DOI: 10.1016/j.quascirev.2013.07.016
Scopus记录号: 2-s2.0-84900425020
论文题名: Widespread, multi-source glacial erosion on the Chukchi margin, Arctic Ocean
作者: Dove D. ; Polyak L. ; Coakley B.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 92 起始页码: 112
结束页码: 122
语种: 英语
英文关键词: Arctic Ocean
; Chukchi Sea
; Glacigenic bedforms
; Marine geophysics
; Quaternary glaciations
; Submarine geomorphology
Scopus关键词: Bathymetry
; Erosion
; Geophysics
; Sea ice
; Submarine geology
; Arctic ocean
; Bedforms
; Chukchi Sea
; Marine geophysics
; Quaternary glaciations
; Glacial geology
; bedform
; continental shelf
; debris flow
; geomorphological mapping
; glacial erosion
; glacial history
; glaciation
; ice margin
; ice sheet
; ice shelf
; iceberg
; lineation
; research vessel
; Arctic Ocean
; Chukchi Sea
; Chukchi Shelf
英文摘要: Multibeam bathymetry and sub-bottom profiler data acquired in 2011 from R/V Marcus Langseth in a broad grid over the Chukchi Sea margin reveal multiple glacigenic features on the top and slopes of the outer Chukchi Shelf/Rise and adjacent Borderland. Glacial lineations record a complex pattern of erosion likely formed by both local glaciation and far-traveled ice shelves/streams sourced from the Laurentide, and possibly East Siberian ice sheets. Multiple till units and stacked debris flows indicate recurrent glacial grounding events. Composite till wedges of several hundred meters thick extend the shelf edge by 10-20km in places. Distribution of ice-marginal features on the Chukchi Rise suggests stepwise deglacial retreat towards the shelf, backing up the broad bathymetric trough at the eastern side of the Rise. Glacigenic features other than extensive iceberg scouring cannot be identified above 350-m depth, and no glacigenic bedforms are present on the current-swept shallow shelf. Despite the resulting uncertainty with the southern extent of the glaciation, the data suggest a widespread grounded-ice presence on the northern Chukchi Shelf, which makes it an important, previously underestimated component of the Arctic paleo-glacial system. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60301
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 Rd., Edinburgh EH9-1JG, United Kingdom; Byrd Polar Research Center, Ohio State University, 1090 Carmack Rd., Columbus, OH 43210, United States; Geophysical Institute, University of Alaska Fairbanks, 900 Yukon Drive, Fairbanks, AK 99775, United States
Recommended Citation:
Dove D.,Polyak L.,Coakley B.. Widespread, multi-source glacial erosion on the Chukchi margin, Arctic Ocean[J]. Quaternary Science Reviews,2014-01-01,92