Characteristic of detrital zircon U-Pb geochronology in the southern Okinawa Trough and its implication for sediment provenance
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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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Key words:
- Okinawa Trough /
- detrital zircon /
- U-Pb geochronology /
- provenance tracing
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表 1 H4-S2碳同位素测定年龄
Table 1. Radiocarbon dating of H4-S2
深度/cm 属种 AMS14C测试年龄/a BP 校正年龄/a BP 数据来源 中间年龄 范围/2σ 125 浮游有孔虫混合种 560±30 159 260～47 参考文献 [40] 283 690±30 304 424～230 387 730±30 346 432～268 477 1 090±30 624 682～541 
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表 2 H4-S2样品粒度特征
Table 2. Grain-size parameters of H4-S2
样品号 深度/cm 沉积年代 分选系数 偏度 峰度 平均粒径/μm 黏土含量/% 粉砂含量/% 砂含量/% OTS-1 26～66 1954—1993年 1.34 1.01 5.17 17.36 11.9 88.0 0.2 OTS-2 112～152 1828—1879年 1.49 0.67 4.23 22.20 11.4 82.9 5.7
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表 4 H4-S2与潜在物源区碎屑锆石年龄主要分布区间占比
Table 4. Percentage of the major zircon U-Pb age groups of the H4-S2 and potential provenance area
样品号 主要年龄分布区间及比例 200～100 Ma 300～200 Ma 500～300 Ma 1100～600 Ma 2 200～1 700 Ma 2 800～2 400 Ma OTS-1 17.24% 14.94% 13.79% 28.74% 16.09% 9.20% OTS-2 5.80% 24.64% 11.59% 37.68% 11.59% 8.70% 兰阳河口 22.22% 15.56% 22.22% 15.56% 15.56% 8.89% 浊水溪口 20.69% 13.79% 9.20% 11.49% 25.29% 19.54% 长江口 11.22% 20.41% 5.05% 39.39% 20.20% 3.03% 瓯江口 86.57% 1.49% 0.00% 0.00% 12.31% 0.00% 闽江口 28.63% 20.78% 31.13% 13.23% 4.67% 1.17% 东海陆架 18.05% 21.55% 13.78% 29.32% 10.78% 6.52%
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表 5 H4-S2与潜在物源区碎屑锆石年龄分布相关性分析结果
Table 5. Correlation analysis results of age distribution for detrital zircon between H4-S2 and potential provenance areas
OTS-1 OTS-2 兰阳河口 浊水溪口 长江口 瓯江口 闽江口 东海陆架 OTS-1 1.00 OTS-2 0.78 1.00 兰阳河口 0.21 −0.17 1.00 浊水溪口 −0.30 −0.55 −0.27 1.00 长江口 0.91 0.88 −0.07 −0.18 1.00 瓯江口 0.04 −0.47 0.54 0.42 −0.18 1.00 闽江口 0.10 −0.08 0.90 −0.53 −0.15 0.42 1.00 东海陆架 0.87 0.83 0.28 −0.53 0.82 0.04 0.36 1.00
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