DOI: 10.1016/j.quageo.2020.101054
论文题名: The last glaciation in the headwater area of the Xiaokelanhe River, Chinese Altai: Evidence from 10Be exposure-ages
作者: Dong G. ; Zhou W. ; Fu Y. ; Zhang L. ; Zhao G. ; Li M.
刊名: Quaternary Geochronology
ISSN: 18711014
出版年: 2020
卷: 56 语种: 英语
英文关键词: 10Be surface exposure dating
; Altai mountains
; Last glaciation
; Xiaokelanhe river basin
Scopus关键词: age determination
; beryllium isotope
; glacial landform
; headwater
; last glaciation
; moraine
; Altai Mountains
英文摘要: The timing and extent of the last glaciation in the Altai Mountains are key to understanding climate change in this critical region. However, robust glacial chronologies are sparse across the Altai Mountains, especially in the Chinese Altai, impeding the correlation of glacial events and examination of the possible climate forcing mechanisms. Here, we report twenty new 10Be exposure-ages obtained from two moraines in the headwater area of the Xiaokelanhe River, Chinese Altai. The inner latero-frontal moraine yields exposure-ages ranging from 16.60 ± 1.00 to 20.41 ± 1.15 ka (n = 5), reflecting a limited advance during the global Last Glacial Maximum (LGM). The morpho-stratigraphically older moraine remnants have exposure-ages of 14.36 ± 0.94–38.98 ± 2.23 ka (n = 15). The tentatively determined moraine age of 34.10 ± 4.99 ka suggests that the local LGM in the Xiaokelanhe River likely occurred during Marine Isotope Stage (MIS) 3 or earlier. From a compilation of the 20 new, and 79 previously published exposure-ages, we observe at least three distinct glacial events during the last glacial, with the local LGM occurring prior to MIS 2. A comparison between the timing of glacial activities and climate proxies suggests a potential combination of summer solar insolation, North Atlantic climate oscillations, and atmospheric CO2 levels, as triggers for glacial movements during the last glacial cycle. Precipitation delivered by the mid-latitude westerlies may have also contributed to glacial advances during MIS 3. These correlations remain tentative however, due to limited chronological control. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159148
Appears in Collections: 气候变化与战略
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作者单位: State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China; State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Science, Lanzhou, 730000, China; CAS Center for Excellence in Quaternary Science and Global Change, Xi'an, 710061, China; Shaanxi Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Xi'an AMS Center of IEECAS & Xi'an Jiaotong University, Xi'an, 710061, China
Recommended Citation:
Dong G.,Zhou W.,Fu Y.,et al. The last glaciation in the headwater area of the Xiaokelanhe River, Chinese Altai: Evidence from 10Be exposure-ages[J]. Quaternary Geochronology,2020-01-01,56