Rapid tunnel-valley formation beneath the receding Late Weichselian ice sheet in Vendsyssel, Denmark
Interpretation of Transient ElectroMagnetic (TEM) data and wire-line logs has led to the delineation of an intricate pattern of buried tunnel valleys, along with new evidence of glaciotectonically dislocated layers in recessional moraines in the central part of Vendsyssel, Denmark. The TEM data have...
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ftulundlup:oai:lup.lub.lu.se:23506fe3-b8bf-471f-aeb1-84d71a2f9f9a 2023-05-15T16:40:26+02:00 Rapid tunnel-valley formation beneath the receding Late Weichselian ice sheet in Vendsyssel, Denmark Sandersen, Peter B. E. Jorgensen, Flemming Larsen, Nicolaj Krog Westergaard, Joakim H. Auken, Esben 2009 https://lup.lub.lu.se/record/1507580 https://doi.org/10.1111/j.1502-3885.2009.00105.x eng eng John Wiley & Sons Inc. https://lup.lub.lu.se/record/1507580 http://dx.doi.org/10.1111/j.1502-3885.2009.00105.x wos:000270642100012 scopus:73849127497 Boreas; 38(4), pp 834-851 (2009) ISSN: 1502-3885 Geology contributiontojournal/article info:eu-repo/semantics/article text 2009 ftulundlup https://doi.org/10.1111/j.1502-3885.2009.00105.x 2023-02-01T23:32:35Z Interpretation of Transient ElectroMagnetic (TEM) data and wire-line logs has led to the delineation of an intricate pattern of buried tunnel valleys, along with new evidence of glaciotectonically dislocated layers in recessional moraines in the central part of Vendsyssel, Denmark. The TEM data have been compared with recent results of stratigraphical investigations based on lithological and biostratigraphical analyses of borehole samples and dating with Optically Stimulated Luminescence (OSL) and radiocarbon. This has provided an overview of the spatial distribution of the late Quaternary lithostratigraphical formations, and the age of the tunnel valleys has been estimated. The tunnel valleys are typically 5-10 km long, 1 km wide and are locally eroded to depths of more than 180 m b.s.l. The valleys are interpreted to have been formed by subglacial meltwater erosion beneath the outermost part of the ice sheet during temporary standstills and minor re-advances during the overall Late Weichselian recession of the Scandinavian Ice Sheet. The formation of the tunnel valleys occurred after the retreat of the Main ice advance c. 20 kyr BP and before the Lateglacial marine inundation c. 18 kyr BP. Based on the occurrence of the tunnel valleys and the topography, four ice-marginal positions related to the recession of the northeastern Main advance and seven ice-marginal positions related to the recession from the following eastern re-advance across Vendsyssel are delineated. All the tunnel valleys were formed within a time interval of a few thousand years, giving only a few hundred years or less for the formation of the tunnel valleys at each ice-marginal position. Article in Journal/Newspaper Ice Sheet Lund University Publications (LUP) Boreas 38 4 834 851 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Geology |
spellingShingle |
Geology Sandersen, Peter B. E. Jorgensen, Flemming Larsen, Nicolaj Krog Westergaard, Joakim H. Auken, Esben Rapid tunnel-valley formation beneath the receding Late Weichselian ice sheet in Vendsyssel, Denmark |
topic_facet |
Geology |
description |
Interpretation of Transient ElectroMagnetic (TEM) data and wire-line logs has led to the delineation of an intricate pattern of buried tunnel valleys, along with new evidence of glaciotectonically dislocated layers in recessional moraines in the central part of Vendsyssel, Denmark. The TEM data have been compared with recent results of stratigraphical investigations based on lithological and biostratigraphical analyses of borehole samples and dating with Optically Stimulated Luminescence (OSL) and radiocarbon. This has provided an overview of the spatial distribution of the late Quaternary lithostratigraphical formations, and the age of the tunnel valleys has been estimated. The tunnel valleys are typically 5-10 km long, 1 km wide and are locally eroded to depths of more than 180 m b.s.l. The valleys are interpreted to have been formed by subglacial meltwater erosion beneath the outermost part of the ice sheet during temporary standstills and minor re-advances during the overall Late Weichselian recession of the Scandinavian Ice Sheet. The formation of the tunnel valleys occurred after the retreat of the Main ice advance c. 20 kyr BP and before the Lateglacial marine inundation c. 18 kyr BP. Based on the occurrence of the tunnel valleys and the topography, four ice-marginal positions related to the recession of the northeastern Main advance and seven ice-marginal positions related to the recession from the following eastern re-advance across Vendsyssel are delineated. All the tunnel valleys were formed within a time interval of a few thousand years, giving only a few hundred years or less for the formation of the tunnel valleys at each ice-marginal position. |
format |
Article in Journal/Newspaper |
author |
Sandersen, Peter B. E. Jorgensen, Flemming Larsen, Nicolaj Krog Westergaard, Joakim H. Auken, Esben |
author_facet |
Sandersen, Peter B. E. Jorgensen, Flemming Larsen, Nicolaj Krog Westergaard, Joakim H. Auken, Esben |
author_sort |
Sandersen, Peter B. E. |
title |
Rapid tunnel-valley formation beneath the receding Late Weichselian ice sheet in Vendsyssel, Denmark |
title_short |
Rapid tunnel-valley formation beneath the receding Late Weichselian ice sheet in Vendsyssel, Denmark |
title_full |
Rapid tunnel-valley formation beneath the receding Late Weichselian ice sheet in Vendsyssel, Denmark |
title_fullStr |
Rapid tunnel-valley formation beneath the receding Late Weichselian ice sheet in Vendsyssel, Denmark |
title_full_unstemmed |
Rapid tunnel-valley formation beneath the receding Late Weichselian ice sheet in Vendsyssel, Denmark |
title_sort |
rapid tunnel-valley formation beneath the receding late weichselian ice sheet in vendsyssel, denmark |
publisher |
John Wiley & Sons Inc. |
publishDate |
2009 |
url |
https://lup.lub.lu.se/record/1507580 https://doi.org/10.1111/j.1502-3885.2009.00105.x |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Boreas; 38(4), pp 834-851 (2009) ISSN: 1502-3885 |
op_relation |
https://lup.lub.lu.se/record/1507580 http://dx.doi.org/10.1111/j.1502-3885.2009.00105.x wos:000270642100012 scopus:73849127497 |
op_doi |
https://doi.org/10.1111/j.1502-3885.2009.00105.x |
container_title |
Boreas |
container_volume |
38 |
container_issue |
4 |
container_start_page |
834 |
op_container_end_page |
851 |
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1766030840328880128 |