中国南大陆古地理与Pangea对比

中国南大陆为一构造古地理名称，在地理上包括昆仑、秦岭山脉以南的广大地区，泛称中国南方。这些地区在地质历史演化中分属于扬子陆块、华夏陆块、羌塘－昌都陆块、中咱微陆块，也包括由冈瓦纳陆块群裂解出来的拉萨陆块和印度陆块北缘的江孜地区。塔里木陆块和紫达木陆块在中国古大陆的聚合中裂解、漂称，在早古生代末脱离扬子陆块的群体，与华北陆块聚合，因此，中国南大陆古地理的重建，不仅涉及南方各块体的聚合，还涉及中国古大

PALAEOGEOGRAPHY OF THE SOUTH CHINA CONTINENT AND ITS CORRELATION WITH PANGEA

Palaeogeographically the South China palaeocontillent represents the extensive region of the southern parts of the Kunlun and Qinling Mountains,and is generally named South China. It includes the Yangtze, Cathaysian, Qiangtang-Qamdo landmasses as well as the Lhasa landmass separated from the Gondwana lalidmass group,and the Gyangze region onthe northern margin of the indian landmass. In the convergence of the China palaeocontinent,the Tarim and Qaidam landmasses were separated from the Yangtze landmass groupand drifted to converge with the North China landmass at the end of the Early Palaeozoic.The subduction of the oceanic crust and the convergence of the landmasses have thefeatures of multistage development and the processes of collision and inlay in the form ofpoint,line and surface. The South China palaeocontinent underwent three stages of evolution. The first stage covers the late Late Proterozoic to Early Palaeozoic,when the PanYangtze landmass group was regulated for the first time. The isolated Tarim and Qaidamlandmasses were split from the western Yangtze landmass. Meanwhile,the eastern Yangtzelandmass was converged with the Cathaysian landmass to form the South China palaeolandmass,and further to come into collision with the extended North China landmass atone point. In the second stage during the Late Palaeozoic,the Pan-Yangtze landmass group was broken up, and the narrow Jinshajiang ceanic basin extended. The Qiangtang-Qamdoand Zongza laadmasses were separated from the Yangtze landmass. The third stage beginswith the Ladinian (Middle Triassic). Due to the subduction of the western Palaeo-PacificOcean, the migration of the South China landmass from east to west and the south-and northward subduction of the remnant Bayan Har oceanic basin,the epicontinental arc was formed along the Kunlun-West Qinling Mountains in the northern part,and the island-arc zone occurred along the Jinshajiang-Yushu region in the southern part. Then the Bayan Har sea basin was infilled and disappeared to transform into a foreland basin,resulting in the formation of the obductively orogenic zone on the western margin of the South Chinalandmass. However, the Lhasa landmass and Gyangze region were converged with theSouth China landmass during the late Late Mesozoic to Tertiary.