MESOPROTEROZOIC OROGENIC BELT IN THE EAST PART OF THE NORTHERN MARGIN OF NORTH CHINA PLATE: Geologic Characteristics and Tectonic Evolution

The Weijiagou rock group, originally a suite of carbonate rocks, clastic rocks and volcanic rocks, was formed during the continental rift-active continental margin stage, with metamorphism and deformation occurred in 1036 Ma. Based on the the tectonic environment discrimination of magmatic rocks, the Mesoproterozoic magmatism of the studied area lasted throughout the pre-, syn-and post-collision periods. Accompanying with the evolution of orogenic belt, this region suffered three times of ductile deformation, which separately formed in the stages of continental rift, active continental margin and collision-orogeny. Research has determined the existence of the Mesoproterozoic orogenic belt in the studied area, which experienced the process of continental rift, passive continental margin, active continental margin and collision-orogeny. It is also confirmed that the Grenville orogeny took place in the northern margin of North China plate and responded to the convergence of Rodinia super continent in late Mesoproterozoic.