热带海洋学报

• •    

8000年以来东沙西南海域深水珊瑚发育演化特征及其控制因素

张斌1, 2, 3, 陈忠1, 2*, 许安涛1, 王雪松4, 田雨杭1,2, 张应威1,2,3   

  1. 1.中国科学院南海海洋研究所, 边缘海与大洋地质重点实验室, 广东 广州 510301

    2. 南方海洋科学与工程广东省实验室(广州), 广东,广州, 511458

    3. 中国科学院大学, 北京 100049

    4. 中国地质大学, 武汉 430074

  • 收稿日期:2022-02-24 修回日期:2022-04-11 出版日期:2022-04-14 发布日期:2022-04-14
  • 通讯作者: 陈忠
  • 基金资助:

    三亚崖州湾科技管理局2022年度科技计划项目(SKJC-2020-01-012); 国家自然科学基金项目(41976065, 41776061); 南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项(GML2019ZD0104)

Evolution characteristics and controlling factors of deep-water corals in the Southwest sea area of Dongsha since 8000 a BP

ZHANG Bin1, 2, 3, CHEN Zhong1, 2*, XU Antao1, WANG Xuesong4, TIAN Yuhang1, 2, ZHANG Yingwei1, 2, 3   

  1. 1. Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;

    2. Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 510301, China;

    3. University of Chinese Academy of Sciences, Beijing 100049, China;

    4. China University of Geosciences, Wuhan, 100049, China;



  • Received:2022-02-24 Revised:2022-04-11 Online:2022-04-14 Published:2022-04-14
  • Contact: zhong chen
  • Supported by:

     The 2020 Research Program of Sanya Yazhou Bay Science and Technology City (SKJC-2020-01-012);National Natural Science Foundation of China (41976065; 41776061); Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering GuangdongLaboratory (Guangzhou) (GML2019ZD0104).

摘要: 深水珊瑚骨骼记录了珊瑚生长环境精细变化,但目前对南海深水珊瑚生长的影响因素、演化阶段及其对海洋环境变化响应缺乏了解。本文对东沙西南海域深水珊瑚骨骼的化学元素、U-Th年龄进行测定和研究,揭示了8000 a BP以来东沙西南海域深水珊瑚发育演化特征及其控制因素。深水珊瑚常微量元素组合及因子分析表明:底流活动、初级生产力、陆源物质影响东沙西南海域深水珊瑚生长和演化。根据U-Th年龄将深水珊瑚演化划分为四个阶段,Ⅰ:8000 a-4500 a BP;Ⅱ:4500 a-2500 a BP;Ⅲ:2500 a-1200 a BP;Ⅳ:1200 a BP至今。海底流速、有机颗粒物、海水温度与热含量、生源元素供给的剧烈动荡变化导致了4500 a-2500 a BP珊瑚发育间断,较强底流活动、较强冬季风和有机颗粒物供给的消长变化影响东沙西南海域深水珊瑚演化阶段及其特征。研究结果为深入探究大洋边缘深水珊瑚影响因素、发育演化特征及其对海洋过程的响应提供了新视角。

关键词: 深水珊瑚, U-Th年龄, 演化阶段, 全新世, 东沙西南海域

Abstract: Deep-water coral (DWC) skeletons record the fine changes in the environment in which corals grow. However, the factors influencing the growth of DWCs in the South China Sea, evolutionary stages, and their responses to marine environmental changes are not well understood at present. In this paper, the chemical elements and U-Th ages of DWC skeletons in the Southwest sea area of Dongsha were determined and studied to reveal the development and evolution characteristics of DWCs since 8000 a BP and the factors controlling their growth. Major and trace elements and factor analysis of DWCs show that the growth and evolution of DWCs in the Southwest sea area of Dongsha are influenced by bottom current activity, primary productivity, and terrigenous materials. The evolution of DWCs can be divided into four stages according to U-Th age, Ⅰ: 8000 a-4500 a BP; Ⅱ: 4500 a-2500 a BP; Ⅲ: 2500 a-1200 a BP; Ⅳ: 1200 a BP till now. The drastic fluctuation of bottom current velocity, organic particulate matter, seawater temperature and heat content, and the supply of biogenic materials resulted in the development discontinuity of DWCs at 4500 a-2500 a BP. The strong bottom current activity, strong winter monsoon, and the supply of organic particulate matter affected the evolution stage and characteristics of DWCs in the Southwest sea area of Dongsha. The results provide a new perspective for further exploring the influencing factors, development, and evolution characteristics of DWCs at ocean margins and their responses to ocean processes.

Key words: deep-water coral, U-Th age, bottom current acticity, Holocene, Dongsha sea area