The Wilkes Land Anomaly revisited
International audience The Wilkes Land Gravity Anomaly, first reported in 1959–60, is located in northern Victoria Land in the Pacific Ocean sector of East Antarctica, 1400 km west of the Ross Sea and centred at 70°00'S-140°00'E. Initially described on the basis of ground-based seismic and...
Published in: | Antarctic Science |
---|---|
Main Authors: | , , , , , |
Other Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2015
|
Subjects: | |
Online Access: | https://insu.hal.science/insu-01204520 https://doi.org/10.1017/S0954102014000789 |
id |
ftinsu:oai:HAL:insu-01204520v1 |
---|---|
record_format |
openpolar |
spelling |
ftinsu:oai:HAL:insu-01204520v1 2024-04-28T07:59:18+00:00 The Wilkes Land Anomaly revisited Weihaupt, John G. van Der Hoeven, Frans G. Chambers, Fb Lorius, C. Wyckoff, J. Castendyk, D. University of Colorado Denver Delft University of Technology (TU Delft) Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Institute of Arctic Alpine Research University of Colorado Boulder (INSTAAR) University of Colorado Boulder 2015-06 https://insu.hal.science/insu-01204520 https://doi.org/10.1017/S0954102014000789 en eng HAL CCSD Cambridge University Press (CUP) info:eu-repo/semantics/altIdentifier/doi/10.1017/S0954102014000789 insu-01204520 https://insu.hal.science/insu-01204520 doi:10.1017/S0954102014000789 ISSN: 0954-1020 EISSN: 1365-2079 Antarctic Science https://insu.hal.science/insu-01204520 Antarctic Science, 2015, 27 (3), pp.290-304. ⟨10.1017/S0954102014000789⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2015 ftinsu https://doi.org/10.1017/S0954102014000789 2024-04-05T00:49:39Z International audience The Wilkes Land Gravity Anomaly, first reported in 1959–60, is located in northern Victoria Land in the Pacific Ocean sector of East Antarctica, 1400 km west of the Ross Sea and centred at 70°00'S-140°00'E. Initially described on the basis of ground-based seismic and gravity survey, and estimated at the time to have a diameter of 243 km, the original data are now supplemented by data from airborne radiosound survey, airborne gravity survey, airborne magnetic survey and satellite remote sensing. These new data enable us to expand upon the original data, and reveal that the structure has a diameter of some 510 km, is accompanied by ice streams and a chaotically disturbed region of the continental ice sheet, has a subglacial topographical relief of ≥1500 m, and exhibits a negative free air gravity anomaly associated with a larger central positive free air gravity anomaly. The feature has been described as a volcanic structure, an igneous intrusion, an ancient igneous diapir, a subglacial sedimentary basin, a glacially eroded subglacial valley, a tectonic feature and a meteorite impact crater. We re-examine the feature on the basis of these collective data, with emphasis on the free air gravity anomaly signs, magnitudes and patterns, magnetic signature magnitudes and patterns, and the size, shape, dimensions and morphology of the structure. This enhanced view adds substantially to the original description provided at the time of discovery, and suggests several explanations for the origin of the Wilkes Land Anomaly. However, the importance of this feature lies not only in determining its origin but by the fact that this part of the Wilkes Subglacial Basin is one of the most prominent regional negative geoid and associated gravity anomalies of the Antarctic continent. Article in Journal/Newspaper Antarc* Antarctic Antarctic Science Antarctica East Antarctica Ice Sheet Ross Sea Victoria Land Wilkes Land Institut national des sciences de l'Univers: HAL-INSU Antarctic Science 27 3 291 305 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDE]Environmental Sciences |
spellingShingle |
[SDE]Environmental Sciences Weihaupt, John G. van Der Hoeven, Frans G. Chambers, Fb Lorius, C. Wyckoff, J. Castendyk, D. The Wilkes Land Anomaly revisited |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience The Wilkes Land Gravity Anomaly, first reported in 1959–60, is located in northern Victoria Land in the Pacific Ocean sector of East Antarctica, 1400 km west of the Ross Sea and centred at 70°00'S-140°00'E. Initially described on the basis of ground-based seismic and gravity survey, and estimated at the time to have a diameter of 243 km, the original data are now supplemented by data from airborne radiosound survey, airborne gravity survey, airborne magnetic survey and satellite remote sensing. These new data enable us to expand upon the original data, and reveal that the structure has a diameter of some 510 km, is accompanied by ice streams and a chaotically disturbed region of the continental ice sheet, has a subglacial topographical relief of ≥1500 m, and exhibits a negative free air gravity anomaly associated with a larger central positive free air gravity anomaly. The feature has been described as a volcanic structure, an igneous intrusion, an ancient igneous diapir, a subglacial sedimentary basin, a glacially eroded subglacial valley, a tectonic feature and a meteorite impact crater. We re-examine the feature on the basis of these collective data, with emphasis on the free air gravity anomaly signs, magnitudes and patterns, magnetic signature magnitudes and patterns, and the size, shape, dimensions and morphology of the structure. This enhanced view adds substantially to the original description provided at the time of discovery, and suggests several explanations for the origin of the Wilkes Land Anomaly. However, the importance of this feature lies not only in determining its origin but by the fact that this part of the Wilkes Subglacial Basin is one of the most prominent regional negative geoid and associated gravity anomalies of the Antarctic continent. |
author2 |
University of Colorado Denver Delft University of Technology (TU Delft) Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Institute of Arctic Alpine Research University of Colorado Boulder (INSTAAR) University of Colorado Boulder |
format |
Article in Journal/Newspaper |
author |
Weihaupt, John G. van Der Hoeven, Frans G. Chambers, Fb Lorius, C. Wyckoff, J. Castendyk, D. |
author_facet |
Weihaupt, John G. van Der Hoeven, Frans G. Chambers, Fb Lorius, C. Wyckoff, J. Castendyk, D. |
author_sort |
Weihaupt, John G. |
title |
The Wilkes Land Anomaly revisited |
title_short |
The Wilkes Land Anomaly revisited |
title_full |
The Wilkes Land Anomaly revisited |
title_fullStr |
The Wilkes Land Anomaly revisited |
title_full_unstemmed |
The Wilkes Land Anomaly revisited |
title_sort |
wilkes land anomaly revisited |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://insu.hal.science/insu-01204520 https://doi.org/10.1017/S0954102014000789 |
genre |
Antarc* Antarctic Antarctic Science Antarctica East Antarctica Ice Sheet Ross Sea Victoria Land Wilkes Land |
genre_facet |
Antarc* Antarctic Antarctic Science Antarctica East Antarctica Ice Sheet Ross Sea Victoria Land Wilkes Land |
op_source |
ISSN: 0954-1020 EISSN: 1365-2079 Antarctic Science https://insu.hal.science/insu-01204520 Antarctic Science, 2015, 27 (3), pp.290-304. ⟨10.1017/S0954102014000789⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1017/S0954102014000789 insu-01204520 https://insu.hal.science/insu-01204520 doi:10.1017/S0954102014000789 |
op_doi |
https://doi.org/10.1017/S0954102014000789 |
container_title |
Antarctic Science |
container_volume |
27 |
container_issue |
3 |
container_start_page |
291 |
op_container_end_page |
305 |
_version_ |
1797572119247192064 |