Tantalum-niobium mineralization of the Taikeu ore cluster, the Polar Urals

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• 作者：N. V. Vasil’ev (1)
  V. Yu. Chevychelov (1)
  G. P. Zaraisky (1)
  G. P. Borodulin (1)
  O. V. Udoratina (2)
  
• 刊名：Geology of Ore Deposits
• 出版年：2009
• 出版时间：December 2009
• 年：2009
• 卷：51
• 期：7
• 页码：537-548
• 全文大小：526KB
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• 作者单位：N. V. Vasil’ev (1)
  V. Yu. Chevychelov (1)
  G. P. Zaraisky (1)
  G. P. Borodulin (1)
  O. V. Udoratina (2)
  
  1. Institute of Experimental Mineralogy, Russian Academy of Sciences, ul. Institutskaya 4, Chernogolovka, Moscow oblast, 142432, Russia
  2. Institute of Geology, Komi Scientific Center, Ural Division, Russian Academy of Sciences, ul. Pervomaiskaya 54, Syktyvkar, 167982, Russia
  
• ISSN：1555-6476

文摘

The Taikeu ore cluster comprises four tantalum-bearing ore deposits: Taikeu, Ust-Mramorny, Longotyugan, and Neudachny. Their ores are related to microcline-albite and less frequent quartz-albite-mica (phengite) metasomatic rocks replacing granites. The major ore minerals belong to the fergusonite and pyrochlore groups (mainly plumbopyrochlore). The compositional evolution of these minerals is considered in detail. High-Yb fergusonite containing up to 22-7 wt % Yb2O3 was established in the ore cluster for the first time. Its formula is ({Yb0.30Er0.15Dy0.05Lu0.04Tm0.04…}0.61Y0.39)[Nb0.99Ta0.01]O3.96. The density of this mineral determined by microvolumetric method is 6.47 ± 0.06 g/cm3. Fergusonite evolves from high-Yb to low-Yb varieties, with relatively small variations in Er and Dy. It is suggested that this fractionation trend is caused by high solubility of Yb2+ complexes (primarily, fluoride complexes) in aqueous fluid during albitization. The chemical composition of the pyrochlore-group minerals evolves as follows: Na+Ca ?U+Th ?Pb. Plumbopyrochlore was formed at the late metasomatic stage of tantalum-niobium mineralization. The characteristic features of this stage are a high oxidation potential, on the one hand, and a low activity of sulfide sulfur, on the other hand.