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The geological and paleomagnetic investigations suggest that the blocks in South China, except for those rifted from late Paleozoic Gondwana such as the Shan-Thai-Malay and Hainan blocks, were separated by restricted back-arc basins not by large oceans. Most of these basins were probably collapsed in the early Mesozoic, leaving a few remnants of deep water sediments in the melange zones. South of the back-arc basins and remnant arcs lies a magmatic frontal arc which could be traced from the Lincang arc in eastern Yunnan to the Malay Peninsula and Borneo, and northward to coastal Fujian and probably to Japan. These arc terranes and back-arc basins might have formed an archipelago in Permo-Triassic time, an ancient analogue of Southeast Asia today.
The geological and paleomagnetic investigations suggest that the blocks in South China, except for those rifted from late Paleozoic Gondwana such as the Shan-Thai-Malay and Hainan blocks, were separated by restricted back-arc basins not by large oceans. Most of these basins was probably collapsed in the early Mesozoic, leaving a few remnants of deep water sediments in the melange zones. South of the back-arc basins and remnant arcs lies a magmatic frontal arc which could be traced from the Lincang arc in eastern Yunnan to the Malay Peninsula and Borneo, and northward to coastal Fujian and probably to Japan. These arc terranes and back-arc basins might have formed an archipelago in Permo-Triassic time, an ancient analogue of Southeast Asia today.