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...
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Norwegian Polar Institute
2013
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ftdoajarticles:oai:doaj.org/article:c7deb086e06b445b94b2597c7a6cd013 2023-05-15T13:36:53+02:00 Electrical structure beneath Schirmacher Oasis, East Antarctica: a magnetotelluric study D.N. Murthy K. Veeraswamy T. Harinarayana U.K. Singh M. Santosh 2013-11-01T00:00:00Z https://doi.org/10.3402/polar.v32i0.17309 https://doaj.org/article/c7deb086e06b445b94b2597c7a6cd013 EN eng Norwegian Polar Institute www.polarresearch.net/index.php/polar/article/download/17309/pdf_1 https://doaj.org/toc/0800-0395 https://doaj.org/toc/1751-8369 doi:10.3402/polar.v32i0.17309 0800-0395 1751-8369 https://doaj.org/article/c7deb086e06b445b94b2597c7a6cd013 Polar Research, Vol 32, Iss 0, Pp 1-15 (2013) Magnetotellurics Schirmacher Oasis crustal structure East Antarctica Mozambique Belt electrical conductivity Environmental sciences GE1-350 Oceanography GC1-1581 article 2013 ftdoajarticles https://doi.org/10.3402/polar.v32i0.17309 2022-12-31T11:56:11Z 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 10−3–103 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. Article in Journal/Newspaper Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica Polar Research Directory of Open Access Journals: DOAJ Articles 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 |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Magnetotellurics Schirmacher Oasis crustal structure East Antarctica Mozambique Belt electrical conductivity Environmental sciences GE1-350 Oceanography GC1-1581 |
spellingShingle |
Magnetotellurics Schirmacher Oasis crustal structure East Antarctica Mozambique Belt electrical conductivity Environmental sciences GE1-350 Oceanography GC1-1581 D.N. Murthy K. Veeraswamy T. Harinarayana U.K. Singh M. Santosh Electrical structure beneath Schirmacher Oasis, East Antarctica: a magnetotelluric study |
topic_facet |
Magnetotellurics Schirmacher Oasis crustal structure East Antarctica Mozambique Belt electrical conductivity Environmental sciences GE1-350 Oceanography GC1-1581 |
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 10−3–103 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. |
format |
Article in Journal/Newspaper |
author |
D.N. Murthy K. Veeraswamy T. Harinarayana U.K. Singh M. Santosh |
author_facet |
D.N. Murthy K. Veeraswamy T. Harinarayana U.K. Singh M. Santosh |
author_sort |
D.N. Murthy |
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://doi.org/10.3402/polar.v32i0.17309 https://doaj.org/article/c7deb086e06b445b94b2597c7a6cd013 |
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, Iss 0, Pp 1-15 (2013) |
op_relation |
www.polarresearch.net/index.php/polar/article/download/17309/pdf_1 https://doaj.org/toc/0800-0395 https://doaj.org/toc/1751-8369 doi:10.3402/polar.v32i0.17309 0800-0395 1751-8369 https://doaj.org/article/c7deb086e06b445b94b2597c7a6cd013 |
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_ |
1766085383924219904 |