DOI: 10.1016/j.quascirev.2016.08.028
Scopus记录号: 2-s2.0-84983793743
论文题名: Implications of 36Cl exposure ages from Skye, northwest Scotland for the timing of ice stream deglaciation and deglacial ice dynamics
作者: Small D. ; Rinterknecht V. ; Austin W.E.N. ; Bates R. ; Benn D.I. ; Scourse J.D. ; Bourlès D.L. ; Hibbert F.D.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 150 起始页码: 130
结束页码: 145
语种: 英语
英文关键词: Chlorine-36
; Cosmogenic exposure ages
; Deglaciation
; Scotland
Scopus关键词: Acoustic variables measurement
; Climate change
; Cosmic rays
; Cosmology
; Geochronology
; Glacial geology
; Glaciers
; British-Irish ice sheet
; Cosmogenic exposure
; Deglaciations
; External forcing
; Production methods
; Scaling schemes
; Scotland
; Swath bathymetry
; Ice
; chlorine isotope
; climate change
; climate forcing
; cosmic ray
; cosmogenic radionuclide
; deglaciation
; deposition
; geochronology
; ice sheet
; ice stream
; moraine
; proxy climate record
; swath bathymetry
; Barra
; County Donegal
; Donegal [County Donegal]
; Hebrides
; Highland
; Inner Hebrides
; Ireland
; Scotland
; Skye
; Ulster [Ireland]
; United Kingdom
; Western Isles
英文摘要: Geochronological constraints on the deglaciation of former marine based ice streams provide information on the rates and modes by which marine based ice sheets have responded to external forcing factors such as climate change. This paper presents new 36Cl cosmic ray exposure dating from boulders located on two moraines (Glen Brittle and Loch Scavaig) in southern Skye, northwest Scotland. Ages from the Glen Brittle moraines constrain deglaciation of a major marine terminating ice stream, the Barra-Donegal Ice Stream that drained the former British-Irish Ice Sheet, depending on choice of production method and scaling model this occurred 19.9 ± 1.5–17.6 ± 1.3 ka ago. We compare this timing of deglaciation to existing geochronological data and changes in a variety of potential forcing factors constrained through proxy records and numerical models to determine what deglaciation age is most consistent with existing evidence. Another small section of moraine, the Scavaig moraine, is traced offshore through multibeam swath-bathymetry and interpreted as delimiting a later stillstand/readvance stage following ice stream deglaciation. Additional cosmic ray exposure dating from the onshore portion of this moraine indicate that it was deposited 16.3 ± 1.3–15.2 ± 0.9 ka ago. When calculated using the most up-to-date scaling scheme this time of deposition is, within uncertainty, the same as the timing of a widely identified readvance, the Wester Ross Readvance, observed elsewhere in northwest Scotland. This extends the area over which this readvance has potentially occurred, reinforcing the view that it was climatically forced. © 2016 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59450
Appears in Collections: 过去全球变化的重建
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作者单位: School of Geography and Geosciences, University of St Andrews, St Andrews, United Kingdom; Université Paris 1 Panthéon-Sorbonne, CNRS Laboratoire de Géographie Physique, Meudon, France; Scottish Marine Institute, Scottish Association for Marine Sciences, Oban, United Kingdom; School of Ocean Sciences, Bangor University, Menai Bridge, Anglesey, United Kingdom; Aix-Marseille Université, CNRS-IRD-Collège de France, UM 34 CEREGE, Technopôle de l'Environnement Arbois-Méditerranée, BP80, Aix-en-Provence, France; Research School of Earth Sciences, The Australian National University, Canberra, ACT, Australia
Recommended Citation:
Small D.,Rinterknecht V.,Austin W.E.N.,et al. Implications of 36Cl exposure ages from Skye, northwest Scotland for the timing of ice stream deglaciation and deglacial ice dynamics[J]. Quaternary Science Reviews,2016-01-01,150