THE CRUSTAL MOVEMENT CHARACTERISTICS OF LIAODONG PENINSULA IN EARLY CRETACEOUS EPOCH:Evidence from the Lanheyu intrusive rock

With study on the zircon SHRIMP U-Pb age and geochemical characteristics of the Lanheyu intrusive rock in Liaodong peninsula, the high-K calc-alkali series rock is proved to be formed in Early Cretaceous Epoch. According to the formation pressure of 0.8-1.0 GPa of the Lanheyu rock body in Benxi region, it is speculated that the source materials of granite magma came from 30-40 km deep below the thin crust. In the Rb(-Y+Nb) and Y-Rb diagrams of granite, all the samples fall into the WPG (within plate granite) area, concluding the Liaodong block was in the post-orogenic stage with lithosphere thinning, which reflected an extensional tectonic environment. The Lanheyu granite provides a favorable evidence for the extensional environment during the Early Cretaceous Epoch of Liaodong continental block.