Extension and uplift 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...
Main Authors: | , , , , |
---|---|
Other Authors: | , , , , , , , |
Format: | Other/Unknown Material |
Language: | English |
Published: |
2010
|
Subjects: | |
Online Access: | http://hdl.handle.net/2122/6474 |
id |
ftingv:oai:www.earth-prints.org:2122/6474 |
---|---|
record_format |
openpolar |
spelling |
ftingv:oai:www.earth-prints.org:2122/6474 2023-05-15T14:01:36+02:00 Extension and uplift driven by mantle upwelling beneath the Admiralty Mountains (East Antarctica) Faccenna, Claudio Rossetti, Federico Thorsten, W. Becker Danesi, Stefania Morelli, Andrea Faccenna, Claudio; Università Roma Tre Rossetti, Federico; Università Roma Tre Thorsten, W. Becker; University Southern California, Los Angeles USA Danesi, Stefania; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia Morelli, Andrea; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia Università Roma Tre University Southern California, Los Angeles USA Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia 2010-05 http://hdl.handle.net/2122/6474 en eng European Geoscience Union General Assembly http://hdl.handle.net/2122/6474 open Antarctica Geodynamics 04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics Oral presentation 2010 ftingv 2022-07-29T06:05:47Z 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 by means of numerical modelling 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 result from 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 Published Vienna 3.3. Geodinamica e struttura dell'interno della Terra open Other/Unknown Material Antarc* Antarctic Antarctica East Antarctica Victoria Land Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) Antarctic East Antarctica Victoria Land Admiralty Mountains ENVELOPE(168.762,168.762,-71.788,-71.788) |
institution |
Open Polar |
collection |
Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) |
op_collection_id |
ftingv |
language |
English |
topic |
Antarctica Geodynamics 04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics |
spellingShingle |
Antarctica Geodynamics 04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics Faccenna, Claudio Rossetti, Federico Thorsten, W. Becker Danesi, Stefania Morelli, Andrea Extension and uplift driven by mantle upwelling beneath the Admiralty Mountains (East Antarctica) |
topic_facet |
Antarctica Geodynamics 04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics |
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 by means of numerical modelling 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 result from 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 Published Vienna 3.3. Geodinamica e struttura dell'interno della Terra open |
author2 |
Faccenna, Claudio; Università Roma Tre Rossetti, Federico; Università Roma Tre Thorsten, W. Becker; University Southern California, Los Angeles USA Danesi, Stefania; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia Morelli, Andrea; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia Università Roma Tre University Southern California, Los Angeles USA Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia |
format |
Other/Unknown Material |
author |
Faccenna, Claudio Rossetti, Federico Thorsten, W. Becker Danesi, Stefania Morelli, Andrea |
author_facet |
Faccenna, Claudio Rossetti, Federico Thorsten, W. Becker Danesi, Stefania Morelli, Andrea |
author_sort |
Faccenna, Claudio |
title |
Extension and uplift driven by mantle upwelling beneath the Admiralty Mountains (East Antarctica) |
title_short |
Extension and uplift driven by mantle upwelling beneath the Admiralty Mountains (East Antarctica) |
title_full |
Extension and uplift driven by mantle upwelling beneath the Admiralty Mountains (East Antarctica) |
title_fullStr |
Extension and uplift driven by mantle upwelling beneath the Admiralty Mountains (East Antarctica) |
title_full_unstemmed |
Extension and uplift driven by mantle upwelling beneath the Admiralty Mountains (East Antarctica) |
title_sort |
extension and uplift driven by mantle upwelling beneath the admiralty mountains (east antarctica) |
publishDate |
2010 |
url |
http://hdl.handle.net/2122/6474 |
long_lat |
ENVELOPE(168.762,168.762,-71.788,-71.788) |
geographic |
Antarctic East Antarctica Victoria Land Admiralty Mountains |
geographic_facet |
Antarctic East Antarctica Victoria Land Admiralty Mountains |
genre |
Antarc* Antarctic Antarctica East Antarctica Victoria Land |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Victoria Land |
op_relation |
European Geoscience Union General Assembly http://hdl.handle.net/2122/6474 |
op_rights |
open |
_version_ |
1766271549395959808 |