题名: Response of geomorphic and geological processes to insufficient and ample sediment supply along the upper continental slope in the north-western South China Sea
作者: Chen, Hongjun1,2,3; Zhan, Wenhuan1,3; Wu, Shiguo4
刊名: JOURNAL OF EARTH SYSTEM SCIENCE
出版日期: 2016-12-01
卷号: 125, 期号:8, 页码:1635-1655
关键词: Geomorphology ; geological processes ; continental slope ; sediment supply ; South China Sea
英文摘要: We document upper slope sedimentary process and strata on the passive margin of the north-western South China Sea (SCS) using multibeam bathymetry and high-resolution seismic data. The upper slope can be divided into two segments based on geomorphology, strata, and sediment supply. (1) The east segment is characterised by deep incised canyons and gullies, and slope failure. Submarine canyons with both U- and V-shaped morphology (13-28 km long x 2-4 km wide) are oriented NNE-SSW or NNW-SSE and are approximately perpendicular to the slope. Erosion is dominant, with escarpments, slumps, and several mass transport deposits (MTDs). Shelf-margin clinoforms show strongly upward vertical aggradation with time and are strongly aggradational in style. Since 5.5 Ma, the shelf break line migrated southwards and then retreated to its present position. The segment is classified as erosion-dominated due to insufficient sediment supply. (2) The west segment has a smooth surface, gentle gradient, and a strongly progradational style, with MTDs triggered by high sedimentation rates. Shelf-margin clinoforms display a combination of progradational and aggradational stacking patterns. The shelf break line migrated southwards with time. The segment is classified as deposition-dominated, resulting from plentiful sediment supply. Depositional models have been constructed for each segment: a constant shelf break model with insufficient sediment supply in the east, and a migration shelf break model with plenty sediment supply in the west. This case study contributes to the understanding of the upper slope sedimentary process and stratigraphic style under different sediment supply conditions.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Geosciences, Multidisciplinary ; Multidisciplinary Sciences
关键词[WOS]: MASS-TRANSPORT COMPLEXES ; RIVER SHEAR ZONE ; QIONGDONGNAN BASIN ; RED-RIVER ; CENTRAL CANYON ; YINGGEHAI BASIN ; SHELF-MARGIN ; SYSTEM ; SUBSIDENCE ; EVOLUTION
收录类别: SCI
语种: 英语
WOS记录号: WOS:000390038600010
Citation statistics:
内容类型: 期刊论文
URI标识: [http://ir.idsse.ac.cn/handle/183446/1673]  
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.Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China
2.Guangzhou Marine Geol Survey, Minist Land & Resources, Key Lab Marine Mineral Resources, Guangzhou 510075, Guangdong, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China
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