Marginal formation of De Geer moraines and their implications to the dynamics of grounding‐line recession
Abstract De Geer moraine ridges occur in abundance in the coastal zone of northern Sweden, preferentially in areas with proglacial water depths in excess of 150 m at deglaciation. From detailed sedimentological and structural investigations in machine‐dug trenches across De Geer ridges it is conclud...
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crwiley:10.1002/jqs.902 2024-09-30T14:40:18+00:00 Marginal formation of De Geer moraines and their implications to the dynamics of grounding‐line recession Lindén, Mattias Möller, Per 2005 http://dx.doi.org/10.1002/jqs.902 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.902 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.902 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Quaternary Science volume 20, issue 2, page 113-133 ISSN 0267-8179 1099-1417 journal-article 2005 crwiley https://doi.org/10.1002/jqs.902 2024-09-19T04:18:41Z Abstract De Geer moraine ridges occur in abundance in the coastal zone of northern Sweden, preferentially in areas with proglacial water depths in excess of 150 m at deglaciation. From detailed sedimentological and structural investigations in machine‐dug trenches across De Geer ridges it is concluded that the moraines formed due to subglacial sediment advection to the ice margin during temporary halts in grounding‐line retreat, forming gradually thickening sediment wedges. The proximal part of the moraines were built up in submarginal position as stacked sequences of deforming bed diamictons, intercalated with glaciofluvial canal‐infill sediments, whereas the distal parts were built up from the grounding line by prograding sediment gravity‐flow deposits, distally interfingering with glaciolacustrine sediments. The rapid grounding‐line retreat (ca. 400 m yr −1 ) was driven by rapid calving, in turn enhanced by fast iceflow and marginal thinning of ice due to deforming bed conditions. The spatial distribution of the moraine ridges indicates stepwise retreat of the grounding line. It is suggested that this is due to slab and flake calving of the ice cliff above the waterline, forming a gradually widening subaqueous ice ledge which eventually breaks off to a new grounding line, followed by regained sediment delivery and ridge build‐up. Copyright © 2005 John Wiley & Sons, Ltd. Article in Journal/Newspaper Northern Sweden Wiley Online Library Ice Ledge ENVELOPE(-55.298,-55.298,49.550,49.550) Journal of Quaternary Science 20 2 113 133 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract De Geer moraine ridges occur in abundance in the coastal zone of northern Sweden, preferentially in areas with proglacial water depths in excess of 150 m at deglaciation. From detailed sedimentological and structural investigations in machine‐dug trenches across De Geer ridges it is concluded that the moraines formed due to subglacial sediment advection to the ice margin during temporary halts in grounding‐line retreat, forming gradually thickening sediment wedges. The proximal part of the moraines were built up in submarginal position as stacked sequences of deforming bed diamictons, intercalated with glaciofluvial canal‐infill sediments, whereas the distal parts were built up from the grounding line by prograding sediment gravity‐flow deposits, distally interfingering with glaciolacustrine sediments. The rapid grounding‐line retreat (ca. 400 m yr −1 ) was driven by rapid calving, in turn enhanced by fast iceflow and marginal thinning of ice due to deforming bed conditions. The spatial distribution of the moraine ridges indicates stepwise retreat of the grounding line. It is suggested that this is due to slab and flake calving of the ice cliff above the waterline, forming a gradually widening subaqueous ice ledge which eventually breaks off to a new grounding line, followed by regained sediment delivery and ridge build‐up. Copyright © 2005 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Lindén, Mattias Möller, Per |
spellingShingle |
Lindén, Mattias Möller, Per Marginal formation of De Geer moraines and their implications to the dynamics of grounding‐line recession |
author_facet |
Lindén, Mattias Möller, Per |
author_sort |
Lindén, Mattias |
title |
Marginal formation of De Geer moraines and their implications to the dynamics of grounding‐line recession |
title_short |
Marginal formation of De Geer moraines and their implications to the dynamics of grounding‐line recession |
title_full |
Marginal formation of De Geer moraines and their implications to the dynamics of grounding‐line recession |
title_fullStr |
Marginal formation of De Geer moraines and their implications to the dynamics of grounding‐line recession |
title_full_unstemmed |
Marginal formation of De Geer moraines and their implications to the dynamics of grounding‐line recession |
title_sort |
marginal formation of de geer moraines and their implications to the dynamics of grounding‐line recession |
publisher |
Wiley |
publishDate |
2005 |
url |
http://dx.doi.org/10.1002/jqs.902 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.902 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.902 |
long_lat |
ENVELOPE(-55.298,-55.298,49.550,49.550) |
geographic |
Ice Ledge |
geographic_facet |
Ice Ledge |
genre |
Northern Sweden |
genre_facet |
Northern Sweden |
op_source |
Journal of Quaternary Science volume 20, issue 2, page 113-133 ISSN 0267-8179 1099-1417 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/jqs.902 |
container_title |
Journal of Quaternary Science |
container_volume |
20 |
container_issue |
2 |
container_start_page |
113 |
op_container_end_page |
133 |
_version_ |
1811642794679205888 |