The Forming Factors and Evolvement of the Mesozoic and Cenozoic Basin in the East China Sea

The paper discusses the forming factors and structural evolvement of Mesozoic and Cenozoic basins in the East China Sea. It makes detailed discussion on the influence of dynamics on the forming factors and structural evolvement of the basins, the dynamic features of the basin evolvement, geologic features of Okinawa Trough and its forming factors, and the volcanic arc formed by the dive of Pacific plate to Asia-Europe plate. It is thought the East China Sea Geosphere is the extension of the continent of East China to the sea and Okinawa Trough is the area where crust and geosphere thinned down suddenly. The outstanding characteristic of the trough is the temperature of the thermal flow is very high and varies greatly. The structural evolvement of Philippine Sea influences the formation of the northern part of Okinawa Trough and the collision of arc and continent in the east Taiwan of China influences the southern part, while the Longjing movement in the East China Sea continental shelf is the result of the pull-apart of the Okinawa Trough. The following conclusions are drawn through study: the occurrence, development and evolvement of the East China Sea Basin is effected by the collision, dive, and pull-apart of Asia-Europe plate to Pacific plate, the collision, wedge, and upwarp of the India plate to Asia-Europe plate, and the arc-continent collision between Taiwan of China and Phillipine; there are two sedimentary basins of different times, different type, different structure, different forming factor and evolvement history; Okinawa Trough is an unique structural unit in the east of Asia-Europe plate, a basin behind the arc caused by the dive of the Pacific plate to the Asia-Europe plate, and a rift valley in the margin of continent; the northern part of Okinawa Trough formed earlier than the southern part, and the northern part was pulled apart while the southern part pulled apart.