Crystallisation of magmatic topaz and implications for Nb-Ta-W mineralisation in F-rich silicic melts 鈥?The Ary-Bulak ongonite massif
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- 作者：Andrea Agangia ; b ; 1 ; Vadim S. Kamenetskyb ; Axel Hofmanna ; 1 ; Wojciech Przyby艂owiczc ; d ; Nikolay V. Vladykine
- 关键词：Topaz ; Fluorine ; Cryolithionite ; Ongonite ; Cathodoluminescence
- 刊名：Lithos
- 出版年：August 2014
- 年：2014
- 卷：202-203
- 期：Complete
- 页码：317-330
- 全文大小：5336 K
文摘
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We studied the cathodoluminescence and chemical characteristics of topaz phenocrysts.
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Topaz records trace element (Li, Nb, Ta, W) variations of the coexisting melt.
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Melt inclusions record an increase in F with progressing fractionation.
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Separation of cryolithionite [Na3Li3Al2F12] promoted precipitation of Nb–Ta–W oxides