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
2017
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ftdoajarticles:oai:doaj.org/article:aed6f069d5c542888e0e9cf33f222203 2023-05-15T13:54:08+02:00 Volcanic passive continental margin beneath Maitri station in central DML, East Antarctica: constraints from crustal shear velocity through receiver function modelling Sandeep Gupta Nagaraju Kanna A. Akilan 2017-01-01T00:00:00Z https://doi.org/10.1080/17518369.2017.1332947 https://doaj.org/article/aed6f069d5c542888e0e9cf33f222203 EN eng Norwegian Polar Institute http://dx.doi.org/10.1080/17518369.2017.1332947 https://doaj.org/toc/1751-8369 1751-8369 doi:10.1080/17518369.2017.1332947 https://doaj.org/article/aed6f069d5c542888e0e9cf33f222203 Polar Research, Vol 36, Iss 1 (2017) Crustal shear velocity volcanic passive margin Maitri station Dronning Maud Land underplated lower crust neighbourhood algorithm Environmental sciences GE1-350 Oceanography GC1-1581 article 2017 ftdoajarticles https://doi.org/10.1080/17518369.2017.1332947 2022-12-31T08:52:52Z 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 Directory of Open Access Journals: DOAJ Articles 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) Polar Research 36 1 1332947 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Crustal shear velocity volcanic passive margin Maitri station Dronning Maud Land underplated lower crust neighbourhood algorithm Environmental sciences GE1-350 Oceanography GC1-1581 |
spellingShingle |
Crustal shear velocity volcanic passive margin Maitri station Dronning Maud Land underplated lower crust neighbourhood algorithm Environmental sciences GE1-350 Oceanography GC1-1581 Sandeep Gupta Nagaraju Kanna A. Akilan 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 Environmental sciences GE1-350 Oceanography GC1-1581 |
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 |
Sandeep Gupta Nagaraju Kanna A. Akilan |
author_facet |
Sandeep Gupta Nagaraju Kanna A. Akilan |
author_sort |
Sandeep Gupta |
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://doi.org/10.1080/17518369.2017.1332947 https://doaj.org/article/aed6f069d5c542888e0e9cf33f222203 |
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, Iss 1 (2017) |
op_relation |
http://dx.doi.org/10.1080/17518369.2017.1332947 https://doaj.org/toc/1751-8369 1751-8369 doi:10.1080/17518369.2017.1332947 https://doaj.org/article/aed6f069d5c542888e0e9cf33f222203 |
op_doi |
https://doi.org/10.1080/17518369.2017.1332947 |
container_title |
Polar Research |
container_volume |
36 |
container_issue |
1 |
container_start_page |
1332947 |
_version_ |
1766259776194347008 |