Comparison between luminescence and radiocarbon dating of late Quaternary loess from the Ili Basin in Central Asia

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	Comparison between luminescence and radiocarbon dating of late Quaternary loess from the Ili Basin in Central Asia
	Song, YouGui 1,2,3; Lai, ZhongPing 4; Li, Yun 1; Chen, Tao 1; Wang, YiXuan4
	2015-10-01
发表期刊	QUATERNARY GEOCHRONOLOGY
卷号	30 页码:405-410
关键词	Osl Chronology Radiocarbon Age Underestimation Loess In The Ili basIn Central Asia
摘要	Dust depositions are critical archives for understanding interior aridification and westerly climatic changes in Central Asia. Accurate and reliable dating of loess is very important for interpreting and correlating environmental records. There remains a disparity between luminescence ages and radiocarbon dating of late Quaternary loess from the Ili Basin in Central Asia. In this study, we establish a closely spaced quartz optically stimulated luminescence (OSL) chronology for the 20.5-m-thick Nilka loess section in the Ili Basin. Based on OSL ages, two intervals of higher mass accumulation rate occurred at 49-43 ka and 24-14 ka. We further compare these OSL ages with 23 accelerator mass spectrometry (AMS) C-14 ages of bulk organic matter. The results indicate that the OSL and radiocarbon ages agree well for ages younger than ca. 25 C-14 cal ka BP. However, beyond 30 cal ka BP, there is no consistent increase in AMS C-14 age with depth, while the OSL ages continue to increase. These differences confirm the observation that the AMS C-14 ages obtained using conventional acid-base-acid (ABA) pretreatment are severely underestimated in other terrestrial deposits in Central Asia, which could be due to 2-4% modern carbon contamination. However, OSL dating is applicable for constructing an accurate chronology beyond 30 cal ka BP. We suggest caution when interpreting paleoenvironmental changes based on radiocarbon ages older than 25 cal ka BP. (C) 2015 Elsevier B.V. All rights reserved.
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/6284
专题	青海盐湖研究所知识仓储中国科学院青海盐湖研究所
作者单位	1.Chinese Acad Sci, Inst Earth & Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China 2.China Univ Geosci, Sch Earth Sci, Luminescence Dating Lab, Wuhan 430074, Peoples R China 3.Joint Ctr Global Change Studies, Beijing 100875, Peoples R China 4.Chinese Acad Sci, Qinghai Inst Salt Lakes, Xining 810008, Peoples R China
推荐引用方式 GB/T 7714	Song, YouGui,Lai, ZhongPing,Li, Yun,et al. Comparison between luminescence and radiocarbon dating of late Quaternary loess from the Ili Basin in Central Asia[J]. QUATERNARY GEOCHRONOLOGY,2015,30:405-410.
APA	Song, YouGui,Lai, ZhongPing,Li, Yun,Chen, Tao,&Wang, YiXuan.(2015).Comparison between luminescence and radiocarbon dating of late Quaternary loess from the Ili Basin in Central Asia.QUATERNARY GEOCHRONOLOGY,30,405-410.
MLA	Song, YouGui,et al."Comparison between luminescence and radiocarbon dating of late Quaternary loess from the Ili Basin in Central Asia".QUATERNARY GEOCHRONOLOGY 30(2015):405-410.