DOI: 10.1016/j.quascirev.2015.08.034
Scopus记录号: 2-s2.0-84941729381
论文题名: 10Be dating reveals early-middle Holocene age of the Drygalski Moraines in central West Greenland
作者: Cronauer S.L. ; Briner J.P. ; Kelley S.E. ; Zimmerman S.R.H. ; Morlighem M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 147 起始页码: 59
结束页码: 68
语种: 英语
英文关键词: Cosmogenic nuclide exposure dating
; Greenland Ice Sheet
; Holocene
; Proglacial-threshold lake
Scopus关键词: Catchments
; Glaciers
; Lakes
; Sediments
; Stratigraphy
; Cosmogenic nuclides
; Early Holocene
; Greenland Ice Sheet
; Holocenes
; Northern Hemispheres
; Ocean temperature
; Pro-glacial
; Proglacial lakes
; Ice
英文摘要: We reconstruct the history of the Greenland Ice Sheet margin on the Nuussuaq Peninsula in central West Greenland through the Holocene using lake sediment analysis and cosmogenic 10Be exposure dating of the prominent Drygalski Moraines. Erratics perched on bedrock outboard of the Drygalski Moraines constrain local deglaciation to ∼9.9 ± 0.6 ka (n = 2). Three Drygalski Moraine crests yield mean 10Be ages of 8.6 ± 0.4 ka (n = 2), 8.5 ± 0.2 ka (n = 3), and 7.6 ± 0.1 ka (n = 2) from outer to inner. Perched erratics between the inner two moraines average 7.8 ± 0.1 ka (n = 2) and are consistent with the moraine ages. Sediments from a proglacial lake with a catchment area extending an estimated 2 km beneath (inland of) the present ice sheet terminus constrain an ice sheet minimum extent from 5.4 ka to 0.6 ka. The moraine chronology paired with the lake sediment stratigraphy reveals that the ice margin likely remained within ∼2 km of its present position from ∼9.9 to 5.4 ka. This unexpected early Holocene stability, preceded by rapid ice retreat and followed by minimum ice extent between ∼5.4 and 0.6 ka, contrasts with many records of early Holocene warmth and the Northern Hemisphere summer insolation maximum. We suggest ice margin stability may instead be tied to adjacent ocean temperatures, which reached an optimum in the middle Holocene. © 2015 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59511
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geology, University at Buffalo, 411 Cooke Hall, Buffalo, NY, United States; Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA, United States; University of California, Irvine, Department of Earth System Science, Croul Hall, Irvine, CA, United States; Department of Earth and Environmental Sciences, University of Waterloo, 200 University Ave. W, Waterloo, ON, United States
Recommended Citation:
Cronauer S.L.,Briner J.P.,Kelley S.E.,et al. 10Be dating reveals early-middle Holocene age of the Drygalski Moraines in central West Greenland[J]. Quaternary Science Reviews,2016-01-01,147