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Age and sedimentary characteristics of beach sediments from Yongle Atoll, South China Sea: Implications for sediments supply in a coral reef system

文献类型：期刊论文

作者Li, Yali1,2,5; Zou, Xinqing1,5; Ge, Chendong1; Tan, Ming4; Tang, Meng1; Liu, Xiaotong1; Wang, Lisheng4; Liu, Yang1; Wang, Xiaohui3
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2020
卷号187页码:11
关键词Beach sediments Coral reef Th-230 ages Grain-size characteristics Sediment supply
ISSN号1367-9120
DOI10.1016/j.jseaes.2019.104083
英文摘要Low-lying reef islands constructed from unconsolidated sediments are of growing interest due to concerns over the future stability of island landforms in response to climatic change and sea-level rise. Sediment characteristics, combined with the constituents and physical processes, are fundamental to understand the links between sediment production and their supply to an island's beach reservoir. The grain size, constituents, and Th-230 age of beach sediments from five islands at Yongle Atoll in the South China Sea were analyzed. Data reveal that coral grains are the dominant constituents of the beach sediments, followed by mollusks, coralline algae, foraminifera, Halimeda, and bryozoans. The mean grain sizes of the beach sediment were within a range of 226-4215 mu m, and the coarsest sands were located near the passages in the atoll rim. Transportation by tropical cyclone generated waves and winnowing by tides are potentially the main factors that influenced the grain-size characteristics. Calibrated Th-230 age dates for bulk sand samples date the beach sediment between 424 yr BP and 5953 yr BP. Dating of coral sand samples from the beach sediment provides ages of 686-5780 yr BP; the coral sands from a vertical section (1.2 m depth) located on the beach at Jinqing Island were dated at 1154-3824 yr BP. The age reversal on the vertical section, with similar ages of beach sediment on any single island and different age ranges on different islands in an atoll, indicates that the coral sediment supply processes occurred within a relatively close time period and that different islands had different sediment supply rates. The temporal link between the coral-dominated sediment production and the beach reservoir provides an important insight into understanding the sediments supply mechanism of atoll islands in the northwestern Pacific Ocean.
WOS关键词CARBONATE FORMATION ; RYUKYU ISLANDS ; XISHA ISLANDS ; INDIAN-OCEAN ; BARRIER ; FORAMINIFERA ; MAINTENANCE ; PLATFORMS ; STABILITY ; RECORDS
资助项目Collaborative Innovation Center of South China Sea Studies ; Sansha municipal government
WOS研究方向Geology
语种英语
WOS记录号WOS:000502893500015
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构Collaborative Innovation Center of South China Sea Studies ; Collaborative Innovation Center of South China Sea Studies ; Sansha municipal government ; Sansha municipal government ; Collaborative Innovation Center of South China Sea Studies ; Collaborative Innovation Center of South China Sea Studies ; Sansha municipal government ; Sansha municipal government ; Collaborative Innovation Center of South China Sea Studies ; Collaborative Innovation Center of South China Sea Studies ; Sansha municipal government ; Sansha municipal government ; Collaborative Innovation Center of South China Sea Studies ; Collaborative Innovation Center of South China Sea Studies ; Sansha municipal government ; Sansha municipal government
源URL[http://ir.iggcas.ac.cn/handle/132A11/95877]  
专题地质与地球物理研究所_中国科学院新生代地质与环境重点实验室
通讯作者Zou, Xinqing; Ge, Chendong
作者单位1.Nanjing Univ, Sch Geog & Ocean Sci, Key Lab Coastal & Isl Dev, Minist Educ, Nanjing 210023, Jiangsu, Peoples R China
2.Sun Yat Sen Univ, Sch Marine Sci, Zhuhai 519082, Peoples R China
3.Nat Resources & Planning Bur Chengmai Cty, Haikou 571900, Hainan, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
5.Nanjing Univ, Collaborat Innovat Ctr South China Sea Studies, Nanjing 210093, Jiangsu, Peoples R China
推荐引用方式
GB/T 7714		 Li, Yali,Zou, Xinqing,Ge, Chendong,et al. Age and sedimentary characteristics of beach sediments from Yongle Atoll, South China Sea: Implications for sediments supply in a coral reef system[J]. JOURNAL OF ASIAN EARTH SCIENCES,2020,187:11.
APA Li, Yali.,Zou, Xinqing.,Ge, Chendong.,Tan, Ming.,Tang, Meng.,...&Wang, Xiaohui.(2020).Age and sedimentary characteristics of beach sediments from Yongle Atoll, South China Sea: Implications for sediments supply in a coral reef system.JOURNAL OF ASIAN EARTH SCIENCES,187,11.
MLA Li, Yali,et al."Age and sedimentary characteristics of beach sediments from Yongle Atoll, South China Sea: Implications for sediments supply in a coral reef system".JOURNAL OF ASIAN EARTH SCIENCES 187(2020):11.

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来源：地质与地球物理研究所

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