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Changes in ice-margin processes and sediment routing during ice-sheet advance across a marginal moraine

Geografiska Annaler, Series A: Physical Geography

By:
, , ,
DOI: 10.1111/j.1468-0459.2007.00319.x

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Abstract

Advance of part of the margin of the Greenland ice sheet across a proglacial moraine ridge between 1968 and 2002 caused progressive changes in moraine morphology, basal ice formation, debris release, ice-marginal sediment storage, and sediment transfer to the distal proglacial zone. When the ice margin is behind the moraine, most of the sediment released from the glacier is stored close to the ice margin. As the margin advances across the moraine the potential for ice-proximal sediment storage decreases and distal sediment flux is augmented by reactivation of moraine sediment. For six stages of advance associated with distinctive glacial and sedimentary processes we describe the ice margin, the debris-rich basal ice, debris release from the glacier, sediment routing into the proglacial zone, and geomorphic processes on the moraine. The overtopping of a moraine ridge is a significant glaciological, geomorphological and sedimentological threshold in glacier advance, likely to cause a distinctive pulse in distal sediment accumulation rates that should be taken into account when glacial sediments are interpreted to reconstruct glacier fluctuations. ?? 2007 Swedish Society for Anthropology and Geography.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Changes in ice-margin processes and sediment routing during ice-sheet advance across a marginal moraine
Series title:
Geografiska Annaler, Series A: Physical Geography
DOI:
10.1111/j.1468-0459.2007.00319.x
Volume
89
Issue:
3
Year Published:
2007
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geografiska Annaler, Series A: Physical Geography
First page:
203
Last page:
215
Number of Pages:
13