【摘要】 新的2′×2′卫星测高获得的水深数据表明,除了在南海中央海盆扩张脊附近分布有高耸、断续的近东西向海山链外,在南海深海平原上还存在一些北西向的连续线状凸起特征。这些线状特征高约500m,宽10-30km,绵延数百至近千公里。反射地震数据则显示,这些海底线状隆起实际上是宽50—100km的走滑断裂带,在该断裂带内还有一些低幅和隐伏褶皱,它们代表了海盆内部的压性走滑断裂带,反映了海盆扩张停止后台湾-吕宋岛弧向西的构造挤压应力对南海海盆的持续作用。其中一条穿过116°E的北北西向断裂带构成了中央海盆与西南海盆的边界断裂。更多还原

【Abstract】 New satellite-derived bathymetric data in 2′×2′ grid shows that besides the high, fragmented E-W-directed volcano chain in the spreading ridge of the South China Sea, there are also several NW- to NNW-directed continuous linear relief features which are 500 m high, 10—30 km wide and hundreds to one thousand kilometers long. Reflection data reveals that they are 50—100 km wide strike-slip fault zones in which low amplitude blind folds develop, and represent intra-oceanic basin transpressive faults zone resulting from lasting convergence by the Taiwan-Luzon Arc since the cessation of the seafloor spreading in the South China Sea. One fault zone crossing the 116°E longitude acts as the boundary between the central sub-basin and the SW sub-basin.更多还原