Drumlin formation within the Bustarfell drumlin field, northeast Iceland:integrating sedimentological and ground-penetrating radar data
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 pa...
Published in: | Oceanography |
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Language: | English |
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2023
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Online Access: | https://curis.ku.dk/portal/da/publications/drumlin-formation-within-the-bustarfell-drumlin-field-northeast-iceland(281e8989-5ada-427e-bbd9-fbc419f95ef8).html https://doi.org/10.1002/jqs.3481 |
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ftcopenhagenunip:oai:pure.atira.dk:publications/281e8989-5ada-427e-bbd9-fbc419f95ef8 2024-06-09T07:46:48+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 2023 https://curis.ku.dk/portal/da/publications/drumlin-formation-within-the-bustarfell-drumlin-field-northeast-iceland(281e8989-5ada-427e-bbd9-fbc419f95ef8).html https://doi.org/10.1002/jqs.3481 eng eng info:eu-repo/semantics/closedAccess Aradóttir , N , Benediktsson , Í Ö , Ingólfsson , Ó , Sturkell , E , Brynjólfsson , S , Farnsworth , W R & Phillips , E 2023 , ' Drumlin formation within the Bustarfell drumlin field, northeast Iceland : integrating sedimentological and ground-penetrating radar data ' , Journal of Quaternary Science , vol. 38 , no. 3 , pp. 386-402 . https://doi.org/10.1002/jqs.3481 Bustarfell drumlin ground-penetrating radar Iceland Ice Sheet subglacial processes article 2023 ftcopenhagenunip https://doi.org/10.1002/jqs.3481 2024-05-16T11:29:27Z 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 University of Copenhagen: Research 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) Oceanography 33 1 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
topic |
Bustarfell drumlin ground-penetrating radar Iceland Ice Sheet subglacial processes |
spellingShingle |
Bustarfell drumlin ground-penetrating radar Iceland Ice Sheet subglacial processes 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 |
topic_facet |
Bustarfell drumlin ground-penetrating radar Iceland Ice Sheet subglacial processes |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Aradóttir, Nína Benediktsson, Ívar Örn Ingólfsson, Ólafur Sturkell, Erik Brynjólfsson, Skafti Farnsworth, Wesley R. Phillips, Emrys |
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 |
publishDate |
2023 |
url |
https://curis.ku.dk/portal/da/publications/drumlin-formation-within-the-bustarfell-drumlin-field-northeast-iceland(281e8989-5ada-427e-bbd9-fbc419f95ef8).html https://doi.org/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 |
Aradóttir , N , Benediktsson , Í Ö , Ingólfsson , Ó , Sturkell , E , Brynjólfsson , S , Farnsworth , W R & Phillips , E 2023 , ' Drumlin formation within the Bustarfell drumlin field, northeast Iceland : integrating sedimentological and ground-penetrating radar data ' , Journal of Quaternary Science , vol. 38 , no. 3 , pp. 386-402 . https://doi.org/10.1002/jqs.3481 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1002/jqs.3481 |
container_title |
Oceanography |
container_volume |
33 |
container_issue |
1 |
_version_ |
1801376785861967872 |