庙垭碳酸岩型稀土矿床成矿过程初探
A Preliminary Study on Genesis of REE Deposit in Miaoya
查看参考文献37篇
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文摘
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庙垭碳酸岩位于东秦岭武当山隆起的西南缘,呈岩株状产出,主要由方解石组成,富含稀土矿物,是我国大型轻稀土矿床。该区全岩的C-O同位素数据δ18O=11‰～12.49‰,δ13 C=-3.79‰～5.68‰,落在了初始火成碳酸岩的范围之外,表明可能受到高温分离作用的影响。流体包裹体相态较单一,主要由气液两相包裹体和气液三相包裹体组成,均一温度120～400℃,为中低温,盐度为3.89‰～10.48‰为中低盐度,这与典型的碳酸岩中流体包裹体具有相似的特征。通过与牦牛坪典型的岩浆热液脉型REE矿床在C-O同位素、包裹体及微量元素的对比研究,发现两者的成因机制并不相同,庙垭稀土矿床是典型的岩浆型,缺少萤石等热液矿脉,大量矿物的分离结晶,特别是方解石的堆积结晶作用,导致其方解石具有相对较低的均一温度和盐度,这也使碳酸岩岩浆更富集REE,有利于REE成矿。 |
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其他语种文摘
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The Miaoya REE deposit associated with carbonatite-syenite complexes is located in the southwestern margin of the Wudang Terrane at the east Qinling orogenic belt.The carbonatite occurs as stocks and principally consists of calcite.The carbonatite-syenite complexes contain abundant REE-rich minerals,and form a large LREE deposit in China.The carbonatite C-O isotopic data areδ18O=11‰～12.49‰,and δ13 C=-3.79‰～5.68‰, which is deviated from primary mantle-derived C-O isotopic compositions,indicating that they were affected by high temperature fractional crystallization.The phases of fluid inclusions are much uniform.There are two types of fluid inclusions having been observed,including two-phase and three-phase fluid inclusions.The fluid inclusions have homogeneous temperature from 120℃to 400℃and moderate-low salinity from 3.89‰to 10.48‰.There are similar features with typical carbonatites worldwide.Compared with REE deposit of hydrothermal ore-veins in Maoniuping in C-O isotope,fluid inclusions and trace elements,there are different genesis processes.Miaoya carbonatite is typical magmatic REE deposit,which is absent in hydrothermal gangue mineral veins,such as fluorite and so on.The fractional crystallization of abundant minerals,particularly calcite resulted in that the fluid inclusions have comparatively low temperature and salinity and make the residual carbonatitic liquids much richer in REE to form REE deposit. |
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来源
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矿物学报
,2011,31(3):478-484 【核心库】
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关键词
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碳酸岩
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C-O同位素
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流体包裹体
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稀土成矿
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庙垭稀土矿床
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地址
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中国科学院地球化学研究所, 中国科学院地球深部物质与流体作用地球化学研究室, 贵州, 贵阳, 550002
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北京大学, 造山带与地壳演化教育部重点实验室, 北京, 100871
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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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1000-4734 |
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学科
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地质学 |
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基金
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国家自然科学基金
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北京大学青年人才计划项目
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文献收藏号
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CSCD:4327436
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