The occurrence, acoustic characteristics, and significance of submerged reefs on the continental shelf edge and upper slope, northern South China Sea

doi:10.1016/j.csr.2015.03.006

CORC > 自然资源部第一海洋研究所 > 自然资源部第一海洋研究所 > 业务部门 > 海洋地质与地球物理研究室

	The occurrence, acoustic characteristics, and significance of submerged reefs on the continental shelf edge and upper slope, northern South China Sea
	Li, Xishuang 1; Li, Xinzhong 2; Zhao, Qiang 1; Liu, Lejun 1; Zhou, Songwang 3
刊名	CONTINENTAL SHELF RESEARCH
	2015-06
卷号	100 页码:11-24
关键词	Northern South China Sea Acoustic detection Submerged reef Paleoenvironment Sea-level changes
ISSN号	0278-4343
DOI	10.1016/j.csr.2015.03.006
英文摘要	Comprehensive research was performed to investigate the existence of submerged reefs on the continental shelf edge and upper slope outside the Pearl River estuary in the northern South China Sea to analyze the morphology and distribution of the coral reefs, identify their ages, and discuss their paleoenvironmental significance. The results show that the submerged reefs are distributed on the topographic high of the continental shelf and upper slope at a water depth of 140-420 m, with an outcropping area of over 700 km(2). The submerged reefs are mainly topographically characterized by low mound protrusions, several to 20 m above the modern seafloor, and they exhibit three typical acoustic facies in the acoustic profile: punctate reflection, planar reflection, and mound reflection. Based on various geophysical data, we propose at least four stages (I-IV) of submerged reefs on the continental shelf edge and upper slope: The oldest stage I submerged reefs are covered by loose sedimentary strata of > 100 m thickness, a minority of stage II submerged reefs outcrop on the modern seafloor, and most stage III and IV submerged reefs outcrop on the seafloor. The submerged reefs developed on the top of the sandy or muddy substrate on the continental shelf edge and upper slope and formed during a period of low sea level. Sea-level changes controlled periodic reef formation events, with stage I, II, and IV reef formation events corresponding to three low-sea-level events, i.e., at 1450,600, and 20 ky B.P. Based on the maximum water depth (similar to 220 m) where the last glacial submerged reefs appeared, we estimate that the sea level during the last glacial maximum fell by similar to 132-152 m. Further geophysical surveys and sampling need to be performed to clarify the actual distribution, type, and age of the submerged reefs in the study area. (C) 2015 Elsevier Ltd. All rights reserved.
资助项目	Natural Science Foundation of China (NSFC)[41106064]
WOS研究方向	Oceanography
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000355348200002
内容类型	期刊论文
源URL	[http://ir.fio.com.cn/handle/2SI8HI0U/3655]
专题	业务部门_海洋地质与地球物理研究室
作者单位	1.State Ocean Adm, Inst Oceanog 1, Qingdao, Peoples R China; 2.China Natl Offshore Oil Corp, Res Ctr, Beijing, Peoples R China; 3.China Oilfield Serv Ltd, Survey Ctr, Tianjin, Peoples R China
推荐引用方式 GB/T 7714	Li, Xishuang,Li, Xinzhong,Zhao, Qiang,et al. The occurrence, acoustic characteristics, and significance of submerged reefs on the continental shelf edge and upper slope, northern South China Sea[J]. CONTINENTAL SHELF RESEARCH,2015,100:11-24.
APA	Li, Xishuang,Li, Xinzhong,Zhao, Qiang,Liu, Lejun,&Zhou, Songwang.(2015).The occurrence, acoustic characteristics, and significance of submerged reefs on the continental shelf edge and upper slope, northern South China Sea.CONTINENTAL SHELF RESEARCH,100,11-24.
MLA	Li, Xishuang,et al."The occurrence, acoustic characteristics, and significance of submerged reefs on the continental shelf edge and upper slope, northern South China Sea".CONTINENTAL SHELF RESEARCH 100(2015):11-24.