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学科主题: Geosciences, Multidisciplinary
题名: Relationship between Formation of Zhongyebei Basin and Spreading of Southwest Subbasin, South China Sea
作者: Gao, HF ; Zhou, D ; Qiu, Y
通讯作者: promap@163.com
关键词: Zhongyebei basin ; SW subbasin ; South China Sea ; rifting ; seafloor spreading
刊名: JOURNAL OF EARTH SCIENCE
发表日期: 2009
卷: 20, 期:1, 页:66-76
收录类别: sci
部门归属: [Gao Hongfang; Zhou Di] Chinese Acad Sci, Key Lab Marginal Sea Geol, S China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China; [Gao Hongfang; Qiu Yan] Guangzhou Marine Geol Survey, Guangzhou 510760, Guangdong, Peoples R China
项目归属: 海洋地质
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.
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WOS记录号: WOS:000264753800007
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4640
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Gao, HF; Zhou, D; Qiu, Y.Relationship between Formation of Zhongyebei Basin and Spreading of Southwest Subbasin, South China Sea,JOURNAL OF EARTH SCIENCE,2009,20(1):66-76
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