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Depositional characteristics and processes of alongslope currents related to a seamount on the northwestern margin of the Northwest Sub-Basin, South China Sea
Chen, Hui1,2; Xie, Xinong1; Van Rooij, David2; Vandorpe, Thomas2; Su, Ming3,4; Wang, Dongxiao5
2014-09-01
Source PublicationMARINE GEOLOGY
Volume355Pages:36-53
AbstractThis 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.
SubtypeArticle
KeywordDeep-water Sedimentation Bottom Current Obstacle Contourite South China Sea
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.margeo.2014.05.008
WOS Subject ExtendedGeology ; Oceanography
WOS KeywordMEDITERRANEAN OUTFLOW WATER ; PEARL RIVER MOUTH ; QUASI-SYNOPTIC INTERPRETATION ; WESTERN BOUNDARY CURRENT ; NORTHERN ROCKALL TROUGH ; DEEP-WATER ; CONTOURITE DRIFTS ; INTERMEDIATE WATER ; CONTINENTAL-MARGIN ; CIRCULATION PROCESSES
Indexed BySCI
Language英语
WOS SubjectGeosciences, Multidisciplinary ; Oceanography
WOS IDWOS:000341339600004
Citation statistics
Cited Times:20[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.giec.ac.cn/handle/344007/10685
Collection中国科学院广州能源研究所
Affiliation1.China Univ Geosci, Fac Resources, Minist Educ, Key Lab Tecton & Petr Resources, Wuhan 430074, Hubei, Peoples R China
2.Univ Ghent, Dept Geol & Soil Sci, Renard Ctr Marine Geol, B-9000 Ghent, Belgium
3.Chinese Acad Sci, Guangzhou Inst Energy Convers, Key Lab Renewable Energy & Gas Hydrate, Guangzhou 510640, Guangdong, Peoples R China
4.Chinese Acad Sci, Guangzhou Ctr Gas Hydrate Res, Guangzhou 510640, Guangdong, Peoples R China
5.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Trop Marine Environm Dynam, Guangzhou 510640, Guangdong, Peoples R China
Recommended Citation
GB/T 7714
Chen, Hui,Xie, Xinong,Van Rooij, David,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, Hui,Xie, Xinong,Van Rooij, David,Vandorpe, Thomas,Su, Ming,&Wang, Dongxiao.(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, Hui,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.
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