DOI: 10.1016/j.quascirev.2017.05.021
Scopus记录号: 2-s2.0-85020538091
论文题名: Seafloor geomorphology and glacimarine sedimentation associated with fast-flowing ice sheet outlet glaciers in Disko Bay, West Greenland
作者: Streuff K. ; Ó Cofaigh C. ; Hogan K. ; Jennings A. ; Lloyd J.M. ; Noormets R. ; Nielsen T. ; Kuijpers A. ; Dowdeswell J.A. ; Weinrebe W.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 169 起始页码: 206
结束页码: 230
语种: 英语
英文关键词: Deglaciation
; Glacial geomorphology
; Greenland
; Holocene
; Sedimentology
; Tidewater glaciers
Scopus关键词: Geographic information systems
; Geomorphology
; Glacial geology
; Glaciers
; Landforms
; Lithology
; Sea ice
; Sedimentology
; Sediments
; Suspended sediments
; Deglaciations
; Glacial geomorphology
; Greenland
; Holocenes
; Tidewater glaciers
; Ice
; continental shelf
; deglaciation
; geomorphological mapping
; Holocene
; ice flow
; ice sheet
; iceberg
; seafloor mapping
; sedimentation rate
; tidewater glacier
; Arctic
; Disko Bay
; East Greenland
; Greenland
; Greenland Ice Sheet
; Vaigat Strait
; West Greenland
英文摘要: Fast-flowing outlet glaciers currently drain the Greenland Ice Sheet (GIS), delivering ice, meltwater and debris to the fjords around Greenland. Although such glaciers strongly affect the ice sheet's mass balance, their glacimarine processes and associated products are still poorly understood. This study provides a detailed analysis of lithological and geophysical data from Disko Bay and the Vaigat Strait in central West Greenland. Disko Bay is strongly influenced by Jakobshavn Isbræ, Greenland's fastest-flowing glacier, which currently drains ∼7% of the ice sheet. Streamlined glacial landforms record the former flow of an expanded Jakobshavn Isbræ and adjacent GIS outlets through Disko Bay and the Vaigat Strait towards the continental shelf. Thirteen vibrocores contain a complex set of lithofacies including diamict, stratified mud, interbedded mud and sand, and bioturbated mud deposited by (1) suspension settling from meltwater plumes and the water column, (2) sediment gravity flows, and (3) iceberg rafting and ploughing. The importance of meltwater-related processes to glacimarine sedimentation in West Greenland fjords and bays is emphasised by the abundance of mud preserved in the cores. Radiocarbon dates constrain the position of the ice margin during deglaciation, and suggest that Jakobshavn Isbræ had retreated into central Disko Bay before 10.6 cal ka BP and to beyond Isfjeldsbanken by 7.6–7.1 cal ka BP. Sediment accumulation rates were up to 1.7 cm a−1 for ice-proximal glacimarine mud, and ∼0.007–0.05 cm a−1 for overlying distal sediments. In addition to elucidating the deglacial retreat history of Jakobshavn Isbræ, our findings show that the glacimarine sedimentary processes in West Greenland are similar to those in East Greenland, and that variability in such processes is more a function of time and glacier proximity than of geographic location and associated climatic regime. © 2017 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59178
Appears in Collections: 过去全球变化的重建
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作者单位: Durham University, Department of Geography, South Road, Durham, United Kingdom; British Antarctic Survey, Natural Environmental Research Council, High Cross, Madingley Road, Cambridge, United Kingdom; INSTAAR and Department of Geological Sciences, University of Colorado, Boulder, CO, United States; The University Centre in Svalbard (UNIS), P.O. Box 156, Longyearbyen, Norway; Geological Survey of Denmark and Greenland, Øster Voldgade 10, Copenhagen, Denmark; Scott Polar Research Institute, University of Cambridge, Lensfield Road, Cambridge, United Kingdom; GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 1-3, Kiel, Germany
Recommended Citation:
Streuff K.,Ó Cofaigh C.,Hogan K.,et al. Seafloor geomorphology and glacimarine sedimentation associated with fast-flowing ice sheet outlet glaciers in Disko Bay, West Greenland[J]. Quaternary Science Reviews,2017-01-01,169