DOI: 10.1016/j.quascirev.2016.02.023
Scopus记录号: 2-s2.0-84959921486
论文题名: Cosmogenic 10Be constraints on Little Ice Age glacial advances in the eastern Tian Shan, China
作者: Li Y. ; Li Y. ; Harbor J. ; Liu G. ; Yi C. ; Caffee M.W.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 138 起始页码: 105
结束页码: 118
语种: 英语
英文关键词: Cosmogenic nuclides
; Eastern Tian Shan
; Little Ice Age glacial advances
; Nuclide inheritance
Scopus关键词: Deposits
; Ice
; Isotopes
; Maps
; Trees (mathematics)
; Central Asia
; Cosmogenic nuclides
; Eastern Tian Shan
; Glacial advances
; Glacial valleys
; Lake sediments
; Little Ice Age
; Topographic map
; Glacial geology
; boulder
; cosmogenic radionuclide
; glacier
; headwater
; ice core
; lacustrine deposit
; Little Ice Age
; moraine
; tree ring
; China
; Tien Shan
; Urumqi River
; Xinjiang Uygur
英文摘要: Presumed Little Ice Age (LIA) glacial advances, represented by a set of fresh, sharp-crested, boulder covered and compact moraines a few hundred meters downstream from modern glaciers, have been widely recognized in the Central Asian highlands. However, few studies have constrained the formation ages of these moraines. We report 31 10Be exposure ages from presumed LIA moraines in six glacial valleys in the Urumqi River headwater area and the Haxilegen Pass area of the eastern Tian Shan, China. Our results reveal that the maximum LIA glacial extent occurred mainly around 430 ± 100 yr, a cold and wet period as indicated by proxy data from ice cores, tree rings, and lake sediments in Central Asia. We also dated a later glacial advance to 270 ± 55 yr. However, 10Be exposure ages on several presumed LIA moraines in front of small, thin glaciers are widely scattered and much older than the globally recognized timing of the LIA. Historical topographic maps indicate that most glaciers were more extensive in the early 1960s, and two of our 10Be sample sites were located close to the ice front at that time. Boulders transported by these small and thin glaciers may be reworked from deposits originally formed prior to the LIA glacial advances, producing apparently old and widely scattered exposure ages due to varied nuclide inheritance. Other published ages indicated an earlier LIA advance around 790 ± 300 yr in the easternmost Tian Shan, but in our study area the more extensive advance around 430 ± 100 yr likely reworked or covered deposits from this earlier event. © 2016 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59634
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geography, South Dakota State University, Brookings, SD, United States; Department of Geography, The University of Tennessee, Knoxville, TN, United States; Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN, United States; College of Urban and Environmental Sciences, Peking University, Beijing, China; Institute of Tibetan Plateau Research, Chinese Academy of Sciences, CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, China; Department of Physics and Astronomy, Purdue University, West Lafayette, IN, United States
Recommended Citation:
Li Y.,Li Y.,Harbor J.,et al. Cosmogenic 10Be constraints on Little Ice Age glacial advances in the eastern Tian Shan, China[J]. Quaternary Science Reviews,2016-01-01,138