摘要
Recent geophysical surveys and basin modeling suggest that the No.1 fault in the Ying- gehai basin (YGHB) is the seaward elongation of the Red River fault zone (RRFZ) in the South China Sea (SCS). The RRFZ, which separates the South China and Indochina block, extends first along the Yuedong fault, offshore of Vietnam, and then continues southward and breaks off into two branches: the Lupar fault and the Tinjia fault. The southern extension of the Lupar fault dies out beneath the NW Borneo while the Tinjia fault extends southeast and reaches the Brunei-Sabah area. According to the gravity and geomagnetic data, and the tectonic evolution of the basins, there are different evolution histories between the Wan’an basin (WAB) and the basins in the Nansha block. The Tinjia fault may be the boundary between the Balingian block and the Nansha block. Hence, the line linking the Yue- dong fault and the Tinjia fault, which both are continental margin faults and strike-slip ones in the geological evolution histories, constitute the boundary between the Indochina and Nansha block. The Lupar fault, in contrast, is an intraplate fault within the Indochina block. The results provide new hints for reconstructing the tectonic evolution history of the RRFZ and the opening of the SCS, and also a framework for hydrocarbon prospecting in the region.
Recent geophysical surveys and basin modeling suggest that the No.1 fault inthe Ying-gehai basin (YGHB) is the seaward elongation of the Red River fault zone (RRFZ) in theSouth China Sea (SCS). The RRFZ, which separates the South China and Indochina block, extends firstalong the Yuedong fault, offshore of Vietnam, and then continues southward and breaks off into twobranches: the Lupar fault and the Tinjia fault. The southern extension of the Lupar fault dies outbeneath the NW Borneo while the Tinjia fault extends southeast and reaches the Brunei-Sabah area.According to the gravity and geomagnetic data, and the tectonic evolution of the basins, there aredifferent evolution histories between the Wan''an basin (WAB) and the basins in the Nansha block. TheTinjia fault may be the boundary between the Balingian block and the Nansha block. Hence, the linelinking the Yuedong fault and the Tinjia fault, which both are continental margin faults andstrike-slip ones in the geological evolution histories, constitute the boundary between theIndochina and Nansha block. The Lupar fault, in contrast, is an intraplate fault within theIndochina block. The results provide new hints for reconstructing the tectonic evolution history ofthe RRFZ and the opening of the SCS, and also a framework for hydrocarbon prospecting in the region.
作者
LIU Baoming1,2,3, XIA Bin1, LI Xuxuan1,3, ZHANG Minqiang1,3, NIU Binhua2, ZHONG Lifeng1, JIN Qinghuan1,4 & JI Shaocheng1,5 1. Key Laboratory of Marginal Sea Geology and Resources, Chinese Academy of Sciences,Guangzhou 510640, China
2. China University of Geosciences (Beijing), Beijing 100083, China
3. Research Center of Science & Technology Department, CNOOC, Beijing 100027, China
4. Guangzhou Marine Geological Survey, Ministry of Land & Resources, Guangzhou 510075, China
5. Ecole Polytechnique Montreal, H3C3A7, Canada
基金
This work was jointly supported by the Knowledge Innovation Program of the CAS(Grant No.KZCX2-SW-117-03)
the Foundation of Key Laboratory of Marginal Sea Geology and Resources of the CAS(Grant No.MSGL04-6)
the Program of Guangzhou Institute of Geochemistry of the CAS(Grant No.GIGCX-03-07)
the National Natural Science Foundation of China(Grant No.40306010).
