地质学
裂谷
地震学
外延定义
断层(地质)
拆离断层
分手
伸展断层
海底扩张
海底管道
反射(计算机编程)
岩浆作用
大陆边缘
山脊
岩石学
古生物学
构造学
岩土工程
心理学
计算机科学
精神分析
程序设计语言
作者
Zhichao Zhou,Lianfu Mei,Jun Liu,Jinyun Zheng,Liang Chen,Shihao Hao
标识
DOI:10.1016/j.tecto.2018.02.002
摘要
The rift architecture and deep crustal structure of the distal margin at the mid-northern margin of the South China Sea have been previously investigated by using deep seismic reflection profiles. However, one fundamental recurring problem in the debate is the extensional fault system and rift structure of the hyperextended rift basins (Baiyun Sag and Liwan Sag) within the distal margin because of the limited amount of seismic data. Based on new 3D seismic survey data and 2D seismic reflection profiles, we observe an array of fault blocks in the Baiyun Sag, which were tilted towards the ocean by extensional faulting. The extensional faults consistently dip towards the continent. Beneath the tilted fault blocks and extensional faults, a low-angle, high-amplitude and continuous reflection has been interpreted as the master detachment surface that controls the extension process. During rifting, the continentward-dipping normal faults evolved in a sequence from south to north, generating the asymmetric rift structure of the Baiyun Sag. The Baiyun Sag is separated from the oceanic domain by a series of structural highs that were uplifted by magmatic activity in response to the continental breakup at ~33 Ma and a ridge jump to the south at 26–24 Ma. Therefore, we propose that magmatism played a significant role in the continental extension and final breakup in the South China Sea.
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