REGIONAL TECTONIC EVOLUTION AND GEODYNAMICS IN JIANPING AREA, WESTERN LIAONING PROVINCE

Based on the sediment formation, metamorphism, magmatic activity and structural deformation, the tectonic evolution in Jianping area of the Western Liaoning Province is divided into four stages, i.e. 1) the formation stage of craton basement (Neoarchean to the end of Paleoproterozoic); 2) the development stage of craton cover (from the beginning of Mesoproterozoic to the end of Paleozoic); 3) the orogenic stage of intra-plate (end of Late Paleozoic to Mesozoic) and 4) the development of neotectonism (since Paleogene). The Lvliang Movement, Indosinian movement and Himalayan movement are the turning point of these evolution stages, while the Yanshanian movement eventually forms the present tectonic outline. The orogenic stage of intraplate can be subdivided into initial stage (end of Late Permian to Middle Jurassic) and the main stage (Late Jurassic to Late Cretaceous). The geodynamic characteristics indicate that the orogenic mechanism of the initial orogenic stage of intraplate is the intracontinental subduction resulted from the collision of Xing-Meng orogenic belt. The orogenic mechanism of the main stage is the continental marginal orogeny, which is obviously caused by the subduction of Pacific plate.