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DOI10.1016/j.quageo.2018.05.007
Luminescence dating of a fluvial sequence using different grain size fractions and implications on Holocene flooding activities in Weihe Basin, central
He, Zhong1,2,4; Long, Hao2; Yang, Linhai3; Zhou, Jie1
发表日期2019
ISSN1871-1014
EISSN1878-0350
卷号49页码:123-130
英文摘要

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.


WOS研究方向Physical Geography ; Geology
来源期刊QUATERNARY GEOCHRONOLOGY
来源机构中国科学院西北资源环境生态研究院
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/93085
作者单位1.Chinese Acad Sci, Inst Soil & Water Conservat, Minist Water Resources, Yangling 712100, Shaanxi, Peoples R China;
2.Chinese Acad Sci NIGLAS, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing 210008, Jiangsu, Peoples R China;
3.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Desert & Desertificat, Lanzhou 730000, Gansu, Peoples R China;
4.Northwest A&F Univ, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China
推荐引用方式
GB/T 7714
He, Zhong,Long, Hao,Yang, Linhai,et al. Luminescence dating of a fluvial sequence using different grain size fractions and implications on Holocene flooding activities in Weihe Basin, central[J]. 中国科学院西北资源环境生态研究院,2019,49:123-130.
APA He, Zhong,Long, Hao,Yang, Linhai,&Zhou, Jie.(2019).Luminescence dating of a fluvial sequence using different grain size fractions and implications on Holocene flooding activities in Weihe Basin, central.QUATERNARY GEOCHRONOLOGY,49,123-130.
MLA He, Zhong,et al."Luminescence dating of a fluvial sequence using different grain size fractions and implications on Holocene flooding activities in Weihe Basin, central".QUATERNARY GEOCHRONOLOGY 49(2019):123-130.
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