Relationship between Formation of Zhongyebei Basin and Spreading of Southwest Subbasin, South China Sea

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	Relationship between Formation of Zhongyebei Basin and Spreading of Southwest Subbasin, South China Sea
	Gao, HF ; Zhou, D ; Qiu, Y
刊名	JOURNAL OF EARTH SCIENCE
	2009
卷号	20 期号:1 页码:66-76
关键词	Zhongyebei basin SW subbasin South China Sea rifting seafloor spreading
ISSN号	1674-487X
通讯作者	promap@163.com
中文摘要	The Zhongyebei (sic) basin (ZYBB) is an NE-striking, narrow and small sedimentary basin superimposing the southern 1/2 segment of the proposed spreading axes of the SW subbasin of the South China Sea (SCS). More than 4 500 in strata were identified in the Zhongyebei basin, including the Paleogene lower structure layer and the Neogene upper structure layer. The SW subbasin of the South China Sea has been regarded as an oceanic basin opened by scafloor spreading, as evidenced by the flat and deep (> 4 000 in mostly) seafloor with linear magnetic anomalies, and by the shallow Moho depth of < 12 km as estimated from gravity modeling. The classic model of seafloor spreading predicts that sediments on the oceanic crust are younger and thinner towards the spreading axes. But in the southwestern segment of the SW subbasin, contradictions appear. Firstly, the thick sedimentation in the ZYBB is along the proposed spreading axes. Secondly, the sediments are thinner (500-1 500 in) and younger away from the proposed spreading axes. Thirdly, geological elements of the two sides of spreading axes develop asymmetrically in the southwestern SW subbasin. Two models, the early opening model and the limited modeling model, are suggested for resolving this paradox. The former suggests that the opening of the SW subbasin was in Late Eocene and earlier than the oldest sediment in the ZYBB. The latter proposes that the opening of the SW subbasin was limited to its northeastern portion, and did not extend to the southwest portion. The ZYBB is a rift basin survived from the spreading but subjected to severe syn-spreading magmatic disturbance. The SW subbasin and the ZYBB of the SCS provide a unique opportunity for studying the structural evolution and dynamic mechanism at the tip of a propagating seafloor spreading. Both models have unresolved questions, and further studies are needed.
学科主题	Geosciences, Multidisciplinary
收录类别	SCI
原文出处	CHINA UNIV GEOSCIENCES
WOS记录号	WOS:000264753800007
公开日期	2011-07-03
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/4640]
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	Gao, HF,Zhou, D,Qiu, Y. Relationship between Formation of Zhongyebei Basin and Spreading of Southwest Subbasin, South China Sea[J]. JOURNAL OF EARTH SCIENCE,2009,20(1):66-76.
APA	Gao, HF,Zhou, D,&Qiu, Y.(2009).Relationship between Formation of Zhongyebei Basin and Spreading of Southwest Subbasin, South China Sea.JOURNAL OF EARTH SCIENCE,20(1),66-76.
MLA	Gao, HF,et al."Relationship between Formation of Zhongyebei Basin and Spreading of Southwest Subbasin, South China Sea".JOURNAL OF EARTH SCIENCE 20.1(2009):66-76.