Imaging glacial sediment inclusions in 3‐D using ground‐penetrating radar at Kongsvegen, Svalbard
Abstract The quiescent‐phase surge‐type glacier, Kongsvegen, flows confluent with the continuously fast‐flowing Kronebreen in northwestern Spitsbergen. The lower regions of Kongsvegen overlie glaciomarine sediments, which have been incorporated into the ice during multiple surge events. The resultin...
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crwiley:10.1002/jqs.1351 2024-06-02T08:07:07+00:00 Imaging glacial sediment inclusions in 3‐D using ground‐penetrating radar at Kongsvegen, Svalbard Murray, Tavi Booth, Adam D. 2009 http://dx.doi.org/10.1002/jqs.1351 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.1351 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.1351 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Quaternary Science volume 25, issue 5, page 754-761 ISSN 0267-8179 1099-1417 journal-article 2009 crwiley https://doi.org/10.1002/jqs.1351 2024-05-03T10:53:31Z Abstract The quiescent‐phase surge‐type glacier, Kongsvegen, flows confluent with the continuously fast‐flowing Kronebreen in northwestern Spitsbergen. The lower regions of Kongsvegen overlie glaciomarine sediments, which have been incorporated into the ice during multiple surge events. The resulting englacial structures are exposed at the surface and on a cliff section. These structures have variously been interpreted as thrusts, formed by compression, or sediment‐filled crevasses, formed by extension. We collected a grid of closely spaced ground‐penetrating radar profiles in the area adjacent to the cliff section. Several structures were imaged in 3‐D, including a strong subhorizontal basal reflector, which was underlain by a second, weaker subhorizontal reflector. The basal reflector was occasionally reverse faulted, suggesting compression. Clear englacial features extended upwards from it, dipping up‐glacier at angles of <40° and steepening towards the glacier surface; they had complex geometries that changed rapidly cross‐glacier. The structures were orientated at ∼30° to ice flow, suggesting modification by lateral compression from Kronebreen. Some of these englacial structures clearly crossed the basal reflector. We conclude that the englacial features imaged are not likely to be derived from crevasse filling and were probably formed by thrusting. The results contribute to our understanding of surge initiation and termination processes, and interpretation of features in the palaeorecord. Copyright © 2009 John Wiley & Sons, Ltd. Article in Journal/Newspaper glacier Svalbard Spitsbergen Wiley Online Library Svalbard Kronebreen ENVELOPE(13.333,13.333,78.833,78.833) Kongsvegen ENVELOPE(12.657,12.657,78.854,78.854) Journal of Quaternary Science 25 5 754 761 |
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Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract The quiescent‐phase surge‐type glacier, Kongsvegen, flows confluent with the continuously fast‐flowing Kronebreen in northwestern Spitsbergen. The lower regions of Kongsvegen overlie glaciomarine sediments, which have been incorporated into the ice during multiple surge events. The resulting englacial structures are exposed at the surface and on a cliff section. These structures have variously been interpreted as thrusts, formed by compression, or sediment‐filled crevasses, formed by extension. We collected a grid of closely spaced ground‐penetrating radar profiles in the area adjacent to the cliff section. Several structures were imaged in 3‐D, including a strong subhorizontal basal reflector, which was underlain by a second, weaker subhorizontal reflector. The basal reflector was occasionally reverse faulted, suggesting compression. Clear englacial features extended upwards from it, dipping up‐glacier at angles of <40° and steepening towards the glacier surface; they had complex geometries that changed rapidly cross‐glacier. The structures were orientated at ∼30° to ice flow, suggesting modification by lateral compression from Kronebreen. Some of these englacial structures clearly crossed the basal reflector. We conclude that the englacial features imaged are not likely to be derived from crevasse filling and were probably formed by thrusting. The results contribute to our understanding of surge initiation and termination processes, and interpretation of features in the palaeorecord. Copyright © 2009 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Murray, Tavi Booth, Adam D. |
spellingShingle |
Murray, Tavi Booth, Adam D. Imaging glacial sediment inclusions in 3‐D using ground‐penetrating radar at Kongsvegen, Svalbard |
author_facet |
Murray, Tavi Booth, Adam D. |
author_sort |
Murray, Tavi |
title |
Imaging glacial sediment inclusions in 3‐D using ground‐penetrating radar at Kongsvegen, Svalbard |
title_short |
Imaging glacial sediment inclusions in 3‐D using ground‐penetrating radar at Kongsvegen, Svalbard |
title_full |
Imaging glacial sediment inclusions in 3‐D using ground‐penetrating radar at Kongsvegen, Svalbard |
title_fullStr |
Imaging glacial sediment inclusions in 3‐D using ground‐penetrating radar at Kongsvegen, Svalbard |
title_full_unstemmed |
Imaging glacial sediment inclusions in 3‐D using ground‐penetrating radar at Kongsvegen, Svalbard |
title_sort |
imaging glacial sediment inclusions in 3‐d using ground‐penetrating radar at kongsvegen, svalbard |
publisher |
Wiley |
publishDate |
2009 |
url |
http://dx.doi.org/10.1002/jqs.1351 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.1351 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.1351 |
long_lat |
ENVELOPE(13.333,13.333,78.833,78.833) ENVELOPE(12.657,12.657,78.854,78.854) |
geographic |
Svalbard Kronebreen Kongsvegen |
geographic_facet |
Svalbard Kronebreen Kongsvegen |
genre |
glacier Svalbard Spitsbergen |
genre_facet |
glacier Svalbard Spitsbergen |
op_source |
Journal of Quaternary Science volume 25, issue 5, page 754-761 ISSN 0267-8179 1099-1417 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/jqs.1351 |
container_title |
Journal of Quaternary Science |
container_volume |
25 |
container_issue |
5 |
container_start_page |
754 |
op_container_end_page |
761 |
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1800752130650275840 |