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Luminescence characteristics of quartz from Holocene delta deposits of the Yangtze River and their provenance implications

机译：长江全新世三角洲矿床石英的发光特征及其源性影响

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摘要

The optically stimulated luminescence (OSL) sensitivity and OSL signal components of quartz grains were used to investigate provenance changes of Holocene sediments from the Yangtze River delta. The variation of luminescence sensitivity was observed in multiple grain aliquots and single grains of quartz from different sedimentary units of the Yangtze River delta. Laboratory experiments suggest that repeated dosing/bleaching cycles increase the luminescence sensitivity of quartz from the studied sediments. High variable thermal activation curves were observed even for samples from the same sedimentary unit, implying highly diverse sources for the delta deposits of the Yangtze River. Different sedimentary units show quartz with similar OSL component contributions, and repeated dosing/bleaching cycles and heating treatment are unable to affect the relative contributions of the fast and medium components to the bulk OSL signal. The samples from unit 1 (U1, tidal river, 15-11 ka), unit 2 (U2, estuary, 11-9 ka) and unit 6 (U6, delta plain, ca. 1 ka to the present) show relatively higher luminescence sensitivity in comparison to unit 3 (U3, tidal sand ridge, 9-4 ka), unit 4 (U4, prodelta, 4-2.5 ka) and unit 5 (U5, delta front, 2.5-1 ka), implying changing sediment sources over time. Such a temporal variation of sediment source can be explained by the transgressive/regressive history of the Yangtze River delta as well as by Asian monsoon variability since the last deglaciation. It demonstrates that luminescence sensitivity of quartz has great potential for tracing sediment sources in the Yangtze River delta, but more work is needed to characterize specific sources to establish a source-to-sink linkage.
机译：石英晶粒的光学刺激的发光（OSL）敏感性和OSL信号分量用于研究长江三角洲全茂沉积物的出处变化。在长江三角洲的不同沉积单元中，在多谷物等分试样和石英的单粒等分试样和单粒中观察到发光敏感性的变化。实验室实验表明，重复的计量/漂白循环增加了石英从研究的沉积物的发光敏感性。甚至对于来自相同沉积单位的样品，观察到高可变热激活曲线，这意味着长江的DELTA沉积物的高度多样化的来源。不同的沉积单位显示具有相似OSL组件贡献的石英，重复的给药/漂白循环和加热处理不能影响快速和介质组分对散装OSL信号的相对贡献。单元1（U1，潮汐河，15-11ka），单元2（U2，Z，11-9 Ka）和单元6（U6，Delta Plane，Ca.1ka至目前）的样品显示出相对较高的发光与单元3（U3，潮汐砂脊，9-4ka），单元4（U4，ProDelta，4-2.5 kA）和单元5（U5，Delta Front，2.5-1 Ka）相比，敏感性暗示，暗示沉积物来源变化随着时间的推移。沉积物源的这种时间变化可以通过长江三角洲的违规/回归历史以及自上次解析以来的亚洲季风变异。它表明，石英的发光敏感性对长江三角洲的追踪沉积物来源具有很大的潜力，但需要更多的作品来表征特定来源以建立源区的联系。

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  • 来源
    《Quaternary geochronology》 |2019年第2019期|共7页
  • 作者

    Nian Xiaomei; Zhang Weiguo; Qiu Fengyue; Qin Jintang; Wang Zhanghua; Sun Qianli; Chen Jing; Chen Zhongyuan; Liu Niankai;

  • 作者单位

    East China Normal Univ State Key Lab Estuarine &

    Coastal Res Shanghai 200062 Peoples R China;

    East China Normal Univ State Key Lab Estuarine &

    Coastal Res Shanghai 200062 Peoples R China;

    East China Normal Univ State Key Lab Estuarine &

    Coastal Res Shanghai 200062 Peoples R China;

    China Earthquake Adm Inst Geol State Key Lab Earthquake Dynam Beijing 100029 Peoples R China;

    East China Normal Univ State Key Lab Estuarine &

    Coastal Res Shanghai 200062 Peoples R China;

    East China Normal Univ State Key Lab Estuarine &

    Coastal Res Shanghai 200062 Peoples R China;

    East China Normal Univ State Key Lab Estuarine &

    Coastal Res Shanghai 200062 Peoples R China;

    East China Normal Univ State Key Lab Estuarine &

    Coastal Res Shanghai 200062 Peoples R China;

    Tsinghua Univ Dept Hist Sci Beijing 100084 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地球物理学;
  • 关键词

    Optically stimulated luminescence (OSL); Quartz; Luminescence sensitivity; Provenance; Yangtze River delta;

    机译：光学刺激的发光（OSL）;石英;发光敏感性;来源;长江三角洲;

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