Indicator of Fluorite Sr and Nd Isotope to Mantle-Derived Ore-Forming Fluids in Maoniuping REE Deposit, Sichuan Province, China
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摘要: 萤石是四川牦牛坪稀土矿床主要的脉石矿物之一, 其形成贯穿了整个稀土成矿过程, 因此同位素的研究对探讨萤石和稀土成矿流体的来源具有重要的价值.矿区6件萤石样品的Sr、Nd同位素组成没有明显差异.结合围岩(碳酸岩-正长岩, 花岗岩)同位素组成特征研究表明, 不同颜色、来自不同矿石类型、具有不同REE类型的萤石为同源产物, 稀土成矿流体来源于富集地幔, 与区内碳酸岩-正长岩岩浆活动密切相关.Abstract: Fluorite is main vein mineral in Maoniuping REE deposit, whose formation ran through the whole mineralization process. So the isotopic study plays an important role in probing the source of fluorite and REE ore-forming fluid. The Sr, Nd isotopic composition of 6 fluorite samples from Maoniuping orefield are similar. According to Sr, Nd isotopic data of the wall rocks (carbonatite-syenite, granite), it is shown: that different REE distribution fluorites from different colors and ore type are the products of the same source; REE ore-forming fluids come from the enriched mantle and are closely related with magma action of carbonatite-syenite.
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Key words:
- fluorites /
- Sr, Nd isotope /
- carbonatite-syenite /
- Maoniuping REE deposit
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图 2 不同地区萤石[w(87Sr)/w(86Sr)] 0-[w(143Nd)/w(144Nd)]0
图a中, MNP为牦牛坪稀土矿区萤石; ★为矿区花岗岩; AD为产于印度Amba Dongar碱性岩(硅酸岩-碳酸岩)地区萤石[2]; Ar、Ir、Sp引自文献[16~18], 其成矿流体主要来源于花岗岩.图b中方框为矿区萤石, 椭圆为碱性岩(正长岩-碳酸岩); DMM、HIMU、EM1和EM2引自文献[27], [w(87Sr)/w(86Sr)]Bulk Earth=0.704 5、[3(143Nd)/w(144Nd)]CHUR=0.512 363 8引自文献[28]
Fig. 2. [w(87Sr)/w(86Sr)]0-[w(143Nd)/w(144Nd)]0 of different regional fluorites
表 1 牦牛坪稀土矿床萤石Sr、Nd同位素组成
Table 1. Sr-Nd isotope of fluorite in Maoniuping REE deposit
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