Rifting process and formation mechanisms of syn-rift stage prolongation in the deepwater basin, northern South China Sea

doi:10.1007/s11434-008-0326-1

IOCAS-IR > 海洋环流与波动重点实验室

	Rifting process and formation mechanisms of syn-rift stage prolongation in the deepwater basin, northern South China Sea
	Dong DongDong 1,2; Wu ShiGuo 1,3; Zhang GongCheng 4; Yuan ShengQiang 1,2
	2008-12-01
发表期刊	CHINESE SCIENCE BULLETIN
ISSN	1001-6538
卷号	53 期号:23 页码:3715-3725
文章类型	Article
摘要	Based on the latest seismic and geological data, tectonic subsidence of three seismic lines in the deepwater area of Pearl River Mouth Basin (PRMB), the northern South China Sea (SCS), is calculated. The result shows that the rifting process of study area is different from the typical passive continental margin basin. Although the seafloor spreading of SCS initiated at 32 Ma, the tectonic subsidence rate does not decrease but increases instead, and then decreases at about 23 Ma, which indicates that the rifting continued after the onset of seafloor spreading until about 23 Ma. The formation thickness exhibits the same phenomenon, that is the syn-rift stage prolonged and the post-rift thermal subsidence delayed. The formation mechanisms are supposed to be three: (1) the lithospheric rigidity of the northern SCS is weak and its ductility is relatively strong, which delayed the strain relaxation resulting from the seafloor spreading; (2) the differential layered independent extension of the lithosphere may be one reason for the delay of post-rift stage; and (3) the southward transition of SCS spreading ridge during 24 to 21 Ma and the corresponding acceleration of seafloor spreading rate then triggered the initiation of large-scale thermal subsidence in the study area at about 23 Ma.; Based on the latest seismic and geological data, tectonic subsidence of three seismic lines in the deepwater area of Pearl River Mouth Basin (PRMB), the northern South China Sea (SCS), is calculated. The result shows that the rifting process of study area is different from the typical passive continental margin basin. Although the seafloor spreading of SCS initiated at 32 Ma, the tectonic subsidence rate does not decrease but increases instead, and then decreases at about 23 Ma, which indicates that the rifting continued after the onset of seafloor spreading until about 23 Ma. The formation thickness exhibits the same phenomenon, that is the syn-rift stage prolonged and the post-rift thermal subsidence delayed. The formation mechanisms are supposed to be three: (1) the lithospheric rigidity of the northern SCS is weak and its ductility is relatively strong, which delayed the strain relaxation resulting from the seafloor spreading; (2) the differential layered independent extension of the lithosphere may be one reason for the delay of post-rift stage; and (3) the southward transition of SCS spreading ridge during 24 to 21 Ma and the corresponding acceleration of seafloor spreading rate then triggered the initiation of large-scale thermal subsidence in the study area at about 23 Ma.
关键词	South China Sea Deepwater Basin Tectonic Subsidence Rifting Breakup Unconformity
学科领域	Multidisciplinary Sciences
DOI	10.1007/s11434-008-0326-1
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000261257600014
引用统计	被引频次：39[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/5206
专题	海洋环流与波动重点实验室
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China 3.China Univ Petr, Qingdao 266555, Peoples R China 4.CNOOC Res Ctr, Beijing 100027, Peoples R China
第一作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Dong DongDong,Wu ShiGuo,Zhang GongCheng,et al. Rifting process and formation mechanisms of syn-rift stage prolongation in the deepwater basin, northern South China Sea[J]. CHINESE SCIENCE BULLETIN,2008,53(23):3715-3725.
APA	Dong DongDong,Wu ShiGuo,Zhang GongCheng,&Yuan ShengQiang.(2008).Rifting process and formation mechanisms of syn-rift stage prolongation in the deepwater basin, northern South China Sea.CHINESE SCIENCE BULLETIN,53(23),3715-3725.
MLA	Dong DongDong,et al."Rifting process and formation mechanisms of syn-rift stage prolongation in the deepwater basin, northern South China Sea".CHINESE SCIENCE BULLETIN 53.23(2008):3715-3725.

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