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Morphology and evolution of submarine canyons around the Zhongsha Platform, South China Sea: Implications for sedimentary processes in a modern isolated carbonate setting

文献类型：期刊论文

作者Chen, Junjin2,3,4; Wu, Shiguo3; Li, Qi2,4; Wei, Chenglong1; Fu, Guowei1; Chen, Wanli3; Qin, Yongpeng3; Khan, Umair3; Wu, Songlin3
刊名MARINE GEOLOGY
出版日期2024-09-01
卷号475页码:18
关键词Submarine canyons Submarine landslides Gravity flows Sedimentary processes Isolated carbonate platform South China Sea
ISSN号0025-3227
DOI10.1016/j.margeo.2024.107362
英文摘要Recent high-resolution multibeam bathymetry and seismic data from the platform-top to the abyssal plain of the Zhongsha Platform allow for a detailed investigation of the morphologies, spatial distribution, and trigger mechanisms of submarine canyons, submarine landslides, and associated sedimentary features along modern isolated carbonate slopes. The newly observed Zhongsha Canyon System provides a natural laboratory for reconstructing the source-to-sink sedimentary processes in a pure carbonate setting. This study reveals that there are thirty-four submarine canyons at water depths between 300 and 4100 m on the northern and western slopes of the Zhongsha Platform. Two morphologically different submarine canyon types are identified: (1) dendritic canyons, which exhibit abundant tributaries with scallop-shaped failures at the canyon heads, and (2) linear canyons, which feature rare tributaries with elongated failures at the canyon heads. The dendritic canyons are more complex in morphology than the linear canyons as a result of the interaction among numerous tributaries. Canyon initiation and evolution pass through three phases: (1) initial stage: off-platform sediment transport and platform margin failures contribute to erosive gravity flows; (2) developmental stage: initiation and incision of submarine canyons along platform margin failures; and (3) mature stage: numerous mature canyons along the platform margin. Off-platform sediment transport, density cascading, gravity flows, monsoon currents, and deep circulation play an essential role in shaping the slope morphologies. In addition, submarine landslides are extensively observed along the entire slope of the Zhongsha Platform at water depths of 600 to 4200 m, including canyon-wall failures, slope landslides, canyon-front landslides, and slope-toe failures based on their location and genesis. These processes can steepen the platform slopes by upward retrogressive and downward progressive erosion. On a larger scale, the persistent submarine canyons and occurrence of landslides around the Zhongsha Platform contribute to the uniqueness of this landscape among modern carbonate slopes. The morphologies and evolutionary processes of Zhongsha Canyon System present significant differences from the global carbonate submarine canyons in terms of their dimensions and trigger mechanisms. The findings of this work provide novel insights into the morphological features and sedimentary processes of submarine canyons in modern isolated carbonate platform settings.
WOS关键词BARRIER-REEF MARGIN ; BAHAMA BANK ; SEQUENCE STRATIGRAPHY ; OFF-BANK ; SLOPE ; DEEP ; CIRCULATION ; TRANSPORT ; MALDIVES ; ARCHITECTURE
资助项目National Natural Science Foundation of China[U22A20581] ; China Geological Survey Program[DD20191027]
WOS研究方向Geology ; Oceanography
语种英语
WOS记录号WOS:001293425900001
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; China Geological Survey Program
源URL[http://ir.idsse.ac.cn/handle/183446/11459]  
专题深海科学研究部_深海地球物理与资源研究室
通讯作者Wu, Shiguo; Li, Qi
作者单位1.China Geol Survey, Haikou Marine Geol Survey Ctr, Haikou 571127, Peoples R China
2.China Univ Geosci, Key Lab Polar Geol & Marine Mineral Resources, Minist Educ, Beijing, Peoples R China
3.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China
4.China Univ Geosci, Sch Ocean Sci, Beijing 100083, Peoples R China
推荐引用方式
GB/T 7714		 Chen, Junjin,Wu, Shiguo,Li, Qi,et al. Morphology and evolution of submarine canyons around the Zhongsha Platform, South China Sea: Implications for sedimentary processes in a modern isolated carbonate setting[J]. MARINE GEOLOGY,2024,475:18.
APA Chen, Junjin.,Wu, Shiguo.,Li, Qi.,Wei, Chenglong.,Fu, Guowei.,...&Wu, Songlin.(2024).Morphology and evolution of submarine canyons around the Zhongsha Platform, South China Sea: Implications for sedimentary processes in a modern isolated carbonate setting.MARINE GEOLOGY,475,18.
MLA Chen, Junjin,et al."Morphology and evolution of submarine canyons around the Zhongsha Platform, South China Sea: Implications for sedimentary processes in a modern isolated carbonate setting".MARINE GEOLOGY 475(2024):18.

入库方式： OAI收割

来源：深海科学与工程研究所

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