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Li-Cs-Rb Mineralisation in Proterozoic Zoned Pegmatites of Beku, West Bengal
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The Li-Cs-Rb bearing Beku pegmatite occurs in a calc-silicate rock enclave within the Proterozoic Chhotanagpur Gneissic Complex (CGC). Its internal structure shows zonation that comprises an outer tourmaline-rich pegmatite and inner rare metal-bearing pegmatite containing spodumene-pollucite-lepidolite. The pegmatite is strongly peraluminous with high SiO2, low Fe2O3(t), CaO, TiO2, P2O, and variable Al2O3, K2O and Na2O. Its Cs/Rb and Li/Rb values increase towards the centre and decrease towards the boundary. K/Rb value increases from pollucite-bearing pegmatite to tourmaline-rich pegmatite, depicting the more evolved nature of the pollucite-bearing pegmatite. Petrography and geochemistry of the Beku pegmatite suggest fractionation from a peraluminous S-type granitic magma. It is synchronous with shear development in the area, under a minimum formational P-T of 4 kbar and 500°C.
Keywords
Rare Metal (Li-Cs-Rb) Pegmatite, Calc Silicate Rock, Proterozoic, Chhotanagpur Gneissic Complex, Beku, West Bengal.
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