DOI: 10.1016/j.quascirev.2015.02.003
Scopus记录号: 2-s2.0-84924176161
论文题名: New marine evidence for a late wisconsinan ice stream in amundsen gulf, arctic Canada
作者: MacLean B. ; Blasco S. ; Bennett R. ; Lakeman T. ; Hughes-Clarke J. ; Kuus P. ; Patton E.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 114 起始页码: 149
结束页码: 166
语种: 英语
英文关键词: Amundsen gulf
; Canadian arctic
; Drumlinoid features
; Glacial ice stream
; Ridge and groove lineations
Scopus关键词: Dolphins (structures)
; Glacial geology
; Landforms
; Sea ice
; Sediments
; Stratigraphy
; Underwater acoustics
; Amundsen gulf
; Canadian Arctic
; Drumlinoid features
; Glacial ice
; Ridge and groove lineations
; Ice
; bedform
; depositional environment
; dolphin
; glacial environment
; ice sheet
; ice stream
; Last Glacial Maximum
; mapping method
; marine environment
; moraine
; satellite data
; sonar
; Wisconsinan
; Amundsen Gulf
; Arctic
; Arctic Ocean
; Beaufort Sea
英文摘要: Amundsen Gulf and adjoining Dolphin and Union Strait and Coronation Gulf form the southwestern end of the Northwest Passage adjacent to the Beaufort Sea. Extensive high resolution multibeam sonar imagery and sub-bottom profiles of the seabed have been acquired, primarily in Amundsen Gulf, by ArcticNet and the Ocean Mapping Group at the University of New Brunswick. These data reveal a variety of seabed landforms including mega-scale glacial ridge and groove lineations, drumlins, moraines, iceberg scours, bedrock outcrops, and discontinuous sediment deposits of variable thickness. The lineations are widespread, especially in southeastern Amundsen Gulf. They resemble modern and paleo bedforms reported from Antarctica, Svalbard, Greenland and other Canadian Arctic channels, where they have been ascribed to ice streams.The glacial sole marks on the seabed in Amundsen Gulf and regional data from the adjacent mainland and islands outline the configuration of a glacial ice stream from the Laurentide Ice Sheet that occupied Amundsen Gulf and adjoining waterways during the Late Wisconsinan. Part of the northwestward flowing ice stream was deflected around the Colville Mountains on Victoria Island and rejoined the main ice stream in Amundsen Gulf by way of Prince Albert Sound. The grounded Amundsen Gulf ice stream extended northwestward to the outer slope in the Beaufort Sea where it was buttressed by Arctic Shelf Ice. Maximum ice stream extent is inferred to have been coincident with the Late Glacial Maximum. Multi-sequence ice-contact sediments and stratigraphic relations with glaciomarine sediments indicate that several ice advances and retreats occurred in the northwestern part of the gulf. Final retreat from the maximum position began prior to 13,000calyrBP and terrestrial dates indicate that the retreating ice front had reached Dolphin and Union Strait by about 12.5calkaBP. © 2015 . Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59966
Appears in Collections: 过去全球变化的重建
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作者单位: Geological Survey of Canada, Atlantic, Natural Resources Canada, Bedford Institute of Oceanography, Dartmouth, NS, Canada; Department of Earth Sciences, Dalhousie University, Halifax, NS, Canada; Ocean Mapping Group, University of New Brunswick, Fredericton, NB, Canada
Recommended Citation:
MacLean B.,Blasco S.,Bennett R.,et al. New marine evidence for a late wisconsinan ice stream in amundsen gulf, arctic Canada[J]. Quaternary Science Reviews,2015-01-01,114