Lithium, the lightest alkali metal, is commonly enriched in highly evolved pegmatites. This element presents two stable isotopes, 6Li and 7Li, with a significant mass difference (≈17%) that allows an important isotopic fractionation (>80‰ for δ7Li values) during different geological processes in the upper layers of the Earth (Tomascak et al. 2016). Crystallization of H2O-rich granite-pegmatite systems at relatively low temperature has been suggested as effective conditions for Li-isotopic fractionation (e.g., Teng et al. 2006, Barnes et al. 2012). The Berry-Havey pegmatite (Maine, USA) is...

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