Variations in tephra stratigraphy created by small-scale surface features in sub-polar landscapes
We explore the effect small-scale surface features have on influencing the morphology and grain-size distribution (GSD) of tephra layers within the Quaternary stratigraphy of sub-polar landscapes. Icelandic thúfur, small cryogenic earth mounds, are used to assess how and why the morphology and GSD o...
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2021
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Online Access: | https://research-portal.st-andrews.ac.uk/en/researchoutput/variations-in-tephra-stratigraphy-created-by-smallscale-surface-features-in-subpolar-landscapes(e4f15949-7482-4b99-b496-abdaceeff75e).html https://doi.org/10.1111/bor.12557 https://research-repository.st-andrews.ac.uk/bitstream/10023/24038/1/Thompson_2021_Boreas_Variations_tephra_CC.pdf https://onlinelibrary.wiley.com/doi/10.1111/bor.12557#support-information-section |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/e4f15949-7482-4b99-b496-abdaceeff75e 2024-06-23T07:53:32+00:00 Variations in tephra stratigraphy created by small-scale surface features in sub-polar landscapes Thompson, Polly I. J. Dugmore, Andrew J. Newton, Anthony J. Streeter, Richard T. Cutler, Nick A. 2021-09-25 application/pdf https://research-portal.st-andrews.ac.uk/en/researchoutput/variations-in-tephra-stratigraphy-created-by-smallscale-surface-features-in-subpolar-landscapes(e4f15949-7482-4b99-b496-abdaceeff75e).html https://doi.org/10.1111/bor.12557 https://research-repository.st-andrews.ac.uk/bitstream/10023/24038/1/Thompson_2021_Boreas_Variations_tephra_CC.pdf https://onlinelibrary.wiley.com/doi/10.1111/bor.12557#support-information-section eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/variations-in-tephra-stratigraphy-created-by-smallscale-surface-features-in-subpolar-landscapes(e4f15949-7482-4b99-b496-abdaceeff75e).html info:eu-repo/semantics/openAccess Thompson , P I J , Dugmore , A J , Newton , A J , Streeter , R T & Cutler , N A 2021 , ' Variations in tephra stratigraphy created by small-scale surface features in sub-polar landscapes ' , Boreas , vol. Early View . https://doi.org/10.1111/bor.12557 article 2021 ftunstandrewcris https://doi.org/10.1111/bor.12557 2024-06-13T01:18:33Z We explore the effect small-scale surface features have on influencing the morphology and grain-size distribution (GSD) of tephra layers within the Quaternary stratigraphy of sub-polar landscapes. Icelandic thúfur, small cryogenic earth mounds, are used to assess how and why the morphology and GSD of tephra layers vary over such formations. Through measurement of tephra layer thickness and GSD, Hekla 1947 and Grímsvötn 2011 tephra layers are analysed. Results indicate that such microtopographic features do indeed alter the form of tephra deposits and therefore the tephra layer that is preserved in the stratigraphy. Tephra thickness is significantly greater in hollows than on the thúfur crests. There is greater variation in tephra thickness measurements from thúfur in comparison to control measurements from a surface where thúfur are absent. Thúfur crests contain larger grain sizes than hollows, for both H1947 and G2011 tephras; however this was only statistically significant for the G2011 tephra. Such morphological patterns are thought to arise from an interplay of tephra characteristics, altered topography from the thúfur formations and earth surface processes operating at the sites. This study provides insight into the potential of tephra layer morphology and internal structures as indicators of Quaternary landforms and processes. Additionally, it provides important context for the appropriate sampling of tephra layers to infer volcanological processes, as the characteristics of preserved layers do not necessarily reflect those of the original fall-out. Article in Journal/Newspaper Hekla University of St Andrews: Research Portal Boreas 51 2 317 331 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
description |
We explore the effect small-scale surface features have on influencing the morphology and grain-size distribution (GSD) of tephra layers within the Quaternary stratigraphy of sub-polar landscapes. Icelandic thúfur, small cryogenic earth mounds, are used to assess how and why the morphology and GSD of tephra layers vary over such formations. Through measurement of tephra layer thickness and GSD, Hekla 1947 and Grímsvötn 2011 tephra layers are analysed. Results indicate that such microtopographic features do indeed alter the form of tephra deposits and therefore the tephra layer that is preserved in the stratigraphy. Tephra thickness is significantly greater in hollows than on the thúfur crests. There is greater variation in tephra thickness measurements from thúfur in comparison to control measurements from a surface where thúfur are absent. Thúfur crests contain larger grain sizes than hollows, for both H1947 and G2011 tephras; however this was only statistically significant for the G2011 tephra. Such morphological patterns are thought to arise from an interplay of tephra characteristics, altered topography from the thúfur formations and earth surface processes operating at the sites. This study provides insight into the potential of tephra layer morphology and internal structures as indicators of Quaternary landforms and processes. Additionally, it provides important context for the appropriate sampling of tephra layers to infer volcanological processes, as the characteristics of preserved layers do not necessarily reflect those of the original fall-out. |
format |
Article in Journal/Newspaper |
author |
Thompson, Polly I. J. Dugmore, Andrew J. Newton, Anthony J. Streeter, Richard T. Cutler, Nick A. |
spellingShingle |
Thompson, Polly I. J. Dugmore, Andrew J. Newton, Anthony J. Streeter, Richard T. Cutler, Nick A. Variations in tephra stratigraphy created by small-scale surface features in sub-polar landscapes |
author_facet |
Thompson, Polly I. J. Dugmore, Andrew J. Newton, Anthony J. Streeter, Richard T. Cutler, Nick A. |
author_sort |
Thompson, Polly I. J. |
title |
Variations in tephra stratigraphy created by small-scale surface features in sub-polar landscapes |
title_short |
Variations in tephra stratigraphy created by small-scale surface features in sub-polar landscapes |
title_full |
Variations in tephra stratigraphy created by small-scale surface features in sub-polar landscapes |
title_fullStr |
Variations in tephra stratigraphy created by small-scale surface features in sub-polar landscapes |
title_full_unstemmed |
Variations in tephra stratigraphy created by small-scale surface features in sub-polar landscapes |
title_sort |
variations in tephra stratigraphy created by small-scale surface features in sub-polar landscapes |
publishDate |
2021 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/variations-in-tephra-stratigraphy-created-by-smallscale-surface-features-in-subpolar-landscapes(e4f15949-7482-4b99-b496-abdaceeff75e).html https://doi.org/10.1111/bor.12557 https://research-repository.st-andrews.ac.uk/bitstream/10023/24038/1/Thompson_2021_Boreas_Variations_tephra_CC.pdf https://onlinelibrary.wiley.com/doi/10.1111/bor.12557#support-information-section |
genre |
Hekla |
genre_facet |
Hekla |
op_source |
Thompson , P I J , Dugmore , A J , Newton , A J , Streeter , R T & Cutler , N A 2021 , ' Variations in tephra stratigraphy created by small-scale surface features in sub-polar landscapes ' , Boreas , vol. Early View . https://doi.org/10.1111/bor.12557 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/variations-in-tephra-stratigraphy-created-by-smallscale-surface-features-in-subpolar-landscapes(e4f15949-7482-4b99-b496-abdaceeff75e).html |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1111/bor.12557 |
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Boreas |
container_volume |
51 |
container_issue |
2 |
container_start_page |
317 |
op_container_end_page |
331 |
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1802645254558449664 |