Garnet and scheelite chemistry of the Weijia tungsten deposit, South China: Implications for fluid evolution and W skarn mineralization in F-rich ore system

•Two stages of fluid exsolution are recognized in the Weijia W skarn deposit.•F-rich magmatic fluids are enriched in REEs, Y, Nb, Ta with flat REE patterns.•F consumption is critical for the compositional evolution of F-rich mineralizing fluids.•Combined garnet and scheelite trace elements are powerful in tracking W skarn mineralization.