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Crustal Tectonic Division and Evolution of the Southern Part of the North Asian Orogenic Region and Its Adjacent Areas

LI Jin-yi1,ZHANG Jin2,YANG Tian-nan1,LI Ya-ping3,SUN Gui-hua4,ZHU Zhi-xin5,WANG Li-jia11.Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China2.Institute of Geology,China Earthquake Administration,Beijing 100029,China3.Center of Development and Research,China Geological Surveys,Beijing 100037,China4.Guangzhou Marine Geological Survey,Ministry of Land and Resources,Guangzhou 510760,China5.Geological Research Academe of Xinjiang,Urumqi 830011,China  
Based on plate tectonics theory and synthesis of available geological and geophysical data,the authors suggest that the southern part of Northern Asian orogenic region should be divided into five paleoplates,i.e.Siberian,Kazakstan,Burean-Jiamusi,Tarim and Sino-Korean paleoplates,and each of them may be further subdivided into paleo-intracontinental and paleo-pericontinental regions.And then,composition and evolution of those paleo-plates,and several other issues such as Mongolian arch tectonics,basement of Junggar basin,and tectonic division of Beishan area and its connection to adjiacent areas are briefly discussed.Some new ideas are put forwards,which include that the Inner Mongolian geological axis should be a composite orogenic belt,that the Mongol-Okhotsk orogenic belt is not a suture between paleoplates,that there was a Great North China continent in the Late Paleozoic,and that precursors,paleo-oceans include the Paleo-Pacific ocean which occurred following the super-continental disintegration in the Early Meso-Proterozoic and the Paleo-Asian ocean opened in the Late Neoproterozoic.
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