Drumlin formation within the Bustarfell drumlin field, northeast Iceland: integrating sedimentological and ground‐penetrating radar data
ABSTRACT Drumlins are important bedforms of former glaciated landscapes as they demonstrate past ice‐flow directions and elucidate processes that operated at the ice/bed interface. Recently mapped drumlins and other streamlined subglacial bedforms in northeast Iceland reveal the flow‐sets of cross‐c...
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Online Access: | http://dx.doi.org/10.1002/jqs.3481 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3481 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/jqs.3481 |
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crwiley:10.1002/jqs.3481 2024-06-02T08:08:18+00:00 Drumlin formation within the Bustarfell drumlin field, northeast Iceland: integrating sedimentological and ground‐penetrating radar data Aradóttir, Nína Benediktsson, Ívar Örn Ingólfsson, Ólafur Sturkell, Erik Brynjólfsson, Skafti Farnsworth, Wesley R. Phillips, Emrys Háskóli Íslands Landsvirkjun 2022 http://dx.doi.org/10.1002/jqs.3481 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3481 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/jqs.3481 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Quaternary Science volume 38, issue 3, page 386-402 ISSN 0267-8179 1099-1417 journal-article 2022 crwiley https://doi.org/10.1002/jqs.3481 2024-05-03T11:49:54Z ABSTRACT Drumlins are important bedforms of former glaciated landscapes as they demonstrate past ice‐flow directions and elucidate processes that operated at the ice/bed interface. Recently mapped drumlins and other streamlined subglacial bedforms in northeast Iceland reveal the flow‐sets of cross‐cutting palaeo‐ice streams that were active within the Iceland Ice Sheet (IIS) during and following the Last Glacial Maximum. Here we study the Bustarfell drumlin field within the Vopnafjörður–Jökuldalsheiði flow‐set. The internal architecture of two drumlins was investigated using sedimentological analysis and ground‐penetrating radar (GPR, 50 and 100 MHz) to illuminate subglacial processes that contributed to drumlin formation, as well as the history and dynamics of the IIS. On the stoss side of one of the drumlins, two subglacial traction till units were identified, separated by a thick unit of deformed glaciofluvial sand and gravel. The core of glaciofluvial material suggests that the drumlin formed around well‐drained patches (sticky spots) in the subglacial bed that retarded the ice flow locally through increased basal drag and encouraged till deposition. Furthermore, our GPR data indicate a combination of erosional and depositional processes. We suggest that the glaciofluvial sediments were deposited as small ice‐marginal fans on the Bustarfell plateau, possibly during the Bølling–Allerød interstadial, and that the drumlins were formed around these fans during a subsequent readvance during the Younger Dryas. Article in Journal/Newspaper Ice Sheet Iceland Wiley Online Library Bustarfell ENVELOPE(-21.433,-21.433,65.917,65.917) Jökuldalsheiði ENVELOPE(-15.400,-15.400,65.283,65.283) Vopnafjörður ENVELOPE(-14.828,-14.828,65.757,65.757) Journal of Quaternary Science 38 3 386 402 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
ABSTRACT Drumlins are important bedforms of former glaciated landscapes as they demonstrate past ice‐flow directions and elucidate processes that operated at the ice/bed interface. Recently mapped drumlins and other streamlined subglacial bedforms in northeast Iceland reveal the flow‐sets of cross‐cutting palaeo‐ice streams that were active within the Iceland Ice Sheet (IIS) during and following the Last Glacial Maximum. Here we study the Bustarfell drumlin field within the Vopnafjörður–Jökuldalsheiði flow‐set. The internal architecture of two drumlins was investigated using sedimentological analysis and ground‐penetrating radar (GPR, 50 and 100 MHz) to illuminate subglacial processes that contributed to drumlin formation, as well as the history and dynamics of the IIS. On the stoss side of one of the drumlins, two subglacial traction till units were identified, separated by a thick unit of deformed glaciofluvial sand and gravel. The core of glaciofluvial material suggests that the drumlin formed around well‐drained patches (sticky spots) in the subglacial bed that retarded the ice flow locally through increased basal drag and encouraged till deposition. Furthermore, our GPR data indicate a combination of erosional and depositional processes. We suggest that the glaciofluvial sediments were deposited as small ice‐marginal fans on the Bustarfell plateau, possibly during the Bølling–Allerød interstadial, and that the drumlins were formed around these fans during a subsequent readvance during the Younger Dryas. |
author2 |
Háskóli Íslands Landsvirkjun |
format |
Article in Journal/Newspaper |
author |
Aradóttir, Nína Benediktsson, Ívar Örn Ingólfsson, Ólafur Sturkell, Erik Brynjólfsson, Skafti Farnsworth, Wesley R. Phillips, Emrys |
spellingShingle |
Aradóttir, Nína Benediktsson, Ívar Örn Ingólfsson, Ólafur Sturkell, Erik Brynjólfsson, Skafti Farnsworth, Wesley R. Phillips, Emrys Drumlin formation within the Bustarfell drumlin field, northeast Iceland: integrating sedimentological and ground‐penetrating radar data |
author_facet |
Aradóttir, Nína Benediktsson, Ívar Örn Ingólfsson, Ólafur Sturkell, Erik Brynjólfsson, Skafti Farnsworth, Wesley R. Phillips, Emrys |
author_sort |
Aradóttir, Nína |
title |
Drumlin formation within the Bustarfell drumlin field, northeast Iceland: integrating sedimentological and ground‐penetrating radar data |
title_short |
Drumlin formation within the Bustarfell drumlin field, northeast Iceland: integrating sedimentological and ground‐penetrating radar data |
title_full |
Drumlin formation within the Bustarfell drumlin field, northeast Iceland: integrating sedimentological and ground‐penetrating radar data |
title_fullStr |
Drumlin formation within the Bustarfell drumlin field, northeast Iceland: integrating sedimentological and ground‐penetrating radar data |
title_full_unstemmed |
Drumlin formation within the Bustarfell drumlin field, northeast Iceland: integrating sedimentological and ground‐penetrating radar data |
title_sort |
drumlin formation within the bustarfell drumlin field, northeast iceland: integrating sedimentological and ground‐penetrating radar data |
publisher |
Wiley |
publishDate |
2022 |
url |
http://dx.doi.org/10.1002/jqs.3481 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3481 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/jqs.3481 |
long_lat |
ENVELOPE(-21.433,-21.433,65.917,65.917) ENVELOPE(-15.400,-15.400,65.283,65.283) ENVELOPE(-14.828,-14.828,65.757,65.757) |
geographic |
Bustarfell Jökuldalsheiði Vopnafjörður |
geographic_facet |
Bustarfell Jökuldalsheiði Vopnafjörður |
genre |
Ice Sheet Iceland |
genre_facet |
Ice Sheet Iceland |
op_source |
Journal of Quaternary Science volume 38, issue 3, page 386-402 ISSN 0267-8179 1099-1417 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/jqs.3481 |
container_title |
Journal of Quaternary Science |
container_volume |
38 |
container_issue |
3 |
container_start_page |
386 |
op_container_end_page |
402 |
_version_ |
1800753519209218048 |