南海北部新生代的构造运动特征

Characteristics of tectonic movement in the northern part of South China Sea during the Cenozoic

新生代以来,南海北部陆架陆坡区及其邻区的地壳构造运动是在统一的区域构造应力场和总体区域性张裂沉降背景之下发生的,构造运动具有多旋回振荡式发生的特点,并贯穿了晚白垩世末之后的整个新生代.它的发生与太平洋板块的构造运动密切相关,这是由于太平洋板块之下的软流层流动方向和强度的振荡式改变而引发的.

Since the Cenozoic, crust tectonic movement in the northern continental shelf and slope and its surrounding of the South China Sea has occurred with an uniform regional tectonic stress field, which generally appeared as a regional rifting and sinking background. The tectonic movement was characterized by a kind of polycyclic-oscillatory change, which ran through the whole Cenozoic after the Late Cretaceous epoch. The tectonic movements keep close relation with the tectonic process of the Pacific plate and have been triggered by the oscillatory change of orient and intensity of asthenospheric flow under the Pacific plate.