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The mechanics of continental extension in Qiongdongnan Basin, northern South China Sea
Zhao, Zhongxian1; Sun, Zhen1; Wang, Zhenfeng1; Sun, Zhipeng1; zhensun@scsio.ac.cn
2015
Source PublicationMARINE GEOPHYSICAL RESEARCH
Volume36Issue:2-3Pages:197-210
AbstractLocated in the intersection of NE-trended rifted margin of South China Sea (SCS) and NW-oriented Ailao Shan-Red River Shear Zone (RRSZ), Qiongdongnan Basin shows significant differences in geological features from west to east, indicating different mechanics of continental extension. Based on the dense and updated multichannel seismic profiles, we disclose the characteristics of the remnant crystalline crust. Besides, we analyze the basin structures, calculate the stretching factors of upper and whole crust, and compute the syn-rift and post-rift unloaded tectonic subsidence along three selected transects in the west, middle and east of Qiongdongnan Basin. The crust thickness is 22 km on the northern and southern parts of Qiongdongnan Basin and thins gradually towards the central depression with two extremely thinned domains (<4 km), of which one is in Ledong Sag in the west and another is in Baodao and Changchang Sags in the east. Correspondingly, the stretching factors of crust are 1.5-2 on both sides and increase remarkably towards the central depression (beta > 2) with two extremely stretched domains (beta > 9), of which one is in Ledong Sag in the west and another is in Baodao and Changchang Sags in the east. However, the mechanics of continental extension vary significantly from west to east. The simple shear dominates in the west, the pure shear dominates in the east, and it is intermediate between the two end members of simple shear and pure shear in the middle of Qiongdongnan Basin. The simple shear in the west of Qiongdongnan Basin is probably controlled by the left-lateral movement of RRSZ. The pure shear in the east is probably related to the Cenozoic rifting along the northern continental margin of SCS. The transitional zone in the middle of Qiongdongnan Basin is possibly the combined results of the left-lateral movement of RRSZ and the Cenozoic rifting along the northern continental margin of SCS.
DepartmentLMB
KeywordContinental Extension Simple Shear Pure Shear Qiongdongnan Basin South China Sea
Subject AreaGeochemistry & Geophysics ; Oceanography
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Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/14786
Collection中科院海洋生物资源可持续利用重点实验室
Corresponding Authorzhensun@scsio.ac.cn
Affiliation1.[Zhao, Zhongxian
2.Sun, Zhen] Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China
3.[Wang, Zhenfeng
4.Sun, Zhipeng] CNOOC Ltd, Zhanjiang Branch, Zhanjiang 524057, Peoples R China
Recommended Citation
GB/T 7714
Zhao, Zhongxian,Sun, Zhen,Wang, Zhenfeng,et al. The mechanics of continental extension in Qiongdongnan Basin, northern South China Sea[J]. MARINE GEOPHYSICAL RESEARCH,2015,36(2-3):197-210.
APA Zhao, Zhongxian,Sun, Zhen,Wang, Zhenfeng,Sun, Zhipeng,&zhensun@scsio.ac.cn.(2015).The mechanics of continental extension in Qiongdongnan Basin, northern South China Sea.MARINE GEOPHYSICAL RESEARCH,36(2-3),197-210.
MLA Zhao, Zhongxian,et al."The mechanics of continental extension in Qiongdongnan Basin, northern South China Sea".MARINE GEOPHYSICAL RESEARCH 36.2-3(2015):197-210.
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