Abstract:Wulashan is located in the middle section of the Khondalite Belt, western North China Craton, with well-developed supracrustal rocks mainly composed of garnet-biotite gneiss. They underwent strong metamorphism, deformation and anateixs, resulting in the formation of garnet granite. This study conducted field geological, geochemical, and zircon SHRIMP U-Pb geochronological studies on the garnet granite. There are often transitional relationships between garnet-biotite gneiss, anatectic garnet-biotite gneiss and garnet granite, with the garnet granite exhibiting in situ to semi in situ properties. Four garnet granite samples have the metamorphic-anatectic zircon ages of 2442~2463 Ma. Considering the strong overprinting of late Paleoproterozoic tectonothermal event, it is reasonable to tentatively set the formation age of garnet granite between 2.45 and 2.5 Ga or closer to 2.5 Ga. This supports the conclusion that garnet-biotite gneiss formed in the late Neoarchean. The garnet granite shows large variations in elemental composition, with SiO2, TFeO, MgO, Na2O, and K2O contents of 66.41 %~73.79 %, 0.15 %~4.02 %, 0.07 %~1.57 %, 2.96 %~5.27 %, and 1.54 %~5.27 %, respectively. TREE, (La/Yb)n, and Eu/Eu* are 83.45×10-6~262.44×10-6, 11.2~182.6 and 1.15~3.62, respectively. They have whole rock εNd(t) of -0.18 to 1.65 and tDM2(Nd) of 2.60 to 2.77 Ga, while metamorphic-anatectic zircons have εHf(Hf) of -0.86 to 4.54 and tDM2(Hf) of 2.69~3.04 Ga. The significant variation of garnet granite in elemental composition largely reflect the differences in the composition of their source regions and the garnet differentiation degree during their formation process. The source rocks are late Neoarchean meta-clastic sedimentary rocks with different maturity (mainly garnet-biotite gneiss). The formation of the garnet granite marks a transition of the tectonic regime from compression to extension in the early Paleoproterozoic to the late Neoarchean, as well as the initial stabilization of the metamorphic basement.