题名: Three-dimensional seismic characterization of a complex sediment drift in the South China Sea: Evidence for unsteady flow regime
作者: Sun, Qiliang1,2; Cartwright, Joe3; Luedmann, Thomas4; Wu, Shiguo5; Yao, Genshun6
刊名: SEDIMENTOLOGY
出版日期: 2017-04-01
卷号: 64, 期号:3, 页码:832-853
关键词: Bottom current ; contourite drift ; honeycomb structures ; palaeoceanography ; South China Sea ; unsteady flow system
英文摘要: This study describes a previously unobserved reflection seismic configuration comprising a honeycomb planform and a repeated erosion/infill cross-section,based on high-resolution three-dimensional/two-dimensional seismic data and bathymetric data. The honeycomb structures cover an area of more than 5000km(2) and are developed within the Late Miocene to recent deep-water sediments of the north-western South China Sea. Linear erosional troughs up to 10km long and 1km wide are widely developed in this area, are intimately related to the particular seismic configuration and interpreted to represent a new type of sediment drift that is caused by unsteady bottom current regimes operating since the Late Miocene. The unsteady bottom current regimes are suggested to be triggered by irregular seabed morphologies. Considerable sea-floor topography was generated as a direct result of tectonic movements in the area since the Late Miocene, and this topography then influenced the pathways of strong bottom currents. This study highlights that: (i) an unsteady bottom current regime can be laterally extensive and persist for millions of years; (ii) structurally controlled sea-floor relief plays an important role in controlling the depositional pattern; and (iii) the bottom currents were active since the Late Miocene, flowing from the south-east through the Xisha-Guangle Gateway and crossing the honeycomb structure zone. This study documents a new style of drift and will help to improve current knowledge of palaeoceanography and understanding of the South China Sea deep-water circulation which is at present still poorly understood.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Geology
关键词[WOS]: DEEP-WATER CIRCULATION ; WEST SHETLAND DRIFT ; CONTOURITE DRIFTS ; MEDITERRANEAN OUTFLOW ; CONTINENTAL-MARGIN ; QIONGDONGNAN BASIN ; SLOPE ; CHANNELS ; CURRENTS ; SYSTEM
收录类别: SCI
语种: 英语
WOS记录号: WOS:000395706500009
Citation statistics:
内容类型: 期刊论文
URI标识: [http://ir.idsse.ac.cn/handle/183446/1825]  
Appears in Collections:深海科学与工程研究所_深海科学研究部_深海地球物理与资源研究室_期刊论文


作者单位: 1.China Univ Geosci, Key Lab Tecton & Petr Resources, Minist Educ, Fac Resources, Wuhan 430074, Peoples R China
2.China Univ Geosci, Dept Marine Sci & Engn, Fac Resources, Wuhan 430074, Peoples R China
3.Univ Oxford, Dept Earth Sci, Oxford OX1 3AN, England
4.Univ Hamburg, Dept Geosci, Ctr Earth Syst Res & Sustainabil, Bundesstr 55, D-20146 Hamburg, Germany
5.Chinese Acad Sci, Sanya Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China
6.PetroChina Hangzhou Inst Geol, Hangzhou 310023, Zhejiang, Peoples R China
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