赣南西华山花岗岩的云母成分特征及其对岩浆演化与成矿过程的指示
Insights on magmatism and mineralization from micas in the Xihuashan granite, Jiangxi Province, South China
查看参考文献57篇
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文摘
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西华山钨矿为华南地区最重要的钨矿产区之一,其形成与西华山复式岩体的岩浆演化过程密切相关。随着岩浆演化,西华山钨矿区花岗岩的云母成分发生变化,三八面体云母和二八面体云母分别按“富铁黑云母→铁叶云母→黑鳞云母”和“白云母/多硅白云母→富锂多硅白云母”的方向演化。Li 主要通过“Fe~(2+)+Mg→Al~(Ⅵ)+Li”置换方式进入云母晶格,在岩浆演化过程中云母的 Li 含量逐渐升高。F 在云母-熔体间的分配系数随着云母的Mg~#(Mg~#=100Mg/(Mg+Mn+Fe))降低而减小,因此岩浆演化过程中云母的F含量未明显升高,有利于熔体富集 F 并演化至更高程度。另外,西华山成矿花岗岩的云母因受到流体交代作用而普遍发育环带结构。环带结构云母的边部与核部相比具有明显较低的Li、F,属于多硅白云母,而出现与多硅白云母共存的方解石表明交代作用流体富含CO_2。因此,西华山含矿花岗岩在岩浆演化过程中存在含CO_2、相对贫Li和F流体的加入。西华山花岗岩中云母成分的变化还指示体系的氧逸度曾发生变化,即从高氧逸度环境转变为氧逸度相对较低的环境,有利于钨矿的形成。 |
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其他语种文摘
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The Xihuashan tungsten deposit, as one of the most important deposits in South China, has close relationship with magmatic evolution of the Xihuashan granitic complex. Micas in granitic rocks associated with the Xihuashan tungsten deposit are highly variable in two coeval trends. The trioctahedron micas changed in the evolution sequence of “Fe-biotite→ siderophyllite → protolithionite”, and the dioctahedron micas evolved from muscovite/phengite to Li phengite. Li incorporates into the crystal lattice of mica through the substitution of“Fe~(2+)+Mg → Al~(Ⅵ)+Li”, which increases Li contents in the mica during the evolution. However, the mica’s F contents are nearly invariable because the partition coefficient for F between mica and melt decreases with decreasing mica’s Mg~#(=100Mg/(Mg+Mn+Fe)) value. For the low partition coefficient, fluorine was reserved dominantly in the melt, which would promote the magmatic evolution and mineralization. Due to the fluid metasomatism, the zoning micas are ubiquitous in the Xihuashan W-bearing granites. Li and F contents in the rims as phengite are much lower than those in the cores of the zoning micas. Additionally, some calcite grains associated with phengite were formed by CO_2-rich fluid metasomatism. It is suggested that some high-CO_2 but low-Li and F fluids have participated during evolution of the Xihuashan granites. Furthermore, the variation of micas reveals that oxygen fugacity in the Xihuashan granites had changed. The magmatic system had shifted to less oxidizing condition during evolution, which is important for the tungsten-mineralization. |
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来源
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地球化学
,2013,42(5):393-404 【核心库】
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关键词
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云母
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环带结构
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岩浆演化
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流体交代
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氧逸度
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钨矿
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华南
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地址
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中国科学院广州地球化学研究所, 同位素地球化学国家重点实验室, 广东, 广州, 510640
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0379-1726 |
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学科
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地质学 |
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基金
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国家973计划
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中国科学院知识创新工程项目
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国家自然科学基金创新研究群体项目
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文献收藏号
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CSCD:4958830
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