Radiolarian chert，as an important environmental indicator，is widespread in South China and adjecent areas. Based on its temporal and spacial distribution，two regions and one belt can be recognized. The southern region includes western and southeastern Yunnan as well as western and southern Guangxi. The Late Palaeozoic and Early Mesozoic radiolarian chert sequences occur there. Of which the chert belt in western Yunnan extends southward into Thailand and Malaysiya Peninsula，representing the main trend of the PalaeoTethys. The chert sequences in southeastern Yunnan as well as western and southern Guangxi indicate some branch marine basins of the PalaeoTethys. The northern region includes the centralnorth Guangxi and Guangdong, middle south Hunan and Jiangxi，as well as the middle and lower Yangtze areas. There the MiddleUpper Permian radiolarian cherts indicate the existence of deep basins along the Yangtze platform margin during that period and the seaway linked with the PalaeoTethys Ocean. The east belt appeared in the island arcs outside of the South China Sea and East China Sea，from the northern Balawan through the Ryukyu Islands to the inner belt of southwest Japan. There the Middle Permian to Upper Jurassic radiolarian chert sequences together with the palaeomagnetic evidences indicate a lowlatitude pelagic marine basin located to the south of South China during that time. Then the marine basin can be called “PalaeoSouth China Sea”. The opening of the PalaeoSouth China Sea might be the cause of the middleupper Permian orogeny happened in the Yunkai terrane and other places in southeast China. Its later development also resulted in Triassic and Jurassic palaeogeographic changes in southeast China. The fast northward movement of the Izanagi plate in the Pacific during the Late Jurassic caused the underthrusting and subducting of the PalaeoSouth China Sea and resulted in the extensive calcalkaline magmatism along the coast area of southeast China.
About author: Wu Haoruo, born in 1940, graduated from the Beijing College of Geology in 1962.Now he is a professor of the Institute of Geology， Chinese Academy of Sciences， and engages in palaeontology and stratigraphy.
Cite this article:
. IMPLICATIONS OF RADIOLARIAN CHERTFOR THE PALAEOGEOGRAPHY OF SOUTH CHINA[J]. JOURNAL OF PALAEOGEOGRAPHY, 1999, 1(2): 28-35.
. IMPLICATIONS OF RADIOLARIAN CHERTFOR THE PALAEOGEOGRAPHY OF SOUTH CHINA[J]. JOPC, 1999, 1(2): 28-35.
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