Glacial and periglacial buzzsaws: fitting mechanisms to metaphors
Abstract The buzzsaw hypothesis refers to the potential for glacial and periglacial processes to rapidly denude mountains at and above glacier Equilibrium Line Altitudes (ELAs), irrespective of uplift rates, rock type or pre-existing topography. Here the appropriateness of the buzzsaw metaphor is ex...
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Cambridge University Press (CUP)
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crcambridgeupr:10.1016/j.yqres.2013.10.007 2024-09-15T18:12:27+00:00 Glacial and periglacial buzzsaws: fitting mechanisms to metaphors Hall, Adrian M. Kleman, Johan 2014 http://dx.doi.org/10.1016/j.yqres.2013.10.007 http://api.elsevier.com/content/article/PII:S0033589413001191?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589413001191?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400001836 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 81, issue 2, page 189-192 ISSN 0033-5894 1096-0287 journal-article 2014 crcambridgeupr https://doi.org/10.1016/j.yqres.2013.10.007 2024-07-03T04:04:14Z Abstract The buzzsaw hypothesis refers to the potential for glacial and periglacial processes to rapidly denude mountains at and above glacier Equilibrium Line Altitudes (ELAs), irrespective of uplift rates, rock type or pre-existing topography. Here the appropriateness of the buzzsaw metaphor is examined alongside questions of the links between glacial erosion and ELAs, and whether the glacial system can produce low-relief surfaces or limit summit heights. Plateau fragments in mountains on both active orogens and passive margins that have been cited as products of glacial and periglacial buzzsaw erosion instead generally represent dissected remnants of largely inherited, pre-glacial relief. Summit heights may correlate with ELAs but no causal link need be implied as summit erosion rates are low, cirque headwalls may not directly abut summits and on passive margins, cirques are cut into pre-existing mountain topography. Any simple links between ELAs and glacial erosion break down on passive margins due to topographic forcing of ice-sheet growth, and to the km-scale vertical swaths through which ELAs have shifted through the Quaternary. Glaciers destroy rather than create low-relief rock surfaces through the innate tendency for ice flow to be faster, thicker and warmer along valleys. The glacial buzzsaw cuts down. Article in Journal/Newspaper Ice Sheet Cambridge University Press Quaternary Research 81 2 189 192 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
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English |
description |
Abstract The buzzsaw hypothesis refers to the potential for glacial and periglacial processes to rapidly denude mountains at and above glacier Equilibrium Line Altitudes (ELAs), irrespective of uplift rates, rock type or pre-existing topography. Here the appropriateness of the buzzsaw metaphor is examined alongside questions of the links between glacial erosion and ELAs, and whether the glacial system can produce low-relief surfaces or limit summit heights. Plateau fragments in mountains on both active orogens and passive margins that have been cited as products of glacial and periglacial buzzsaw erosion instead generally represent dissected remnants of largely inherited, pre-glacial relief. Summit heights may correlate with ELAs but no causal link need be implied as summit erosion rates are low, cirque headwalls may not directly abut summits and on passive margins, cirques are cut into pre-existing mountain topography. Any simple links between ELAs and glacial erosion break down on passive margins due to topographic forcing of ice-sheet growth, and to the km-scale vertical swaths through which ELAs have shifted through the Quaternary. Glaciers destroy rather than create low-relief rock surfaces through the innate tendency for ice flow to be faster, thicker and warmer along valleys. The glacial buzzsaw cuts down. |
format |
Article in Journal/Newspaper |
author |
Hall, Adrian M. Kleman, Johan |
spellingShingle |
Hall, Adrian M. Kleman, Johan Glacial and periglacial buzzsaws: fitting mechanisms to metaphors |
author_facet |
Hall, Adrian M. Kleman, Johan |
author_sort |
Hall, Adrian M. |
title |
Glacial and periglacial buzzsaws: fitting mechanisms to metaphors |
title_short |
Glacial and periglacial buzzsaws: fitting mechanisms to metaphors |
title_full |
Glacial and periglacial buzzsaws: fitting mechanisms to metaphors |
title_fullStr |
Glacial and periglacial buzzsaws: fitting mechanisms to metaphors |
title_full_unstemmed |
Glacial and periglacial buzzsaws: fitting mechanisms to metaphors |
title_sort |
glacial and periglacial buzzsaws: fitting mechanisms to metaphors |
publisher |
Cambridge University Press (CUP) |
publishDate |
2014 |
url |
http://dx.doi.org/10.1016/j.yqres.2013.10.007 http://api.elsevier.com/content/article/PII:S0033589413001191?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589413001191?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400001836 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Quaternary Research volume 81, issue 2, page 189-192 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1016/j.yqres.2013.10.007 |
container_title |
Quaternary Research |
container_volume |
81 |
container_issue |
2 |
container_start_page |
189 |
op_container_end_page |
192 |
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1810450034943066112 |