Initial rifting process and dynamics mechanism of Huaguang Sag: Evidence from a numerical modeling method

Zhourong Cai; Bin Xia; Baofeng Lü; Weiqi Yao; Jianfeng Li

doi:10.1007/s12583-014-0502-y

Volume 26 Issue 3

Jul 2015

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Journal of Earth Science > 2015 > 26(3): 399-406.

Zhourong Cai, Bin Xia, Baofeng Lü, Weiqi Yao, Jianfeng Li. Initial rifting process and dynamics mechanism of Huaguang Sag: Evidence from a numerical modeling method. Journal of Earth Science, 2015, 26(3): 399-406. doi: 10.1007/s12583-014-0502-y

Citation:

Zhourong Cai, Bin Xia, Baofeng Lü, Weiqi Yao, Jianfeng Li. Initial rifting process and dynamics mechanism of Huaguang Sag: Evidence from a numerical modeling method. Journal of Earth Science, 2015, 26(3): 399-406. doi: 10.1007/s12583-014-0502-y

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Initial rifting process and dynamics mechanism of Huaguang Sag: Evidence from a numerical modeling method

doi: 10.1007/s12583-014-0502-y

Zhourong Cai^{1, 2, 3
,
,},
Bin Xia^{1, 2, 3},
Baofeng Lü^{1, 2, 3},
Weiqi Yao^{1, 2, 3},
Jianfeng Li⁴

1.
School of Marine Sciences, Sun Yat-Sen University, Guangzhou 510006, China
2.
Research Institute of Offshore Oil and Mineral Resources Exploration and Development, Sun Yat-Sen University, Guangzhou 510006, China
3.
Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou 510006, China
4.
State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China

More Information

Corresponding author: Zhourong Cai, czhrsy@qq.com
Received Date: 07 Mar 2014
Accepted Date: 03 Jul 2014
Publish Date: 01 Jun 2015

Abstract

Abstract

Huaguang Sag is located in the deep seawater area of Qiongdongnan Basin, and its tectonic position belongs to the intersection of NE-trending, SN-trending and NW-trending tectonic systems in the continental margin of the Northwest South China Sea. To investigate the initial rifting process and further more the dynamics mechanism of Huaguang Sag, this paper sets up the structure model of basement which mainly makes up with several depression-controlling faults, and simulates the initial rifting process of Huaguang Sag by the FLAC software. The simulation results show that only affected by the S-N trending extensional stress, the rifting center appears in northern boundary basement faults (two NEE-trending and NWW-trending faults) of Huaguang Sag while does not take place at the NNE-trending and NE-trending basement fault zone in the middle sag, and doesn't match the current pattern that the basement fault plays a main role in controlling the sediment. In the other case, affected by the S-N trending and E-W trending extensional stress at the same time, the areas of the northern boundary faults zone and internal NNE-trending basement faults zone come to be rifting center quickly, the sedimentary is controlled by the main basement faults to different degrees, and is consistent with the tectonic-sedimentary framework of Huaguang Sag which obtained by the data of geophysical interpretation. In combination with the analysis of regional tectonic background, the paper proposes that two remote tectonic effects occurred by the collision of India-Eurasian Plate: One remote effect was the rotational extrusion of IndoChina Block, which led to form a series of NE-trending and NNE-trending basement faults, as well as the E-W trending tensile stress field in Huaguang Sag. The other remote effect was that the deep mantle material of South China Block flowed southward, which resulted in the S-N trending extensional rifting of the lithosphere in northern South China Sea, and finally formed a series of EW-trending and NEE-trending basement faults and the S-N trending tensile stress field in Huaguang Sag. Affected by the above tensile stress fields and the basement faults, the initial rifting occurred in E-W and nearly S-N directions along the pre-existed basement faults (the weak structural zones) in Huaguang Sag.
- Huaguang Sag,
- initial rifting process,
- numerical simulation,
- the South China Sea

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References(33)

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