GEOLOGIC CHARACTERISTICS AND EMPLACEMENT MECHANISM OF THE LYUSHAN GRANITE IN LIAONING PROVINCE

The Lyushan intrusive bodies are located in the east part of Tianshan-Xingan-Mongolia orogenic belt on the northern margin of the North China plate, generally trending in NNE direction. The interaction between North China plate and Jiamusi-Mongolia plate in early stage probably provides heat and space for the formation of the rock bodies. The later interaction between the North China plate and the Pacific plate makes the final emplacement of magma. In the early compression stage, the orogeny makes thickened crust. Then, the stretching process, with delamination performed by mantle heat, makes the crust thinning, forming the Lyushan metamorphic core complex and the fault basins in the east and west sides.