Recent extension driven by mantle upwelling beneath the Admiralty Mountains (East Antarctica)
Northern Victoria Land is located at the boundary between an extended, presumably hot, region (West Antarctic Rift System) and the thick, possibly cold, East Antarctic craton. The style and timing of Tertiary deformation along with relationships with the magmatic activity are still unclear, and cont...
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Online Access: | http://hdl.handle.net/11590/145628 https://doi.org/10.1029/2007TC002197 |
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ftunivroma3iris:oai:iris.uniroma3.it:11590/145628 2024-02-27T08:34:18+00:00 Recent extension driven by mantle upwelling beneath the Admiralty Mountains (East Antarctica) FACCENNA, C T. BECKER S. DANESI AND A. MORELLI ROSSETTI, FEDERICO Faccenna, C Rossetti, Federico T., Becker S., Danesi AND A., Morelli 2008 http://hdl.handle.net/11590/145628 https://doi.org/10.1029/2007TC002197 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000258826000002 journal:TECTONICS http://hdl.handle.net/11590/145628 doi:10.1029/2007TC002197 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-55949133473 info:eu-repo/semantics/article 2008 ftunivroma3iris https://doi.org/10.1029/2007TC002197 2024-01-31T17:36:10Z Northern Victoria Land is located at the boundary between an extended, presumably hot, region (West Antarctic Rift System) and the thick, possibly cold, East Antarctic craton. The style and timing of Tertiary deformation along with relationships with the magmatic activity are still unclear, and contrasting models have been proposed. We performed structural and morphotectonic analyses at the NE termination of northern Victoria Land in the Admiralty Mountains area, where the relationship between topography, tectonics, and magmatism is expected to be well pronounced. We found evidence of two subsequent episodes of faulting, occurring concurrently with the Neogene McMurdo volcanism. The first episode is associated with dextral transtension, and it is overprinted by extensional tectonics during the emplacement of large shield alkaline volcanoes. Upper mantle seismic tomography shows that the extensional regime is limited to regions overlying a low-velocity anomaly. We interpret this anomaly to be of thermal origin, and have tested the role of large-scale upwelling on lithosphere deformation in the area. The results of this integrated analysis suggest that the morphotectonic setting of the region and the magmatism is likely the result of upwelling flow at the boundary between the cold cratonic and the hot stretched province (WARS), at work until recent time in this portion of the northern Victoria Land. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Victoria Land Anagrafe della Ricerca d'Ateneo (Universitá degli studi Roma Tre) Admiralty Mountains ENVELOPE(168.762,168.762,-71.788,-71.788) Antarctic East Antarctica Victoria Land Tectonics 27 4 n/a n/a |
institution |
Open Polar |
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Anagrafe della Ricerca d'Ateneo (Universitá degli studi Roma Tre) |
op_collection_id |
ftunivroma3iris |
language |
English |
description |
Northern Victoria Land is located at the boundary between an extended, presumably hot, region (West Antarctic Rift System) and the thick, possibly cold, East Antarctic craton. The style and timing of Tertiary deformation along with relationships with the magmatic activity are still unclear, and contrasting models have been proposed. We performed structural and morphotectonic analyses at the NE termination of northern Victoria Land in the Admiralty Mountains area, where the relationship between topography, tectonics, and magmatism is expected to be well pronounced. We found evidence of two subsequent episodes of faulting, occurring concurrently with the Neogene McMurdo volcanism. The first episode is associated with dextral transtension, and it is overprinted by extensional tectonics during the emplacement of large shield alkaline volcanoes. Upper mantle seismic tomography shows that the extensional regime is limited to regions overlying a low-velocity anomaly. We interpret this anomaly to be of thermal origin, and have tested the role of large-scale upwelling on lithosphere deformation in the area. The results of this integrated analysis suggest that the morphotectonic setting of the region and the magmatism is likely the result of upwelling flow at the boundary between the cold cratonic and the hot stretched province (WARS), at work until recent time in this portion of the northern Victoria Land. |
author2 |
Faccenna, C Rossetti, Federico T., Becker S., Danesi AND A., Morelli |
format |
Article in Journal/Newspaper |
author |
FACCENNA, C T. BECKER S. DANESI AND A. MORELLI ROSSETTI, FEDERICO |
spellingShingle |
FACCENNA, C T. BECKER S. DANESI AND A. MORELLI ROSSETTI, FEDERICO Recent extension driven by mantle upwelling beneath the Admiralty Mountains (East Antarctica) |
author_facet |
FACCENNA, C T. BECKER S. DANESI AND A. MORELLI ROSSETTI, FEDERICO |
author_sort |
FACCENNA, C |
title |
Recent extension driven by mantle upwelling beneath the Admiralty Mountains (East Antarctica) |
title_short |
Recent extension driven by mantle upwelling beneath the Admiralty Mountains (East Antarctica) |
title_full |
Recent extension driven by mantle upwelling beneath the Admiralty Mountains (East Antarctica) |
title_fullStr |
Recent extension driven by mantle upwelling beneath the Admiralty Mountains (East Antarctica) |
title_full_unstemmed |
Recent extension driven by mantle upwelling beneath the Admiralty Mountains (East Antarctica) |
title_sort |
recent extension driven by mantle upwelling beneath the admiralty mountains (east antarctica) |
publishDate |
2008 |
url |
http://hdl.handle.net/11590/145628 https://doi.org/10.1029/2007TC002197 |
long_lat |
ENVELOPE(168.762,168.762,-71.788,-71.788) |
geographic |
Admiralty Mountains Antarctic East Antarctica Victoria Land |
geographic_facet |
Admiralty Mountains Antarctic East Antarctica Victoria Land |
genre |
Antarc* Antarctic Antarctica East Antarctica Victoria Land |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Victoria Land |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000258826000002 journal:TECTONICS http://hdl.handle.net/11590/145628 doi:10.1029/2007TC002197 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-55949133473 |
op_doi |
https://doi.org/10.1029/2007TC002197 |
container_title |
Tectonics |
container_volume |
27 |
container_issue |
4 |
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n/a |
op_container_end_page |
n/a |
_version_ |
1792054001422827520 |