The dynamic mechanism of post-rift accelerated subsidence in Qiongdongnan Basin, northern South China Sea

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 中科院边缘海地质重点实验室

	The dynamic mechanism of post-rift accelerated subsidence in Qiongdongnan Basin, northern South China Sea
	[Zhao, Zhongxian ; Sun, Zhen ; Liu, Jianbao ; Sun, Longtao] Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China ; [Sun, Zhipeng] Zhanjiang Branch CNOOC Ltd, Zhanjiang 524057, Peoples R China
刊名	MARINE GEOPHYSICAL RESEARCH
	2013
卷号	34 期号:41702 页码:295-308
关键词	Accelerated subsidence Unloaded tectonic subsidence Lower crust thinning Depth-dependent crust thinning Qiongdongnan Basin
ISSN号	0025-3235
通讯作者	zxzhao@scsio.ac.cn
中文摘要	A 1-D unloaded tectonic subsidence (air-loaded tectonic subsidence) model is proposed and applied to the Qiongdongnan Basin. Results show that three episodes of subsidence exist in Cenozoic, that is, syn-rift rapid subsidence (Eocene-Oligocene) with subsidence rate at 20-100 m/m.y., post-rift slow thermal subsidence (early-middle Miocene) around 40 m/m.y., and post-rift accelerated subsidence (since late Miocene) 40-140 m/m.y., which is substantially deviated from the exponentially decayed thermal subsidence model. For exploring the mechanism of post-rift accelerated subsidence, the faulting analyses are conducted and results show that there is a dramatically decrease in the numbers of active faults and fault growth rate since 21 Ma, which indicates that no active brittle crust extension occurred during post-rift period. Furthermore, previous studies have demonstrated that the stretching of the upper crust is far less than that affecting the whole crust. Therefore, we infer that the lower crust thinned during the post-rift period and a new model of basin development and evolution is put forward to explain the post-rift accelerated subsidence and depth-dependent crust thinning in the Qiongdongnan Basin, which is supported by gravity data.
学科主题	Geochemistry & Geophysics ; Oceanography
资助信息	The manuscript was reviewed by Pro. Clift, Pro. Xie, and Lei PhD, and their valuable suggestions help us both in English language and in depth to improve the quality of the paper. This research was supported by the National Key Basic Research and Development Program (973 Program) (No. 2009CB219401), the Major National Science and Technology Programs (No. 2011ZX05025-00201) and CAS key Lab of Marginal Sea Geology, South China Sea Institute of Oceanology (No. MSGL13-06).
原文出处	SPRINGER
语种	英语
WOS记录号	WOS:000328450000010
公开日期	2015-01-22
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/11098]
专题	南海海洋研究所_中科院边缘海地质重点实验室
推荐引用方式 GB/T 7714	[Zhao, Zhongxian,Sun, Zhen,Liu, Jianbao,et al. The dynamic mechanism of post-rift accelerated subsidence in Qiongdongnan Basin, northern South China Sea[J]. MARINE GEOPHYSICAL RESEARCH,2013,34(41702):295-308.
APA	[Zhao, Zhongxian,Sun, Zhen,Liu, Jianbao,Sun, Longtao] Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China,&[Sun, Zhipeng] Zhanjiang Branch CNOOC Ltd, Zhanjiang 524057, Peoples R China.(2013).The dynamic mechanism of post-rift accelerated subsidence in Qiongdongnan Basin, northern South China Sea.MARINE GEOPHYSICAL RESEARCH,34(41702),295-308.
MLA	[Zhao, Zhongxian,et al."The dynamic mechanism of post-rift accelerated subsidence in Qiongdongnan Basin, northern South China Sea".MARINE GEOPHYSICAL RESEARCH 34.41702(2013):295-308.