DOI: 10.1016/j.quascirev.2013.10.009
Scopus记录号: 2-s2.0-84888041813
论文题名: Growth and decay of a marine terminating sector of the last British-Irish Ice Sheet: A geomorphological reconstruction
作者: Finlayson A. ; Fabel D. ; Bradwell T. ; Sugden D.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 83 起始页码: 28
结束页码: 45
语种: 英语
英文关键词: British-Irish Ice Sheet
; Glacial landscape
; Malin Shelf
; Marine terminating
; Palaeoglaciology
Scopus关键词: British-Irish ice sheet
; Glacial landscapes
; Malin Shelf
; Marine terminating
; Palaeoglaciology
; Glacial geology
; Glaciers
; Ice
; coastal morphology
; continental shelf
; glacial landform
; glaciology
; ice flow
; ice sheet
; iceberg calving
; reconstruction
; subglacial environment
; tidewater glacier
; upland region
; Atlantic Ocean
; Malin Shelf
; Scotland
; United Kingdom
英文摘要: The boundary conditions that govern ice sheet dynamics can change significantly with the development of marine margins. This paper uses the glacial landscape in western Scotland to reconstruct changes in the British-Irish Ice Sheet that accompanied the growth and decay of a marine sector over the Malin Shelf. Ice advanced from a restricted mountain ice sheet with tidewater margins after ~35kaBP, and reached the continental shelf in ~7ka (average rate of ~30ma-1). Early ice flow had been directed through north-south, geologically controlled, over-deepened fjords that were carved during previous 'restricted' glaciations. This flow regime was abandoned with development of the Malin Shelf ice sheet sector; ice flow direction switched by ~90° and was drawn westwards towards the shelf edge. The marine ice sheet phase saw episodes of west-east ice divide migration by up to 60km over west central Scotland, possibly linked to ice streaming and calving events at the ice sheet margin. However, permanent and stationary ice divides and zones of cold-based ice, associated with subglacial topographic highs, also characterised the marine glacial stage over western Scotland. The North Channel ice divide remained a constant, though migratory feature while the BIIS occupied the Malin Shelf; it finally collapsed at the end of the Killard Point Stadial when the Irish Ice Sheet began to rapidly decay ~16.5kaBP. This permitted the Scottish Ice Sheet to temporarily advance over north-east Ireland (previously identified as the East Antrim Coastal Readvance) before it too retreated, at rates in the order of 102ma-1. Although the imprint of extensive shelf-edge ice sheet glaciation exists in the coastal landscape of western Scotland, the dominant landscape features relate to a restricted, marine-proximal mountain ice sheet with markedly different flow configurations. Similar first-order geomorphological features, relating to 'restricted' glacial conditions, are likely to be preserved in subglacial highlands under interior parts of modern ice sheets.© 2013 c Natural Environment Research Council. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60422
Appears in Collections: 过去全球变化的重建
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作者单位: British Geological Survey, Murchison House, West Mains Road, Edinburgh EH93LA, United Kingdom; Department of Geographical and Earth Sciences, University of Glasgow, Glasgow G128QQ, United Kingdom; Institute of Geography, University of Edinburgh, Drummond Street, Edinburgh EH89XP, United Kingdom
Recommended Citation:
Finlayson A.,Fabel D.,Bradwell T.,et al. Growth and decay of a marine terminating sector of the last British-Irish Ice Sheet: A geomorphological reconstruction[J]. Quaternary Science Reviews,2014-01-01,83