DOI: 10.1016/j.quascirev.2017.01.019
论文题名: Pleistocene iceberg dynamics on the west Svalbard margin: Evidence from bathymetric and sub-bottom profiler data
作者: Zhao F. ; Minshull T.A. ; Crocker A.J. ; Dowdeswell J.A. ; Wu S. ; Soryal S.M.
刊名: Quaternary Science Reviews
出版年: 2017
卷: 161 起始页码: 30
结束页码: 44
语种: 英语
英文关键词: Iceberg ploughmarks
; Icebergs
; Pleistocene
; West Spitsbergen Current
; Western Svalbard margin
Scopus关键词: Glacial geology
; Glaciers
; Sediments
; Stratigraphy
; Iceberg ploughmarks
; Icebergs
; Pleistocene
; Svalbard
; West spitsbergen currents
; Sea ice
; bathymetric survey
; iceberg
; Pleistocene
; plowing
; profiler
; sea ice
; seafloor mapping
; seismic stratigraphy
; Weichselian
; Arctic
; Arctic Ocean
; Arctic Ocean
; Atlantic Ocean
; Barents Sea
; Fram Strait
; Greenland Sea
; Norwegian Sea
; Svalbard Margin
; West Spitsbergen Current
英文摘要: Large icebergs leave evidence of their drift via ploughing of the seabed, thereby providing a geological record of episodes of calving from thick ice sheets. We interpret large-scale curvilinear depressions on the western Svalbard margin as ploughmarks produced by the keels of icebergs that grounded on the seafloor as they drifted through this area. Iceberg ploughmarks were identified at modern water depths between 300 m and 1000 m and in two distinct stratigraphic units. Combining data from sediment cores with seismic stratigraphy from sub-bottom profiler data suggests that the ploughmarks developed in two phases: (1) during Marine Isotope Stage (MIS) 6; and (2) during MIS 2, indicating the presence of large drifting icebergs on the western Svalbard margin during both the Late Saalian and Late Weichselian glaciations. Sediment-core data along the western Svalbard margin indicate a sharp increase in mass-transported sediments dated at 23.7 ± 0.2 ka, consistent with the MIS 2 age of the younger iceberg-ploughed surface. The ploughmarks are oriented in two main directions: SW-NE and S-N. S-N oriented ploughmarks, which shallow to the north, indicate iceberg drift from the south with a SW–NE component marking the zone of splitting of the West Spitsbergen Current (WSC) into the Yermak Slope Current (YSC) and North Spitsbergen Current (NSC). Large MIS 6 and MIS 2 icebergs most likely had an Arctic Ocean source. We suggest that these icebergs probably left the Arctic Ocean southward through Fram Strait and circulated within the Norwegian-Greenland Sea before being transported northwards along the Svalbard margin by the WSC. An additional likely source of icebergs to the western Svalbard margin during MIS 2 was the ice-sheet terminating in the western Barents Sea, from which icebergs drifted northward. © 2017 Elsevier Ltd 资助项目: Zhao, F.
; CAS Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of SciencesChina
; 电子邮件: zhaofangiocas@gmail.com
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59282
Appears in Collections: 过去全球变化的重建
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作者单位: CAS Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China; Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, European Way, Southampton, United Kingdom; Scott Polar Research Institute, University of Cambridge, Cambridge, United Kingdom; Institute of Deep-Sea Science and Engineering, Chinese Academy of Sciences, Sanya, China; Dept Animal and Plant Sciences, University of Sheffield, Western Bank, Sheffield, United Kingdom
Recommended Citation:
Zhao F.,Minshull T.A.,Crocker A.J.,et al. Pleistocene iceberg dynamics on the west Svalbard margin: Evidence from bathymetric and sub-bottom profiler data[J]. Quaternary Science Reviews,2017-01-01,161