论南海新生代的构造运动

On tectonic movement in the South China Sea during the Cenozoic

白垩纪末和新生代之交的构造运动揭开了新生代南海多旋回构造运动的序幕,自此之后整个南海的地壳开始进入总体受张性背景区域构造应力场控制、以张性沉降为主要特征的地质发展时期.七次区域性的构造运动和沉积作用具有多旋回、周期性振荡式发生的特点,其中尤以白垩纪末和老第三纪初、晚始新世和中渐新世及中中新世和晚中新世之间的三次构造运动表现最为强烈,形成了南海最为重要的三个区域性构造界面.南海地壳运动是欧亚、太平洋和印度—澳大利亚三大板块相互作用效应的结果和缩影,是跨越太平洋和印度—澳大利亚两大板块更大范围的岩石圈和软流圈流动(运动)方向、速度和强度的周期性振荡式改变所导致的.

The tectonic movement at the end of Cretacious and the beginning of Cenozoic had opened the Cenozoic phase of polycyclic tectonic movement, then the whole crust of the South China Sea had been mainly subjected to the regional stress field of tectonic tension, which was characterized by rifting depression. Seven times of regional tectonic movement and sedimentation had been assembled into a geological development history of polycyclic oscillatory. Especially, the tectonic movement was strongly intensified at the end of Cretacious and the beginning of Paleagene, between the Late Eocene and the Mid-Oligocene, during the Mid-and Late Miocene. These three times of tectonic movement had built the most important regional tectonic interfaces in the South China Sea. Crust movement of the South China Sea was the result and epitome of interaction of the Eurasia, Pacific and Indo-Australia plates, that is, they were introduced by polycyclic changes of directions, rates and strengths of lithospheric movement and asthenospheric flow covering across the Pacific and Indo--Australia plates.