Landform transitions from pronival ramparts to moraines and rock glaciers: A case study from the Smørbotn cirque, Romsdalsalpane, southern Norway
Landform transitions are defined as intermediate forms that represent transient developmental stages between conventional landform types. This study evaluates possible cases of landform transitions from pronival (protalus) ramparts to moraine ridges, and from pronival ramparts to lobate rock glacier...
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Taylor and Francis
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ftuniwestengland:oai:eprints.uwe.ac.uk:30633 2023-05-15T16:21:58+02:00 Landform transitions from pronival ramparts to moraines and rock glaciers: A case study from the Smørbotn cirque, Romsdalsalpane, southern Norway Matthews, J. A. Wilson, P. Mourne, R. 2017-01 application/msword application/pdf http://eprints.uwe.ac.uk/30633/ http://eprints.uwe.ac.uk/30633/1/Landform%20transitions%20-%20text%20and%20table%201.doc http://eprints.uwe.ac.uk/30633/2/Landform%20transitions%20-%20text%20and%20table%201.pdf http://www.tandfonline.com/doi/pdf/10.1080/04353676.2016.1256582?needAccess=true en eng Taylor and Francis http://eprints.uwe.ac.uk/30633/1/Landform%20transitions%20-%20text%20and%20table%201.doc http://eprints.uwe.ac.uk/30633/2/Landform%20transitions%20-%20text%20and%20table%201.pdf Matthews, J. A. , Wilson, P. and Mourne, R. (2017) Landform transitions from pronival ramparts to moraines and rock glaciers: A case study from the Smørbotn cirque, Romsdalsalpane, southern Norway. Geografiska Annaler: Series A, Physical Geography, 99 (1). pp. 15-37. ISSN 0435-3676 Available from: http://eprints.uwe.ac.uk/30633 all_rights_reserved Article NonPeerReviewed 2017 ftuniwestengland 2020-08-21T16:10:26Z Landform transitions are defined as intermediate forms that represent transient developmental stages between conventional landform types. This study evaluates possible cases of landform transitions from pronival (protalus) ramparts to moraine ridges, and from pronival ramparts to lobate rock glaciers (protalus lobes) at the foot of the headwall of Smørbotn cirque in southern Norway. The five landforms had been previously classified as pronival ramparts. We conclude that only two (Smørbotn 2 and 3) are undisputed, active pronival ramparts, which developed under the seasonal-freezing regime of the Holocene. It is inferred that a third (Smørbotn 1) represents the transition to a moraine ridge formed during the ‘Little Ice Age’ of the last few centuries as a semi-permanent snowbed grew into a small temperate glacier. The two others (Smørbotn 7 and 8) appear to be relict embryonic rock glaciers that developed between the Last Glacial Maximum and the Younger Dryas Stadial under a permafrost regime and benefited from enhanced debris supply as a result of rock-slope instability affected by glacier debuttressing and permafrost degradation. Variable landscape settings and distinctive environmental histories contribute to the differences in the morphology of these landforms. We highlight continuing controversies over the modes of formation and diagnostic characteristics of pronival ramparts by positioning them, together with push/dump moraines, ice-cored moraines and rock glaciers, in a conceptual model of the periglacial–glacial landform continuum. The model links snow, ice and debris fluxes under seasonal-freezing and/or permafrost climatic regimes to the process thresholds between landform types. Article in Journal/Newspaper glacier Ice permafrost University of the West of England, Bristol: UWE Research Repository Moraine Ridge ENVELOPE(168.050,168.050,-72.300,-72.300) Norway |
institution |
Open Polar |
collection |
University of the West of England, Bristol: UWE Research Repository |
op_collection_id |
ftuniwestengland |
language |
English |
description |
Landform transitions are defined as intermediate forms that represent transient developmental stages between conventional landform types. This study evaluates possible cases of landform transitions from pronival (protalus) ramparts to moraine ridges, and from pronival ramparts to lobate rock glaciers (protalus lobes) at the foot of the headwall of Smørbotn cirque in southern Norway. The five landforms had been previously classified as pronival ramparts. We conclude that only two (Smørbotn 2 and 3) are undisputed, active pronival ramparts, which developed under the seasonal-freezing regime of the Holocene. It is inferred that a third (Smørbotn 1) represents the transition to a moraine ridge formed during the ‘Little Ice Age’ of the last few centuries as a semi-permanent snowbed grew into a small temperate glacier. The two others (Smørbotn 7 and 8) appear to be relict embryonic rock glaciers that developed between the Last Glacial Maximum and the Younger Dryas Stadial under a permafrost regime and benefited from enhanced debris supply as a result of rock-slope instability affected by glacier debuttressing and permafrost degradation. Variable landscape settings and distinctive environmental histories contribute to the differences in the morphology of these landforms. We highlight continuing controversies over the modes of formation and diagnostic characteristics of pronival ramparts by positioning them, together with push/dump moraines, ice-cored moraines and rock glaciers, in a conceptual model of the periglacial–glacial landform continuum. The model links snow, ice and debris fluxes under seasonal-freezing and/or permafrost climatic regimes to the process thresholds between landform types. |
format |
Article in Journal/Newspaper |
author |
Matthews, J. A. Wilson, P. Mourne, R. |
spellingShingle |
Matthews, J. A. Wilson, P. Mourne, R. Landform transitions from pronival ramparts to moraines and rock glaciers: A case study from the Smørbotn cirque, Romsdalsalpane, southern Norway |
author_facet |
Matthews, J. A. Wilson, P. Mourne, R. |
author_sort |
Matthews, J. A. |
title |
Landform transitions from pronival ramparts to moraines and rock glaciers: A case study from the Smørbotn cirque, Romsdalsalpane, southern Norway |
title_short |
Landform transitions from pronival ramparts to moraines and rock glaciers: A case study from the Smørbotn cirque, Romsdalsalpane, southern Norway |
title_full |
Landform transitions from pronival ramparts to moraines and rock glaciers: A case study from the Smørbotn cirque, Romsdalsalpane, southern Norway |
title_fullStr |
Landform transitions from pronival ramparts to moraines and rock glaciers: A case study from the Smørbotn cirque, Romsdalsalpane, southern Norway |
title_full_unstemmed |
Landform transitions from pronival ramparts to moraines and rock glaciers: A case study from the Smørbotn cirque, Romsdalsalpane, southern Norway |
title_sort |
landform transitions from pronival ramparts to moraines and rock glaciers: a case study from the smørbotn cirque, romsdalsalpane, southern norway |
publisher |
Taylor and Francis |
publishDate |
2017 |
url |
http://eprints.uwe.ac.uk/30633/ http://eprints.uwe.ac.uk/30633/1/Landform%20transitions%20-%20text%20and%20table%201.doc http://eprints.uwe.ac.uk/30633/2/Landform%20transitions%20-%20text%20and%20table%201.pdf http://www.tandfonline.com/doi/pdf/10.1080/04353676.2016.1256582?needAccess=true |
long_lat |
ENVELOPE(168.050,168.050,-72.300,-72.300) |
geographic |
Moraine Ridge Norway |
geographic_facet |
Moraine Ridge Norway |
genre |
glacier Ice permafrost |
genre_facet |
glacier Ice permafrost |
op_relation |
http://eprints.uwe.ac.uk/30633/1/Landform%20transitions%20-%20text%20and%20table%201.doc http://eprints.uwe.ac.uk/30633/2/Landform%20transitions%20-%20text%20and%20table%201.pdf Matthews, J. A. , Wilson, P. and Mourne, R. (2017) Landform transitions from pronival ramparts to moraines and rock glaciers: A case study from the Smørbotn cirque, Romsdalsalpane, southern Norway. Geografiska Annaler: Series A, Physical Geography, 99 (1). pp. 15-37. ISSN 0435-3676 Available from: http://eprints.uwe.ac.uk/30633 |
op_rights |
all_rights_reserved |
_version_ |
1766009934063861760 |