| DOI: | 10.1016/j.quascirev.2013.02.013
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| Scopus记录号: | 2-s2.0-84875279484
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| 论文题名: | The marine-based NW Fennoscandian ice sheet: Glacial and deglacial dynamics as reconstructed from submarine landforms |
| 作者: | Rydningen T.A.; Vorren T.O.; Laberg J.S.; Kolstad V.
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| 刊名: | Quaternary Science Reviews
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| ISSN: | 2773791
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| 出版年: | 2013
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| 卷: | 68 | | 起始页码: | 126
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| 结束页码: | 141
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| 语种: | 英语
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| 英文关键词: | Deglaciation dynamics
; Ice streams
; Last Glacial Maximum
; Mega-scale glacial lineations
; Shear zone moraines
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| Scopus关键词: | Deglaciations
; Glacial lineation
; Ice streams
; Last Glacial Maximum
; Shear zone
; Dynamics
; Glacial geology
; Glaciers
; Ice
; continental shelf
; deglaciation
; dome
; episodic event
; glacier retreat
; ice sheet
; Last Glacial Maximum
; moraine
; reconstruction
; sea ice
; seismic data
; shear zone
; swath bathymetry
; Fennoscandia
; Norway
; Troms
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| 英文摘要: | The configuration of the marine-based NW Fennoscandian ice sheet during the Last Glacial Maximum (LGM) and deglaciation is reconstructed using detailed swath bathymetry and high-resolution seismic data. The investigated area covers about 10,000 km2 of the continental shelf off Troms, northern Norway. Large scale morphology is characterized by cross-shelf troughs, coast-parallel troughs and banks. Based on mega-scale glacial lineations (MSGL), lateral and shear zone moraines and grounding zone systems, the extent and dynamics of the ice sheet during the LGM are deduced. MSGL indicate fast-flowing ice streams in the cross-shelf troughs, while the glacial morphology on the banks indicates more sluggish ice here. The marine-based part of the Fennoscandian ice sheet was sourced from ice domes in the east via fjord and valley systems inshore. Using a balance flux approach, we estimate palaeo-ice stream velocities during the LGM to be approximately 350 m/year. Three deglaciation events have been reconstructed: i) During the Torsken-1 event the ice sheet halted or readvanced to form groundings zone wedges (GZW) and the Torsken moraine, ii) Several still-stands or readvances characterized the ice behaviour on the shallower banks during the Torsken-2 event, iii) During the Flesen event, prominent end moraines in the inner parts of the troughs and banks were deposited. The locations of the end moraines and GZW in the troughs indicate that the retreat of marine-based ice streams in areas of reverse bed slope was episodic, probably mainly due to the variation in widths of the cross-shelf troughs. © 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/60663
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| Appears in Collections: | 过去全球变化的重建
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作者单位: | Department of Geology, University of Tromsø, N-9037 Tromsø, Norway; DONG Energy E and P Norge AS, Roald Amundsens Plass 1, N-9257 Tromsø, Norway
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| Recommended Citation: | |
Rydningen T.A.,Vorren T.O.,Laberg J.S.,et al. The marine-based NW Fennoscandian ice sheet: Glacial and deglacial dynamics as reconstructed from submarine landforms[J]. Quaternary Science Reviews,2013-01-01,68
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