Evidence for lithium-aluminosilicate supersaturation of pegmatite-forming melts

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• 作者：Victoria Maneta ; Don R. Baker ; William Minarik
• 关键词：Granitic pegmatites ; Lithium ; Supersaturation ; Moblan ; Spodumene ; Petalite
• 刊名：Contributions to Mineralogy and Petrology
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：170
• 期：1
• 全文大小：1,495 KB
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• 作者单位：Victoria Maneta (1)
  Don R. Baker (1)
  William Minarik (1)
  
  1. Department of Earth and Planetary Sciences, McGill University, 3450 University Street, Montreal, QC, H3A 0E8, Canada
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geology
  Mineral Resources
  Mineralogy
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0967

文摘

New experimental data on the solubility of lithium (Li) at spodumene (LiAlSi2O6) and petalite (LiAlSi4O10) saturation at 500?MPa and 550-50?°C reveal evidence for lithium supersaturation of pegmatite-forming melts before the formation of Li-aluminosilicates. The degree of Li enrichment in granitic melts can reach ~11,000?ppm above the saturation value before the crystallization of Li-aluminosilicate minerals at lower temperatures. Comparison of the experimental results with the spodumene-rich Moblan pegmatite (Quebec) is consistent with extreme Li enrichment of the pegmatite-forming melt prior to emplacement, which cannot be explained with equilibrium crystallization of Li-aluminosilicates from a common granitic melt. The results of this study support the model of disequilibrium fractional crystallization through liquidus undercooling as the most plausible mechanism for the generation of such Li-rich ore resources.