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本文通过对南海北部大陆边缘东、西部新生代沉积盆地基底岩性特征、基底构造格局、地壳结构和基底沉降结构等方面的论述,分析了北部陆缘东西部的地质差异,探讨了这些差异产生的原因。认为南海北部陆缘东西部新生代沉积盆地发育于不同的构造单元上,在形成演化过程中,基底具有不同的沉降结构和构造活动性,而地壳结构的明显差异,揭示了东、西部沉积盆地形成内因的差异,东部盆地发育于拉张减薄的陆壳之上,并伴有地幔隆起与地壳的上拱作用,西部盆地则主要以地壳的裂陷作用为主。
In this paper, the geological features of the eastern and western parts of the northern continental margin are analyzed based on the lithologic characteristics of the basement, basement structure, crustal structure and basement subsidence structure of the sedimentary basins in the eastern and western margins of the northern continental margin of the South China Sea. The differences are also discussed s reason. It is believed that the Cenozoic sedimentary basins in the eastern and western margins of the northern South China Sea developed on different tectonic units. During the formation and evolution, the basement has different sedimentary and tectonic activities, and the obvious differences of the crustal structure revealed the sedimentary basins in the eastern and western sedimentary basins The formation of internal differences, the eastern basin developed in the extension of thinning continental crust, accompanied by mantle uplift and crustal arching, while the western basin mainly in the crustal rifting.