【摘要】 通过对南海973航次在该区域的多道地震剖面的解释,并结合重力和磁力资料,发现台西南盆地的主要构造走向为NE-NEE向,沉积上具有独特的双层构造,是一个与南海演化密切相关的新生代伸展型断陷盆地.这个盆地早第三纪开始发育,形成了大量的正断层和由它们控制的一系列半地堑,发育了古新世-渐新世的沉积.渐新世末期盆地受到挤压作用影响,发育了一系列的逆冲断层和反转构造,表明了台西南盆地"先张后挤"的演化特征,从中新世开始进入热力学沉降坳陷发育阶段.更多还原

【Abstract】 Through the interpretation of the seismic profile across the NE South China Sea region, combined with the analysis of free-air gravity anomaly and magnetic anomaly, it was found that the Southwest Taiwan Basin’s structure is in NW-NEE direction and it has a special double-layer sedimentary style. It’s a Cenozoic rifty basin which has a close relationship with the evolution of the South China Sea. From the late Cretaceous the basin begun its rifting action. During the Paleogene, extensional structures, including normal faults and half-grabens controlled by them, developed and the basin was covered by the Paleocene, Eocene and Oligocene deposit. At the end of Oligocene the basin was influenced by contractive action and developed some thrust faults and inversion tectonics. The evolution character is "Extension first, contraction". After Miocene the basin began its thermal subsidence.更多还原