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DOI | 10.1016/j.quascirev.2020.106175 |
Cosmogenic 10Be and 26Al exposure dating of Nam Co lake terraces since MIS 5; southern Tibetan Plateau | |
Zhou J.; Zhou W.; Dong G.; Hou Y.; Xian F.; Zhang L.; Tang L.; Zhao G.; Fu Y. | |
发表日期 | 2020 |
ISSN | 0277-3791 |
卷号 | 231 |
英文摘要 | Lake paleo-shorelines can be used to reconstruct lake level fluctuations, which serve as sensitive indicators of climate change. The Tibetan Plateau (TP) contains the highest areal proportion of lakes in China, and dramatic past lake level changes have led to the formation of numerous relict shorelines. Here, we present 24 10Be and 26Al exposure-ages for five of seven lake terraces situated north of Nam Co, on the southern TP. The ages of four high stands marked by terraces (T7, T6, T5, and T4) are 81.5 ± 9.0 ka, 33.6 ± 1.9 ka, 19.9 ± 1.9 ka, and 15.2 ± 0.4 ka. The topographically highest terrace, T7, correlates with periods of enhanced Indian summer monsoon (ISM) and supports an MIS 5 maximum lake expansion on the TP, as opposed to MIS 3. Ages of two lower terraces (T5 and T4) possibly correspond to Melt Water Pulse (MWP) events. We also evaluate different possible sources of uncertainty from geologic processes on 10Be exposure ages of lake terraces. Subaerial erosion following terrace exposure has the most significant influence on 10Be exposure ages on ancient high terraces (for example > 80 ka), while inherited 10Be from prior exposure and partial shielding by shallow water, beach or talus are the most important geological source error of 10Be exposure ages for relatively low and young terraces (for example < 15 ka). © 2020 Elsevier Ltd |
英文关键词 | 10Be–26Al exposure dating; Lake terrace; Lake-level fluctuations; MIS 5; Nam Co; Tibetan Plateau |
语种 | 英语 |
scopus关键词 | Climate change; Geologic process; Indian summer monsoon; Lake level changes; Lake level fluctuations; Sensitive indicator; Shallow waters; Sources of uncertainty; Tibetan Plateau; Lakes; aluminum; beryllium isotope; cosmogenic radionuclide; dating method; lake level; marine isotope stage; pollution exposure; terrace; China; Nam Co; Qinghai-Xizang Plateau; Xizang |
来源期刊 | Quaternary Science Reviews
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文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/151574 |
作者单位 | State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Center for Excellence in Quaternary Science and Global Change, Chinese Academy of Sciences, Xi'an, 710061, China; Shaanxi Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Xi'an AMS Center, Xi'an, 710061, China; Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, 710049, China; Interdisciplinary Research Center of Earth Science Frontier, Beijing Normal University, Beijing, 100875, China; Open Studio for Oceanic-Continental Climate and Environment Changes, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao, 266061, China |
推荐引用方式 GB/T 7714 | Zhou J.,Zhou W.,Dong G.,et al. Cosmogenic 10Be and 26Al exposure dating of Nam Co lake terraces since MIS 5; southern Tibetan Plateau[J],2020,231. |
APA | Zhou J..,Zhou W..,Dong G..,Hou Y..,Xian F..,...&Fu Y..(2020).Cosmogenic 10Be and 26Al exposure dating of Nam Co lake terraces since MIS 5; southern Tibetan Plateau.Quaternary Science Reviews,231. |
MLA | Zhou J.,et al."Cosmogenic 10Be and 26Al exposure dating of Nam Co lake terraces since MIS 5; southern Tibetan Plateau".Quaternary Science Reviews 231(2020). |
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