NUMERICAL SIMULATION OF MESOZOIC TECTONIC PROCESSES IN THE SOUTHERN PART OF EAST CHINA SEA CONTINENTAL SHELF BASIN

The I2VIS finite difference and mark-in-cell technique is used to simulate the evolution of Mesozoic basins in the southern part of the East China Sea Continental Shelf Basin. The numerical model was constructed based on the existing seismic profiles, drilling and tomographic data of the study area. Based on the simulation results, the magmatic intrusion and sedimentation during the basin evolution are quantitatively analyzed under different boundary conditions, and the main factors affecting the tectonic evolution of the basin are discussed. As the results, following conclusions are obtained: 1) The change of the boundary conditions for the models indicates that the stratified aquifer mantle will destroy the crustal structure under tensile environment, and the regional extension of the Mesozoic East China Sea Continental Shelf Basin is not the only master factor to the basin evolution. 2) Mesozoic basins are closely related to the material flow in upper mantle during the Mesozoic Era. 3) The large-scale magmatic events caused by the Mesozoic mantle flow are likely to affect the Minjiang Depression, leading the Depression turning to uplift, the formation of the present-day slope zone, and further settling of the Jilong Depression to become a depression center. The regional evolution and magma upwelling caused by the upper mantle flow have indeed influenced the evolution of the Mesozoic basin in the southern part of the East China Sea Continental Shelf Basin.