A little Mesozoic dike rocks develop in Sishilichang Mountain area of southern margin of North China Carton，where magmatic activity were rare. Because of lack of age and petrogenetic investigation of the Mesozoic dike rocks， its formation age and origin would be investigated by LA-ICPMS zircon U-Pb dating and element geochemistry. The dike rocks in Sishilichang Mountain area consist of lamprophyre，granite porphyry and syenite rocks，whose emplacement ages were 80.9±1.8 Ma，86.1±1.0 Ma and 85.5±1.4 Ma respectively. The dike rocks constitute Late Cretaceous bimodal intrusive rock for similar age and components of basic and acid endmembers， and the acid endmembers belong to A-type granites. The lamprophyres of basic dike rocks were derived by partial melting of enrichment lithospheric mantle source，which were contaminated by materials of subducted ancient crust of Yangtze Craton and asthenosphere mantle since its contained ～416 Ma inherited zircons and was close to sodic type. While the acid dike rocks were derived mostly from crust-derived magma， which were formed from melting crustal materials heated by underplating of mantle-derived basic magma， as well as their mixed magma. Combined spatial distribution characteristics of Late Cretaceous igneous rocks in eastern China and Northeast Asia，it was suggested that the bimodal dike rocks in Sishilichang Mountain area formed under back-arc intraplate extensional setting related to the subduction of the paleo-Pacific plate.
Li Zhensheng,Niu Hao,Zhang Yan et al. Preliminary study on zircon U-Pb dating and petrogenesis of Mesozoic dike rocks in Sishilichang Mountain area of southern margin of North China Carton[J]. Chinese Journal of Geology, 2016, 51(4): 1137-1162.