较强,在花岗岩体外接触带的围岩裂隙中形成外云英岩型系矿床;而小龙河锡矿成矿环境相对封闭,成矿流体氧逸度偏高,流体中Sn络合物迁移能力较弱,则在花岗岩体顶部的构造裂隙中形成内云英岩型锡矿床。
英文摘要:
      Lailishan and Xiaolonghe are Typical greisen type tin deposit in Western Yunnan.In order to reveal their deeper causes of the differences,In this paper,Lailishan Tin deposit and Xiaolonghe Tin deposit were observed by microscope and analyzed by Electron microprobe,and comparative analysis of their metallogenic environment.The results shows: the iron in cassiterite in most cases like to be Fe3+and occurred isomorphous with Sn4+, the higher Oxygen fugacity the higher ferric ion levels and the darker cassiterite.The iron content in Lailishan tin deposit is significantly lower than the Xiaolonghe tin deposit,and the color is significantly lighter than the cassiterite in Xiaolonghe tin deposit,which reflects that Lailishan belong to open Metallogenic environment and has low oxygen fugacity in ore-forming fluids,the tin complexes in ore-forming fluids has a strong migration capability,thus formed external greisen-type tin deposit,outside the granite contact zone ;Xiaolonghe belong to closed Metallogenic environment and has high oxygen fugacity in ore-forming fluids,the tin complexes in ore-forming fluids has a weak migration capability,thus formed internal greisen-type tin deposit, inside the granite contact zone.
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