DOI: 10.1016/j.quascirev.2013.05.002
Scopus记录号: 2-s2.0-84879309601
论文题名: Glaciation style and the geomorphological record: Evidence for Younger Dryas glaciers in the eastern Lake District, northwest England
作者: McDougall D.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 73 起始页码: 48
结束页码: 58
语种: 英语
英文关键词: Glaciation style
; Glacier reconstructions
; Icefield
; Lake District
; Loch Lomond Stadial
; Moraines
; Younger Dryas
Scopus关键词: Glaciation style
; Glacier reconstruction
; Icefield
; Loch Lomond Stadial
; Moraines
; Younger Dryas
; Climate change
; Ice
; Lakes
; Landforms
; Repair
; Glacial geology
; geomorphological mapping
; glaciation
; ice field
; ice free corridor
; moraine
; paleoclimate
; reconstruction
; Younger Dryas
; Cumbria
; England
; Lake District
; United Kingdom
英文摘要: The Younger Dryas (. c. 12,900-11,700 years ago) in Britain witnessed renewed glaciation, with the readvance of ice masses that had survived the preceding Lateglacial Interstadial as well as the formation of new glaciers. The extents of these former glaciers have been mapped by many workers over the past fifty years, usually as a basis for palaeoclimatic investigations. It has frequently been asserted that the landform record is sufficiently clear to allow accurate ice mass reconstructions at or near maximum extents. Detailed geomorphological mapping in the eastern Lake District in NW England, however, demonstrates that this confidence may not always be warranted. Whereas previous workers have interpreted the well-developed moraines that exist in some locations as evidence for an alpine-style of glaciation, with ice restricted to a small number of valleys, this study shows that the most recent glaciation to affect the area was characterised by: (i) extensive summit icefields, which supplied ice to the surrounding valleys; and (ii) a much greater volume of ice in the valleys than previously thought. The discovery that summit icefields were relatively common at this time is consistent with recent studies elsewhere in the Lake District and beyond. More significant, however, is the recognition that changing glacier-topographic interactions over both space and time appears to have had a profound impact on valley-floor glacial landform development, with the absence of clear moraines not necessarily indicating ice-free conditions at this time. This complicates glacier reconstructions based solely on the geomorphological record. Similar geomorphological complexity may be present in other areas that previously supported summit icefields, and this needs to be taken into account in glacier reconstructions. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60591
Appears in Collections: 过去全球变化的重建
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作者单位: Institute of Science and the Environment, University of Worcester, Henwick Grove, Worcester WR2 6AJ, United Kingdom
Recommended Citation:
McDougall D.. Glaciation style and the geomorphological record: Evidence for Younger Dryas glaciers in the eastern Lake District, northwest England[J]. Quaternary Science Reviews,2013-01-01,73