DOI: 10.1016/j.quascirev.2014.11.019
Scopus记录号: 2-s2.0-84920149122
论文题名: Landscape chronology and glacial history in Thule, northwest Greenland
作者: Corbett L.B. ; Bierman P.R. ; Lasher G.E. ; Rood D.H.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 109 起始页码: 57
结束页码: 67
语种: 英语
英文关键词: Beryllium-10
; Cosmogenic nuclides
; Deglaciation
; Holocene
; Subglacial erosion
Scopus关键词: Glacial geology
; Glaciers
; Isotopes
; Sea level
; Stratigraphy
; Bimodal distribution
; Cosmogenic nuclides
; Deglaciations
; Greenland Ice Sheet
; Holocenes
; Last Glacial Maximum
; Radiocarbon dating
; Stratigraphic analysis
; Ice
; glacial history
; glacial landform
; ice sheet
; Last Glacial Maximum
; marine ecosystem
; mollusc
; rock property
; Arctic
; Greenland
; Greenland Ice Sheet
; Thule
; Mollusca
英文摘要: Constraining past responses of ice sheets to changes in climate enhances our ability to predict future changes in ice extent and sea level. Here, we employ surficial geologic mapping, stratigraphic analysis, radiocarbon dating of marine mollusks, and analysis of cosmogenic 10Be in glacially-deposited boulders to make inferences about past ice extents in Thule, northwest Greenland. Our work shows the existence of two distinct diamict units in the Thule area; we infer that one diamict was deposited by the main Greenland Ice Sheet while the second was deposited by a subsequent outlet glacier re-advance. Boulders in the two diamicts (n=13 and n=15, respectively) have similar bimodal distributions of cosmogenic 10Be ages. Both diamicts have a group of younger 10Be ages as well as a more diffuse group of considerably older 10Be ages (~20-30ka). Many of the boulders likely contain nuclides inherited from previous periods of exposure, suggesting that glacial ice in the Thule region has been cold-based and non-erosive in the past. The landscape chronology we develop suggests that deglaciation after the Last Glacial Maximum occurred ~10.8ka and was later followed by a re-advance of outlet glaciers, possibly in concert with the 9.3ka or 8.2ka cold events. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60040
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geology and Rubenstein School of Environment and Natural Resources, University of Vermont, Burlington, VT, United States; Department of Earth and Planetary Sciences, Northwestern University, Evanston, IL, United States; Department of Earth Science and Engineering, Imperial College London, South Kensington Campus, London, United Kingdom; Scottish Universities Environmental Research Centre (SUERC), East Kilbride, United Kingdom
Recommended Citation:
Corbett L.B.,Bierman P.R.,Lasher G.E.,et al. Landscape chronology and glacial history in Thule, northwest Greenland[J]. Quaternary Science Reviews,2015-01-01,109