Glacial isostasy and the interplay between upper and lower mantle lateral viscosity heterogeneities
From the analysis of sea‐level data near the centre of the former Fennoscandian ice sheet and the theoretical predictions of vertically and laterally stratified Earth models, we explore the extent to which lateral viscosity variations could have influenced the estimate of long term mantle viscosity....
Published in: | Geophysical Research Letters |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
1989
|
Subjects: | |
Online Access: | https://hdl.handle.net/11585/951402 https://doi.org/10.1029/GL016i005p00429 |
id |
ftunibolognairis:oai:cris.unibo.it:11585/951402 |
---|---|
record_format |
openpolar |
spelling |
ftunibolognairis:oai:cris.unibo.it:11585/951402 2024-05-19T07:40:12+00:00 Glacial isostasy and the interplay between upper and lower mantle lateral viscosity heterogeneities Sabadini R. Gasperini P. Sabadini R. Gasperini P. 1989 STAMPA https://hdl.handle.net/11585/951402 https://doi.org/10.1029/GL016i005p00429 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:A1989U492700023 volume:16 issue:5 firstpage:429 lastpage:432 numberofpages:4 journal:GEOPHYSICAL RESEARCH LETTERS https://hdl.handle.net/11585/951402 doi:10.1029/GL016i005p00429 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-0024528277 Mantle Rheology info:eu-repo/semantics/article 1989 ftunibolognairis https://doi.org/10.1029/GL016i005p00429 2024-04-26T00:18:23Z From the analysis of sea‐level data near the centre of the former Fennoscandian ice sheet and the theoretical predictions of vertically and laterally stratified Earth models, we explore the extent to which lateral viscosity variations could have influenced the estimate of long term mantle viscosity. We follow a finite element scheme in cylindrical symmetry, focusing on the effects of lateral viscosity contrasts of different magnitudes and wavelengths. Sea‐levels are consistent with long wavelength lateral viscosity contrasts of at most 2 orders of magnitude; short wavelength variations, comparable with the lateral extension of the surface load, should be ruled out. Differences in the average viscosities inferred from laterally stratified and uniform mantle models, may be as high as 1 order of magnitude. If we allow for different lateral viscosity patterns in the upper and lower mantle, we find that sea‐levels are consistent with short wavelength variations in the upper mantle of around 2 orders of magnitude, coupled with smoother lateral viscosity contrasts in the lower mantle. Copyright 1989 by the American Geophysical Union. Article in Journal/Newspaper Fennoscandian Ice Sheet IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) Geophysical Research Letters 16 5 429 432 |
institution |
Open Polar |
collection |
IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) |
op_collection_id |
ftunibolognairis |
language |
English |
topic |
Mantle Rheology |
spellingShingle |
Mantle Rheology Sabadini R. Gasperini P. Glacial isostasy and the interplay between upper and lower mantle lateral viscosity heterogeneities |
topic_facet |
Mantle Rheology |
description |
From the analysis of sea‐level data near the centre of the former Fennoscandian ice sheet and the theoretical predictions of vertically and laterally stratified Earth models, we explore the extent to which lateral viscosity variations could have influenced the estimate of long term mantle viscosity. We follow a finite element scheme in cylindrical symmetry, focusing on the effects of lateral viscosity contrasts of different magnitudes and wavelengths. Sea‐levels are consistent with long wavelength lateral viscosity contrasts of at most 2 orders of magnitude; short wavelength variations, comparable with the lateral extension of the surface load, should be ruled out. Differences in the average viscosities inferred from laterally stratified and uniform mantle models, may be as high as 1 order of magnitude. If we allow for different lateral viscosity patterns in the upper and lower mantle, we find that sea‐levels are consistent with short wavelength variations in the upper mantle of around 2 orders of magnitude, coupled with smoother lateral viscosity contrasts in the lower mantle. Copyright 1989 by the American Geophysical Union. |
author2 |
Sabadini R. Gasperini P. |
format |
Article in Journal/Newspaper |
author |
Sabadini R. Gasperini P. |
author_facet |
Sabadini R. Gasperini P. |
author_sort |
Sabadini R. |
title |
Glacial isostasy and the interplay between upper and lower mantle lateral viscosity heterogeneities |
title_short |
Glacial isostasy and the interplay between upper and lower mantle lateral viscosity heterogeneities |
title_full |
Glacial isostasy and the interplay between upper and lower mantle lateral viscosity heterogeneities |
title_fullStr |
Glacial isostasy and the interplay between upper and lower mantle lateral viscosity heterogeneities |
title_full_unstemmed |
Glacial isostasy and the interplay between upper and lower mantle lateral viscosity heterogeneities |
title_sort |
glacial isostasy and the interplay between upper and lower mantle lateral viscosity heterogeneities |
publishDate |
1989 |
url |
https://hdl.handle.net/11585/951402 https://doi.org/10.1029/GL016i005p00429 |
genre |
Fennoscandian Ice Sheet |
genre_facet |
Fennoscandian Ice Sheet |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:A1989U492700023 volume:16 issue:5 firstpage:429 lastpage:432 numberofpages:4 journal:GEOPHYSICAL RESEARCH LETTERS https://hdl.handle.net/11585/951402 doi:10.1029/GL016i005p00429 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-0024528277 |
op_doi |
https://doi.org/10.1029/GL016i005p00429 |
container_title |
Geophysical Research Letters |
container_volume |
16 |
container_issue |
5 |
container_start_page |
429 |
op_container_end_page |
432 |
_version_ |
1799479777900363776 |