Be-10-based exploration of the timing of deglaciation in two selected areas of southern Norway
We present new Be-10 surface exposure ages from two selected locations in southern Norway. A total of five Be-10 samples allow a first assessment of local deglaciation dynamics of the Scandinavian Ice Sheet at Dalsnibba (1476 ma.s.l.) in southwestern Norway. The bedrock ages from the summit of Dalsn...
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ftubkoeln:oai:USBKOELN.ub.uni-koeln.de:13451 2023-05-15T16:41:18+02:00 Be-10-based exploration of the timing of deglaciation in two selected areas of southern Norway Marr, Philipp Winkler, Stefan Binnie, Steven A. Loeffler, Joerg 2019 https://kups.ub.uni-koeln.de/13451/ eng eng COPERNICUS GESELLSCHAFT MBH Marr, Philipp orcid:0000-0002-8037-1017 , Winkler, Stefan, Binnie, Steven A. and Loeffler, Joerg (2019). Be-10-based exploration of the timing of deglaciation in two selected areas of southern Norway. E G Quatern. Sci. J., 68 (2). S. 165 - 177. GOTTINGEN: COPERNICUS GESELLSCHAFT MBH. ISSN 2199-9090 ddc:no doc-type:article publishedVersion 2019 ftubkoeln 2022-11-09T07:14:02Z We present new Be-10 surface exposure ages from two selected locations in southern Norway. A total of five Be-10 samples allow a first assessment of local deglaciation dynamics of the Scandinavian Ice Sheet at Dalsnibba (1476 ma.s.l.) in southwestern Norway. The bedrock ages from the summit of Dalsnibba range from 13.3 +/- 0.6 to 12.7 +/- 0.5 ka and probably indicate the onset of deglaciation as a glacially transported boulder age (16.5 +/- 0.6 ka) from the same elevation likely shows inheritance. These ages indicate initial deglaciation commencing at the end of the Bolling-Allerod interstadial (similar to 14.7-12.9 kyr BP) and ice-free conditions at Dalsnibba's summit during the Younger Dryas. Bedrock samples at lower elevations imply vertical ice surface lowering down to 1334 ma.s.l. at 10.3 +/- 0.5 ka and a longer overall period of downwasting than previously assumed. Two further Be-10 samples add to the existing chronology at Blaho (1617 ma.s.l.) in south-central Norway. The Be-10 erratic boulder sample on the summit of Blaho sample yields 20.9 +/- 0.8 ka, whereas a Be-10 age of 46.4 +/- 1.7 ka for exposed summit bedrock predates the Late Weichselian Maximum. This anomalously old bedrock age infers inherited cosmogenic nuclide concentrations and suggests low erosive cold-based ice cover during the Last Glacial Maximum. However, due to possible effects of cryoturbation and frost heave processes affecting the erratic boulder age and insufficient numbers of Be-10 samples, the glaciation history on Blaho cannot conclusively be resolved. Comparing the different timing of deglaciation at both locations in a rather short west-east distance demonstrates the complex dynamics of deglaciation in relation to other areas in southern Norway. Article in Journal/Newspaper Ice Sheet Cologne University: KUPS Norway |
institution |
Open Polar |
collection |
Cologne University: KUPS |
op_collection_id |
ftubkoeln |
language |
English |
topic |
ddc:no |
spellingShingle |
ddc:no Marr, Philipp Winkler, Stefan Binnie, Steven A. Loeffler, Joerg Be-10-based exploration of the timing of deglaciation in two selected areas of southern Norway |
topic_facet |
ddc:no |
description |
We present new Be-10 surface exposure ages from two selected locations in southern Norway. A total of five Be-10 samples allow a first assessment of local deglaciation dynamics of the Scandinavian Ice Sheet at Dalsnibba (1476 ma.s.l.) in southwestern Norway. The bedrock ages from the summit of Dalsnibba range from 13.3 +/- 0.6 to 12.7 +/- 0.5 ka and probably indicate the onset of deglaciation as a glacially transported boulder age (16.5 +/- 0.6 ka) from the same elevation likely shows inheritance. These ages indicate initial deglaciation commencing at the end of the Bolling-Allerod interstadial (similar to 14.7-12.9 kyr BP) and ice-free conditions at Dalsnibba's summit during the Younger Dryas. Bedrock samples at lower elevations imply vertical ice surface lowering down to 1334 ma.s.l. at 10.3 +/- 0.5 ka and a longer overall period of downwasting than previously assumed. Two further Be-10 samples add to the existing chronology at Blaho (1617 ma.s.l.) in south-central Norway. The Be-10 erratic boulder sample on the summit of Blaho sample yields 20.9 +/- 0.8 ka, whereas a Be-10 age of 46.4 +/- 1.7 ka for exposed summit bedrock predates the Late Weichselian Maximum. This anomalously old bedrock age infers inherited cosmogenic nuclide concentrations and suggests low erosive cold-based ice cover during the Last Glacial Maximum. However, due to possible effects of cryoturbation and frost heave processes affecting the erratic boulder age and insufficient numbers of Be-10 samples, the glaciation history on Blaho cannot conclusively be resolved. Comparing the different timing of deglaciation at both locations in a rather short west-east distance demonstrates the complex dynamics of deglaciation in relation to other areas in southern Norway. |
format |
Article in Journal/Newspaper |
author |
Marr, Philipp Winkler, Stefan Binnie, Steven A. Loeffler, Joerg |
author_facet |
Marr, Philipp Winkler, Stefan Binnie, Steven A. Loeffler, Joerg |
author_sort |
Marr, Philipp |
title |
Be-10-based exploration of the timing of deglaciation in two selected areas of southern Norway |
title_short |
Be-10-based exploration of the timing of deglaciation in two selected areas of southern Norway |
title_full |
Be-10-based exploration of the timing of deglaciation in two selected areas of southern Norway |
title_fullStr |
Be-10-based exploration of the timing of deglaciation in two selected areas of southern Norway |
title_full_unstemmed |
Be-10-based exploration of the timing of deglaciation in two selected areas of southern Norway |
title_sort |
be-10-based exploration of the timing of deglaciation in two selected areas of southern norway |
publisher |
COPERNICUS GESELLSCHAFT MBH |
publishDate |
2019 |
url |
https://kups.ub.uni-koeln.de/13451/ |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
Marr, Philipp orcid:0000-0002-8037-1017 , Winkler, Stefan, Binnie, Steven A. and Loeffler, Joerg (2019). Be-10-based exploration of the timing of deglaciation in two selected areas of southern Norway. E G Quatern. Sci. J., 68 (2). S. 165 - 177. GOTTINGEN: COPERNICUS GESELLSCHAFT MBH. ISSN 2199-9090 |
_version_ |
1766031736208097280 |