Prototypes of sedimentary basins in central and western China from Late Paleozoic to Middle Triassic

The formation and evolution of sedimentary basins were controlled by 4 important geologic events in central and western China from the Late Paleozoic to the Middle Triassic.1)From the Late Devonian to the Early Carboniferous,the Pal-Asia Ocean subducted.The giant Pal-Asian Landmass came into being when the Siberian Landmass had been connected with the Pal-China Landmass through the Tianshan-Yinshan Orogenic Belt.2)From Carboniferous to the Early Permian,influenced by mantle plumes,Tianshan(central Asia) large igneous rock province and several rift valleys generated in the giant Pal-Asian Landmass.3) From the Early Carboniferous to the Late Permian and the Middle Triassic,the Paleotethys Ocean expanded and the SES margin of the Pal-Asian Landmass detached.4) From the Late Permian to the Middle Triassic,the Emei Mantle Plume and several rift valleys generated.4 basin prototypes existed in central and western China from the Late Paleozoic to the Middle Triassic.1)Basins in the detaching margins of plates.They generated when the Paleotethys Ocean was expanding and mainly located in the northwestern and southern margins of South China Landmass as well as the southern margin of the Tarim Landmass.2)Basins in the convergent margins of plates.From the Late Permian to Triassic,they generated in the southern margin of the the South China Landmass.From the Middle and Late Devonian to Carboniferous,they developed in the northern margin of the North China Landmass.From Devonian to Carboniferous,they developed in one or both sides of the Central Orogenic Belt.3)Intracratonic basins,including intra-platform depressions,inter-platform faults and remaining marine basins.4)Rift valleys and aulacogens related to the Tianshan large igneous rock province and the Emei Mantle Plume.