The three-dimensional lithospheric structure of the Falkland Plateau region based on gravity modelling
The lithospheric structure of the Falkland Plateau region has been modelled by making an initial estimate on the basis of local isostasy and then refining the geometries by inversion of gravity anomalies. The model predicts a crustal thickness beneath the Falkland Plateau Basin that is more than twi...
Published in: | Journal of the Geological Society |
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Language: | English |
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Geological Society of London
2008
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Online Access: | http://nora.nerc.ac.uk/id/eprint/3784/ https://nora.nerc.ac.uk/id/eprint/3784/1/falklands_3dmod_paper.pdf http://jgs.geoscienceworld.org/content/vol165/issue4/ |
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ftnerc:oai:nora.nerc.ac.uk:3784 2024-06-09T07:40:43+00:00 The three-dimensional lithospheric structure of the Falkland Plateau region based on gravity modelling Kimbell, Geoffrey Richards, Philip 2008 text http://nora.nerc.ac.uk/id/eprint/3784/ https://nora.nerc.ac.uk/id/eprint/3784/1/falklands_3dmod_paper.pdf http://jgs.geoscienceworld.org/content/vol165/issue4/ en eng Geological Society of London https://nora.nerc.ac.uk/id/eprint/3784/1/falklands_3dmod_paper.pdf Kimbell, Geoffrey; Richards, Philip. 2008 The three-dimensional lithospheric structure of the Falkland Plateau region based on gravity modelling. Journal of the Geological Society, 165 (4). 795-806. https://doi.org/10.1144/0016-76492007-114 <https://doi.org/10.1144/0016-76492007-114> Earth Sciences Publication - Article PeerReviewed 2008 ftnerc https://doi.org/10.1144/0016-76492007-114 2024-05-15T08:46:53Z The lithospheric structure of the Falkland Plateau region has been modelled by making an initial estimate on the basis of local isostasy and then refining the geometries by inversion of gravity anomalies. The model predicts a crustal thickness beneath the Falkland Plateau Basin that is more than twice that previously inferred from seismic evidence. The preferred explanation is that the seismic survey detected high-velocity (?underplated) lower crust rather than upper mantle. This is compatible with the results of deep seismic experiments over the conjugate Filchner Block of Antarctica and also appears likely on the basis of the position of the Falkland Plateau Basin in relation to the Karoo–Ferrar magmatic province at the time of extension. Continental crust is inferred to be continuous beneath the northern part of the Falkland Plateau, as there are consistent magnetic and flexural anomalies associated with the continent-ocean boundary. Flexural modelling of the southern margin of the plateau indicates lateral variations in strength, with the strongest lithosphere beneath the Falkland Plateau Basin. This may indicate thick oceanic crust beneath the southern part of the basin or the effect of thinning relatively weak continental crust and replacing it with relatively strong underplating. Article in Journal/Newspaper Antarc* Antarctica Natural Environment Research Council: NERC Open Research Archive Falkland Plateau ENVELOPE(-50.000,-50.000,-51.000,-51.000) Journal of the Geological Society 165 4 795 806 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
topic |
Earth Sciences |
spellingShingle |
Earth Sciences Kimbell, Geoffrey Richards, Philip The three-dimensional lithospheric structure of the Falkland Plateau region based on gravity modelling |
topic_facet |
Earth Sciences |
description |
The lithospheric structure of the Falkland Plateau region has been modelled by making an initial estimate on the basis of local isostasy and then refining the geometries by inversion of gravity anomalies. The model predicts a crustal thickness beneath the Falkland Plateau Basin that is more than twice that previously inferred from seismic evidence. The preferred explanation is that the seismic survey detected high-velocity (?underplated) lower crust rather than upper mantle. This is compatible with the results of deep seismic experiments over the conjugate Filchner Block of Antarctica and also appears likely on the basis of the position of the Falkland Plateau Basin in relation to the Karoo–Ferrar magmatic province at the time of extension. Continental crust is inferred to be continuous beneath the northern part of the Falkland Plateau, as there are consistent magnetic and flexural anomalies associated with the continent-ocean boundary. Flexural modelling of the southern margin of the plateau indicates lateral variations in strength, with the strongest lithosphere beneath the Falkland Plateau Basin. This may indicate thick oceanic crust beneath the southern part of the basin or the effect of thinning relatively weak continental crust and replacing it with relatively strong underplating. |
format |
Article in Journal/Newspaper |
author |
Kimbell, Geoffrey Richards, Philip |
author_facet |
Kimbell, Geoffrey Richards, Philip |
author_sort |
Kimbell, Geoffrey |
title |
The three-dimensional lithospheric structure of the Falkland Plateau region based on gravity modelling |
title_short |
The three-dimensional lithospheric structure of the Falkland Plateau region based on gravity modelling |
title_full |
The three-dimensional lithospheric structure of the Falkland Plateau region based on gravity modelling |
title_fullStr |
The three-dimensional lithospheric structure of the Falkland Plateau region based on gravity modelling |
title_full_unstemmed |
The three-dimensional lithospheric structure of the Falkland Plateau region based on gravity modelling |
title_sort |
three-dimensional lithospheric structure of the falkland plateau region based on gravity modelling |
publisher |
Geological Society of London |
publishDate |
2008 |
url |
http://nora.nerc.ac.uk/id/eprint/3784/ https://nora.nerc.ac.uk/id/eprint/3784/1/falklands_3dmod_paper.pdf http://jgs.geoscienceworld.org/content/vol165/issue4/ |
long_lat |
ENVELOPE(-50.000,-50.000,-51.000,-51.000) |
geographic |
Falkland Plateau |
geographic_facet |
Falkland Plateau |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
https://nora.nerc.ac.uk/id/eprint/3784/1/falklands_3dmod_paper.pdf Kimbell, Geoffrey; Richards, Philip. 2008 The three-dimensional lithospheric structure of the Falkland Plateau region based on gravity modelling. Journal of the Geological Society, 165 (4). 795-806. https://doi.org/10.1144/0016-76492007-114 <https://doi.org/10.1144/0016-76492007-114> |
op_doi |
https://doi.org/10.1144/0016-76492007-114 |
container_title |
Journal of the Geological Society |
container_volume |
165 |
container_issue |
4 |
container_start_page |
795 |
op_container_end_page |
806 |
_version_ |
1801369120324714496 |