Glacier variations in Breheimen, southern Norway: relative-age dating of Holocene moraine complexes at six high-altitude glaciers
Lichenometric evidence and Schmidt hammer R-values are used to date Holocene moraine sequences in front of six high-altitude (> 1500 m) glaciers in Breheimen, central southern Norway. At three glacier forelands with southerly aspects (Høgsetbreen, Vestre Høybre and Østre Høybre), relatively small...
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Online Access: | http://dx.doi.org/10.1191/0959683603hl766rp http://journals.sagepub.com/doi/pdf/10.1191/0959683603hl766rp |
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crsagepubl:10.1191/0959683603hl766rp 2024-09-15T18:07:52+00:00 Glacier variations in Breheimen, southern Norway: relative-age dating of Holocene moraine complexes at six high-altitude glaciers Shakesby, Richard A. Matthews, John A. Winkler, Stefan 2004 http://dx.doi.org/10.1191/0959683603hl766rp http://journals.sagepub.com/doi/pdf/10.1191/0959683603hl766rp en eng SAGE Publications http://journals.sagepub.com/page/policies/text-and-data-mining-license The Holocene volume 14, issue 6, page 899-910 ISSN 0959-6836 1477-0911 journal-article 2004 crsagepubl https://doi.org/10.1191/0959683603hl766rp 2024-08-19T04:28:19Z Lichenometric evidence and Schmidt hammer R-values are used to date Holocene moraine sequences in front of six high-altitude (> 1500 m) glaciers in Breheimen, central southern Norway. At three glacier forelands with southerly aspects (Høgsetbreen, Vestre Høybre and Østre Høybre), relatively small (≤4 m high) discrete boulder moraine ridges are shown to date from the ‘Little Ice Age’. The remaining three glaciers (Østre Tundradalskyrkjabre, Nordre Tundradalskyrkjabre and Hestdalshøgdibreen), with northerly or easterly aspects and large, multiridged, rampart-like moraine complexes (15-30m), thought to be ice-cored and of the ‘push-deformation’ type, lie above the local altitudinal limit of permafrost. Negatively skewed R-value distributions from these moraine complexes provide critical evidence for pre-‘Little Ice Age’ glacier expansion as they indicate the survival of long-weathered boulders on moraine surfaces where late-lying snow may reduce or prevent lichen growth. Formation of the moraine complexes appears to have begun in Preboreal times, most likely during the Erdalen Event, but much of their present character was determined by repeated Neoglacial glacier expansion, moraine deformation and ridge formation in the late Holocene, culminating in the ‘Little Ice Age’ readvance. Article in Journal/Newspaper glacier Ice permafrost SAGE Publications The Holocene 14 6 899 910 |
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English |
description |
Lichenometric evidence and Schmidt hammer R-values are used to date Holocene moraine sequences in front of six high-altitude (> 1500 m) glaciers in Breheimen, central southern Norway. At three glacier forelands with southerly aspects (Høgsetbreen, Vestre Høybre and Østre Høybre), relatively small (≤4 m high) discrete boulder moraine ridges are shown to date from the ‘Little Ice Age’. The remaining three glaciers (Østre Tundradalskyrkjabre, Nordre Tundradalskyrkjabre and Hestdalshøgdibreen), with northerly or easterly aspects and large, multiridged, rampart-like moraine complexes (15-30m), thought to be ice-cored and of the ‘push-deformation’ type, lie above the local altitudinal limit of permafrost. Negatively skewed R-value distributions from these moraine complexes provide critical evidence for pre-‘Little Ice Age’ glacier expansion as they indicate the survival of long-weathered boulders on moraine surfaces where late-lying snow may reduce or prevent lichen growth. Formation of the moraine complexes appears to have begun in Preboreal times, most likely during the Erdalen Event, but much of their present character was determined by repeated Neoglacial glacier expansion, moraine deformation and ridge formation in the late Holocene, culminating in the ‘Little Ice Age’ readvance. |
format |
Article in Journal/Newspaper |
author |
Shakesby, Richard A. Matthews, John A. Winkler, Stefan |
spellingShingle |
Shakesby, Richard A. Matthews, John A. Winkler, Stefan Glacier variations in Breheimen, southern Norway: relative-age dating of Holocene moraine complexes at six high-altitude glaciers |
author_facet |
Shakesby, Richard A. Matthews, John A. Winkler, Stefan |
author_sort |
Shakesby, Richard A. |
title |
Glacier variations in Breheimen, southern Norway: relative-age dating of Holocene moraine complexes at six high-altitude glaciers |
title_short |
Glacier variations in Breheimen, southern Norway: relative-age dating of Holocene moraine complexes at six high-altitude glaciers |
title_full |
Glacier variations in Breheimen, southern Norway: relative-age dating of Holocene moraine complexes at six high-altitude glaciers |
title_fullStr |
Glacier variations in Breheimen, southern Norway: relative-age dating of Holocene moraine complexes at six high-altitude glaciers |
title_full_unstemmed |
Glacier variations in Breheimen, southern Norway: relative-age dating of Holocene moraine complexes at six high-altitude glaciers |
title_sort |
glacier variations in breheimen, southern norway: relative-age dating of holocene moraine complexes at six high-altitude glaciers |
publisher |
SAGE Publications |
publishDate |
2004 |
url |
http://dx.doi.org/10.1191/0959683603hl766rp http://journals.sagepub.com/doi/pdf/10.1191/0959683603hl766rp |
genre |
glacier Ice permafrost |
genre_facet |
glacier Ice permafrost |
op_source |
The Holocene volume 14, issue 6, page 899-910 ISSN 0959-6836 1477-0911 |
op_rights |
http://journals.sagepub.com/page/policies/text-and-data-mining-license |
op_doi |
https://doi.org/10.1191/0959683603hl766rp |
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The Holocene |
container_volume |
14 |
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6 |
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899 |
op_container_end_page |
910 |
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1810445218588131328 |