Evolution of Sedimentary Basins in China during Mesozoic

Based on the comprehensive analysis of the sedimentary basin distribution, filling sequences, lithofacies palaeogeography in the three periods of T_1-2, T₃-J₁, J₂-K in Mesozoic, the spatiotemporal revolution characteristics of the sedimentary basins during Mesozoic are summarized, the response relationship between the tectonic movement and the space-time revolution of the sedimentary basins during Mesozoic are discussed. And the conclusions as follows are drawn. (1) Along with the subduction of the Paleo-Asia ocean and the forming of the Tianshan-Xingmeng orogenic belt, the northern China was generally in a stage of landmass collision, and the basin-mountain pattern of northwest area also basically finalizes. In the south, a series of back arc oceanic basins in the north Qiangtang-Sanjiang archipelagic arc-basin system died off successively results from the two-way subduction of the Paleo-Tethys ocean. (2)The Indosinian movement in Late Triassic made the Paleo-Asia come to final solidification and outward expansion, and large-scale regression in south made most areas in China enter an intracontinental evolution phase. After the Indosinian movement, the west paleo-Mediterranean region and the east Paleo-Pacific were separated by the uplift of the central South China. (3) Since Middle Jurassic, the whole eastern China was involved in Pacific tectonic process, and the active continental margin of West Pacific Ocean formed affected by the Pacific Plate sliding beneath the Eurasian Plate. Most of the Northeast China developed iintra-arc rift (volcanic sedimentary) basin, while the North China continental block and the Alashan land block became divided. The mid-west area mainly consists of compressional basins, rift basins or depression basins, and the east developed intra-arc rift basins of epicontinental magma arc.In South China, drawing the Xuefeng Mountain as borderline, the east also developed iintra-arc rift basins related to the evolution of epicontinental magma arc, while the west developed large intracontinental compressional basins, rift basins or depression basins. The southwest area was still in a archipelagic arc-basin system pattern.