“…These rocks are depleted (ppm) Ba (≤ 20), Sr (≤ 15.4), Y (≤ 0.46), Th (≤ 2.5), and Zr (≤ 22). They demonstrate low fractionation indexes: Mg/Li ≤ 0.05 and Zr/Hf ≤ 7.4 (Morozova, 2018(Morozova, , 2019. Rare-metal lithium-cesium-tantalum (LCT) pegmatites from other regions of the world have similar geochemical features (Chachowsky, 1987;Černý, 1991, 1992Lagache, 1997;Černý and Ercit, 2005;Zhu et al, 2006;London, 2008).…”