Progressive formation of modern drumlins at Múlajökull, Iceland: stratigraphical and morphological evidence
The drumlin field at Múlajökull, Iceland, is considered to be an active field in that partly and fully ice‐covered drumlins are being shaped by the current glacier regime. We test the hypothesis that the drumlins form by a combination of erosion and deposition during successive surge cycles. We mapp...
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Online Access: | http://dx.doi.org/10.1111/bor.12195 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fbor.12195 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bor.12195 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/bor.12195 https://onlinelibrary.wiley.com/doi/am-pdf/10.1111/bor.12195 |
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crwiley:10.1111/bor.12195 2024-09-09T19:41:28+00:00 Progressive formation of modern drumlins at Múlajökull, Iceland: stratigraphical and morphological evidence Benediktsson, Ívar Örn Jónsson, Sverrir A. Schomacker, Anders Johnson, Mark D. Ingólfsson, Ólafur Zoet, Lucas Iverson, Neal R. Stötter, Johann Icelandic Centre for Research National Science Foundation Háskóli Íslands Carlsbergfondet Kungliga Fysiografiska Sällskapet i Lund 2016 http://dx.doi.org/10.1111/bor.12195 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fbor.12195 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bor.12195 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/bor.12195 https://onlinelibrary.wiley.com/doi/am-pdf/10.1111/bor.12195 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor Boreas volume 45, issue 4, page 567-583 ISSN 0300-9483 1502-3885 journal-article 2016 crwiley https://doi.org/10.1111/bor.12195 2024-06-18T04:15:23Z The drumlin field at Múlajökull, Iceland, is considered to be an active field in that partly and fully ice‐covered drumlins are being shaped by the current glacier regime. We test the hypothesis that the drumlins form by a combination of erosion and deposition during successive surge cycles. We mapped and measured 143 drumlins and studied their stratigraphy in four exposures. All exposures reveal several till units where the youngest till commonly truncates older tills on the drumlin flanks and proximal slope. Drumlins inside a 1992 moraine are relatively long and narrow whereas drumlins outside the moraine are wider and shorter. A conceptual model suggests that radial crevasses create spatial heterogeneity in normal stress on the bed so that deposition is favoured beneath crevasses and erosion in adjacent areas. Consequently, the crevasse pattern of the glacier controls the location of proto‐drumlins. A feedback mechanism leads to continued crevassing and increased sedimentation at the location of the proto‐drumlins. The drumlin relief and elongation ratio increases as the glacier erodes the sides and drapes a new till over the landform through successive surges. Our observations of this only known active drumlin field may have implications for the formation and morphological evolution of Pleistocene drumlin fields with similar composition, and our model may be tested on modern drumlins that may become exposed upon future ice retreat. Article in Journal/Newspaper glacier Iceland Wiley Online Library Boreas 45 4 567 583 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
The drumlin field at Múlajökull, Iceland, is considered to be an active field in that partly and fully ice‐covered drumlins are being shaped by the current glacier regime. We test the hypothesis that the drumlins form by a combination of erosion and deposition during successive surge cycles. We mapped and measured 143 drumlins and studied their stratigraphy in four exposures. All exposures reveal several till units where the youngest till commonly truncates older tills on the drumlin flanks and proximal slope. Drumlins inside a 1992 moraine are relatively long and narrow whereas drumlins outside the moraine are wider and shorter. A conceptual model suggests that radial crevasses create spatial heterogeneity in normal stress on the bed so that deposition is favoured beneath crevasses and erosion in adjacent areas. Consequently, the crevasse pattern of the glacier controls the location of proto‐drumlins. A feedback mechanism leads to continued crevassing and increased sedimentation at the location of the proto‐drumlins. The drumlin relief and elongation ratio increases as the glacier erodes the sides and drapes a new till over the landform through successive surges. Our observations of this only known active drumlin field may have implications for the formation and morphological evolution of Pleistocene drumlin fields with similar composition, and our model may be tested on modern drumlins that may become exposed upon future ice retreat. |
author2 |
Icelandic Centre for Research National Science Foundation Háskóli Íslands Carlsbergfondet Kungliga Fysiografiska Sällskapet i Lund |
format |
Article in Journal/Newspaper |
author |
Benediktsson, Ívar Örn Jónsson, Sverrir A. Schomacker, Anders Johnson, Mark D. Ingólfsson, Ólafur Zoet, Lucas Iverson, Neal R. Stötter, Johann |
spellingShingle |
Benediktsson, Ívar Örn Jónsson, Sverrir A. Schomacker, Anders Johnson, Mark D. Ingólfsson, Ólafur Zoet, Lucas Iverson, Neal R. Stötter, Johann Progressive formation of modern drumlins at Múlajökull, Iceland: stratigraphical and morphological evidence |
author_facet |
Benediktsson, Ívar Örn Jónsson, Sverrir A. Schomacker, Anders Johnson, Mark D. Ingólfsson, Ólafur Zoet, Lucas Iverson, Neal R. Stötter, Johann |
author_sort |
Benediktsson, Ívar Örn |
title |
Progressive formation of modern drumlins at Múlajökull, Iceland: stratigraphical and morphological evidence |
title_short |
Progressive formation of modern drumlins at Múlajökull, Iceland: stratigraphical and morphological evidence |
title_full |
Progressive formation of modern drumlins at Múlajökull, Iceland: stratigraphical and morphological evidence |
title_fullStr |
Progressive formation of modern drumlins at Múlajökull, Iceland: stratigraphical and morphological evidence |
title_full_unstemmed |
Progressive formation of modern drumlins at Múlajökull, Iceland: stratigraphical and morphological evidence |
title_sort |
progressive formation of modern drumlins at múlajökull, iceland: stratigraphical and morphological evidence |
publisher |
Wiley |
publishDate |
2016 |
url |
http://dx.doi.org/10.1111/bor.12195 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fbor.12195 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bor.12195 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/bor.12195 https://onlinelibrary.wiley.com/doi/am-pdf/10.1111/bor.12195 |
genre |
glacier Iceland |
genre_facet |
glacier Iceland |
op_source |
Boreas volume 45, issue 4, page 567-583 ISSN 0300-9483 1502-3885 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/bor.12195 |
container_title |
Boreas |
container_volume |
45 |
container_issue |
4 |
container_start_page |
567 |
op_container_end_page |
583 |
_version_ |
1809910860679741440 |