Trace element modelling (REE and Sr/Y) suggests these elemental signatures of the Jingshan leucogranites can be consistently explained by a fluid-present crustal incongruent partial melting: Bt + Qz + Pl + H₂O = Grt + melt, leaving mainly Grt + Bt with minor allanite in the residuum.

The Jingshan leucogranites show relatively heavy δ⁷Li values (+ 4.0‰ to + 9.0‰) and low Li concentrations (4.7-11.3 ppm) in comparison to that for worldwide granites. In contrast, the residual enclaves show light δ⁷Li values (as low as + 0.6‰) and high Li concentrations (as high as 118 ppm).

Garnet separated from residual enclaves spans a narrow range of low δ⁷Li values (-1.5‰ to -0.1‰) with high Li concentrations from 32.9 to 81.7 ppm.

This work indicates that the Li isotopic compositions for magmatic rocks that are derived from anatexis of mid to lower crust may not be a faithful source indicator as commonly suggested.