Age and development of active cryoplanation terraces in the alpine permafrost zone at Svartkampan, Jotunheimen, southern Norway
Schmidt-hammer exposure-age dating (SHD) of boulders on cryoplanation terrace treads and associated bedrock cliff faces revealed Holocene ages ranging from 0 ± 825 to 8890 ± 1185 yr. The cliffs were significantly younger than the inner treads, which tended to be younger than the outer treads. Radioc...
Published in: | Quaternary Research |
---|---|
Main Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press (CUP)
2019
|
Subjects: | |
Online Access: | https://eprints.glos.ac.uk/7810/ https://eprints.glos.ac.uk/7810/1/7810-Hill-%282019%29-Age-and-development-of-active-cryoplanation-terraces.pdf https://doi.org/10.1017/qua.2019.41 |
id |
ftunigloucesters:oai:eprints.glos.ac.uk:7810 |
---|---|
record_format |
openpolar |
spelling |
ftunigloucesters:oai:eprints.glos.ac.uk:7810 2024-06-23T07:53:39+00:00 Age and development of active cryoplanation terraces in the alpine permafrost zone at Svartkampan, Jotunheimen, southern Norway Matthews, John A. Wilson, Peter Winkler, Stefan Mourne, Richard W. Hill, Jennifer L. Owen, Geraint Hiemstra, John F. Hallang, Helen Geary, Andrew P. 2019-11 text https://eprints.glos.ac.uk/7810/ https://eprints.glos.ac.uk/7810/1/7810-Hill-%282019%29-Age-and-development-of-active-cryoplanation-terraces.pdf https://doi.org/10.1017/qua.2019.41 en eng Cambridge University Press (CUP) https://eprints.glos.ac.uk/7810/1/7810-Hill-%282019%29-Age-and-development-of-active-cryoplanation-terraces.pdf Matthews, John A., Wilson, Peter, Winkler, Stefan, Mourne, Richard W., Hill, Jennifer L. orcid:0000-0002-0682-783X , Owen, Geraint, Hiemstra, John F., Hallang, Helen and Geary, Andrew P. (2019) Age and development of active cryoplanation terraces in the alpine permafrost zone at Svartkampan, Jotunheimen, southern Norway. Quaternary Research, 92 (3). pp. 641-664. doi:10.1017/qua.2019.41 <https://doi.org/10.1017/qua.2019.41> doi:10.1017/qua.2019.41 all_rights GB Physical geography Article PeerReviewed 2019 ftunigloucesters https://doi.org/10.1017/qua.2019.41 2024-06-12T03:30:31Z Schmidt-hammer exposure-age dating (SHD) of boulders on cryoplanation terrace treads and associated bedrock cliff faces revealed Holocene ages ranging from 0 ± 825 to 8890 ± 1185 yr. The cliffs were significantly younger than the inner treads, which tended to be younger than the outer treads. Radiocarbon dates from the regolith of 3854 to 4821 cal yr BP (2σ range) indicated maximum rates of cliff recession of ~0.1 mm/year, which suggests the onset of terrace formation prior to the last glacial maximum. Age, angularity and size of clasts, together with planation across bedrock structures and the seepage of groundwater from the cliff foot, all support a process-based conceptual model of cryoplanation terrace development in which frost weathering leads to parallel cliff recession and hence terrace extension. The availability of groundwater during autumn freeze-back is viewed as critical for frost wedging and/or the growth of segregation ice during prolonged winter frost penetration. Permafrost promotes cryoplanation by providing an impermeable frost table beneath the active layer, focusing groundwater flow, and supplying water for sediment transport by solifluction across the tread. Snowbeds are considered an effect rather than a cause of cryoplanation terraces and cryoplanation is seen as distinct from nivation. Article in Journal/Newspaper Ice permafrost University of Gloucestershire: Research Repository Norway Quaternary Research 92 3 641 664 |
institution |
Open Polar |
collection |
University of Gloucestershire: Research Repository |
op_collection_id |
ftunigloucesters |
language |
English |
topic |
GB Physical geography |
spellingShingle |
GB Physical geography Matthews, John A. Wilson, Peter Winkler, Stefan Mourne, Richard W. Hill, Jennifer L. Owen, Geraint Hiemstra, John F. Hallang, Helen Geary, Andrew P. Age and development of active cryoplanation terraces in the alpine permafrost zone at Svartkampan, Jotunheimen, southern Norway |
topic_facet |
GB Physical geography |
description |
Schmidt-hammer exposure-age dating (SHD) of boulders on cryoplanation terrace treads and associated bedrock cliff faces revealed Holocene ages ranging from 0 ± 825 to 8890 ± 1185 yr. The cliffs were significantly younger than the inner treads, which tended to be younger than the outer treads. Radiocarbon dates from the regolith of 3854 to 4821 cal yr BP (2σ range) indicated maximum rates of cliff recession of ~0.1 mm/year, which suggests the onset of terrace formation prior to the last glacial maximum. Age, angularity and size of clasts, together with planation across bedrock structures and the seepage of groundwater from the cliff foot, all support a process-based conceptual model of cryoplanation terrace development in which frost weathering leads to parallel cliff recession and hence terrace extension. The availability of groundwater during autumn freeze-back is viewed as critical for frost wedging and/or the growth of segregation ice during prolonged winter frost penetration. Permafrost promotes cryoplanation by providing an impermeable frost table beneath the active layer, focusing groundwater flow, and supplying water for sediment transport by solifluction across the tread. Snowbeds are considered an effect rather than a cause of cryoplanation terraces and cryoplanation is seen as distinct from nivation. |
format |
Article in Journal/Newspaper |
author |
Matthews, John A. Wilson, Peter Winkler, Stefan Mourne, Richard W. Hill, Jennifer L. Owen, Geraint Hiemstra, John F. Hallang, Helen Geary, Andrew P. |
author_facet |
Matthews, John A. Wilson, Peter Winkler, Stefan Mourne, Richard W. Hill, Jennifer L. Owen, Geraint Hiemstra, John F. Hallang, Helen Geary, Andrew P. |
author_sort |
Matthews, John A. |
title |
Age and development of active cryoplanation terraces in the alpine permafrost zone at Svartkampan, Jotunheimen, southern Norway |
title_short |
Age and development of active cryoplanation terraces in the alpine permafrost zone at Svartkampan, Jotunheimen, southern Norway |
title_full |
Age and development of active cryoplanation terraces in the alpine permafrost zone at Svartkampan, Jotunheimen, southern Norway |
title_fullStr |
Age and development of active cryoplanation terraces in the alpine permafrost zone at Svartkampan, Jotunheimen, southern Norway |
title_full_unstemmed |
Age and development of active cryoplanation terraces in the alpine permafrost zone at Svartkampan, Jotunheimen, southern Norway |
title_sort |
age and development of active cryoplanation terraces in the alpine permafrost zone at svartkampan, jotunheimen, southern norway |
publisher |
Cambridge University Press (CUP) |
publishDate |
2019 |
url |
https://eprints.glos.ac.uk/7810/ https://eprints.glos.ac.uk/7810/1/7810-Hill-%282019%29-Age-and-development-of-active-cryoplanation-terraces.pdf https://doi.org/10.1017/qua.2019.41 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_relation |
https://eprints.glos.ac.uk/7810/1/7810-Hill-%282019%29-Age-and-development-of-active-cryoplanation-terraces.pdf Matthews, John A., Wilson, Peter, Winkler, Stefan, Mourne, Richard W., Hill, Jennifer L. orcid:0000-0002-0682-783X , Owen, Geraint, Hiemstra, John F., Hallang, Helen and Geary, Andrew P. (2019) Age and development of active cryoplanation terraces in the alpine permafrost zone at Svartkampan, Jotunheimen, southern Norway. Quaternary Research, 92 (3). pp. 641-664. doi:10.1017/qua.2019.41 <https://doi.org/10.1017/qua.2019.41> doi:10.1017/qua.2019.41 |
op_rights |
all_rights |
op_doi |
https://doi.org/10.1017/qua.2019.41 |
container_title |
Quaternary Research |
container_volume |
92 |
container_issue |
3 |
container_start_page |
641 |
op_container_end_page |
664 |
_version_ |
1802645410851848192 |