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首页> 外文期刊>Quaternary geochronology >Luminescence dating of a fluvial sequence using different grain size fractions and implications on Holocene flooding activities in Weihe Basin, central
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Luminescence dating of a fluvial sequence using different grain size fractions and implications on Holocene flooding activities in Weihe Basin, central

机译：利用不同粒度分数的氟序列的发光约会及渭河盆地全新世洪水活动的影响

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摘要

Palaeoflood reconstruction is of great importance to extend the flooding records and improve the understanding of their relationships with climatic change and geomorphologic evolution. As a large active rift basin in central China, Weihe Basin subsided and infilled in response to the uplift of the Tibetan Plateau and Asian monsoon variations. Many rivers drain out the erodible Chinese Loess Plateau with tremendous detritus and then build up considerable fluvial sequences. Scarcity of organic material and potential poor bleaching make the fluvial deposits difficult to date with radiocarbon and optically stimulated luminescence (OSL) technique, and as a result hinder the palaeoflood reconstruction. This study attempts to compare OSL ages resulted from different grain size fractions of quartz, and then cross-checks with independent radiocarbon ages, aiming to choose proper method to reconstruct the chronology of a fluvial sequence from the valley bank of Shichuan River, a tributary of Weihe River. The results show that the coarse quartz grains experienced better bleaching than fine quartz grains, and the comparison with AMS C-14 ages further confirms the efficient bleaching of the coarse quartz grains before burial. The sufficient bleaching of the coarse fraction could be attributed to sediment source from the upstream mountainous areas and long-distance transportation. Finally, five palaeoflood events were identified at the times of approximately 2.3-2.6 ka, 3.7-3.9 ka, 4.1-4.7 ka, 6.2-6.8 ka, and 8.9-9.2 ka, corresponding to the periods with intensified rainstorm and vegetation degradation associated with climatic deterioration. This study provides a regional evidence to improve our understanding of the response of river system evolution to climate change.
机译：Palaeoflood重建是非常重视扩大洪水记录，并改善与气候变化和地貌演变的关系。作为中国中部的一个大型活跃的裂缝盆地，渭河盆地消退并填补了藏高原和亚洲季风变异的隆起。许多河流用巨大的碎屑排水，然后积聚相当大的河流序列。有机材料的稀缺性和潜在的薄漂白使得史外迄今难以迄今为止迄今为止难以迄今为止难以讨论的毛粉和光学刺激的发光（OSL）技术，因此阻碍了Palaeoflood重建。该研究试图比较从石英的不同粒度分数导致的OSL年龄，然后用独立的射线碳的交叉检查，旨在选择适当的方法来重建来自四川省河流河岸的河流河流的年代序列的正常方法渭河。结果表明，粗石英粒经历了比细石英粒更好的漂白，与AMS C-14年龄的比较进一步证实了埋葬前粗石英谷物的有效漂白。粗级分的充分漂白可归因于来自上游山区和长途运输的沉积物来源。最后，在大约2.3-2.6 ka，3.7-3.9ka，4.1-4.7 kA，6.2-6.8 kA和8.9-9.2 ka的时间内鉴定了五个古古文食事件，对应于与患有相关的暴雨和植被降解的期间气候恶化。本研究提供了区域证据，以改善我们对河流系统演变对气候变化的反应的理解。

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  • 来源
    《Quaternary geochronology》 |2019年第2019期|共8页
  • 作者

    He Zhong; Long Hao; Yang Linhai; Zhou Jie;

  • 作者单位

    Chinese Acad Sci Inst Soil &

    Water Conservat Minist Water Resources Yangling 712100 Shaanxi Peoples R China;

    Chinese Acad Sci NIGLAS Nanjing Inst Geog &

    Limnol State Key Lab Lake Sci &

    Environm Nanjing 210008 Jiangsu Peoples R China;

    Chinese Acad Sci Northwest Inst Ecoenvironm &

    Resources Key Lab Desert &

    Desertificat Lanzhou 730000 Gansu Peoples R China;

    Chinese Acad Sci Inst Soil &

    Water Conservat Minist Water Resources Yangling 712100 Shaanxi Peoples R China;

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

    OSL dating; Fluvial sequence; Flooding activities; Weihe Basin; Chinese Loess Plateau;

    机译：OSL约会;氟序列;洪水活动;渭河盆地;中国黄土高原;

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