Deformation characters and its tectonic evolution of the Southwest Taiwan Basin
Deformation characters and its tectonic evolution of the Southwest Taiwan Basin
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发表时间：
2004
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通讯作者：
Ding Wei-wei
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作者：
Ding Wei-wei
通过对横跨南海东北部地区的地震剖面的解释，结合自由空间重力异常和磁异常的分析，发现台西南盆地的构造为NW-NEE向，具有特殊的双层沉积样式。它是一个与南海演化关系密切的新生代断陷盆地。从晚白垩世开始，盆地开始了裂陷作用。古近纪，伸展构造发育，包括正断层及其控制的箕状地堑，盆地被古新统、始新统和渐新统存款所覆盖。渐新世末盆地受收缩作用的影响，发育逆冲断层和反转构造。其演变特征是“先扩后缩”。中新世以后，盆地开始热沉降。
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.