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Reconstruction of repeated Quaternary slope failures in the northern South China Sea
Sun, Qiliang1,2,3; Cartwright, Joe4; Xie, Xinong1,3; Lu, Xiangyang1,3; Yuan, Shengqiang5; Chen, Chuanxu6; Sun, Qiliang(CUG, Coll Marine Sci & Technol, Wuhan 430074, Hubei, Peoples R China)
2018-07-01
Source PublicationMARINE GEOLOGY
Volume401Pages:17-35
Contribution Rank第1完成单位 ; 第2完成单位 ; 第3完成单位 ; 第4完成单位 ; 第5完成单位 ; 第6完成单位
AbstractA series of Quaternary mass transport deposits (MTDs) with a total areal extent of similar to 11,000 km(2) and a conservative volume estimate of similar to 1035 km(3) are observed in the Pearl River Mouth Basin (PRMB), northern South China Sea (SCS), based on integrated analysis of extensive 2-D/3-D seismic data, multibeam bathymetric data and ODP/IODP wells. Unlike other large MTDs worldwide, the MTDs in this study are not directly sourced from slopes built on major deltaic depositional systems. Moreover, they are remarkable in that the whole PRMB is a giant debris flow corridor that has transected a broad subsided continental margin. The MTDs in this study have a large evacuation zone on the slope and a depositional zone in the ocean basin connected by a narrow pathway. Six events of MTDs (MTDa - MTDd on the slope and MTDo1- MTDo2 in the ocean basin) have been identified as being separated by basal erosional surfaces defined by strong negative seismic reflections. Similar ages and volumes (depleted volume of MTDb on the slope and the depositional volume of MTDo2) suggest that MTDo1 and MTDo2 correlate with MTDa and MTDb, respectively. The major factor controlling the occurrence of slope failures is argued to be the presence of a key reflection package. This package is interpreted to consist of gas charged, coarse-grained sediments deposited during a relative lowstand of sea level, overlain by a unit of finegrained sediments. Other contributing factors that influenced the morphology and position of the MTDs include the presence of free gas, normal faulting in the slope sediments, and seafloor relief related to igneous activity. From MTDd to MTDb, slope failures are shown to have retrogressed upslope with a decreasing time interval between events. The events, dimensions, susceptible factors and formation processes of slope failures in the study area are demonstrated for the first time in the petroliferous basin of northern SCS. Their recognition is important for geo-hazard assessment (e.g. tsunami) in this area. Moreover, this study highlights that the lithostratigraphy of the slope succession, especially the coarse-grained sediments in the deepwater area, can be an important component for the occurrence of slope failures, and may be a key factor in slope stability on other continental margins too.
SubtypeArticle
KeywordSlope Failures Mass Transport Deposits (Mtds) Debris Canyons Sediment Corridor Free Gas South China Sea
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.margeo.2018.04.009
URL查看原文
Indexed BySCI
Language英语
WOS KeywordPEARL RIVER MOUTH ; MASS-TRANSPORT DEPOSITS ; DEEP-WATER SAGS ; 3D SEISMIC DATA ; CONTINENTAL-MARGIN ; TRIGGERING MECHANISMS ; SUBMARINE LANDSLIDES ; TECTONIC EVOLUTION ; SEDIMENT FAILURES ; BASIN
WOS SubjectGeosciences, Multidisciplinary ; Oceanography
WOS IDWOS:000435056400003
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.idsse.ac.cn/handle/183446/5963
Collection深海科学研究部_深海地球物理与资源研究室
Corresponding AuthorSun, Qiliang; Sun, Qiliang(CUG, Coll Marine Sci & Technol, Wuhan 430074, Hubei, Peoples R China)
Affiliation1.CUG, Coll Marine Sci & Technol, Wuhan 430074, Hubei, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266061, Peoples R China
3.China Univ Geosci, Key Lab Tecton & Petr Resources, Minist Educ, Wuhan 430074, Hubei, Peoples R China
4.Univ Oxford, Dept Earth Sci, Oxford OX1 3AN, England
5.PetroChina, Res Inst Petr Exploraiton & Dev, Beijing 100083, Peoples R China
6.Chinese Acad Sci, Sanya Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China
Recommended Citation
GB/T 7714
Sun, Qiliang,Cartwright, Joe,Xie, Xinong,et al. Reconstruction of repeated Quaternary slope failures in the northern South China Sea[J]. MARINE GEOLOGY,2018,401:17-35.
APA Sun, Qiliang.,Cartwright, Joe.,Xie, Xinong.,Lu, Xiangyang.,Yuan, Shengqiang.,...&Sun, Qiliang.(2018).Reconstruction of repeated Quaternary slope failures in the northern South China Sea.MARINE GEOLOGY,401,17-35.
MLA Sun, Qiliang,et al."Reconstruction of repeated Quaternary slope failures in the northern South China Sea".MARINE GEOLOGY 401(2018):17-35.
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