芙蓉锡矿田骑田岭花岗岩黑云母矿物化学组成及其对锡成矿的指示意义
Mineral chemistry of biotite in the Qitianling granite associated with the Furong tin deposit: Tracing tin mineralization signatures
查看参考文献51篇
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文摘
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芙蓉锡矿田骑田岭复式岩体主要由早阶段角闪石黑云母花岗岩和晚阶段黑云母花岗岩组成.电子探针分析结果表明角闪石黑云母花岗岩中的黑云母属于铁黑云母,黑云母花岗岩中的黑云母属于铁叶云母.相对于黑云母花岗岩,角闪石黑云母花岗岩中黑云母的MgO、TiO_2含量偏高,Al_2O_3含量偏低.矿物化学研究结果显示,角闪石黑云母花岗岩中黑云母的结晶温度 氧逸度 (log f_(O_2))分别为680℃～740℃、-16.00～-15.31,黑云母花岗岩中黑云母的结晶温度 氧逸度分别为530℃～650℃、-19.20～-17.50.从角闪石黑云母花岗岩到黑云母花岗岩,岩浆结晶温度和氧逸度逐渐降低.与花岗岩有关的共存流体性质的研究发现,与角闪石黑云母花岗岩共存的热液流体log(f_(H_2O)/f_(HF))~(fluid), log(f_(H_2O)/f_(HCl))~(fluid), log(f_(HF)/f_(HCl))~(fluid)值分别为 4.22～4.39, 2.78～3.24, -1.82～-1.73,而与黑云母花岗岩共存的热液流体log(f_(H_2O)/f_(HF))~(fluid), log(f_(H_2O)/f_(HCl))~(fluid), log(f_(HF)/f_(HCl))~(fluid) 值分别为3.27～3.53, 2.85～3.22,-0.75～-0.22,可见与两种岩石类型共存热液流体的性质存在明显差异,且热液中Cl、Sn含量变化与岩浆结晶分异指数呈正相关关系.骑田岭岩体从角闪石黑云母花岗岩到黑云母花岗岩,随着岩浆的演化,岩浆结晶期后分异出的热液流体向富Cl和Sn方向演化.芙蓉锡矿田的成矿流体应主要来源于黑云母花岗岩岩浆结晶期后分异出的岩浆热液. |
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其他语种文摘
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The Qitianling granite complex associated with the Furong tin deposit is composed primarily of hornblende-biotite granite and biotite granite, with the latter being intruded later than the former. Electron microprobe analysis indicates that biotite from hornblende-biotite granite is annite and that biotite from biotite granite is siderophyllite. The biotite from hornblende-biotite granite has higher MgO and TiO_2 contents but lower Al_2O_3 contents than the biotite from biotite granite. The crystallization temperatures and oxygen fugacities (logf_(O_2)) of the biotite in hornblende-biotite granite are 680 to 740℃ and -16.00 to -15.31 respectively, and those of the biotite in biotite granite are 530 to 650℃ and -19.20 to -17.5 respectively. The temperatures and oxygen fugacities decrease gradually from hornblende-biotite granite to biotite granite. Study of the nature of the hydrothermal fluids coexisting with the Qitianling granite indicates that the values of log(f_(H_2O)/f_(HF))~(fluid), log(f_(H_2O)/f_(HCl))~(fluid) and log(f_(HF)/f_(HCl))~(fluid) of the hydrothermal fluids coexisting with hornblende-biotite granite are 4.22 to 4.39, 2.78 to 3.24 and -1.82～ to 1.73 respectively, and those of the hydrothermal fluids coexisting with hornblende-biotite granite are 3.27 to 3.53, 2.85 to 3.22 and -0.75 to -0.22 respectively. Therefore the fluids coexisting with the two types of granite are different obviously in nature, and there is a positive correlation between the contents of Cl and Sn in hydrothermal fluids and the crystallization differentiation index of magmas. From hornblende-biotite granite to biotite granite, hydrothermal fluids separated during magmatic crystallization became Cl- and Sn-rich with magmatic evolution, and the ore-forming fluids should be mainly derived from the magmatic hydrothermal fluids separated during the crystallization of biotite granitic magma. |
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来源
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岩石学报
,2007,23(10):2605-2614 【核心库】
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关键词
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骑田岭花岗岩
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芙蓉锡矿田
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黑云母矿物化学
;
锡成矿
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地址
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中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵阳, 550002
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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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1000-0569 |
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学科
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地质学 |
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基金
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中国科学院知识创新工程重要方向项目
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国家自然科学基金
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国家973计划
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中国科学院人才培养计划项目
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文献收藏号
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CSCD:3144883
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