globalchange  > 气候变化事实与影响
DOI: 10.1016/j.geomorph.2019.01.007
WOS记录号: WOS:000461407500004
论文题名:
Glacial to postglacial submarine landform assemblages in fiords of northeastern Baffin Island
作者: Brouard, Etienne; Lajeunesse, Patrick
通讯作者: Brouard, Etienne
刊名: GEOMORPHOLOGY
ISSN: 0169-555X
EISSN: 1872-695X
出版年: 2019
卷: 330, 页码:40-56
语种: 英语
英文关键词: Fiords ; Arctic Canada ; Laurentide Ice Sheet dynamics ; Glacial geomorphology
WOS关键词: GROUNDING-ZONE WEDGES ; ANTARCTIC ICE-SHEET ; SEA-LEVEL RISE ; HOLOCENE GLACIATION ; RECONCILED ESTIMATE ; LAST DEGLACIATION ; CONTINENTAL-SHELF ; FLOW DYNAMICS ; ARCTIC CANADA ; AXIAL CHANNEL
WOS学科分类: Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向: Physical Geography ; Geology
英文摘要:

Fiord morphology plays a fundamental role in glacier flow dynamics and on ice-margin stability. As most of the present-day margins of the Greenland Ice Sheet lays in fiords, there is a need for understanding short- and long-term glacial dynamics in fiord settings. We investigate ice-sheet retreat patterns in previously glaciated submarine terrain of northeastern Baffin Island fiords to provide analogues for modern and future ice-sheet response to climate change and sea-level rise. Geomorphological maps constructed from the interpretation of swath bathymetry imagery in fiords of northeastern Baffin Island reveal a wide range of glacial to postglacial landforms that allow the reconstruction of past ice-sheet retreat dynamics. Ice-flow landforms such as mega-scale glacial lineations, crag-and-tails, and meltwater channels reveal the direction and behaviour of late-Foxe ice flow through the fiords. The presence of undisturbed elongated landforms within the fiords suggests that ice streams have probably been active until the late stage of deglaciation. Landforms transverse to ice-flow direction include grounding-zone wedges, frontal moraines, grounding-line fans, recessional moraines and De Geer moraines. These landforms are interpreted as the result of former standstills of the ice margin during deglaciation. The occurrence of grounding zones in deep (>800 m) part of the fiords contrasts with studies suggesting instability and rapid retreat of outlet glaciers over deep fiord basins. Sediment-filled basins, often characterised by the presence of turbidity channels, gullies and mass movement scars occur in-between the moraines. Sediment-filled basins with a ponded architecture between sills illustrate that most of the sediment accumulation was ice-proximal during deglaciation and characterised by gravity-driven flows. The proposed landform-assemblage model for northeastern Baffin fiords includes landforms typical of different fiord landsystems. (C) 2019 Elsevier B.V. All rights reserved.


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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/133650
Appears in Collections:气候变化事实与影响

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作者单位: Univ Laval, Ctr Etud Nord, Dept Geog, Quebec City, PQ, Canada

Recommended Citation:
Brouard, Etienne,Lajeunesse, Patrick. Glacial to postglacial submarine landform assemblages in fiords of northeastern Baffin Island[J]. GEOMORPHOLOGY,2019-01-01,330:40-56
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