Earth Science Frontiers ›› 2023, Vol. 30 ›› Issue (5): 106-114.DOI: 10.13745/j.esf.sf.2023.5.6

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Overview of magmatic-hydrothermal evolution of and rare element super enrichment in NYF pegmatites

RAO Can(), WANGWU Mengyu, WANG Qi, ZHANG Zhiqi, WU Runqiu   

  1. Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province, School of Earth Sciences, Zhejiang University, Hangzhou 310027, China
  • Received:2022-11-29 Revised:2022-12-13 Online:2023-09-25 Published:2023-10-20

Abstract:

NYF pegmatites as an important strategic mineral resource have not been widely studied. Compared to LCT pegmatites, NYF pegmatites have poor internal structural zonation and regional zonation but contain large amounts of Nb, Y, F and other rare minerals. The geochemical characteristics of columbite-/mica-group minerals and tourmaline can accurately reveal the magmatic-hydrothermal evolutionary process and reflect the degree of internal differentiation of NYF pegmatites; whereas volatile components such as F, B, P and H2O not only affect the degree of internal differentiation of the pegmatites but also play a crucial role in the super enrichment of rare elements. The enrichment, migration and crystallization of rare elements take place through all stages of magmatic-hydrothermal evolution; and the mineralization of rare metals (Nb, Be, Rb, Zr, Th, U) and rare earths (Y, Ce, Sc, etc.) may occur in the highly evolved pegmatites. In future, alkaline rocks/granites should be key exploration targets for NYF pegmatites; and researches on NYF pegmatites should be strengthened to guide ore prospecting.

Key words: structural zonation, crystallization differentiation, magmatic-hydrothermal evolution process, origin of pegmatite, rare metal mineralization, rare-earth mineralization

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