Volcanic passive continental margin beneath Maitri station in central DML, East Antarctica: constraints from crustal shear velocity through receiver function modelling
Dronning Maud Land (DML) in East Antarctica is considered to be a key area for the reconstruction of the Gondwana supercontinent. We investigate the crustal shear wave velocity (Vs) model beneath the Maitri station, situated in the central DML of East Antarctica, through receiver function modelling....
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Norwegian Polar Institute
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ftjpolarres:oai:journals.openacademia.net:article/2653 2023-05-15T14:01:21+02:00 Volcanic passive continental margin beneath Maitri station in central DML, East Antarctica: constraints from crustal shear velocity through receiver function modelling Gupta, Sandeep Kanna, Nagaraju Akilan, A. 2017-06-28 application/pdf application/xml https://polarresearch.net/index.php/polar/article/view/2653 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/2653/6056 https://polarresearch.net/index.php/polar/article/view/2653/6057 https://polarresearch.net/index.php/polar/article/view/2653 Polar Research; Vol 36 (2017) 1751-8369 Crustal shear velocity volcanic passive margin Maitri station Dronning Maud Land underplated lower crust neighbourhood algorithm ABBREVIATIONS info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2017 ftjpolarres 2021-11-11T19:13:09Z Dronning Maud Land (DML) in East Antarctica is considered to be a key area for the reconstruction of the Gondwana supercontinent. We investigate the crustal shear wave velocity (Vs) model beneath the Maitri station, situated in the central DML of East Antarctica, through receiver function modelling. The analysis shows an average crustal thickness of 38.50 ± 0.5 km and a Vp/Vs ratio of 1.784 ± 0.002. The obtained Vs structure suggests that the topmost ca. 2.5 km of the crust contains ice and sediments with low Vs (1.5–2.0 km/s). This layer is underlain by a thick (ca. 12.5 km) layer of Vs = 2.25–2.6 km/s, suggestive of an extrusive igneous rock (rhyolite) at this depth range. Between 16 and 28 km depth, the Vs increases from 2.9 to 3.4 km/s. In the lower crust, a 7 km thick layer of Vs = 3.9 km/s is followed by 6 km thick underplated layer (Vs = 4.1 km/s) at the crust–mantle boundary. The uppermost mantle Vs is ca. 4.3 km/s. With the observation of underplated material in the lowermost crust, extrusive volcanic rocks in the upper crust, seaward dipping reflectors in the surrounding and a general paucity of seismicity, we believe the crust beneath the Maitri station represents a volcanic passive continental margin. We also believe that after its origin in the Precambrian and during its subsequent evolution it might have been affected by the post-Precambrian tectono-thermal event(s) responsible for the Gondwana supercontinent break-up. Article in Journal/Newspaper Antarc* Antarctica DML Dronning Maud Land East Antarctica Polar Research Polar Research (E-Journal) East Antarctica Dronning Maud Land Maitri ENVELOPE(11.733,11.733,-70.764,-70.764) Maitri Station ENVELOPE(11.727,11.727,-70.766,-70.766) |
institution |
Open Polar |
collection |
Polar Research (E-Journal) |
op_collection_id |
ftjpolarres |
language |
English |
topic |
Crustal shear velocity volcanic passive margin Maitri station Dronning Maud Land underplated lower crust neighbourhood algorithm ABBREVIATIONS |
spellingShingle |
Crustal shear velocity volcanic passive margin Maitri station Dronning Maud Land underplated lower crust neighbourhood algorithm ABBREVIATIONS Gupta, Sandeep Kanna, Nagaraju Akilan, A. Volcanic passive continental margin beneath Maitri station in central DML, East Antarctica: constraints from crustal shear velocity through receiver function modelling |
topic_facet |
Crustal shear velocity volcanic passive margin Maitri station Dronning Maud Land underplated lower crust neighbourhood algorithm ABBREVIATIONS |
description |
Dronning Maud Land (DML) in East Antarctica is considered to be a key area for the reconstruction of the Gondwana supercontinent. We investigate the crustal shear wave velocity (Vs) model beneath the Maitri station, situated in the central DML of East Antarctica, through receiver function modelling. The analysis shows an average crustal thickness of 38.50 ± 0.5 km and a Vp/Vs ratio of 1.784 ± 0.002. The obtained Vs structure suggests that the topmost ca. 2.5 km of the crust contains ice and sediments with low Vs (1.5–2.0 km/s). This layer is underlain by a thick (ca. 12.5 km) layer of Vs = 2.25–2.6 km/s, suggestive of an extrusive igneous rock (rhyolite) at this depth range. Between 16 and 28 km depth, the Vs increases from 2.9 to 3.4 km/s. In the lower crust, a 7 km thick layer of Vs = 3.9 km/s is followed by 6 km thick underplated layer (Vs = 4.1 km/s) at the crust–mantle boundary. The uppermost mantle Vs is ca. 4.3 km/s. With the observation of underplated material in the lowermost crust, extrusive volcanic rocks in the upper crust, seaward dipping reflectors in the surrounding and a general paucity of seismicity, we believe the crust beneath the Maitri station represents a volcanic passive continental margin. We also believe that after its origin in the Precambrian and during its subsequent evolution it might have been affected by the post-Precambrian tectono-thermal event(s) responsible for the Gondwana supercontinent break-up. |
format |
Article in Journal/Newspaper |
author |
Gupta, Sandeep Kanna, Nagaraju Akilan, A. |
author_facet |
Gupta, Sandeep Kanna, Nagaraju Akilan, A. |
author_sort |
Gupta, Sandeep |
title |
Volcanic passive continental margin beneath Maitri station in central DML, East Antarctica: constraints from crustal shear velocity through receiver function modelling |
title_short |
Volcanic passive continental margin beneath Maitri station in central DML, East Antarctica: constraints from crustal shear velocity through receiver function modelling |
title_full |
Volcanic passive continental margin beneath Maitri station in central DML, East Antarctica: constraints from crustal shear velocity through receiver function modelling |
title_fullStr |
Volcanic passive continental margin beneath Maitri station in central DML, East Antarctica: constraints from crustal shear velocity through receiver function modelling |
title_full_unstemmed |
Volcanic passive continental margin beneath Maitri station in central DML, East Antarctica: constraints from crustal shear velocity through receiver function modelling |
title_sort |
volcanic passive continental margin beneath maitri station in central dml, east antarctica: constraints from crustal shear velocity through receiver function modelling |
publisher |
Norwegian Polar Institute |
publishDate |
2017 |
url |
https://polarresearch.net/index.php/polar/article/view/2653 |
long_lat |
ENVELOPE(11.733,11.733,-70.764,-70.764) ENVELOPE(11.727,11.727,-70.766,-70.766) |
geographic |
East Antarctica Dronning Maud Land Maitri Maitri Station |
geographic_facet |
East Antarctica Dronning Maud Land Maitri Maitri Station |
genre |
Antarc* Antarctica DML Dronning Maud Land East Antarctica Polar Research |
genre_facet |
Antarc* Antarctica DML Dronning Maud Land East Antarctica Polar Research |
op_source |
Polar Research; Vol 36 (2017) 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/2653/6056 https://polarresearch.net/index.php/polar/article/view/2653/6057 https://polarresearch.net/index.php/polar/article/view/2653 |
_version_ |
1766271087402811392 |