Deformation of salt structures by ice-sheet loading: insights into the controlling parameters from numerical modelling
Subsurface salt flow is driven by differential loading, which is typically caused by tectonics or sedimentation. During glaciations, the weight of an ice sheet represents another source of differential loading. In salt-bearing basins affected by Pleistocene glaciations, such as the Central European...
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ftunivhannover:oai:www.repo.uni-hannover.de:123456789/15587 2023-12-24T10:17:35+01:00 Deformation of salt structures by ice-sheet loading: insights into the controlling parameters from numerical modelling Lang, Jörg Hampel, Andrea 2023 https://www.repo.uni-hannover.de/handle/123456789/15587 https://doi.org/10.15488/15466 eng eng Berlin Heidelberg : Springer DOI:https://doi.org/10.1007/s00531-023-02295-5 ISSN:1437-3254 ESSN:1437-3262 http://dx.doi.org/10.15488/15466 https://www.repo.uni-hannover.de/handle/123456789/15587 CC BY 4.0 Unported https://creativecommons.org/licenses/by/4.0 frei zugänglich International Journal of Earth Sciences 112 (2023), Nr. 4 International Journal of Earth Sciences Finite-element modelling (ABAQUS) Glaciation Ice-sheet loading Salt mechanics Salt structures ddc:550 status-type:publishedVersion doc-type:Article doc-type:Text 2023 ftunivhannover https://doi.org/10.15488/1546610.1007/s00531-023-02295-5 2023-11-26T23:47:00Z Subsurface salt flow is driven by differential loading, which is typically caused by tectonics or sedimentation. During glaciations, the weight of an ice sheet represents another source of differential loading. In salt-bearing basins affected by Pleistocene glaciations, such as the Central European Basin System, ice loading has been postulated as a trigger of young deformation at salt structures. Here, we present finite-element simulations (ABAQUS) with models based on a simplified 50-km long and 10-km-deep two-dimensional geological cross-section of a salt diapir subject to the load of a 300-m-thick ice sheet. The focus of our study is to evaluate the sensitivity of the model to material parameters, including linear and non-linear viscosity of the salt rocks and different elasticities. A spatially and temporarily variable pressure was applied to simulate ice loading. An ice advance towards the diapir causes lateral salt flow into the diapir and diapiric rise. Complete ice coverage leads to downward displacement of the diapir. After unloading, displacements are largely restored. The modelled displacements do not exceed few metres and are always larger in models with linear viscosity than in those with non-linear viscosity. Considering the low stresses caused by ice-sheet loading and the long time-scale, the application of linear viscosity seems appropriate. The elastic parameters also have a strong impact, with lower Young's moduli leading to larger deformation. The impact of both the viscosity and the elasticity highlights the importance of a careful parameter choice in numerical modelling, especially when aiming to replicate any real-world observations. Article in Journal/Newspaper Ice Sheet Institutional Repository of Leibniz Universität Hannover |
institution |
Open Polar |
collection |
Institutional Repository of Leibniz Universität Hannover |
op_collection_id |
ftunivhannover |
language |
English |
topic |
Finite-element modelling (ABAQUS) Glaciation Ice-sheet loading Salt mechanics Salt structures ddc:550 |
spellingShingle |
Finite-element modelling (ABAQUS) Glaciation Ice-sheet loading Salt mechanics Salt structures ddc:550 Lang, Jörg Hampel, Andrea Deformation of salt structures by ice-sheet loading: insights into the controlling parameters from numerical modelling |
topic_facet |
Finite-element modelling (ABAQUS) Glaciation Ice-sheet loading Salt mechanics Salt structures ddc:550 |
description |
Subsurface salt flow is driven by differential loading, which is typically caused by tectonics or sedimentation. During glaciations, the weight of an ice sheet represents another source of differential loading. In salt-bearing basins affected by Pleistocene glaciations, such as the Central European Basin System, ice loading has been postulated as a trigger of young deformation at salt structures. Here, we present finite-element simulations (ABAQUS) with models based on a simplified 50-km long and 10-km-deep two-dimensional geological cross-section of a salt diapir subject to the load of a 300-m-thick ice sheet. The focus of our study is to evaluate the sensitivity of the model to material parameters, including linear and non-linear viscosity of the salt rocks and different elasticities. A spatially and temporarily variable pressure was applied to simulate ice loading. An ice advance towards the diapir causes lateral salt flow into the diapir and diapiric rise. Complete ice coverage leads to downward displacement of the diapir. After unloading, displacements are largely restored. The modelled displacements do not exceed few metres and are always larger in models with linear viscosity than in those with non-linear viscosity. Considering the low stresses caused by ice-sheet loading and the long time-scale, the application of linear viscosity seems appropriate. The elastic parameters also have a strong impact, with lower Young's moduli leading to larger deformation. The impact of both the viscosity and the elasticity highlights the importance of a careful parameter choice in numerical modelling, especially when aiming to replicate any real-world observations. |
format |
Article in Journal/Newspaper |
author |
Lang, Jörg Hampel, Andrea |
author_facet |
Lang, Jörg Hampel, Andrea |
author_sort |
Lang, Jörg |
title |
Deformation of salt structures by ice-sheet loading: insights into the controlling parameters from numerical modelling |
title_short |
Deformation of salt structures by ice-sheet loading: insights into the controlling parameters from numerical modelling |
title_full |
Deformation of salt structures by ice-sheet loading: insights into the controlling parameters from numerical modelling |
title_fullStr |
Deformation of salt structures by ice-sheet loading: insights into the controlling parameters from numerical modelling |
title_full_unstemmed |
Deformation of salt structures by ice-sheet loading: insights into the controlling parameters from numerical modelling |
title_sort |
deformation of salt structures by ice-sheet loading: insights into the controlling parameters from numerical modelling |
publisher |
Berlin |
publishDate |
2023 |
url |
https://www.repo.uni-hannover.de/handle/123456789/15587 https://doi.org/10.15488/15466 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
International Journal of Earth Sciences 112 (2023), Nr. 4 International Journal of Earth Sciences |
op_relation |
DOI:https://doi.org/10.1007/s00531-023-02295-5 ISSN:1437-3254 ESSN:1437-3262 http://dx.doi.org/10.15488/15466 https://www.repo.uni-hannover.de/handle/123456789/15587 |
op_rights |
CC BY 4.0 Unported https://creativecommons.org/licenses/by/4.0 frei zugänglich |
op_doi |
https://doi.org/10.15488/1546610.1007/s00531-023-02295-5 |
_version_ |
1786205825091502080 |