Ta and Sn concentration by muscovite fractionation and degassing in a lens-like granite body: The case study of the Penouta rare-metal albite granite (NW Spain)

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• 作者：Francisco Javier Ló ; pez-Moro^a ; ^b ; ^{jlopez@strategicminerals.com} ; Francisco Garcí ; a Polonio^a ; ^b ; Teresa Llorens Gonzá ; lez^a ; ^b ; José ; Luis Sanz Contreras^c ; Agustina Ferná ; ndez Ferná ; ndez^b ; Marí ; a Candelas Moro Benito^b
• 关键词：Fractional crystallisation ; Ta/Nb ratio ; Degassing ; Central Iberian Zone
• 刊名：Ore Geology Reviews
• 出版年：2017
• 出版时间：April 2017
• 年：2017
• 卷：82
• 期：Complete
• 页码：10-30
• 全文大小：3000 K
• 卷排序：82

文摘

A single pulse of granite melt was subhorizontally emplaced evolving upwards. Columbite-tantalite crystallized in non-equilibrium conditions and did not fractionate Ta or Nb. Ta/Nb concentration in the melt was mainly due to muscovite removal in emplacement place. Lower margin degassing could promote Sn enrichment in the central part of the granite. Geometry and age of the albite granites help to cooling and vapour saturation.