Styles of subglacial glaciotectonic deformation within the context of the anglian ice‐sheet
Abstract A substantial proportion of the glacial sediments of East Anglia, England, are chaotic and highly deformed. This has been attributed to (a) direct glaciotectonic deformation or (b) slumping of glaciomarine sediments. We show that interpretation (a) leads to a classification of subglacial gl...
Published in: | Earth Surface Processes and Landforms |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
1990
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1002/esp.3290150305 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fesp.3290150305 https://onlinelibrary.wiley.com/doi/pdf/10.1002/esp.3290150305 |
id |
crwiley:10.1002/esp.3290150305 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1002/esp.3290150305 2024-06-02T08:08:14+00:00 Styles of subglacial glaciotectonic deformation within the context of the anglian ice‐sheet Hart, Jane K. Hindmarsh, Richard C. A. Boulton, Geoffrey S. 1990 http://dx.doi.org/10.1002/esp.3290150305 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fesp.3290150305 https://onlinelibrary.wiley.com/doi/pdf/10.1002/esp.3290150305 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Earth Surface Processes and Landforms volume 15, issue 3, page 227-241 ISSN 0197-9337 1096-9837 journal-article 1990 crwiley https://doi.org/10.1002/esp.3290150305 2024-05-03T11:39:42Z Abstract A substantial proportion of the glacial sediments of East Anglia, England, are chaotic and highly deformed. This has been attributed to (a) direct glaciotectonic deformation or (b) slumping of glaciomarine sediments. We show that interpretation (a) leads to a classification of subglacial glaciotectonic deposits into sites of ‘constructional deformation’, where little or no erosion of the preglacial deposits has occurred and styles of deformation are preserved moving up in the sequence, and ‘excavational deformation’, where substantial erosion of preglacial sediments has occurred and deformational styles are superimposed on each other. By using glaciological and geotechnical theory, we show that the expression of these deformational styles in East Anglia is a natural response to the stress fields imposed by the ice‐sheet, and that in consequence their spatial relationships are explicable. The depth of deformation is related to the geotechnical properties of till and substrate, the stress and effective stress fields, and found to be consistent with observations. Article in Journal/Newspaper Ice Sheet Wiley Online Library Earth Surface Processes and Landforms 15 3 227 241 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract A substantial proportion of the glacial sediments of East Anglia, England, are chaotic and highly deformed. This has been attributed to (a) direct glaciotectonic deformation or (b) slumping of glaciomarine sediments. We show that interpretation (a) leads to a classification of subglacial glaciotectonic deposits into sites of ‘constructional deformation’, where little or no erosion of the preglacial deposits has occurred and styles of deformation are preserved moving up in the sequence, and ‘excavational deformation’, where substantial erosion of preglacial sediments has occurred and deformational styles are superimposed on each other. By using glaciological and geotechnical theory, we show that the expression of these deformational styles in East Anglia is a natural response to the stress fields imposed by the ice‐sheet, and that in consequence their spatial relationships are explicable. The depth of deformation is related to the geotechnical properties of till and substrate, the stress and effective stress fields, and found to be consistent with observations. |
format |
Article in Journal/Newspaper |
author |
Hart, Jane K. Hindmarsh, Richard C. A. Boulton, Geoffrey S. |
spellingShingle |
Hart, Jane K. Hindmarsh, Richard C. A. Boulton, Geoffrey S. Styles of subglacial glaciotectonic deformation within the context of the anglian ice‐sheet |
author_facet |
Hart, Jane K. Hindmarsh, Richard C. A. Boulton, Geoffrey S. |
author_sort |
Hart, Jane K. |
title |
Styles of subglacial glaciotectonic deformation within the context of the anglian ice‐sheet |
title_short |
Styles of subglacial glaciotectonic deformation within the context of the anglian ice‐sheet |
title_full |
Styles of subglacial glaciotectonic deformation within the context of the anglian ice‐sheet |
title_fullStr |
Styles of subglacial glaciotectonic deformation within the context of the anglian ice‐sheet |
title_full_unstemmed |
Styles of subglacial glaciotectonic deformation within the context of the anglian ice‐sheet |
title_sort |
styles of subglacial glaciotectonic deformation within the context of the anglian ice‐sheet |
publisher |
Wiley |
publishDate |
1990 |
url |
http://dx.doi.org/10.1002/esp.3290150305 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fesp.3290150305 https://onlinelibrary.wiley.com/doi/pdf/10.1002/esp.3290150305 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Earth Surface Processes and Landforms volume 15, issue 3, page 227-241 ISSN 0197-9337 1096-9837 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/esp.3290150305 |
container_title |
Earth Surface Processes and Landforms |
container_volume |
15 |
container_issue |
3 |
container_start_page |
227 |
op_container_end_page |
241 |
_version_ |
1800753428068040704 |