| China Geological Survey Chinese Academy of Geological Sciences | Host |
| 科学出版社 | Publish |
| Citation: |
XU Ziying, WANG Jun, GAO Hongfang, YAO Yongjian, ZHU Rongwei, TANG Jianglang, NIE Xin, SUN Meijing. 2020. The characteristics and formation mechanism of the faults in the southern part of the Zhongsha Bank[J]. Geology in China, 47(5): 1438-1446. doi: 10.12029/gc20200510
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The characteristics and formation mechanism of the faults in the southern part of the Zhongsha Bank
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Abstract
On the basis of the latest multi-channel seismic profiles and geophysical data such as gravity, magnetism and topography, the spatial distribution characteristics of faults, the development period of faults, the internal structural deformation feature of faults and deep crustal structure in the southern Zhongsha Bank (ZB) were revealed, and the formation mechanism of the faults was also discussed. The results show that the tectonic property of the southern continental margin of ZB is non-volcanic passive continental margin. From northwest to southeast, the crustal properties change from thinned continental crust to oceanic-continental transitional crust and then to normal oceanic crust. The depth of Moho discontinuity rises rapidly from 26 km beneath the ZB to 10-12 km beneath the ocean basin. The obvious negative gravity anomaly area from the steep slope of the ZB to the coast front is the oceaniccontinental transitional zone, and the boundary of gravity anomaly change from high value negative anomaly to low value positive and negative anomaly in the ocean basin is the oceanic-continental boundary. There are four sets of deep and large normal faults with stepped sea-dipping in the southern part of the ZB, which were mainly developed in the Late Oligocene to the Middle Miocene. The early extension of the fault development mechanism was related to the NS-trending extension of the sub-basin in the eastern South China Sea (SCS), and the later compressive stress was related to the NW-trending subduction of the Philippine plate towards the SCS. This study is helpful to the better understanding of the expansion history of the South China Sea basin and the types of passive continental margins in the SCS.
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References
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XU Ziying, WANG Jun, GAO Hongfang, YAO Yongjian, ZHU Rongwei, TANG Jianglang, NIE Xin, SUN Meijing. 2020. The characteristics and formation mechanism of the faults in the southern part of the Zhongsha Bank[J]. Geology in China, 47(5): 1438-1446. doi: 10.12029/gc20200510
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Figure 1.
Bathymetric map of the South China Sea (afterYang Shengqiong et al., 2015) and the location of study area
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Figure 2.
Bathymetric map of southern Zhongsha Bank, faults distribution and profile location (COB is continent-ocean boundary)
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Figure 3.
Seismic profile characteristics of southern Zhongsha Bank along survey line L1
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Figure 4.
Seismic profile characteristics of southern Zhongsha Bank along survey line L2
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Figure 5.
Seismic profile characteristics of southern Zhongsha Bank along survey line L3
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Figure 6.
Feature of the free-air gravity anomaly in southern Zhongsha Bank (The dashed pink line represents COB)
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Figure 7.
Feature of the magnetic anomaly in southern Zhongsha Bank (The dashed blue line represents COB)
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Figure 8.
Feature of the Moho interface burial depth in southern Zhongsha Bank
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Figure 9.
Seismic profile characteristics of fault fold and uplift in southern Zhongsha Bank (The dashed line frame is the fault fold area)