Sibagaon pegmatites in Northwest India demonstrate transition from barren granitic magmatism to LCT mineralization, offering geochemical insights to refine rare metal exploration models. Hosted in calc-silicate rocks, these pegmatites are highly fractionated, peraluminous, LCT-type, show syn- to post-collisional signatures and feature lepidolite (contain up to 2.34 w-t% Li 2 O) as primary Li- mineral, followed by elbaite to liddicoatite tourmalines. Geochemical markers distinguishing them from barren granites include low Nb/Ta ratios, REE tetrad effects, non-CHARAC behavior, and linear Li-F correlation. Lepidolite and tourmaline exhibit core to rim Li and F enrichment. Tourmalines with liddicoatite rims and feldspar replacement textures indicate late stage CaO rich fluid contamination. This study illustrates a continuum from fractional crystallization to magmatic-hydrothermal interaction with late Li-F fluid influx causing rare metal mineralization. These signatures with inferred resource of 91,295 tonnes at 0.673 wt-% Li 2 O provide a quantitative framework for identifying similar prospects in evolved collisional granitic systems.
Choudhury et al. (Wed,) studied this question.
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