DOI: 10.1016/j.quascirev.2013.10.036
Scopus记录号: 2-s2.0-84899966173
论文题名: Expanded Late Wisconsinan ice cap and ice sheet margins in the western Queen Elizabeth Islands, Arctic Canada
作者: Nixon F.C. ; England J.H.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 91 起始页码: 146
结束页码: 164
语种: 英语
英文关键词: Canada
; Glacial geomorphology
; Innuitian Ice Sheet
; Last Glacial Maximum
; Laurentide Ice Sheet
; Queen Elizabeth Islands
; Radiocarbon chronology
Scopus关键词: Geochronology
; Geomorphology
; Glacial geology
; Ice
; Landforms
; Snow
; Submarine geology
; Canada
; Glacial geomorphology
; Ice sheet
; Last Glacial Maximum
; Laurentide ice sheets
; Queen Elizabeth islands
; Radiocarbon chronology
; Glaciers
英文摘要: Recent mapping of surficial geology and geomorphology in the western Canadian High Arctic (Melville and Eglinton islands), together with new radiocarbon dates acquired from ice-contact raised marine sediments, document expanded late Wisconsinan ice limits for the northwest Laurentide Ice Sheet and the western Innuitian Ice Sheet. An extension of the northwestern margin of the Laurentide Ice Sheet onto Eglinton Island is proposed based on evidence from till containing erratics derived from the Canadian Shield and a pattern of meltwater channels indicating ice retreat offshore into M'Clure Strait. Expansion of the western Melville Island Ice Cap (part of the western, lowland sector of the Innuitian Ice Sheet) to its offshore late Wisconsinan limit was facilitated by coalescence with the Laurentide Ice Sheet, whose buttressing allowed thickening to occur. Estimates of ice extent and thickness (>500m) of the western Melville Island Ice Cap are in agreement with high marine limits (≤70masl). Lateral and proglacial meltwater channels, moraines and glaciomarine, glaciolacustrine and glaciofluvial deposits indicate radial retreat of the western Melville Island Ice Cap onto central highlands after ~13.0calkaBP. Older marine limit shorelines on southern Eglinton Island (~13.6calkaBP) are broadly synchronous with the early and rapid deglaciation of other areas formerly glaciated by the northwestern Laurentide Ice Sheet to the southeast and southwest (~14.2-13.6calkaBP). The collapse of the northwest Laurentide Ice Sheet in M'Clure Strait beginning at ~14.2calkaBP, in addition to prior inferred thinning, opens the possibility that it made a significant contribution to meltwater pulse 1A. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60319
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3, Canada
Recommended Citation:
Nixon F.C.,England J.H.. Expanded Late Wisconsinan ice cap and ice sheet margins in the western Queen Elizabeth Islands, Arctic Canada[J]. Quaternary Science Reviews,2014-01-01,91