Electrical structure beneath Schirmacher Oasis, East Antarctica: a magnetotelluric study
Maitri Station (70.76°S; 11.73°E) is located in Schirmacher Oasis, a coastal nunatak in north-central Dronning Maud Land covering an area of 35 km2. Here, we report results from the first magnetotelluric experiments and delineate the deep electrical conductivity structure under Schirmacher Oasis usi...
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ftjpolarres:oai:journals.openacademia.net:article/3086 2024-09-09T19:10:06+00:00 Electrical structure beneath Schirmacher Oasis, East Antarctica: a magnetotelluric study Murthy, D. N. Veeraswamy, K. Harinarayana, T. Singh, U.K. Santosh, M. 2013-11-20 application/pdf text/html application/epub+zip text/plain https://polarresearch.net/index.php/polar/article/view/3086 https://doi.org/10.3402/polar.v32i0.17309 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/3086/pdf_1 https://polarresearch.net/index.php/polar/article/view/3086/html https://polarresearch.net/index.php/polar/article/view/3086/7051 https://polarresearch.net/index.php/polar/article/view/3086/7052 https://polarresearch.net/index.php/polar/article/view/3086 doi:10.3402/polar.v32i0.17309 Polar Research; Vol 32 (2013) 1751-8369 Magnetotellurics Schirmacher Oasis crustal structure East Antarctica Mozambique Belt electrical conductivity info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2013 ftjpolarres https://doi.org/10.3402/polar.v32i0.17309 2024-06-20T23:33:17Z Maitri Station (70.76°S; 11.73°E) is located in Schirmacher Oasis, a coastal nunatak in north-central Dronning Maud Land covering an area of 35 km2. Here, we report results from the first magnetotelluric experiments and delineate the deep electrical conductivity structure under Schirmacher Oasis using the data acquired during the 24th Indian Antarctic Scientific Expedition. The magnetotelluric method has the advantage of shallow to deeper level coverage as the data acquisition covers a wide frequency band of 10-3103 Hz, permitting different penetration depths depending on the frequency and conductivity of the layer under investigation. The modelling results indicate the presence of a highly resistive (8000-10 000 ohm m) upper crust, which shows a lateral variation in thickness from 20 km (below site 6) in the east to 10 km (between sites 1 and 2) in the west. It is underlain by a less resistive (500-600 ohm m) lower crust. The highly resistive upper crustal structure supports the existing notion that western Dronning Maud Land is a stable, cratonic platform. Results of free-air gravity, seismic, geomagnetic and surface wave dispersion investigations in East Antarctica also indicate a cratonic-type crust. The results of our study allow us to identify a westward thinning of the upper crust with a marked boundary between sites 1 and 2. We also find evidence for the continuity of the Mozambique mobile belt in East Antarctica on the western side of Schirmacher Oasis.Keywords: Magnetotellurics; Schirmacher Oasis crustal structure; East Antarctica; Mozambique Belt; electrical conductivity(Published: 20 November 2013)Citation: Polar Research 2013, 32, 17309, http://dx.doi.org/10.3402/polar.v32i0.17309 Article in Journal/Newspaper Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica Polar Research Polar Research Antarctic East Antarctica Dronning Maud Land Indian Maitri ENVELOPE(11.733,11.733,-70.764,-70.764) Maitri Station ENVELOPE(11.727,11.727,-70.766,-70.766) Polar Research 32 1 17309 |
institution |
Open Polar |
collection |
Polar Research |
op_collection_id |
ftjpolarres |
language |
English |
topic |
Magnetotellurics Schirmacher Oasis crustal structure East Antarctica Mozambique Belt electrical conductivity |
spellingShingle |
Magnetotellurics Schirmacher Oasis crustal structure East Antarctica Mozambique Belt electrical conductivity Murthy, D. N. Veeraswamy, K. Harinarayana, T. Singh, U.K. Santosh, M. Electrical structure beneath Schirmacher Oasis, East Antarctica: a magnetotelluric study |
topic_facet |
Magnetotellurics Schirmacher Oasis crustal structure East Antarctica Mozambique Belt electrical conductivity |
description |
Maitri Station (70.76°S; 11.73°E) is located in Schirmacher Oasis, a coastal nunatak in north-central Dronning Maud Land covering an area of 35 km2. Here, we report results from the first magnetotelluric experiments and delineate the deep electrical conductivity structure under Schirmacher Oasis using the data acquired during the 24th Indian Antarctic Scientific Expedition. The magnetotelluric method has the advantage of shallow to deeper level coverage as the data acquisition covers a wide frequency band of 10-3103 Hz, permitting different penetration depths depending on the frequency and conductivity of the layer under investigation. The modelling results indicate the presence of a highly resistive (8000-10 000 ohm m) upper crust, which shows a lateral variation in thickness from 20 km (below site 6) in the east to 10 km (between sites 1 and 2) in the west. It is underlain by a less resistive (500-600 ohm m) lower crust. The highly resistive upper crustal structure supports the existing notion that western Dronning Maud Land is a stable, cratonic platform. Results of free-air gravity, seismic, geomagnetic and surface wave dispersion investigations in East Antarctica also indicate a cratonic-type crust. The results of our study allow us to identify a westward thinning of the upper crust with a marked boundary between sites 1 and 2. We also find evidence for the continuity of the Mozambique mobile belt in East Antarctica on the western side of Schirmacher Oasis.Keywords: Magnetotellurics; Schirmacher Oasis crustal structure; East Antarctica; Mozambique Belt; electrical conductivity(Published: 20 November 2013)Citation: Polar Research 2013, 32, 17309, http://dx.doi.org/10.3402/polar.v32i0.17309 |
format |
Article in Journal/Newspaper |
author |
Murthy, D. N. Veeraswamy, K. Harinarayana, T. Singh, U.K. Santosh, M. |
author_facet |
Murthy, D. N. Veeraswamy, K. Harinarayana, T. Singh, U.K. Santosh, M. |
author_sort |
Murthy, D. N. |
title |
Electrical structure beneath Schirmacher Oasis, East Antarctica: a magnetotelluric study |
title_short |
Electrical structure beneath Schirmacher Oasis, East Antarctica: a magnetotelluric study |
title_full |
Electrical structure beneath Schirmacher Oasis, East Antarctica: a magnetotelluric study |
title_fullStr |
Electrical structure beneath Schirmacher Oasis, East Antarctica: a magnetotelluric study |
title_full_unstemmed |
Electrical structure beneath Schirmacher Oasis, East Antarctica: a magnetotelluric study |
title_sort |
electrical structure beneath schirmacher oasis, east antarctica: a magnetotelluric study |
publisher |
Norwegian Polar Institute |
publishDate |
2013 |
url |
https://polarresearch.net/index.php/polar/article/view/3086 https://doi.org/10.3402/polar.v32i0.17309 |
long_lat |
ENVELOPE(11.733,11.733,-70.764,-70.764) ENVELOPE(11.727,11.727,-70.766,-70.766) |
geographic |
Antarctic East Antarctica Dronning Maud Land Indian Maitri Maitri Station |
geographic_facet |
Antarctic East Antarctica Dronning Maud Land Indian Maitri Maitri Station |
genre |
Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica Polar Research |
genre_facet |
Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica Polar Research |
op_source |
Polar Research; Vol 32 (2013) 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/3086/pdf_1 https://polarresearch.net/index.php/polar/article/view/3086/html https://polarresearch.net/index.php/polar/article/view/3086/7051 https://polarresearch.net/index.php/polar/article/view/3086/7052 https://polarresearch.net/index.php/polar/article/view/3086 doi:10.3402/polar.v32i0.17309 |
op_doi |
https://doi.org/10.3402/polar.v32i0.17309 |
container_title |
Polar Research |
container_volume |
32 |
container_issue |
1 |
container_start_page |
17309 |
_version_ |
1809824550516424704 |