王玥铭^1,,
窦衍光^2,3,,,
徐景平^3,4,
陈晓辉^2,5,
李军^2,5,
蔡峰^2,5,
邹亮^2,5,
王利波^2,5
1. 中国海洋大学海洋地球科学学院, 山东 青岛 266100
2. 青岛海洋地质研究所, 山东 青岛 266071
3. 青岛海洋科学与技术国家实验室, 海洋地质过程与环境功能实验室, 山东 青岛 266061
4. 南方科技大学海洋科学与工程系, 广东 深圳 518055
5. 青岛海洋科学与技术国家 实验室, 海洋矿产资源评价与探测技术功能实验室, 山东 青岛 266061

基金项目: 国家重点基础研究发展规划项目（973项目）（批准号：2013CB429704）和国家自然科学基金面上项目（批准号：41776077）共同资助


详细信息

作者简介: 王玥铭, 女, 25岁, 硕士研究生, 海洋沉积学研究, E-mail:wangyueming103@163.com

通讯作者: 窦衍光, E-mail:douyanguang@gmail.com

中图分类号: P722.6, P736.21⁺3

收稿日期:2018-01-08
修回日期:2018-03-18
刊出日期:2018-05-30

Organic matter source in the middle Southern Okinawa Trough and its indication to upwelling evolution since 16 ka

Wang Yueming^1,,
Dou Yanguang^2,3,,,
Xu Jingping^3,4,
Chen Xiaohui^2,5,
Li Jun^2,5,
Cai Feng^2,5,
Zou Liang^2,5,
Wang Libo^2,5
1. College of Marine Geoscience, Ocean University of China, Qingdao 266100, Shandong
2. Qingdao Institute of Marine Geology, Qingdao 266071, Shandong
3. Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, Shandong
4. Department of Ocean Science & Engineering, Southern University of Science and Technology, Shenzhen 518055, Guangdong
5. Laboratory for Marine Mineral Resource, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, Shandong


More Information

Corresponding author: Dou Yanguang,E-mail:douyanguang@gmail.com

MSC: P722.6, P736.21⁺3

--> Received Date: 08 January 2018
Revised Date: 18 March 2018
Publish Date: 30 May 2018


摘要
摘要:基于¹⁴C测年，通过对OKT12孔有机碳、氮含量及碳同位素、粒度等指标的分析，探讨了16 ka以来冲绳海槽中南部有机质来源及其对上升流演变的指示。研究发现，TOC堆积速率、δ¹³C和TOC/TN比值等指标呈明显的三阶段变化。陆源C₃植物、海源浮游生物以及台湾河流悬浮体是OKT12孔有机质的3个主要端元。δ¹³C和TOC/TN比值物源判别显示，低海平面时期（16~10 ka），OKT12孔有机质主要来自陆源输入和海源浮游生物的贡献；10~7 ka阶段主要来自台湾河流悬浮体贡献，反映了早全新世以来黑潮的加强；高海平面以来（7~0 ka），OKT12孔有机质以海源浮游生物贡献为主，其变化反映了上升流的强弱波动。7~4 ka海洋浮游生物贡献量的增加指示上升流增强，4 ka以来贡献量减少指示上升流减弱。上升流变化与黑潮强弱、流轴位置变动有关，两者受到高频气候事件ENSO活动控制。
关键词: 有机质来源/
上升流演变/
黑潮/
ENSO/
冲绳海槽

Abstract:The core OKT12, mainly consist of clayed silt, was collected in the middle south Okinawa Trough(26.05°N, 125.34°E; water depth 1924.53 m). AMS ¹⁴C age results revealed that core OKT12(length 4.68 m) recorded the environment change since 16.3 ka, with volcanic ash seen at 6.8~7.3 ka. Kuroshio Current, the most important current in the research area, controlled ocean environment and transport of Taiwan material. TOC, TN content and organic carbon isotope analysis were conducted to discuss source of organic matter in the middle south Okinawa Trough since 16 ka and its response to development of upwelling in the Late Holocene. Change of organic matter source inferred by TOC accumulation rates, δ¹³C and TOC/TN ratio was divided into three sections. Terrigenous C₃ plant, marine plankton, and Taiwan river suspended sediment were the most important end-members of organic matter. Discrimination plots indicate organic matter of the core OKT12 was mainly from high terrestrial input and marine plankton when sea level was low(16~10 ka). During 10~7 ka, Taiwan river suspended sediment was main contributor, indicating strengthening of the Kuroshio Current. When sea level rose to high stand(7~0 ka), marine plankton controlled organic matter composition which indicated strengthening of upwelling intensity. Increasing marine plankton contribution indicated enhancement of upwelling during 7~4 ka. Since 4 ka, marine plankton contribution decreased when upwelling was weak. The strength of upwelling was related to intensity and position of the Kuroshio Current, which both might be affected by the high-frequency ENSO event.
Key words:organic matter source/
upwelling evolution/
Kuroshio Current/
ENSO/
Okinawa Trough



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