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南海是亚洲东部的一个边缘海。从板块构造观点看来,南海及其周围整个东南亚大陆边缘恰好位于欧亚板块、太平洋板块和印度洋-澳大利亚板块交汇处,即处于一板块“三叉点”上。 根据此区域内已有的地球物理及地质资料,作者认为南海海盆是新生的边缘海板块而不是沉没的古老地台。 南海的形成是由于新生代早期在其两侧存在一背离式的板块“三叉点”所致,此“三叉点”的位置在海南岛南侧和印支半岛东侧。“三叉点”以东的地壳因局部海底扩张而被推向东,至菲律宾群岛一线,导致南海深海盆(所谓“中国盆地”)的张开和上地幔物质的上涌。 根据资料分析,作者认为南海海底扩张轴是北东向平行于大陆边缘的,扩张的时代是从渐新世晚期至中新世。
The South China Sea is a marginal sea in eastern Asia. From the plate tectonic point of view, the South China Sea and its surroundings are all located exactly at the Eurasian Plate, the Pacific Plate and the Indian Ocean-Australia Plate Exchange at the periphery of the South China Sea and its surroundings. According to the existing geophysical and geological data in this area, the author thinks that the South China Sea basin is a newborn edge sea plate instead of a sunken old platform. The formation of the South China Sea is due to the existence of a divergent plate “triad” on both sides of the early Cenozoic. The “triad” is located on the south of Hainan Island and east of Indochina Peninsula. The crust east of the “Three Forks” was pushed east by partial seafloor expansion to the Philippine archipelago, leading to the opening up of the South China Sea Deep Basin (the so-called “China Basin”) and the upwelling of the upper mantle. According to the analysis of the data, the authors believe that the expansion axis of the South China Sea submarine is parallel to the edge of the continental margin to the northeast, extending from the late Oligocene to the Miocene.