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A PRELIMINARY DISCUSSION ON THE RESEARCH OF LITH0SPHERE TECTONIC EVOLUTION 0F SOUTHEAST CHINA

Wang Zhi-hong1, LU Hua-fu2   

  1. 1. Institute Geology, Chinese Academy of Sciences, Beijing 100029; 2. Department of Earth Sciences, Nanjing University, Nanjing, 210093
  • Received:1997-03-20 Revised:1997-03-20 Online:1997-03-20 Published:1997-03-20

Abstract: Based on the latest tectonic theories and attainable data, the present authors put forward their own views about the research of lithosphere tectonic evolution of SE China.The concepts of terrane analysis and the mode1 of tectonic facies, as two methods of regiona1 tectonic analysis rooted in plate tectonics, are harmonious. The former contributes to clarify the composite units of orogenic belts and their origin and development, while the latter constructs the regular pattern of formation and evolution of orogenic belts. A synthetical study of the two methods is an effective and practicable thinking in research of orogenic belts of China. The Precambrian crust materials n SE China are some palaeoslabs from Gondwana and their re-cycled materials rather than autochthonous, and they call not constitute a unified Cathaysia old landmass. The four stages collisions between microcontinents or terranes respresented by these plaleoslabs, occurring in late Proterozoic, early Paleozoic, early Mesozoic and late Mesozoic respectively, formed the multiple orogenic belts in SE China. Detailed analyses of the four orogenic belts indicate that the concepts of Tethyan system or/and Pacific system can not give a perfect definition for their subduction polarities and senses of tectonics, especially n the existence of flake tectonics which would complicate the corresponding relationship between subduction polarity and sense of tectonics. It has been verified by the research of southeastern Pujian 1ate Mesozoic orogenic belt. Oblique collision and strike-slip are more common collisional styles between plate boundaries and have been regarded as basic property of orogenic belts. This has been affirmed by the identification of oblique collision and strike-slip in the multiple orogenic belts of SE China and other areas all over the world. The authors conclude that the research of flake tectonics, oblique collision and strike-slip will extend the study domain of orogenic belts and offer a new approach to reconstruct the relationship between plate kinematics and collisional dynamics.