Linear or non-linear rheology in the Earth’s mantle: the prevalence of power-law creep in the postglacial isostatic readjustment of Laurentia
namics The great majority of postglacial rebound computations carried out during the last three decades assumed a purely linear rheological relation for the mantle. Experimental data on high-temperature creep deformation and modelling of other tectonic processes, however, might also support the exis...
Published in: | Geophysical Journal International |
---|---|
Main Authors: | , , |
Other Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2004
|
Subjects: | |
Online Access: | http://hdl.handle.net/11585/4414 https://doi.org/10.1111/j.1365-246X.2004.02319.x |
id |
ftunibolognairis:oai:cris.unibo.it:11585/4414 |
---|---|
record_format |
openpolar |
spelling |
ftunibolognairis:oai:cris.unibo.it:11585/4414 2024-04-28T08:24:59+00:00 Linear or non-linear rheology in the Earth’s mantle: the prevalence of power-law creep in the postglacial isostatic readjustment of Laurentia GASPERINI, PAOLO DAL FORNO, GIULIO BOSCHI, ENZO P. Gasperini G. Dal Forno E. Boschi 2004 STAMPA http://hdl.handle.net/11585/4414 https://doi.org/10.1111/j.1365-246X.2004.02319.x eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000222667100025 volume:157 firstpage:1297 lastpage:1302 numberofpages:6 journal:GEOPHYSICAL JOURNAL INTERNATIONAL http://hdl.handle.net/11585/4414 doi:10.1111/j.1365-246X.2004.02319.x info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-3142710186 LAURENTIDE ICE SHEET NON-LINEAR RHEOLOGY POSTGLACIAL REBOUND POWER-LAW CREEP RELATIVE SEA-LEVEL VARIATIONS info:eu-repo/semantics/article 2004 ftunibolognairis https://doi.org/10.1111/j.1365-246X.2004.02319.x 2024-04-05T00:31:06Z namics The great majority of postglacial rebound computations carried out during the last three decades assumed a purely linear rheological relation for the mantle. Experimental data on high-temperature creep deformation and modelling of other tectonic processes, however, might also support the existence of non-linear creep mechanisms. We addressed postglacial rebound in North America through an axially symmetric finite-element model with a composite (linear plus non-linear) mantle rheology. In such a formulation, the transition stress σ T governs the balance between linear and non-linear creep components, while the term σ B, added to the effective shear stress, accounts for the background (ambient) stress induced by convection and other tectonic processes. By varying σ T and σ B in the ranges 0–10 MPa and 0–5 MPa respectively, we found that composite models fit Relative Sea Level (RSL) variations at 29 North American sites better than the purely linear model. On the basis of the effective shear stress induced in the mantle by glacial forcing (1–3 MPa), our results indicate that power-law creep accounts for the majority of the strain rate. Article in Journal/Newspaper Ice Sheet IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) Geophysical Journal International 157 3 1297 1302 |
institution |
Open Polar |
collection |
IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) |
op_collection_id |
ftunibolognairis |
language |
English |
topic |
LAURENTIDE ICE SHEET NON-LINEAR RHEOLOGY POSTGLACIAL REBOUND POWER-LAW CREEP RELATIVE SEA-LEVEL VARIATIONS |
spellingShingle |
LAURENTIDE ICE SHEET NON-LINEAR RHEOLOGY POSTGLACIAL REBOUND POWER-LAW CREEP RELATIVE SEA-LEVEL VARIATIONS GASPERINI, PAOLO DAL FORNO, GIULIO BOSCHI, ENZO Linear or non-linear rheology in the Earth’s mantle: the prevalence of power-law creep in the postglacial isostatic readjustment of Laurentia |
topic_facet |
LAURENTIDE ICE SHEET NON-LINEAR RHEOLOGY POSTGLACIAL REBOUND POWER-LAW CREEP RELATIVE SEA-LEVEL VARIATIONS |
description |
namics The great majority of postglacial rebound computations carried out during the last three decades assumed a purely linear rheological relation for the mantle. Experimental data on high-temperature creep deformation and modelling of other tectonic processes, however, might also support the existence of non-linear creep mechanisms. We addressed postglacial rebound in North America through an axially symmetric finite-element model with a composite (linear plus non-linear) mantle rheology. In such a formulation, the transition stress σ T governs the balance between linear and non-linear creep components, while the term σ B, added to the effective shear stress, accounts for the background (ambient) stress induced by convection and other tectonic processes. By varying σ T and σ B in the ranges 0–10 MPa and 0–5 MPa respectively, we found that composite models fit Relative Sea Level (RSL) variations at 29 North American sites better than the purely linear model. On the basis of the effective shear stress induced in the mantle by glacial forcing (1–3 MPa), our results indicate that power-law creep accounts for the majority of the strain rate. |
author2 |
P. Gasperini G. Dal Forno E. Boschi |
format |
Article in Journal/Newspaper |
author |
GASPERINI, PAOLO DAL FORNO, GIULIO BOSCHI, ENZO |
author_facet |
GASPERINI, PAOLO DAL FORNO, GIULIO BOSCHI, ENZO |
author_sort |
GASPERINI, PAOLO |
title |
Linear or non-linear rheology in the Earth’s mantle: the prevalence of power-law creep in the postglacial isostatic readjustment of Laurentia |
title_short |
Linear or non-linear rheology in the Earth’s mantle: the prevalence of power-law creep in the postglacial isostatic readjustment of Laurentia |
title_full |
Linear or non-linear rheology in the Earth’s mantle: the prevalence of power-law creep in the postglacial isostatic readjustment of Laurentia |
title_fullStr |
Linear or non-linear rheology in the Earth’s mantle: the prevalence of power-law creep in the postglacial isostatic readjustment of Laurentia |
title_full_unstemmed |
Linear or non-linear rheology in the Earth’s mantle: the prevalence of power-law creep in the postglacial isostatic readjustment of Laurentia |
title_sort |
linear or non-linear rheology in the earth’s mantle: the prevalence of power-law creep in the postglacial isostatic readjustment of laurentia |
publishDate |
2004 |
url |
http://hdl.handle.net/11585/4414 https://doi.org/10.1111/j.1365-246X.2004.02319.x |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000222667100025 volume:157 firstpage:1297 lastpage:1302 numberofpages:6 journal:GEOPHYSICAL JOURNAL INTERNATIONAL http://hdl.handle.net/11585/4414 doi:10.1111/j.1365-246X.2004.02319.x info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-3142710186 |
op_doi |
https://doi.org/10.1111/j.1365-246X.2004.02319.x |
container_title |
Geophysical Journal International |
container_volume |
157 |
container_issue |
3 |
container_start_page |
1297 |
op_container_end_page |
1302 |
_version_ |
1797584965273124864 |