TECTONIC EVOLUTION AND MINERALIZATION CONSTRAINTS IN NORTHEAST CHINA

Northeast China, located at the convergence of North China plate, Siberian plate and Western Pacific plate, is an important area for studying the composite orogeny and mineralization of North China Craton, Paleo-Asian Ocean tectonic domain and Paleo-Pacific tectonic domain, and also one of the key regions of strategic mineral resources prospecting due to its superior metallogenic geological conditions. Since 2011, China has continuously strengthened the basic geological survey and research work in Northeast China, carrying out a series of 1:50 000 regional geological and mineral surveys, metallogenic background and comprehensive studies in the main metallogenic belt, basin-mountain junction belt and resources base in the area, to ensure the sustainable development of resources and energy and solve major basic geological problems. Lots of basic and original geological achievements have been made, which have successively filled the blank of large-scale geological surveys in Northeast China. Relying on the Regional Geology of Northeast China project, the study systematically sorts out the new data and results obtained from the basic geological survey projects since 2011, and summarizes the main basic geological research and achievements in Northeast China. On this basis, the tectonic units of North China Craton and Xing'an-Mongolian orogenic belt are further decomposed, which have restored the tectonic evolution history of the Paleo-Asian Ocean, Okhotsk Ocean and Paleo-Pacific Ocean, and completed the tectonic framework of Northeast China. With the discussion of the tectonic constraints on regional mineralization, the results will provide basic geological support for the new round of prospecting breakthrough strategic action.