Depositional characteristics and processes of alongslope currents related to a seamount on the northwestern margin of the Northwest Sub-Basin, South China Sea

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 热带海洋环境国家重点实验室(LTO)

	Depositional characteristics and processes of alongslope currents related to a seamount on the northwestern margin of the Northwest Sub-Basin, South China Sea
	Chen, H ; Xie, XN ; Van Rooij, D ; Vandorpe, T ; Su, M ; Wang, DX
刊名	MARINE GEOLOGY
	2014
卷号	355 页码:36-53
关键词	deep-water sedimentation bottom current obstacle contourite South China Sea
ISSN号	0025-3227
通讯作者	hui.chen.cug@gmail.com
中文摘要	This study infers, from 2D seismic data, the presence of a seamount-related deep-water contourite depositional system, located on the northwestern margin of the Northwest Sub-Basin of the South China Sea. Alongslope aligned erosive features and contourite drifts developed in water depths between 1000 and 1500 m on the present seafloor. A moat formed north of the seamount as a result of bottom current intensification after being deflected by an obstacle morphology, indicating a major eastward flowing current. Due to the Coriolis deflection, an elongated-mounded drift developed to the north of the moat and a modest plastered drift to the south (onlapping the north side of the seamount). Bottom currents away from the seamount are less or minimally intensified, generating contourite channels and furrows over the drift to the north of the moat. Combined with the known oceanographic setting, the bottom currents could belong to the anticyclonic South China Sea Intermediate Water circulation. From the seismic data, the architecture of contourite deposits during progressive burial of the seamount is documented. The first appearance of contourite channels in seismic Unit 1 is inferred to be the onset of the contourite depositional system, which could be traced back to the early Late Miocene. The following aggradational pattern of this system, from the base of seismic Unit 2 onwards, indicates relatively enhanced and stable South China Sea Intermediate Water circulation occurring on the northwestern margin of the northern South China Sea. Subsequently, the behaviour and depositional processes of bottom currents upstream and downstream the seamount are discussed. The depositional model suggests that a complex contourite channel system will replace the former moat-drift system once the seamount is buried. Finally, our findings may provide new challenges for investigating the South China Sea Cenozoic palaeoceanography, which are helpful to understand the sedimentary dynamic processes related to the South China Sea deepwater circulation. (C) 2014 Elsevier B.V. All rights reserved.
学科主题	Geology ; Oceanography
收录类别	SCI
资助信息	National Natural Science Foundation of China [91028009, 41372112]; National Key Projects of Oil and Gas [2011ZX05025-002-02]; Programme of Introducing Talents of Discipline to Universities [B14031]; Open Fund of the Key Laboratory of Marine Geology and Environment, China Academy of Sciences [MGE2013KG02]; IGCP project [619]; INQUA project [1204]
原文出处	ELSEVIER SCIENCE BV
WOS记录号	WOS:000341339600004
公开日期	2014-12-11
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/10510]
专题	南海海洋研究所_热带海洋环境国家重点实验室(LTO)
推荐引用方式 GB/T 7714	Chen, H,Xie, XN,Van Rooij, D,et al. Depositional characteristics and processes of alongslope currents related to a seamount on the northwestern margin of the Northwest Sub-Basin, South China Sea[J]. MARINE GEOLOGY,2014,355:36-53.
APA	Chen, H,Xie, XN,Van Rooij, D,Vandorpe, T,Su, M,&Wang, DX.(2014).Depositional characteristics and processes of alongslope currents related to a seamount on the northwestern margin of the Northwest Sub-Basin, South China Sea.MARINE GEOLOGY,355,36-53.
MLA	Chen, H,et al."Depositional characteristics and processes of alongslope currents related to a seamount on the northwestern margin of the Northwest Sub-Basin, South China Sea".MARINE GEOLOGY 355(2014):36-53.