| DOI: | 10.1016/j.quascirev.2013.05.025
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| Scopus记录号: | 2-s2.0-84900429042
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| 论文题名: | The physiography of High Arctic cross-shelf troughs |
| 作者: | Batchelor C.L.; Dowdeswell J.A.
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| 刊名: | Quaternary Science Reviews
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| ISSN: | 2773791
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| 出版年: | 2014
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| 卷: | 92 | | 起始页码: | 68
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| 结束页码: | 96
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| 语种: | 英语
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| 英文关键词: | Cross-shelf troughs
; High Arctic
; Palaeo-ice streams
; Quaternary
; Trough-mouth fans
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| Scopus关键词: | Bathymetry
; Geomorphology
; Sedimentology
; Continental margin
; Cross-shelf troughs
; Glacigenic debris
; High arctic
; Palaeo-ice streams
; Quaternary
; Queen Elizabeth islands
; Submarine slope failures
; Glacial geology
; bathymetry
; continental margin
; depocenter
; erosion
; ice stream
; Quaternary
; sediment transport
; submarine slope
; trough
; Arctic
; Arctic Ocean
; Barents Sea
; Beaufort Sea
; Canada
; Greenland
; Kara Sea
; Queen Elizabeth Islands
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| 英文摘要: | A comprehensive inventory of High Arctic cross-shelf troughs is compiled from International Bathymetric Chart of the Arctic Ocean (IBCAO) bathymetric data (v. 3.0). The location of 75 cross-shelf troughs is presented alongside a synthesis of their key physiographic characteristics and available glacial-geological evidence. The troughs are interpreted to have been occupied intermittently and eroded by marine-terminating ice streams that traversed the shelf during at least one, and often many Quaternary full-glacial periods. Considerable variation in cross-shelf trough physiography exists in the High Arctic; trough lengths range between 35 and 1400km, widths from 12 to 260km, and maximum depths from 200 to 1000m. The longest cross-shelf troughs extend through inter-island channels on the Beaufort Sea, Queen Elizabeth Islands and Barents-Kara Sea margins. The gradient of the upper-slope beyond High Arctic glacial troughs, which ranges between 0.3° and 13°, is shown to have a negative relationship with palaeo-ice stream drainage basin area and trough length. Glacial-sedimentary depocentres or trough-mouth fans (TMFs) are inferred on the basis of bathymetric and, where available, seismic evidence, to exist beyond the majority of High Arctic cross-shelf troughs. Evidence of shelf progradation or TMF development is absent from the slope beyond several High Arctic troughs, probably as a result of limited sediment supply to the margin and/or sediment by-passing of the upper-slope. On the South Greenland continental margin, it is likely that steep slopes prevented the development of significant glacial-sedimentary depocentres beyond cross-shelf troughs or that glacigenic debris has been removed from the upper-slope by submarine slope failure. © 2013 Elsevier Ltd. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/60288
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| Appears in Collections: | 过去全球变化的重建
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作者单位: | Scott Polar Research Institute, University of Cambridge, Cambridge CB2 1ER, United Kingdom
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| Recommended Citation: | |
Batchelor C.L.,Dowdeswell J.A.. The physiography of High Arctic cross-shelf troughs[J]. Quaternary Science Reviews,2014-01-01,92
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