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南海海域主体可划分为南海北缘、中西沙、南沙、南海海盆四块 ,各块具有明显不同的重磁场特征 .反演得到的莫霍面总体趋势由陆向洋抬升 ,反映陆壳、拉伸陆壳、过渡壳、洋壳的分布 .东沙高磁异常含一定的高频成份 ,与新生代玄武岩及中生代岩浆岩有关 ,而其低频成份可能反映了发育的下地壳高速层 .南海海域断裂极为发育 ,可分为北东向断裂组、东西向断裂组、北西向断裂组和南北向断裂组 .南海北缘、南缘均以北东向张性断裂与北西向张剪性、剪性断裂为主要格架 ,形成了“南北分带、东西分块”构造格局 .
The main body of the South China Sea can be divided into four parts: the northern margin of the South China Sea, the Central and Western Shahe, the Nansha and the South China Sea basins, with distinctly different characteristics of heavy and magnetic fields in each block.The retrieved general trend of the Moho is from the ocean to the ocean, reflecting the continental crust, Continental crust, transitional crust and oceanic crust.High magnetic anomalies in the East Shahei contain certain high-frequency components related to Cenozoic basalts and Mesozoic magmatic rocks, while their low-frequency components may reflect the development of the lower crustal high-velocity crust. And can be divided into north-east fracture group, east-west fracture group, north-west fracture group and north-south fracture group.The northern and southern margins of the South China Sea are characterized by north-east tensional fracture and north-west shear and shear fracture As the main framework, formed a “north-south zoning, east-west block” structure pattern.