DOI: 10.1016/j.quascirev.2013.10.035
Scopus记录号: 2-s2.0-84900442356
论文题名: Dynamics and retreat of the Late Weichselian Kongsfjorden ice stream, NW Svalbard
作者: Henriksen M. ; Alexanderson H. ; Landvik J.Y. ; Linge H. ; Peterson G.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 92 起始页码: 235
结束页码: 245
语种: 英语
英文关键词: Deglaciation
; Ice stream dynamics
; Surface exposure dating
; Svalbard
Scopus关键词: Dynamics
; Flowing wells
; Glacial geology
; Deglaciations
; Glacial landforms
; Ice streams
; Ice surface elevation
; Surface exposure age
; Surface exposure dating
; Svalbard
; Terrestrial cosmogenic nuclides
; Ice
; cosmogenic radionuclide
; deglaciation
; geological mapping
; glacier dynamics
; Holocene
; ice retreat
; ice stream
; ice thickness
; lamination
; moraine
; radiocarbon dating
; sea ice
; tidewater glacier
; Younger Dryas
; Arctic
; Kongsfjorden
; Spitsbergen
; Svalbard
; Svalbard and Jan Mayen
英文摘要: Terrestrial cosmogenic nuclide dating in combination with detailed landform mapping in the Kongsfjordhallet area, NW Svalbard, have provided new insight on configuration, dynamics, and deglaciation of the Late Weichselian Kongsfjorden ice stream. The minimum Late Weichselian ice surface elevation in Kongsfjorden was>449ma.s.l. indicating considerably thicker ice and a steeper surface gradient than earlier suggested. For the adjacent inter-ice stream area an even steeper surface slope is reconstructed. The glacial landforms, as well as the surface exposure ages of erratic boulders at different elevations, suggest a gradual lowering of the ice surface. Deglaciation of the higher elevations was probably underway by 20.0ka. At ca16.6ka a large moraine complex ('the Kongsfjorden moraine') was deposited close to the fjord mouth. The shape of the moraines, the steep ice surface gradient, as well as the correlation to fine laminated clay lacking ice rafted debris deposited in the trough beyond the moraine suggest that ice dynamics switched from ice-stream behaviour to a slower flowing outlet (tidewater) glacier. A Younger Dryas or Early Holocene advance of local valley glaciers is shown by moraine lobes cross-cutting the Late Weichselian lateral moraines. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60281
Appears in Collections: 过去全球变化的重建
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作者单位: Norwegian University of Life Sciences, Department of Environmental Sciences, P.O. Box 5003, NO-1432 Ås, Norway; Lund University, Department of Geology, Sölvegatan 12, SE-223 62 Lund, Sweden; University of Bergen, Department of Earth Science, P.O. Box 7800, NO-5020 Bergen, Norway; Geological Survey of Sweden, Box 670, SE-751 28 Uppsala, Sweden
Recommended Citation:
Henriksen M.,Alexanderson H.,Landvik J.Y.,et al. Dynamics and retreat of the Late Weichselian Kongsfjorden ice stream, NW Svalbard[J]. Quaternary Science Reviews,2014-01-01,92