What and where are periglacial landscapes?
Abstract Uncertainties about landscape evolution under cold, nonglacial conditions raise a question fundamental to periglacial geomorphology: what and where are periglacial landscapes? To answer this, with an emphasis on lowland periglacial areas, the present study distinguishes between characterist...
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crwiley:10.1002/ppp.2102 2024-06-09T07:46:39+00:00 What and where are periglacial landscapes? Murton, Julian B. 2021 http://dx.doi.org/10.1002/ppp.2102 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.2102 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ppp.2102 en eng Wiley http://creativecommons.org/licenses/by-nc/4.0/ Permafrost and Periglacial Processes volume 32, issue 2, page 186-212 ISSN 1045-6740 1099-1530 journal-article 2021 crwiley https://doi.org/10.1002/ppp.2102 2024-05-16T14:26:37Z Abstract Uncertainties about landscape evolution under cold, nonglacial conditions raise a question fundamental to periglacial geomorphology: what and where are periglacial landscapes? To answer this, with an emphasis on lowland periglacial areas, the present study distinguishes between characteristic and polygenetic periglacial landscapes, and considers how complete is the footprint of periglaciation? Using a conceptual framework of landscape sensitivity and change, the study applies four geological criteria (periglacial persistence, extraglacial regions, ice‐rich substrates, and aggradation of sediment and permafrost) through the last 3.5 million years of the late Cenozoic to identify permafrost regions in the Northern Hemisphere. In limited areas of unglaciated permafrost regions are characteristic periglacial landscapes whose morphology has been adjusted essentially to present (i.e., Holocene interglacial) process conditions, namely thermokarst landscapes, and mixed periglacial–alluvial and periglacial–deltaic landscapes. More widespread in past and present permafrost regions are polygenetic periglacial landscapes, which inherit ancient landsurfaces on which periglacial landforms are superimposed to varying degrees, presently or previously. Such landscapes comprise relict accumulation plains and aprons, frost‐susceptible and nonfrost‐susceptible terrains, cryopediments, and glacial–periglacial landscapes. Periglaciation can produce topographic fingerprints at mesospatial scales (10 3 –10 5 m): (1) relict accumulation plains and aprons form where long‐term sedimentation buried landsurfaces; and (2) plateaux with convexo–concave hillslopes and inset with valleys, formed by bedrock brecciation, mass wasting, and stream incision in frost‐susceptible terrain. Article in Journal/Newspaper Ice permafrost Permafrost and Periglacial Processes Thermokarst Wiley Online Library Permafrost and Periglacial Processes 32 2 186 212 |
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Abstract Uncertainties about landscape evolution under cold, nonglacial conditions raise a question fundamental to periglacial geomorphology: what and where are periglacial landscapes? To answer this, with an emphasis on lowland periglacial areas, the present study distinguishes between characteristic and polygenetic periglacial landscapes, and considers how complete is the footprint of periglaciation? Using a conceptual framework of landscape sensitivity and change, the study applies four geological criteria (periglacial persistence, extraglacial regions, ice‐rich substrates, and aggradation of sediment and permafrost) through the last 3.5 million years of the late Cenozoic to identify permafrost regions in the Northern Hemisphere. In limited areas of unglaciated permafrost regions are characteristic periglacial landscapes whose morphology has been adjusted essentially to present (i.e., Holocene interglacial) process conditions, namely thermokarst landscapes, and mixed periglacial–alluvial and periglacial–deltaic landscapes. More widespread in past and present permafrost regions are polygenetic periglacial landscapes, which inherit ancient landsurfaces on which periglacial landforms are superimposed to varying degrees, presently or previously. Such landscapes comprise relict accumulation plains and aprons, frost‐susceptible and nonfrost‐susceptible terrains, cryopediments, and glacial–periglacial landscapes. Periglaciation can produce topographic fingerprints at mesospatial scales (10 3 –10 5 m): (1) relict accumulation plains and aprons form where long‐term sedimentation buried landsurfaces; and (2) plateaux with convexo–concave hillslopes and inset with valleys, formed by bedrock brecciation, mass wasting, and stream incision in frost‐susceptible terrain. |
format |
Article in Journal/Newspaper |
author |
Murton, Julian B. |
spellingShingle |
Murton, Julian B. What and where are periglacial landscapes? |
author_facet |
Murton, Julian B. |
author_sort |
Murton, Julian B. |
title |
What and where are periglacial landscapes? |
title_short |
What and where are periglacial landscapes? |
title_full |
What and where are periglacial landscapes? |
title_fullStr |
What and where are periglacial landscapes? |
title_full_unstemmed |
What and where are periglacial landscapes? |
title_sort |
what and where are periglacial landscapes? |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1002/ppp.2102 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.2102 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ppp.2102 |
genre |
Ice permafrost Permafrost and Periglacial Processes Thermokarst |
genre_facet |
Ice permafrost Permafrost and Periglacial Processes Thermokarst |
op_source |
Permafrost and Periglacial Processes volume 32, issue 2, page 186-212 ISSN 1045-6740 1099-1530 |
op_rights |
http://creativecommons.org/licenses/by-nc/4.0/ |
op_doi |
https://doi.org/10.1002/ppp.2102 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
32 |
container_issue |
2 |
container_start_page |
186 |
op_container_end_page |
212 |
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1801376610159427584 |