DOI: 10.1016/j.quascirev.2017.03.024
Scopus记录号: 2-s2.0-85016495689
论文题名: Triangular-shaped landforms reveal subglacial drainage routes in SW Finland
作者: Mäkinen J. ; Kajuutti K. ; Palmu J.-P. ; Ojala A. ; Ahokangas E.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 164 起始页码: 37
结束页码: 53
语种: 英语
英文关键词: Esker
; Geomorphology (glacial)
; Glaciation
; Ice stream
; LiDAR
; Quaternary
; Scandinavia
; Subglacial
; Triangular-shaped landforms
Scopus关键词: Drainage
; Erosion
; Geomorphology
; Glacial geology
; Glaciers
; Landforms
; Optical radar
; Esker
; Glaciation
; Ice streams
; Quaternary
; Scandinavia
; Subglacial
; Ice
英文摘要: The aim of this study is to present the first evidence of triangular-shaped till landforms and related erosional features indicative of subglacial drainage within the ice stream bed of the Scandinavian ice sheet in Finland. Previously unidentified grouped patterns of Quaternary deposits with triangular landforms can be recognized from LiDAR-based DEMs. The triangular landforms occur as segments within geomorphologically distinguishable routes that are associated with eskers. The morphological and sedimentological characteristics as well as the distribution of the triangular landforms are interpreted to involve the creep of saturated deforming till, flow and pressure fluctuations of subglacial meltwater associated with meltwater erosion. There are no existing models for the formation of this kind of large-scale drainage systems, but we claim that they represent an efficient drainage system for subglacial meltwater transfer under high pressure conditions. Our hypothesis is that the routed, large-scale subglacial drainage systems described herein form a continuum between channelized (eskers) and more widely spread small-scale distributed subglacial drainage. Moreover, the transition from the conduit dominated drainage to triangular-shaped subglacial landforms takes place about 50–60 km from the ice margin. We provide an important contribution towards a more realistic representation of ice sheet hydrological drainage systems that could be used to improve paleoglaciological models and to simulate likely responses of ice sheets to increased meltwater production. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59248
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geography and Geology, University of Turku, Turku, Finland; Geological Survey of Finland, P.O. Box 96 (Betonimiehenkuja 4), Espoo, Finland
Recommended Citation:
Mäkinen J.,Kajuutti K.,Palmu J.-P.,et al. Triangular-shaped landforms reveal subglacial drainage routes in SW Finland[J]. Quaternary Science Reviews,2017-01-01,164