首页|Lithium Isotopic Fractionation in Minerals from Pegmatites:Perspective of Crystal Chemistry
Lithium Isotopic Fractionation in Minerals from Pegmatites:Perspective of Crystal Chemistry
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Lack of information regarding lithium(Li)crystal chemistry in numerous minerals,espe-cially those containing trace amounts of Li(ranging from a few to tens of ppm),limits our understand-ing of Li isotopic fractionation in pegmatites.In this study,we examined the Li isotopic composition and Li content in various Li-poor(e.g.,quartz or feldspar)together with Li-rich(sopdumene or lepidolite)mineral phases within granitic pegmatites.We compiled a comprehensive dataset,encompassing a broad spectrum of Li contents(ranging from a few to tens of thousands of ppm)and Li isotopic values(-8‰ to 41‰).The minerals exhibit distinct Li isotopic signatures.Specifically,elbaite and beryl show the highest values,while biotite displays a negative average.Compared to individual minerals,whole rocks demonstrate lower Li isotopic values,with pegmatites exhibiting the highest and non-granitic peg-matite wall rocks showing the lowest.Our study also uncovers a clear"V"shape relationship between Li isotopic values and logarithm of Li contents,with different mineral groups occupying specific regions within this shape.Furthermore,a significant correlation was observed between average Li isotopic val-ues and Li-O(OH,F)bond lengths in various minerals.These discoveries underscore the crucial role of crystal chemistry in shaping the Li isotopic behavior in pegmatites from a statistical perspective.
Li isotopic fractionationLi contentbond lengthpegmatitecrystal chemistryminer-als
Shan-Ke Liu、Ben-Xun Su
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Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China
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