Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/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
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ISSN | 0277-3791 |
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 |
推荐引用方式 GB/T 7714 | 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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