Interpretation of aeromagnetic data from the Ellsworth Mountains-Thiel Mountains ridge, West Antarctica
Over 12000 km of new aeromagnetic data, gathered during periods free from auroral disturbances, are presented for an area of 290 000 km2 in West Antarctica, including the majority of the Ellsworth-Whitmore Mountain crustal block. Selection of an appropriate line spacing (20 km) and rigorous diurnal...
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Geological Society of London
1988
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Online Access: | http://nora.nerc.ac.uk/id/eprint/521628/ https://doi.org/10.1144/gsjgs.145.6.1009 |
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ftnerc:oai:nora.nerc.ac.uk:521628 2023-05-15T13:41:42+02:00 Interpretation of aeromagnetic data from the Ellsworth Mountains-Thiel Mountains ridge, West Antarctica Garrett, S.W. Maslanyj, M.P. Damaske, D. 1988-11 http://nora.nerc.ac.uk/id/eprint/521628/ https://doi.org/10.1144/gsjgs.145.6.1009 unknown Geological Society of London Garrett, S.W.; Maslanyj, M.P.; Damaske, D. 1988 Interpretation of aeromagnetic data from the Ellsworth Mountains-Thiel Mountains ridge, West Antarctica. Journal of the Geological Society, 145 (6). 1009-1017. https://doi.org/10.1144/gsjgs.145.6.1009 <https://doi.org/10.1144/gsjgs.145.6.1009> Earth Sciences Publication - Article PeerReviewed 1988 ftnerc https://doi.org/10.1144/gsjgs.145.6.1009 2023-02-04T19:47:27Z Over 12000 km of new aeromagnetic data, gathered during periods free from auroral disturbances, are presented for an area of 290 000 km2 in West Antarctica, including the majority of the Ellsworth-Whitmore Mountain crustal block. Selection of an appropriate line spacing (20 km) and rigorous diurnal control allowed interpretation of isolated magnetic anomalies by two-dimensional modellìng. Anomalies of 50–500 nT amplitude extend for over 100 km, predominantly with an east-west orientation. They attain their greatest amplitudes over scattered exposures of Middle Jurassic granite, but the measured magnetizations of these rocks (J <0.1 Am−1) are insufficient to match the observed anomalies. It was necessary during modelling to invoke deeper, magnetite-rich, probably mafic plutons (J >0.5 Am−1) beneath the granites. The intrusions probably form part of a widespread bimodal igneous suite created during early stages of continental fragmentation. Article in Journal/Newspaper Antarc* Antarctica Antarctica Journal West Antarctica Natural Environment Research Council: NERC Open Research Archive West Antarctica Ellsworth Mountains ENVELOPE(-85.000,-85.000,-78.750,-78.750) Thiel Mountains ENVELOPE(-91.000,-91.000,-85.250,-85.250) Journal of the Geological Society 145 6 1009 1017 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Earth Sciences |
spellingShingle |
Earth Sciences Garrett, S.W. Maslanyj, M.P. Damaske, D. Interpretation of aeromagnetic data from the Ellsworth Mountains-Thiel Mountains ridge, West Antarctica |
topic_facet |
Earth Sciences |
description |
Over 12000 km of new aeromagnetic data, gathered during periods free from auroral disturbances, are presented for an area of 290 000 km2 in West Antarctica, including the majority of the Ellsworth-Whitmore Mountain crustal block. Selection of an appropriate line spacing (20 km) and rigorous diurnal control allowed interpretation of isolated magnetic anomalies by two-dimensional modellìng. Anomalies of 50–500 nT amplitude extend for over 100 km, predominantly with an east-west orientation. They attain their greatest amplitudes over scattered exposures of Middle Jurassic granite, but the measured magnetizations of these rocks (J <0.1 Am−1) are insufficient to match the observed anomalies. It was necessary during modelling to invoke deeper, magnetite-rich, probably mafic plutons (J >0.5 Am−1) beneath the granites. The intrusions probably form part of a widespread bimodal igneous suite created during early stages of continental fragmentation. |
format |
Article in Journal/Newspaper |
author |
Garrett, S.W. Maslanyj, M.P. Damaske, D. |
author_facet |
Garrett, S.W. Maslanyj, M.P. Damaske, D. |
author_sort |
Garrett, S.W. |
title |
Interpretation of aeromagnetic data from the Ellsworth Mountains-Thiel Mountains ridge, West Antarctica |
title_short |
Interpretation of aeromagnetic data from the Ellsworth Mountains-Thiel Mountains ridge, West Antarctica |
title_full |
Interpretation of aeromagnetic data from the Ellsworth Mountains-Thiel Mountains ridge, West Antarctica |
title_fullStr |
Interpretation of aeromagnetic data from the Ellsworth Mountains-Thiel Mountains ridge, West Antarctica |
title_full_unstemmed |
Interpretation of aeromagnetic data from the Ellsworth Mountains-Thiel Mountains ridge, West Antarctica |
title_sort |
interpretation of aeromagnetic data from the ellsworth mountains-thiel mountains ridge, west antarctica |
publisher |
Geological Society of London |
publishDate |
1988 |
url |
http://nora.nerc.ac.uk/id/eprint/521628/ https://doi.org/10.1144/gsjgs.145.6.1009 |
long_lat |
ENVELOPE(-85.000,-85.000,-78.750,-78.750) ENVELOPE(-91.000,-91.000,-85.250,-85.250) |
geographic |
West Antarctica Ellsworth Mountains Thiel Mountains |
geographic_facet |
West Antarctica Ellsworth Mountains Thiel Mountains |
genre |
Antarc* Antarctica Antarctica Journal West Antarctica |
genre_facet |
Antarc* Antarctica Antarctica Journal West Antarctica |
op_relation |
Garrett, S.W.; Maslanyj, M.P.; Damaske, D. 1988 Interpretation of aeromagnetic data from the Ellsworth Mountains-Thiel Mountains ridge, West Antarctica. Journal of the Geological Society, 145 (6). 1009-1017. https://doi.org/10.1144/gsjgs.145.6.1009 <https://doi.org/10.1144/gsjgs.145.6.1009> |
op_doi |
https://doi.org/10.1144/gsjgs.145.6.1009 |
container_title |
Journal of the Geological Society |
container_volume |
145 |
container_issue |
6 |
container_start_page |
1009 |
op_container_end_page |
1017 |
_version_ |
1766154129228431360 |