近9ka以来泰国湾高分辨的生物硅记录及其古生产力意义  

High-resolution record of biogenic silica and its paleoproductivity implication in the Chanthaburi coast,Gulf of Thailand over the last 9000 aBP

作　　者：刘璇 陈敏 戚洪帅 Apitida Wasuwatcharapong Apichai Kanchanapant 王承涛 许亚 LIU Xuan;CHEN Min;QI Hongshuai;Apitida Wasuwatcharapong;Apichai Kanchanapant;WANG Chengtao;XU Ya(Third Institute of Oceanography,Ministry of Natural Resources,Xiamen 361005,China;College of Marine Sciences,Shanghai Ocean University,Shanghai 201306,China;Fujian Provincial Key Laboratory of Marine Physical and Geological Processes,Xiamen 361005,China;Department of Mineral Resources,Ministry of Natural Recourses and Environment,Bangkok 10400,Thailand)

机构地区：[1]自然资源部第三海洋研究所,厦门361005 [2]上海海洋大学海洋科学学院,上海201306 [3]福建省海洋物理与地质过程重点实验室,厦门361005 [4]泰国自然资源与环境部矿产资源局,曼谷泰国10400

出　　处：《海洋地质与第四纪地质》2024年第6期121-129,共9页Marine Geology & Quaternary Geology

基　　金：福建省自然科学基金计划资助项目(2023J011378);自然资源部第三海洋研究所基本科研业务费专项资金资助项目(海三科2019018,海三科2020017);国家重点研发计划资助(2019YFE0124700);中东盟海上合作基金“海洋珍稀动物保护合作研究”项目。

摘　　要：以2017年在泰国湾尖竹汶海岸获取的LSC05和WLE08沉积物柱样为研究对象,对其进行了高分辨率的生物硅和有机碳分析,结合AMS^(14)C测年结果,探讨了9 ka以来泰国湾古生产力的变化情况。结果表明,LSC05和WLE08柱样中的生物硅含量分别为0.41%~1.56%(平均值为0.88%)和0.60%~1.52%(平均值为1.11%),属于南海中的低值海域,主要受到区域内无上升流导致的低硅质骨骼和壳体供给量和陆源物质输入稀释的影响。将生物硅含量曲线与南亚夏季风替代指标曲线和南海区域温度异常值曲线进行对比发现,生物硅含量较高的时期所对应的海表初级生产力高值期可能是由于夏季风阶段性势力较强导致,有机碳含量曲线印证了对夏季风的响应。此外,生物硅含量曲线与格陵兰冰芯、董歌洞石笋以及阿曼Qunf岩洞石笋记录的对比结果显示,泰国湾古生产力的变化趋势与全球尺度的环境变化具有相关性,反映了泰国湾古环境变化对全球环境变化的响应。Based on the LSC05 and WLE08 core samples obtained from the Chanthaburi coast of the Gulf of Thailand in 2017,the biogenic silica,total organic carbon,and AMS^(14) C dating were analyzed.High-resolution data including grain size and biogenic silica content were obtained to explore the changes of paleoproductivity in the Gulf of Thailand since 9 ka.Results show that the contents of biogenic silica in the samples were 0.41%~1.56%(on average of 0.88%)for LSC05 and 0.60%~1.52%(on average of 1.11%)for WLE08,belonging to the lowvalue sea area of the South China Sea.This area was mainly affected by low supply of siliceous bones caused by the absence of upwelling in the study area,and the input dilution of regional inland-sourced materials.By comparing the biogenic silica content curve with the South Asian summer monsoon substitution index curve and the temperature anomaly curve in the South China Sea,we found that the high-value period of sea surface primary productivity corresponds to the period with high biogenic silica content,which might be due to the strong phased force of the summer monsoon.The organic carbon content curve confirmed the reconstruction results of paleoproductivity by biogenic silica.In addition,comparison between the biogenic silica content curve and the records of Greenland ice core,Dongge cave stalagmite,and Qunf cave in Oman stalagmite showed that the trend of paleoproductivity in the Gulf of Thailand was significantly correlated with the global environmental changes,reflecting the response of paleoenvironmental changes in the Gulf of Thailand to global environmental changes.

关 键 词：生物硅 古生产力 古气候 全球气候变化 泰国湾 

分 类 号：P736[天文地球—海洋地质]