朱博文,曾志刚. 冲绳海槽南部沉积物碎屑锆石U-Pb年代学特征及物源示踪意义[J]. 海洋地质前沿,2022,38(1):14-23. DOI: 10.16028/j.1009-2722.2020.190
    引用本文: 朱博文,曾志刚. 冲绳海槽南部沉积物碎屑锆石U-Pb年代学特征及物源示踪意义[J]. 海洋地质前沿,2022,38(1):14-23. DOI: 10.16028/j.1009-2722.2020.190
    ZHU Bowen, ZENG Zhigang. Characteristic of detrital zircon U-Pb geochronology in the southern Okinawa Trough and its implication for sediment provenance[J]. Marine Geology Frontiers, 2022, 38(1): 14-23. DOI: 10.16028/j.1009-2722.2020.190
    Citation: ZHU Bowen, ZENG Zhigang. Characteristic of detrital zircon U-Pb geochronology in the southern Okinawa Trough and its implication for sediment provenance[J]. Marine Geology Frontiers, 2022, 38(1): 14-23. DOI: 10.16028/j.1009-2722.2020.190

    冲绳海槽南部沉积物碎屑锆石U-Pb年代学特征及物源示踪意义

    Characteristic of detrital zircon U-Pb geochronology in the southern Okinawa Trough and its implication for sediment provenance

    • 摘要: 冲绳海槽南部作为冲绳海槽全新世以来沉积速率最快的区域,其沉积物记录了物源区、黑潮及东亚季风演化等多方面的信息。通过碎屑锆石年代学,对冲绳海槽南部H4-S2孔沉积物开展了物源示踪研究。结合核密度估计图解(Kernel Density Estimation,KDE)、累积年龄分布(Cumulative Age Distribution,CAD)及其相关性分析,进行了研究层位和潜在物源区的可视化分析与相似性检验,揭示了研究样品中2个层位碎屑锆石的年代学特征及物质来源。物源分析结果显示,近200 a来冲绳海槽南部沉积物中的碎屑锆石记录了东海陆架、长江以及兰阳河来源的物质,指示了除兰阳河外,东海陆架及长江在晚全新世对冲绳海槽南部的沉积物质来源具有重要贡献。

       

      Abstract: The southern Okinawa Trough is the area with the fastest deposition rate since the Holocene, and its sediments record the evolution of provenance, Kuroshio and the East Asian monsoon. In this paper, detrital zircon U-Pb geochronology is used to study the provenance of H4-S2 sediments in the southern Okinawa Trough. By means of Kernel Density Estimation (KDE), Cumulative Age Distribution (CAD) and correlation analysis, the visual analysis and similarity test for potential provenances of two layers of sediments are carried out for the trough, and thus the chronology and provenance of detrital zircon revealed. The provenance analysis suggests that the detrital zircon in the sediments from the southern Okinawa Trough are sourced from the East China Sea shelf, Yangtze River and Lanyang River during the last 200 years, which means that the East China Sea shelf and Yangtze River dominated the provenance of the Late Quaternary sediments in the southern Okinawa Trough.

       

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