SCSIO OpenIR  > 热带海洋环境国家重点实验室(LTO)
Deep-water sedimentary systems and their relationship with bottom currents at the intersection of Xisha Trough and Northwest Sub-Basin, South China Sea
Chen, Hui; Xie, Xinong; Zhang, Wenyan; Shu, Yeqiang; Wang, Dongxiao; Vandorpe, Thomas; Van Rooij, David; Chen, H (reprint author), China Univ Geosci, Fac Resources, Minist Educ, Key Lab Tecton & Petr Resources, Lumo Rd 388, Wuhan 430074, Hubei, Peoples R China.; Zhang, WY (reprint author), Univ Bremen, MARUM Ctr Marine Environm Sci, Leobener Str 1, D-28359 Bremen, Germany.
2016
Source PublicationMARINE GEOLOGY
Volume378Pages:101-113
AbstractBased upon 2D reflection seismic data and numerical modelling, this study confirms the presence of a complex deep-water sedimentary system on the present-day seafloor at the intersection of the Xisha Trough and the Northwest Sub-Basin (South China Sea) and investigates their relationship with bottom currents. The deep water sedimentary system consists of submarine canyons, slides and slumps, wave-like successions, mounded drifts and two groups of marginal depressions (those with erosional features and those appearing as morphological sediment sinks). Three-dimensional process-based modelling is applied to investigate sediment dynamics induced by a combined effect of tidal currents and a quasi-steady geostrophic current (South China Sea Deep Water Circulation). Simulation results show that the South China Sea Deep Water Circulation at the southeastern flank of the seamount plateau could reach velocities of 15 cm/s during flood tides, enabling erosion and transport processes. In contrast, the rest of the plateau area is favoured for deposition, since current velocities in this region are persistently lower than 10 cm/s. The current velocities at the feet of the obstacles (where the morphological depressions are located) are strengthened and are several cm/s higher than that in adjacent flat areas (e.g. where the mounded drifts are located). The flow is constricted and accelerated after being deflected by the obstacles, resulting in contrasting higher sedimentation rates within the mounded sediments and lower rates at the morphological, depressions. A comparison between the seismic stratigraphy and the simulated fluid dynamics enables a decoding of the pathway, identifying the current regime as well as unravelling the relationship between depositional processes and the deep-sea water circulation. This study provides new insights and exposes new challenges in understanding the dynamics of deep-sea sedimentation processes in South China Sea. (C) 2015 Elsevier B.V. All rights reserved.
Department[Chen, Hui; Xie, Xinong] China Univ Geosci, Fac Resources, Minist Educ, Key Lab Tecton & Petr Resources, Lumo Rd 388, Wuhan 430074, Hubei, Peoples R China; [Chen, Hui; Xie, Xinong] China Univ Geosci, Fac Resources, Dept Marine Sci & Engn, Wuhan 430074, Hubei, Peoples R China; [Zhang, Wenyan] Univ Bremen, MARUM Ctr Marine Environm Sci, Leobener Str 1, D-28359 Bremen, Germany; [Shu, Yeqiang; Wang, Dongxiao] Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Trop Marine Environm Dynam, Guangzhou 510301, Guangdong, Peoples R China; [Chen, Hui; Vandorpe, Thomas; Van Rooij, David] Univ Ghent, Dept Geol & Soil Sci, Renard Ctr Marine Geol, Krijgslaan 281 s8, B-9000 Ghent, Belgium ; LTO
KeywordDeep-water Sedimentation Bottom Current Topographic Obstacle Numerical Current Simulation Northern South China Sea
Subject AreaGeology ; Oceanography
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/15345
Collection热带海洋环境国家重点实验室(LTO)
Corresponding AuthorChen, H (reprint author), China Univ Geosci, Fac Resources, Minist Educ, Key Lab Tecton & Petr Resources, Lumo Rd 388, Wuhan 430074, Hubei, Peoples R China.; Zhang, WY (reprint author), Univ Bremen, MARUM Ctr Marine Environm Sci, Leobener Str 1, D-28359 Bremen, Germany.
Recommended Citation
GB/T 7714
Chen, Hui,Xie, Xinong,Zhang, Wenyan,et al. Deep-water sedimentary systems and their relationship with bottom currents at the intersection of Xisha Trough and Northwest Sub-Basin, South China Sea[J]. MARINE GEOLOGY,2016,378:101-113.
APA Chen, Hui.,Xie, Xinong.,Zhang, Wenyan.,Shu, Yeqiang.,Wang, Dongxiao.,...&Zhang, WY .(2016).Deep-water sedimentary systems and their relationship with bottom currents at the intersection of Xisha Trough and Northwest Sub-Basin, South China Sea.MARINE GEOLOGY,378,101-113.
MLA Chen, Hui,et al."Deep-water sedimentary systems and their relationship with bottom currents at the intersection of Xisha Trough and Northwest Sub-Basin, South China Sea".MARINE GEOLOGY 378(2016):101-113.
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