Mapping tectonic provinces with airborne gravity and radar data in Dronning Maud Land, East Antarctica
Antarctica represents a key component in the investigation of the geological history and reconstruction of the supercontinents Rodinia and Gondwana. Remnants of the formation and disintegration of these ancient land masses can be found, although great uncertainties remain in the location of tectonic...
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fthighwire:oai:open-archive.highwire.org:gji:189/1/414 2023-05-15T13:59:18+02:00 Mapping tectonic provinces with airborne gravity and radar data in Dronning Maud Land, East Antarctica Riedel, S. Jokat, W. Steinhage, D. 2012-04-01 00:00:00.0 text/html http://gji.oxfordjournals.org/cgi/content/short/189/1/414 https://doi.org/10.1111/j.1365-246X.2012.05363.x en eng Oxford University Press http://gji.oxfordjournals.org/cgi/content/short/189/1/414 http://dx.doi.org/10.1111/j.1365-246X.2012.05363.x Copyright (C) 2012, Oxford University Press Gravity geodesy and tides TEXT 2012 fthighwire https://doi.org/10.1111/j.1365-246X.2012.05363.x 2015-02-28T17:33:51Z Antarctica represents a key component in the investigation of the geological history and reconstruction of the supercontinents Rodinia and Gondwana. Remnants of the formation and disintegration of these ancient land masses can be found, although great uncertainties remain in the location of tectonic boundaries beneath the ice sheet of Antarctica due to general lack of outcrops and the limited amount of geological data. Airborne and space measurements are the only possibility to obtain comprehensive spatial data coverage for geological studies in the remote polar areas. More than 100 000 line kilometres of airborne geophysical data, including radio echo sounding, gravity and magnetic data, were acquired over an area of 1.2 million square kilometres in the centre of Dronning Maud Land (DML) over four austral summer campaigns between 2001 and 2005. The data are presented here as compilations of homogeneous topographic and gravity data for the DML region, ranging from 14°W to 20°E and from 70°S to 78.5°S. With respect to older airborne geophysical investigations in DML, up to 85 per cent of the gravity data cover unexplored regions. Analyses of the maps of topography and gravity anomalies, by filtering and isostatic analysis, reveal information about geological and tectonic structures in DML. Different gravity maps provide hints for the general tectonic fabric of the area. For the first time the southern boundary of the continent-ocean boundary formed during the Jurassic dispersal of Gondwana is identified. Especially the mountain range in DML is most likely not in isostatic balance. The area is still uplifting as a consequence of glacial rebound. Interpretations of the Jutul-Penck Graben as failed Jurassic rift system can be confirmed by the gravity inversion. Thinned continental crust compared to the surrounding geological units strongly support this hypothesis. Besides on other interpreted anomalies, the data show a gravity structure, which starts approximately at 73.25°S/006°E and strikes in southwestern ... Text Antarc* Antarctica DML Dronning Maud Land East Antarctica Ice Sheet HighWire Press (Stanford University) Austral Dronning Maud Land East Antarctica Jutul ENVELOPE(26.337,26.337,70.677,70.677) Penck ENVELOPE(87.717,87.717,-66.700,-66.700) Geophysical Journal International 189 1 414 427 |
institution |
Open Polar |
collection |
HighWire Press (Stanford University) |
op_collection_id |
fthighwire |
language |
English |
topic |
Gravity geodesy and tides |
spellingShingle |
Gravity geodesy and tides Riedel, S. Jokat, W. Steinhage, D. Mapping tectonic provinces with airborne gravity and radar data in Dronning Maud Land, East Antarctica |
topic_facet |
Gravity geodesy and tides |
description |
Antarctica represents a key component in the investigation of the geological history and reconstruction of the supercontinents Rodinia and Gondwana. Remnants of the formation and disintegration of these ancient land masses can be found, although great uncertainties remain in the location of tectonic boundaries beneath the ice sheet of Antarctica due to general lack of outcrops and the limited amount of geological data. Airborne and space measurements are the only possibility to obtain comprehensive spatial data coverage for geological studies in the remote polar areas. More than 100 000 line kilometres of airborne geophysical data, including radio echo sounding, gravity and magnetic data, were acquired over an area of 1.2 million square kilometres in the centre of Dronning Maud Land (DML) over four austral summer campaigns between 2001 and 2005. The data are presented here as compilations of homogeneous topographic and gravity data for the DML region, ranging from 14°W to 20°E and from 70°S to 78.5°S. With respect to older airborne geophysical investigations in DML, up to 85 per cent of the gravity data cover unexplored regions. Analyses of the maps of topography and gravity anomalies, by filtering and isostatic analysis, reveal information about geological and tectonic structures in DML. Different gravity maps provide hints for the general tectonic fabric of the area. For the first time the southern boundary of the continent-ocean boundary formed during the Jurassic dispersal of Gondwana is identified. Especially the mountain range in DML is most likely not in isostatic balance. The area is still uplifting as a consequence of glacial rebound. Interpretations of the Jutul-Penck Graben as failed Jurassic rift system can be confirmed by the gravity inversion. Thinned continental crust compared to the surrounding geological units strongly support this hypothesis. Besides on other interpreted anomalies, the data show a gravity structure, which starts approximately at 73.25°S/006°E and strikes in southwestern ... |
format |
Text |
author |
Riedel, S. Jokat, W. Steinhage, D. |
author_facet |
Riedel, S. Jokat, W. Steinhage, D. |
author_sort |
Riedel, S. |
title |
Mapping tectonic provinces with airborne gravity and radar data in Dronning Maud Land, East Antarctica |
title_short |
Mapping tectonic provinces with airborne gravity and radar data in Dronning Maud Land, East Antarctica |
title_full |
Mapping tectonic provinces with airborne gravity and radar data in Dronning Maud Land, East Antarctica |
title_fullStr |
Mapping tectonic provinces with airborne gravity and radar data in Dronning Maud Land, East Antarctica |
title_full_unstemmed |
Mapping tectonic provinces with airborne gravity and radar data in Dronning Maud Land, East Antarctica |
title_sort |
mapping tectonic provinces with airborne gravity and radar data in dronning maud land, east antarctica |
publisher |
Oxford University Press |
publishDate |
2012 |
url |
http://gji.oxfordjournals.org/cgi/content/short/189/1/414 https://doi.org/10.1111/j.1365-246X.2012.05363.x |
long_lat |
ENVELOPE(26.337,26.337,70.677,70.677) ENVELOPE(87.717,87.717,-66.700,-66.700) |
geographic |
Austral Dronning Maud Land East Antarctica Jutul Penck |
geographic_facet |
Austral Dronning Maud Land East Antarctica Jutul Penck |
genre |
Antarc* Antarctica DML Dronning Maud Land East Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctica DML Dronning Maud Land East Antarctica Ice Sheet |
op_relation |
http://gji.oxfordjournals.org/cgi/content/short/189/1/414 http://dx.doi.org/10.1111/j.1365-246X.2012.05363.x |
op_rights |
Copyright (C) 2012, Oxford University Press |
op_doi |
https://doi.org/10.1111/j.1365-246X.2012.05363.x |
container_title |
Geophysical Journal International |
container_volume |
189 |
container_issue |
1 |
container_start_page |
414 |
op_container_end_page |
427 |
_version_ |
1766267847340720128 |