气候变化领域集成服务门户(CCPortal): Chronology of a lacustrine core from Lake Linggo Co using a combination of OSL, C-14 and Pb-210 dating: implications for the dating of lacustrine sediments from the Tibetan Plateau

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DOI	10.1111/bor.12291
	Chronology of a lacustrine core from Lake Linggo Co using a combination of OSL, C-14 and Pb-210 dating: implications for the dating of lacustrine sediments from the Tibetan Plateau
	Hu, Gang; Yi, Chaolu; Zhang, Jiafu; Cao, Guirong; Pan, Baolin; Liu, Jinhua; Jiang, Tao; Yi, Shuangwen; Li, Dehong; Huang, Jianwei
通讯作者	Yi, CL (通讯作者)
发表日期	2018
ISSN	0300-9483
EISSN	1502-3885
起始页码	656
结束页码	670
卷号	47 期号:2
英文摘要	Vast palaeolakes once occupied the Qinghai-Tibetan Plateau (TP). Analyses of the sedimentary records of these lakes could potentially provide an extensive dating archive. Many previously constructed age-depth models simulating lacustrine cores have been principally based on radiocarbon (C-14) dating. However, such dating could have been hampered by the so-called lake reservoir effect' (LRE) and the reworking of lakebed sediments, resulting in inaccurate C-14 age-depth models and limiting interpretations of existing lacustrine palaeoclimatic records. Lake Linggo Co is located on the central TP, in one of the coldest and most arid regions of Tibet. We dated a 9.87-m-long lacustrine core extracted from the lakebed at a water depth of similar to 60m using a combination of Pb-210, C-14 and optically stimulated luminescence (OSL) techniques. Some C-14 ages showed significant age reversals; all the C-14 ages were much older than the Pb-210 and OSL ages for the same depths. This could possibly be attributed to the presence of old, inherited carbon, causing the inherited C-14 age to appear unstable during the deposition period. The Pb-210 and OSL ages were roughly concordant, and were also consistent with the stratigraphical succession. We therefore suggest that C-14 dating may, on its own, be inadequate for accurate dating of lacustrine sediment sites on the TP, and that the OSL method should also be applied in order to evaluate the reliability of any C-14 ages. With this approach, we constructed an age-depth model, revealing sedimentation rates of 1.7, 0.8, 6.8 and 0.6mm a(-1) between 0-1.9, 1.9-4.2, 4.2-4.4 and 4.4-9.4 ka, respectively.
关键词	OPTICALLY STIMULATED LUMINESCENCE HIGH-RESOLUTION OSL TANGRA YUMCO GRAIN-SIZE ENVIRONMENTAL-CHANGES LEVEL CHANGES SINGLE-GRAIN LOESS SITE LOP NUR MONSOON
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000428369500019
来源期刊	BOREAS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259354
推荐引用方式 GB/T 7714	Hu, Gang,Yi, Chaolu,Zhang, Jiafu,et al. Chronology of a lacustrine core from Lake Linggo Co using a combination of OSL, C-14 and Pb-210 dating: implications for the dating of lacustrine sediments from the Tibetan Plateau[J]. 中国科学院青藏高原研究所,2018,47(2).
APA	Hu, Gang.,Yi, Chaolu.,Zhang, Jiafu.,Cao, Guirong.,Pan, Baolin.,...&Huang, Jianwei.(2018).Chronology of a lacustrine core from Lake Linggo Co using a combination of OSL, C-14 and Pb-210 dating: implications for the dating of lacustrine sediments from the Tibetan Plateau.BOREAS,47(2).
MLA	Hu, Gang,et al."Chronology of a lacustrine core from Lake Linggo Co using a combination of OSL, C-14 and Pb-210 dating: implications for the dating of lacustrine sediments from the Tibetan Plateau".BOREAS 47.2(2018).