DOI: 10.1016/j.quascirev.2015.01.030
Scopus记录号: 2-s2.0-84922695224
论文题名: Discriminating between subglacial and proglacial lake sediments: An example from the Dänischer Wohld Peninsula, northern Germany
作者: Livingstone S.J. ; Piotrowski J.A. ; Bateman M.D. ; Ely J.C. ; Clark C.D.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 112 起始页码: 86
结束页码: 108
语种: 英语
英文关键词: Ice Sheet
; Northern Germany
; Optically Stimulated Luminescence dating
; Proglacial lake
; Sedimentology
; Subglacial lake
Scopus关键词: Deposits
; Glacial geology
; Ice
; Lakes
; Luminescence
; Sediment transport
; Sedimentation
; Sedimentology
; Ice sheet
; Northern Germany
; Optically stimulated luminescence
; Proglacial lakes
; Subglacial lakes
; Sediments
英文摘要: Subglacial lakes are common features of contemporary ice masses. However, they are rarely identified in the geological record. This is due to the difficulty in discriminating between subglacial and proglacial lake sediments; a proglacial origin is typically preferred as the 'simplest' explanation. We hypothesise that numerous deposits currently interpreted to record proglacial lake sedimentation may actually have a subglacial origin. Here we try and find ways of distinguishing proglacial from subglacial lake sediments by investigating three sites along the Dänischer Wohld Peninsula, northern Germany, which have been interpreted to record both proglacial and subglacial sedimentation. We identify two major phases of ice activity and associated lake formation during the Late Weichselian glaciation. (1) Proglacial lake formation at ~23ka in front of the advancing Baltic Ice Stream. This lake was subsequently overridden and the sediments glaciotectonised as ice continued to advance to its maximum extent. (2) Retreat of ice back into the Baltic Basin at ~19ka and formation of a proglacial lake that persisted for ~4ka. We suggest that subglacial lake activity may have occurred at two of the sites between 23 and 19ka. This is based on the presence of aggrading sediment deposits characterised by stratified/laminated diamictons and interbedded tabular to channelized sorted sediments, the juxtaposition of relatively undeformed waterlain sediment and subglacial till, absence of glaciotectonic thrusting and folding or of fining/coarsening successions and the geomorphic association with tunnel valleys to the south of the study area. The style of sedimentation and deformation provided the greatest insight into the discrimination of proglacially vs subglacially deposited glaciolacustrine sediments. The luminescence signal palaeodose distributions also offers a potentially powerful means of fingerprinting sediment transport pathways of young glacial systems. © 2015 The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60008
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geography, University of Sheffield, Sheffield, United Kingdom; Department of Geoscience, Aarhus University, Aarhus, Denmark
Recommended Citation:
Livingstone S.J.,Piotrowski J.A.,Bateman M.D.,et al. Discriminating between subglacial and proglacial lake sediments: An example from the Dänischer Wohld Peninsula, northern Germany[J]. Quaternary Science Reviews,2015-01-01,112