Arid
DOI10.1016/j.quascirev.2017.10.016
Ice-dammed lateral lake and epishelf lake insights into Holocene dynamics of Marguerite Trough Ice Stream and George VI Ice Shelf, Alexander Island, Antarctic Peninsula
Davies, Bethan J.1,2; Hambrey, Michael J.2; Glasser, Neil F.2; Holt, Tom2; Rodes, Angel3; Smellie, John L.4; Carrivick, Jonathan L.5; Blockley, Simon P. E.1
通讯作者Davies, Bethan J.
来源期刊QUATERNARY SCIENCE REVIEWS
ISSN0277-3791
出版年2017
卷号177页码:189-219
英文摘要

We present new data regarding the past dynamics of Marguerite Trough Ice Stream, George VI Ice Shelf and valley glaciers from Ablation Point Massif on Alexander Island, Antarctic Peninsula. This ice-free oasis preserves a geological record of ice stream lateral moraines, ice-dammed lakes, ice-shelf moraines and valley glacier moraines, which we dated using cosmogenic nuclide ages. We provide one of the first detailed sediment-landform assemblage descriptions of epishelf lake shorelines. Marguerite Trough Ice Stream imprinted lateral moraines against eastern Alexander Island at 120 m at Ablation Point Massif. During deglaciation, lateral lakes formed in the Ablation and Moutonnee valleys, dammed against the ice stream in George VI Sound. Exposure ages from boulders on these shorelines yielded ages of 13.9 to 9.7 ka. Following recession of the ice stream, George VI Ice Shelf formed in George VI Sound. An epishelf lake formed at 15-20 m asl in Ablation and Moutonnee valleys, dated from 9.4 to 4.6 ka, suggesting that the lake was stable and persistent for some 5000 years. Lake-level lowering occurred after this, with the lake level at 12 mat 3.1 +/- 0.4 ka and at 5 m asl today. A readvance of the valley glaciers on Alexander Island at 4.4 +/- 0.7 ka is recorded by valley glacier moraines overlying epishelf lake sediments. We speculate that the glacier readvance, which occurred during a period of warmth, may have been caused by a dynamic response of the glaciers to a lowering in surface elevation of George VI Ice Shelf. (C) 2017 The Authors. Published by Elsevier Ltd.


英文关键词Holocene George VI Ice Shelf Marguerite Trough Ice Stream Antarctica Cosmogenic isotope dating Geomorphology
类型Article
语种英语
国家England ; Wales ; Scotland
收录类别SCI-E
WOS记录号WOS:000418203900013
WOS关键词LAST GLACIAL MAXIMUM ; JAMES-ROSS-ISLAND ; GEOMORPHOLOGICAL EVIDENCE ; DEGLACIAL HISTORY ; FLOW DYNAMICS ; EXPOSURE AGES ; DRY VALLEYS ; SURFACE ; SHEET ; RETREAT
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
来源机构University of London
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/201875
作者单位1.Royal Holloway Univ London, Quaternary Res Ctr, Egham TW20 0EX, Surrey, England;
2.Aberystwyth Univ, Inst Geog & Earth Sci, Ceredigion SY23 3DB, Wales;
3.SUERC, Rankine Ave, E Kilbride G75 0QF, Lanark, Scotland;
4.Univ Leicester, Dept Geol, Leicester LE1 7RH, Leics, England;
5.Univ Leeds, Sch Geog & Water Leeds, Woodhouse Lane, Leeds LS2 9JT, W Yorkshire, England
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Davies, Bethan J.,Hambrey, Michael J.,Glasser, Neil F.,et al. Ice-dammed lateral lake and epishelf lake insights into Holocene dynamics of Marguerite Trough Ice Stream and George VI Ice Shelf, Alexander Island, Antarctic Peninsula[J]. University of London,2017,177:189-219.
APA Davies, Bethan J..,Hambrey, Michael J..,Glasser, Neil F..,Holt, Tom.,Rodes, Angel.,...&Blockley, Simon P. E..(2017).Ice-dammed lateral lake and epishelf lake insights into Holocene dynamics of Marguerite Trough Ice Stream and George VI Ice Shelf, Alexander Island, Antarctic Peninsula.QUATERNARY SCIENCE REVIEWS,177,189-219.
MLA Davies, Bethan J.,et al."Ice-dammed lateral lake and epishelf lake insights into Holocene dynamics of Marguerite Trough Ice Stream and George VI Ice Shelf, Alexander Island, Antarctic Peninsula".QUATERNARY SCIENCE REVIEWS 177(2017):189-219.
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