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川西甲基卡花岗伟晶岩型锂矿床中熔体、流体包裹体固相物质研究
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  • 英文篇名:A study of solid minerals in melt inclusions and fluid inclusions from the Jiajika pegmatite-type lithium deposit
  • 作者:熊欣 ; 李建康 ; 王登红 ; 刘丽君 ; 代洪章
  • 英文作者:XIONG Xin;LI Jian-kang;WANG Deng-hong;LIU Li-jun;DAI Hong-zhang;MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences;School of Earth Sciences and Resources,China University of Geosciences;
  • 关键词:固相物质 ; 花岗伟晶岩 ; 锂矿床 ; 激光拉曼光谱 ; 扫描电镜 ; 局部岩浆分异
  • 英文关键词:solid minerals;;granitic pegmatite;;lithium deposit;;laser Raman spectrum;;scanning electron microscope;;local magma differentiation
  • 中文刊名:岩石矿物学杂志
  • 英文刊名:Acta Petrologica et Mineralogica
  • 机构:中国地质科学院矿产资源研究所自然资源部成矿作用与资源评价重点实验室;中国地质大学地球科学与资源学院;
  • 出版日期:2019-03-25
  • 出版单位:岩石矿物学杂志
  • 年:2019
  • 期:02
  • 基金:国家自然科学基金资助项目(41703048);; 中央级公益性科研院所基本科研业务费专项基金(YYWF201520);; 中国地质调查局地质矿产调查评价专项项目(DD20160055)~~
  • 语种:中文;
  • 页:99-111
  • 页数:13
  • CN:11-1966/P
  • ISSN:1000-6524
  • 分类号:P618.71;P588.1
摘要
川西甲基卡二云母花岗岩和伟晶岩内发育大量原生熔体包裹体和富晶体流体包裹体。为了查明甲基卡成矿熔体、流体性质与演化特征,运用激光拉曼光谱和扫描电镜鉴定了甲基卡花岗伟晶岩型锂矿床中二云母花岗岩及伟晶岩脉不同结构带内的原生熔体、流体包裹体的固相物质。分析结果表明,甲基卡二云母花岗岩石英内熔体包裹体的矿物组合为磷灰石+白云母、白云母+钠长石、白云母+石墨;伟晶岩绿柱石内富晶体流体包裹体的矿物组合主要为刚玉、富铝铁硅酸盐+刚玉+锂辉石、锂辉石+石英+锂绿泥石;伟晶岩锂辉石内富晶体流体包裹体的矿物组合主要为磷灰石、锡石、磁铁矿、石英+钠长石+锂绿泥石、萤石、富钙镁硅酸盐+富铁铝硅酸盐+富铁硅酸盐+石英;花岗岩浆熔体与伟晶岩浆熔体(流体)具有一定的差异,成矿熔体、流体成分总体呈现出碱质元素(Na、Si、Al)、挥发分(F、P、CO_2)含量增高及基性元素(Fe、Mg、Ca)降低的特征;包裹体中子矿物与主矿物的化学成分具有一定的差别,揭示出伟晶岩熔体(流体)存在局部岩浆分异作用,具不混溶性及非均匀性。因此认为,伟晶岩熔浆(流体)为岩浆分异与岩浆不混溶共同作用的产物,挥发分含量的增高(F、P、CO_2)使伟晶岩能够与稀有金属组成各类络合物或化合物,这对于稀有金属成矿起到了至关重要的作用。
        A large number of primary melt inclusions and crystal-rich fluid inclusions are developed in two-mica granites and pegmatites in Jiajika deposit,western Sichuan.In this study,the authors identified the mineral types of glass from melt inclusions of quartz in two-mica granite and daughter minerals from fluid inclusions of beryl and spodumene in pegmatites by means of laser Raman and scanning electron microscopy.According to the experimental results,Jiajika glass from melt inclusions of quartz in two-mica granite consists mainly of apatite + muscovite,muscovite + albite and muscovite + graphite.Crystals from fluid inclusions of beryl comprise mainly corundum,alumina-rich ferrosilicate + corundum + spodumene,spodumene + quartz + lithium chlorite.Crystals from fluid inclusions of spodumene are composed mainly of apatite,cassiterite,magnetite,quartz + albite + lithium chlorite,fluorite,calcium-magnesium-rich silicate + alumina-rich ferrosilicate + ferrosilicate + quartz.From early granite to pegmatite,the melts and fluids in the metallogenic melt and fluid in general showed high values of Na,Si,Al and F,and decrease of Fe,Mg and Ca.The ore-forming fluid of early granitic pegmatite magma to beryl and spodumene subminerals showed inheritance and some differences,with the existence of local pegmatite magma,magma immiscibility and non-uniformity.The increase of volatilization content of F,P and CO_2 in pegmatite played an important role in the mineralization of rare metals.
引文
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