Pleistocene iceberg dynamics on the west Svalbard margin: Evidence from bathymetric and sub-bottom profiler data

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	Pleistocene iceberg dynamics on the west Svalbard margin: Evidence from bathymetric and sub-bottom profiler data
	Zhao, F; Minshull, TA; Crocker, AJ; Dowdeswell, JA; Wu, SG; Soryal, SM; zhaofangiocas@gmail.com; tmin@noc.soton.ac.uk
刊名	QUATERNARY SCIENCE REVIEWS
	2017
卷号	161 页码:30-44
关键词	Icebergs Iceberg Ploughmarks Western Svalbard Margin West Spitsbergen Current Pleistocene
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.(C) 2017 Elsevier Ltd. All rights reserved.
资助项目	MSG
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/16483]
专题	南海海洋研究所_中科院边缘海地质重点实验室
通讯作者	zhaofangiocas@gmail.com; tmin@noc.soton.ac.uk
推荐引用方式 GB/T 7714	Zhao, F,Minshull, TA,Crocker, AJ,et al. Pleistocene iceberg dynamics on the west Svalbard margin: Evidence from bathymetric and sub-bottom profiler data[J]. QUATERNARY SCIENCE REVIEWS,2017,161:30-44.
APA	Zhao, F.,Minshull, TA.,Crocker, AJ.,Dowdeswell, JA.,Wu, SG.,...&tmin@noc.soton.ac.uk.(2017).Pleistocene iceberg dynamics on the west Svalbard margin: Evidence from bathymetric and sub-bottom profiler data.QUATERNARY SCIENCE REVIEWS,161,30-44.
MLA	Zhao, F,et al."Pleistocene iceberg dynamics on the west Svalbard margin: Evidence from bathymetric and sub-bottom profiler data".QUATERNARY SCIENCE REVIEWS 161(2017):30-44.