气候变化领域集成服务门户(CCPortal): Multistage geomorphic evolution of the Central Canyon in the Qiongdongnan Basin, NW South China Sea

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DOI	10.1007/s11001-021-09448-8
	Multistage geomorphic evolution of the Central Canyon in the Qiongdongnan Basin, NW South China Sea
	Li, Chao; Chen, Guojun; Zhou, Qianshan; Li, Chengze; Sun, Rui; Lyu, Chengfu; Guo, Shuai
通讯作者	Zhou, QS (通讯作者)，Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China. ; Zhou, QS (通讯作者)，Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China.
发表日期	2021
ISSN	0025-3235
EISSN	1573-0581
卷号	42 期号:3
英文摘要	Seismic reflection data were used to investigate the multiple stages of headward erosion, incision, and sedimentation on the initiation and evolution of the Central Canyon, a Late Miocene-Pliocene continental slope-parallel canyon on the northwestern margin of the South China Sea. Secondary channels of the early stage generally display deep, V-shaped cross-sectional morphologies, indicating that vertical erosion was dominant in the early stage of canyon formation, while later-phase secondary channels have shallow, U-shaped cross sections, indicating that sedimentation dominated in the late stage. Influenced by gradual sea-level rise, headward erosion shifted the Central Canyon head from the Qiongdongnan Basin to the southeastern margin of the Yinggehai Basin. The length of headward erosion is up to 140 km, equivalent to one-fourth of the total length of the Central Canyon (525 km). The thalweg depth, height, and width of the Central Canyon increases down canyon from 2723 m, 164 m, and 2 km to 5318 m, 1023 m, and 16 km, respectively. This increase is gradual on gently-sloping palaeoseafloor, and more abrupt on steep-gradient palaeoseafloor. Canyon segments on gently-sloping palaeoseafloor are also characterised by a good correlation between canyon height and width. The sediments fill in the Central Canyon differ across the canyon's segments. Turbidites and debrites infill the upstream segment of the Central Canyon. Turbidites and Mass-transport deposits are widespread in the middle reaches of the Central Canyon. The typical feature of the Central Canyon's downstream segment is under-compensation, and canyon wall collapse are common in the upper fill of the downstream segment. We reconstruct the multistage evolution of the Central Canyon as comprising primary erosion, burial, renewed erosion, infilling, and abandonment stages. This multistage evolution was mainly controlled by relative sea-level fluctuations of the Qiongdongnan Basin.
关键词	SEISMIC GEOMORPHOLOGY SUBMARINE-CANYON DEEP-WATER NORTHERN MARGIN FILLING PROCESS UPPER MIOCENE SYSTEM ARCHITECTURE PROVENANCE SEDIMENTATION
英文关键词	Central Canyon; Deep-water canyons; Multistage evolution; Headward erosion; Qiongdongnan Basin
语种	英语
WOS研究方向	Geochemistry & Geophysics ; Oceanography
WOS类目	Geochemistry & Geophysics ; Oceanography
WOS记录号	WOS:000680557400001
来源期刊	MARINE GEOPHYSICAL RESEARCH
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/254059
作者单位	[Li, Chao; Chen, Guojun; Zhou, Qianshan; Li, Chengze; Lyu, Chengfu] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China; [Li, Chao; Chen, Guojun; Zhou, Qianshan; Lyu, Chengfu] Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China; [Li, Chengze] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Sun, Rui; Guo, Shuai] Res Inst China Natl Offshore Oil Corp, Beijing 100028, Peoples R China
推荐引用方式 GB/T 7714	Li, Chao,Chen, Guojun,Zhou, Qianshan,et al. Multistage geomorphic evolution of the Central Canyon in the Qiongdongnan Basin, NW South China Sea[J]. 中国科学院西北生态环境资源研究院,2021,42(3).
APA	Li, Chao.,Chen, Guojun.,Zhou, Qianshan.,Li, Chengze.,Sun, Rui.,...&Guo, Shuai.(2021).Multistage geomorphic evolution of the Central Canyon in the Qiongdongnan Basin, NW South China Sea.MARINE GEOPHYSICAL RESEARCH,42(3).
MLA	Li, Chao,et al."Multistage geomorphic evolution of the Central Canyon in the Qiongdongnan Basin, NW South China Sea".MARINE GEOPHYSICAL RESEARCH 42.3(2021).