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Comparison between luminescence and radiocarbon dating of late Quaternary loess from the Ili Basin in Central Asia
Song, YouGui1,2,3; Lai, ZhongPing4; Li, Yun1; Chen, Tao1; Wang, YiXuan4
2015-10-01
Source PublicationQUATERNARY GEOCHRONOLOGY
Volume30Pages:405-410
SubtypeArticle
AbstractDust 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.
KeywordOsl Chronology Radiocarbon Age Underestimation Loess In The Ili basIn Central Asia
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordREGENERATIVE-DOSE PROTOCOL ; QINGHAI-TIBETAN PLATEAU ; CHINESE LOESS ; GROWTH-CURVE ; QAIDAM BASIN ; NW CHINA ; TENGGER DESERT ; CLIMATE-CHANGE ; WESTERN CHINA ; OSL
Indexed BySCI
Language英语
WOS Research AreaPhysical Geography ; Geology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary
WOS IDWOS:000366538200044
Citation statistics
Document Type期刊论文
Identifierhttp://ir.isl.ac.cn/handle/363002/6284
Collection青海盐湖研究所知识仓储
中国科学院青海盐湖研究所
Affiliation1.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
Recommended Citation
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.
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