Pegmatite lithium deposits formed within low-temperature country rocks.

A decreasing trend of Li content with increasing distance from the contact can be ascribed to either fluid metasomatism 31 or the migration of Li by diffusion 12 , 13 , 32 , 33 .

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More importantly, both Li contents (decreasing from 974 to 239 ppm) and Li isotopic compositions (δ 7 Li decreasing from +1.5‰ to −13.8‰) show a clear trend of change with increasing distance from the pegmatite–country-rock contact (Fig. 3 b, d ).

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