An assessment of the gravity signature of the Windmill Islands, East Antarctica
Abstract A gravity survey was conducted on the Windmill Islands, East Antarctica, during the 2004–05 summer season. The aim of the study was to investigate the subsurface geology of the Windmill Islands area. Ninety-seven gravity stations were established. Additionally, 49 observations from a survey...
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crcambridgeupr:10.1017/s0954102015000565 2024-03-03T08:37:13+00:00 An assessment of the gravity signature of the Windmill Islands, East Antarctica Bailey, Brad T. Morgan, Peter J. Lackie, Mark A. 2016 http://dx.doi.org/10.1017/s0954102015000565 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102015000565 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 28, issue 2, page 115-126 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2016 crcambridgeupr https://doi.org/10.1017/s0954102015000565 2024-02-08T08:39:49Z Abstract A gravity survey was conducted on the Windmill Islands, East Antarctica, during the 2004–05 summer season. The aim of the study was to investigate the subsurface geology of the Windmill Islands area. Ninety-seven gravity stations were established. Additionally, 49 observations from a survey in 1993–94 were re-reduced and merged with the 2004–05 data. A three-dimensional subsurface model was constructed from the merged gravity dataset to determine the subsurface geology of the Windmill Islands. The main country rock in the Windmill Islands is a Garnet-bearing Granite Gneiss. A relatively dense intrusive charnockite unit, the Ardery Charnockite, generates the dominant gravity high of the study area and has been modelled to extend to depths of 7–13 km. It has moderate to steep contacts against the surrounding Garnet-bearing Granite Gneiss. The Ardery Charnockite surrounds a less dense granite pluton, the Ford Granite, which is modelled to a depth of 6–12 km and creates a localized gravity low. This granitic pluton extends at depth towards the east. The modelling process has also shown that Mitchell Peninsula is linked to the adjacent Law Dome ice cap by an ‘ice ramp’ of approximately 100 m thickness. Article in Journal/Newspaper Antarc* Antarctic Science Antarctica East Antarctica Ice cap Windmill Islands Cambridge University Press East Antarctica Windmill Islands ENVELOPE(110.417,110.417,-66.350,-66.350) Law Dome ENVELOPE(112.833,112.833,-66.733,-66.733) Mitchell Peninsula ENVELOPE(110.548,110.548,-66.328,-66.328) Antarctic Science 28 2 115 126 |
institution |
Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Geology Ecology, Evolution, Behavior and Systematics Oceanography Bailey, Brad T. Morgan, Peter J. Lackie, Mark A. An assessment of the gravity signature of the Windmill Islands, East Antarctica |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract A gravity survey was conducted on the Windmill Islands, East Antarctica, during the 2004–05 summer season. The aim of the study was to investigate the subsurface geology of the Windmill Islands area. Ninety-seven gravity stations were established. Additionally, 49 observations from a survey in 1993–94 were re-reduced and merged with the 2004–05 data. A three-dimensional subsurface model was constructed from the merged gravity dataset to determine the subsurface geology of the Windmill Islands. The main country rock in the Windmill Islands is a Garnet-bearing Granite Gneiss. A relatively dense intrusive charnockite unit, the Ardery Charnockite, generates the dominant gravity high of the study area and has been modelled to extend to depths of 7–13 km. It has moderate to steep contacts against the surrounding Garnet-bearing Granite Gneiss. The Ardery Charnockite surrounds a less dense granite pluton, the Ford Granite, which is modelled to a depth of 6–12 km and creates a localized gravity low. This granitic pluton extends at depth towards the east. The modelling process has also shown that Mitchell Peninsula is linked to the adjacent Law Dome ice cap by an ‘ice ramp’ of approximately 100 m thickness. |
format |
Article in Journal/Newspaper |
author |
Bailey, Brad T. Morgan, Peter J. Lackie, Mark A. |
author_facet |
Bailey, Brad T. Morgan, Peter J. Lackie, Mark A. |
author_sort |
Bailey, Brad T. |
title |
An assessment of the gravity signature of the Windmill Islands, East Antarctica |
title_short |
An assessment of the gravity signature of the Windmill Islands, East Antarctica |
title_full |
An assessment of the gravity signature of the Windmill Islands, East Antarctica |
title_fullStr |
An assessment of the gravity signature of the Windmill Islands, East Antarctica |
title_full_unstemmed |
An assessment of the gravity signature of the Windmill Islands, East Antarctica |
title_sort |
assessment of the gravity signature of the windmill islands, east antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
2016 |
url |
http://dx.doi.org/10.1017/s0954102015000565 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102015000565 |
long_lat |
ENVELOPE(110.417,110.417,-66.350,-66.350) ENVELOPE(112.833,112.833,-66.733,-66.733) ENVELOPE(110.548,110.548,-66.328,-66.328) |
geographic |
East Antarctica Windmill Islands Law Dome Mitchell Peninsula |
geographic_facet |
East Antarctica Windmill Islands Law Dome Mitchell Peninsula |
genre |
Antarc* Antarctic Science Antarctica East Antarctica Ice cap Windmill Islands |
genre_facet |
Antarc* Antarctic Science Antarctica East Antarctica Ice cap Windmill Islands |
op_source |
Antarctic Science volume 28, issue 2, page 115-126 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102015000565 |
container_title |
Antarctic Science |
container_volume |
28 |
container_issue |
2 |
container_start_page |
115 |
op_container_end_page |
126 |
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1792497594293813248 |