【作者】 林长松； 高金耀； 阮爱国； 谭勇华；

【Author】 LIN Chang-song, GAO Jin-yao, YUAN Ai-guo,TAN Yon-ghua Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou, 310012, China; Second Institute of Oceanography, State Oceanic Administration, Hangzhou, 310012, China

【机构】 国家海洋局第二海洋研究所；

【摘要】 南海西缘断裂带的主断裂是一条形成于中生代的基底断裂,在新生代持续活动扩展为右行走滑活动断裂带。断裂带内无磁性的高密度火成岩体属于印支期或燕山第一、四、五期之中的某一期花岗岩侵入体,很可能是燕山晚期的产物。新生代以来太平洋板块运动方向的逆时针旋转和周期性改变产生了扭张和变化的区域应力场,在其作用之下南海亚板块与印支亚板块之间产生了差异运动;断裂带的右行走滑活动及其变化是这种差异运动的边缘地质调节效应。南海西缘断裂带的基底主断裂在万安盆地的延伸段位于盆地中部;该主断裂的右行走滑活动引发了盆地沉降和盆地边缘断陷,万安盆地东缘断裂带由此形成。更多还原

【Abstract】 The main fracture of the western margin fault zone of the South China Sea is originated from the Mesozoic basement fault, continuously developed into dextral strike-slip fault zone in Cenozoic. The non-magnetic, high-density igneous rocks belong to granite of one period among the Indosinian or Yanshanian I, IV and V phase, which is most possibly at at the late Yanshanian . Since Cenozoic the anticlockwise rotation and cycle variation of the Pacific plate movement have made the anticlockwise-torsional and variational region stress field, which lead to the differential movement between the South China Sea sub-plate and the Indosinian sub-plate, and the dextral strike -slip and their variation of the western margin fault zone of the South China Sea is its. marginal geological-adjustment efficiency. The main basement fracture of the western margin fault zone of the South China Sea extends through the middle of the Wan’ an basin, and by its dextral strike-slipping have be induced the subsidence and the eastern margin fracture of the Wan’ an basin.更多还原