海洋地质与第四纪地质2017，Vol.37Issue(2)：82-98,17.DOI:10.16562/j.cnki.0256-1492.2017.02.009
南海中南—司令断裂带的延伸特征及其与南海扩张演化的关系
EXTENSION OF THE ZHONGNAN-SILING FAULT ZONE IN SOUTH CHINA SEA AND ITS BEARING ON SEAFLOOR SPREADING
摘要
Abstract
In order to detect the extension pattern of the Zhongnan-Siling fault zone in the oceanic basin,to define the southern margin of South China Sea,and to explore its relationship with the evolutionary history of seafloor spreading of the South China Sea,comprehensive geological and geophysical studies are made by the authors based on the data of gravity and magnetic anomalies,seismic profiles,depth of Moho,seismic P-wave velocity,drilling and dredging samples.The Zhongnan-Siling fault zone,which cuts down to the Moho-boundary,extends in N-S trend between the Eastern Sub-basin and Northwest Sub-basin along the southern margin of the South China Sea,and can be traced to the southern continental margin of the South China Sea.According to the variation in the trend of the magnetic anomaly belt in the oceanic basin of the South China Sea and the mutual relationship of the magnetic anomaly belt with the strike-slip or transform fault and the seafloor spreading direction,combined with previous research results on the "scissors-like" collision,seafloor spreading evolution and the tectonic stress of the South China Sea,the authors proposed in this paper that in the period of 32Ma to 25Ma,the South China Sea basin and the Nansha block had experienced a clockwise rotation along with the spreading of the Eastern Sub-basin in NNW trend,which caused the change in the direction of the Zhongnan-Siling fault from NNW in the early stage to N-S later on.After 23.5Ma,the clockwise rotation was stopped,while the Eastern Sub-basin continued to spread in NNW trend,the southwestern Sub-basin began spreading in a NW-SE trend with SW-ward propagation.The three crust-cutting deep faults,the Zhongnan-Siling fault,together with the other two regional crust-cutting deep faults,the Red River-East Vietnam fault and the Manila trench fault,formed a regional "slip line field",which constrained the seafloor spreading of the South China Sea and the southward drifting of the Nansha block.关键词
南海扩张/滑线场/古双峰-笔架碰撞造山带/新生代/中南—司令断裂带Key words
seafloor spreading of the South China Sea/slip line field/ancient Shuangfeng-Bijia collision orogenic belt/Cenozoic/Zhongnan-Siling fault zone分类
海洋科学引用本文复制引用
黎雨晗,刘海龄,朱荣伟,王印,周洋,徐子英..南海中南—司令断裂带的延伸特征及其与南海扩张演化的关系[J].海洋地质与第四纪地质,2017,37(2):82-98,17.基金项目
国家自然科学基金项目(41276048,91328205,41606080和41476039) （41276048,91328205,41606080和41476039）
中国海及邻域地质地球物理及地球化学系列图项目(GZH200900504-WX02) （GZH200900504-WX02）
