Mesozoic magmatism is widely developed in the Liaodong Peninsula of the North China Craton. Previous studies mainly focused on the Late Triassic and Early Cretaceous magmatism. However, the role of the late Jurassic magmatism, which is closely related to the lithospheric thinning of the craton, is overlooked. Nevertheless, the late Jurassic is an important evolutional stage of the cratonic destruction. Thus, study on the late Jurassic magmatism can provide critical constraints on this issue. This study focuses on two representative late Jurassic plutons, i.e. the Wulong and Hushan plutons, which are mainly composed of monzogranite. Zircon U-Pb dating results show that the plutons were emplaced during ca. 161–158 Ma. They are high-K calc-alkaline series and I-type granite with high SiO2 (72.90%–75.02%) and Al2O3 (13.40%–14.28%) contents, but low MgO (0.14%–0.24%) and total Fe2O3 (0.79%–1.35%) contents. The plutons are enriched in light rare earth elements (LREEs) and large iron lithophile elements (LILEs: Rb, Ba and K), depleted in heavy rare earth elements (HREEs) and high field strength elements (HFSEs: Nb, Ta and Ti), and display negative Eu anomalies, which are similar to those of island arc igneous rocks. In addition, they are characterized by high Sr contents, Sr/Y (16.9–61.8) and (La/Yb)N (13.9–60.7) ratios, and low Y and Yb contents, which are similar to those of adakites derived from partial melting of thickened lower crust. The negative εHf(t) (−46.0 to −23.6) and old tDM2 ages (4075 to 2694 Ma) of zircons and whole-rock geochemistry indicate that the Wulong and Hushan monzogranites were generated by partial melting of Neoarchean-Paleoproterozoic crustal materials in the middle and upper crust with the participation of extraneous fluids, which were formed under the subduction of the paleo- Pacific plate. The abundant fluid activity may have facilitated the cratonic destruction and lithospheric thinning of the eastern North China Craton during the Late Jurassic to Early Cretaceous. © 2023 Science Press. All rights reserved.
