1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. Liaoning Survey Academy of Geology and Mineral Resources, Shenyang 110031, China

Through petrogeochemistry,zircon U-Pb geochronology in Huangniling pluton from the northeastern margin of North China craton, it is indicated that the Huangniling pluton is composed of pyroxene adamellite. It formed during the Early Middle Jurassic with a weighted mean age of 174±0.4 Ma. The major elements of the adamellite are characterized by high Al,Ca,Na,Fe and low Mg, with negligible Eu anomalies. Huangniling pluton is enriched in large ion lithophile elements(LILE)(e.g.,Rb,Sr,Ba,Th,U and LREE),and depleted in high field strength elements(HFSE)(e.g.,Nb,Ta,Zr,Hf,Ti and HREE) and compatible element V,Cr,Co and Ni. The adamellite in Huangniling belongs to C-type adakite with high Sr and low Yb. The Huangniling pluton magma was derived mainly from partial melting of mafic rocks in thickened lower crust. The wide distribution of the Middle Jurassic C-type Adakite in the eastern margin of the North China craton,such as the Huanglinling adamellite,indicates that at least since Middle Jurassic, the control of the Paleo-Asian ocean tectonic system on the study area has ended. The circum-Pacific tectonic system dominates the structural magmatism in this area.