| 四川省牦牛坪稀土矿床成矿流体与碳酸岩正长岩杂岩体成因联系评述(英文) |
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| 作者姓名： | 许成 黄智龙 漆亮 |
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| 作者单位： | 中国科学院地球化学研究所, 贵阳 550002 |
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| 摘 要： | 四川省牦牛坪稀土矿床是中国第二大原生轻稀土矿床,萤石是矿区主要脉石矿物之一,碳酸岩和正长岩在空间和时间上与稀土成矿存在密切联系.在过去萤石和碳酸岩 -正长岩杂岩体地球化学研究的基础上,评述了稀土成矿流体与碳酸岩-正长岩杂岩体的成因联系.矿区碳酸岩和正长岩具有相似的REE配分模式、( 87Sr 86Sr)0,( 143 Nd 144 Nd)0,206Pb 204Pb,208Pb 204Pb同位素比值,位于地幔端元EM1和EM2之间,它们是造山环境的产物.与稀土矿化共生的萤石显示不同的稀土配分模式,但是它们具有一致的Sr、Nd、Pb同位素比值,与碳酸岩和正长岩相似.这些表明不同稀土特征的萤石来自相同的源区,稀土成矿流体与碳酸岩和正长岩岩浆存在密切联系.
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| 关 键 词： | 成矿流体 碳酸岩正长岩 萤石 牦牛坪稀土矿床 |
| 收稿时间： | 2004-03-25 |
Genetic Relation of Ore-Forming Fluids andCarbonatite-Syenite Complex in MaoniupingREE Deposit,Sichuan Province,China: A Review |
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| Authors: | XU Cheng HUANG Zhi-Long QI Liang |
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| Institution: | Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China |
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| Abstract: | The Maoniuping REE deposit is the second largest primary light REE deposit in China.Fluorite is one of main gangue minerals in the orefield. Carbonat ites and syenites are spatially andtemporally associated with rare earth mineralization. Based on the previous geochemical studies of fluoriteand carbonat ite-syenite complex, we review the genetic relation of REE ore-forming fluids andcarbonatite-syenite complex. It shows that carbonatites and syenites have similar REE distributionpatterns, ( 87SrP87Sr) 0, ( 143NdP144Nd) 0, 206PbP204Pb, 208PbP204Pb ratios, and plot to the area between themantle end-member EM1 and EM2.They were formed in orogenic setting. Fluorites associated with REEmineralization display different REE distribution patterns, but their Sr, Nd, Pb isotopic ratios areuniform, and are similar to those of carbonatites and syenites. This suggests that the different REEfluorites were products of the same source, and REE ore-forming fluids were related to carbonat ite andsyenite magmas. |
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| Keywords: | ore-forming fluids carbonat ite-syenite fluorite Maoniuping REE deposit |
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