The Paleoproterozoic L(u|¨)liang Metamorphic Complex(PLMC) is situated in the middle segment of the western margin of the Trans-North China Orogen(TNCO),North China Craton(NCC). As the most important lithological assemblages in the southern part of the PLMC,Guandishan granitoids consist of early gneissic tonalities,granodiorites and gneissic monzogranites,and younger gneissic to massive monzogranites.Petrochemical features reveal that the early gneissic tonalities and granodiorites belong to the medium-K calc-alkaline series;the early gneissic monzogranites are transitional from high-K calc-alkaline to the shoshonite series;the younger gneissic to massive monzogranites belong to the high-k calc-alkaline series,and all rocks are characterized by rightdeclined REE patterns and negative Nb,Ta,Sr,P,and Ti anomalies in the primitive mantle normalized spidergrams.SHRIMP zircon U-Pb isotopic dating reveals that the early gneissic tonalities and granodiorites formed at～2.17 Ga,the early gneissic monzogranites at～2.06 Ga,and the younger gneissic to massive monzogranites at～1.84 Ga.Sm-Nd isotopic data show that the early gneissic tonalities and granodiorites haveε_(Nd)(t) values of +0.48 to -3.19 with Nd-depleted mantle model ages (T_(DM)) of 2.76-2.47 Ga,and early gneissic monzogranites haveε_(Nd)(t) values of-0.53 to -2.51 with F_(DM)of 2.61-2.43 Ga,and the younger gneissic monzogranites haveε_(Nd)(t) values of -6.41 to -2.78 with a T_(DM)of 2.69-2.52 Ga.These geochemical and isotopic data indicate that the early gneissic tonalities, granodiorites,and monzogranites were derived from the partial melting of metamorphosed basaltic and pelitic rocks,respectively,in a continental arc setting.The younger gneissic to massive monzogranites were derived by partial melting of metamorphosed greywackes within the continental crust.Combined with previously regional data,we suggest that the Paleoproterozoic granitoid magmatism in the Guandishan granitoids of the PLMC may provide the best geological signature for the complete spectrum of Paleoproterozoic geodynamic processes in the Trans-North China Orogen from oceanic subduction,through collisional orogenesis,to post-orogenic extension and uplift. The Paleoproterozoic L (u | ¨) liang Metamorphic Complex (PLMC) is situated in the middle segment of the western margin of the Trans-North China Orogen (TNCO), North China Craton (NCC). As the most important lithological assemblages in the southern part of the PLMC, Guandishan granitoids consist of early gneissic tonalities, granodiorites and gneissic monzogranites, and younger gneissic to massive monzogranites. Petrochemical features reveal that the early gneissic tonalities and granodiorites belong to the medium-K calc-alkaline series; the early gneissic monzogranites are transitional from high-K calc-alkaline to the shoshonite series; the younger gneissic to massive monzogranites belong to the high-k calc-alkaline series, and all rocks are characterized by right developed REE patterns and negative Nb, Ta, Sr, P , and Ti anomalies in the primitive mantle normalized spider grams. SHRIMP zircon U-Pb isotopic dating reveals that the early gneissic tonalities and granodiorites formed at ~ 2.17 Ga, the early gne issic monzogranites at ~ 2.06 Ga, and the younger gneissic to massive monzogranites at ~ 1.84 Ga.Sm-Nd isotopic data show that the early gneissic tonalities and granodiorites have ε_ (Nd) (t) values ​​of +0.48 to -3.19 with Nd-depleted mantle model ages (T_ (DM)) of 2.76-2.47 Ga, and early gneissic monzogranites haveε_ (Nd) (t) values ​​of -0.53 to -2.51 with F_ (DM) of 2.61-2.43 Ga, and the younger gneissic monzogranites haveε_ (Nd) (t) values ​​of -6.41 to -2.78 with a T_ (DM) of 2.69-2.52 Ga.These geochemical and isotopic data indicate that the early gneissic tonalities, granodiorites, and monzogranites were derived from the partial melting of metamorphosed basaltic and pelitic rocks, respectively, in a continental arc setting. younger gneissic to massive monzogranites were derived by partial melting of metamorphosed greywackes within the continental crust. Cated with previously regional data, we suggest that the Paleoproterozoic granitoid magmatism in the Guandishan granitoids of the PLMC may provid e the bestgeological signature for the complete spectrum of Paleoproterozoic geodynamic processes in the Trans-North China Orogen from oceanic subduction, through collisional orogenesis, to post-orogenic extension and uplift.