晚更新世以来南黄海陆架沉积物源分析  

Analysis of sediment source of the South Huanghai Sea Shelf since the Late Pleistocene

作　　者：姚润森 蒋科迪 殷勇[1] 王平[2] YAO Runsen;JIANG Kedi;YIN Yong;WANG Ping(l.Key laboratory of Coastal and Island Development,Ministry of Education,School of Geography and Oceanic Sciences,Nanjing University,Nanjing 210023,China;School of Geographical Sciences,Nanjing Normal University,Nanjing 210023,China)

机构地区：[1]南京大学地理与海洋科学学院,海岸与海岛开发教育部重点实验室,江苏南京210023 [2]南京师范大学地理科学学院,江苏南京210023

出　　处：《海洋通报》2022年第2期189-199,共11页Marine Science Bulletin

基　　金：国家自然科学基金(40776032);国家重大科学研究计划(2013CB956501);江苏省重点基金(BK201300560)。

摘　　要：南黄海陆架地区物源研究备受关注,到底是长江还是黄河源至今尚未有定论。通过对长江和黄河流域锆石U-Pb测年数据集混合模拟分析以及结合YZ08孔沉积相和锆石U-Pb的年龄图谱分析,结果表明:晚更新世以来,南黄海陆架地区存在长江古河道,MIS5时期长江可能在苏北弶港入海;在物源方面,MIS5时期弶港地区主要受长江物源影响,MIS1~MIS2时期则为长江主导的混合源,随着黄河夺淮入海带来泥沙物质,近代以来转为黄河主导的混合源。基于Bootstrap随机抽样方法抓取了长江和黄河的锆石U-Pb测年数据集,并结合统计学原理模拟出长江和黄河不同比例混合物源的锆石年龄图谱,对锆石物源判别方法做出了改进,弥补了传统锆石U-Pb年龄图谱在混合源判别分析上的不足,对南黄海物源研究具有一定的意义。The provenance research of the South Huanghai Sea Shelf has attracted much attention. Its source is still unclear,whether from the Changjiang River or the Huanghe River. According to the simulating combination analysis of zircon U-Pb dating data sets of the Changjiang River and the Huanghe River basin, analysis of zircon U-Pb age figures and analysis of sedimentary faces of sediment core YZ08, the Changjiang River had existed in the South Huanghai Sea Shelf since the Late Pleistocene, and the ancient river channels of the Changjiang River may had flowed into the South Huanghai Sea during MIS5. As for provenance, the provenance of the Jianggang was mainly affected by the source of the Changjiang River during MIS5. During the MIS1 ~2 period, it was under the joint influence of the Changjiang River and the Huanghe River, and dominated by the Changjiang River. When the Huanghe River captured the Huaihe River into the South Huanghai Sea, the percentage of source of Huanghe River had increased and surpassed the Changjiang River. We capture the zircon U-Pb dating data sets of the Changjiang River and Huanghe River based on the random sampling method of Bootstrap, and simulate the zircon U-Pb age figure of different proportion mixture sources in combination with statistical principles, which improves the zircon source discrimination method, and makes up for the deficiency of the traditional zircon U-Pb age figure in the mixed source discrimination analysis. This study is of significance to the source study of the South Huanghai Sea Shelf.

关 键 词：物源分析 锆石U-PB定年 混合模型 南黄海陆架 黄河 长江 

分 类 号：P736.22[天文地球—海洋地质]