Temperature, lithosphere-asthenosphere boundary, and heat flux beneath the Antarctic Plate inferred from seismic velocities
International audience We estimate the upper-mantle temperature of the Antarctic Plate based on the thermoelastic properties of mantle minerals and S velocities using a new 3-D shear velocity model, AN1-S [An et al., 2015, JGR]. Crustal temperatures and surface heat fluxes are then calculated from t...
Published in: | Journal of Geophysical Research: Solid Earth |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | https://hal.archives-ouvertes.fr/hal-01239984 https://hal.archives-ouvertes.fr/hal-01239984/document https://hal.archives-ouvertes.fr/hal-01239984/file/2015JB011917.pdf https://doi.org/10.1002/2015JB011917 |
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ftccsdartic:oai:HAL:hal-01239984v1 2023-05-15T13:53:35+02:00 Temperature, lithosphere-asthenosphere boundary, and heat flux beneath the Antarctic Plate inferred from seismic velocities An, Meijan Wiens, Douglas Zhao, Yue Feng, Mei Nyblade, Andrew Kanao, Masaki Li, Yuansheng Maggi, Alessia Lévêque, Jean-Jacques National Institute of Polar Research Tokyo (NiPR) Institut de physique du globe de Strasbourg (IPGS) Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) ANR-07-BLAN-0147,CASE-IPY,Concordia Antarctic Seismic Experiment (International Polar Year)(2007) 2015-12 https://hal.archives-ouvertes.fr/hal-01239984 https://hal.archives-ouvertes.fr/hal-01239984/document https://hal.archives-ouvertes.fr/hal-01239984/file/2015JB011917.pdf https://doi.org/10.1002/2015JB011917 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1002/2015JB011917 hal-01239984 https://hal.archives-ouvertes.fr/hal-01239984 https://hal.archives-ouvertes.fr/hal-01239984/document https://hal.archives-ouvertes.fr/hal-01239984/file/2015JB011917.pdf doi:10.1002/2015JB011917 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.archives-ouvertes.fr/hal-01239984 Journal of Geophysical Research, American Geophysical Union, 2015, ⟨10.1002/2015JB011917⟩ [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2015 ftccsdartic https://doi.org/10.1002/2015JB011917 2021-10-23T22:25:15Z International audience We estimate the upper-mantle temperature of the Antarctic Plate based on the thermoelastic properties of mantle minerals and S velocities using a new 3-D shear velocity model, AN1-S [An et al., 2015, JGR]. Crustal temperatures and surface heat fluxes are then calculated from the upper-mantle temperature assuming steady-state thermal conduction. The temperature at the top of the asthenosphere beneath the oceanic region and West Antarctica is higher than the dry mantle solidus, indicating the presence of melt. From the temperature values, we generate depth maps of the lithosphere–asthenosphere boundary and the Curie-temperature isotherm. The maps show that East Antarctica has a thick lithosphere similar to that of other stable cratons, with the thickest lithosphere (~250 km) between Domes A and C. The thin crust and lithosphere beneath West Antarctica are similar to those of modern subduction-related rift systems in East Asia. A cold region beneath the Antarctic Peninsula is similar in spatial extent to that of a flat-subducted slab beneath the southern Andes, indicating a possible remnant of the Phoenix Plate, which was subducted prior to 10 Ma. The oceanic lithosphere generally thickens with increasing age, and the age–thickness correlation depends on the spreading rate of the ridge that formed the lithosphere. Significant flattening of the age–thickness curves is not observed for the mature oceanic lithosphere of the Antarctic Plate. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica West Antarctica Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Antarctic Peninsula East Antarctica The Antarctic West Antarctica Journal of Geophysical Research: Solid Earth 120 12 8720 8742 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
spellingShingle |
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] An, Meijan Wiens, Douglas Zhao, Yue Feng, Mei Nyblade, Andrew Kanao, Masaki Li, Yuansheng Maggi, Alessia Lévêque, Jean-Jacques Temperature, lithosphere-asthenosphere boundary, and heat flux beneath the Antarctic Plate inferred from seismic velocities |
topic_facet |
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
description |
International audience We estimate the upper-mantle temperature of the Antarctic Plate based on the thermoelastic properties of mantle minerals and S velocities using a new 3-D shear velocity model, AN1-S [An et al., 2015, JGR]. Crustal temperatures and surface heat fluxes are then calculated from the upper-mantle temperature assuming steady-state thermal conduction. The temperature at the top of the asthenosphere beneath the oceanic region and West Antarctica is higher than the dry mantle solidus, indicating the presence of melt. From the temperature values, we generate depth maps of the lithosphere–asthenosphere boundary and the Curie-temperature isotherm. The maps show that East Antarctica has a thick lithosphere similar to that of other stable cratons, with the thickest lithosphere (~250 km) between Domes A and C. The thin crust and lithosphere beneath West Antarctica are similar to those of modern subduction-related rift systems in East Asia. A cold region beneath the Antarctic Peninsula is similar in spatial extent to that of a flat-subducted slab beneath the southern Andes, indicating a possible remnant of the Phoenix Plate, which was subducted prior to 10 Ma. The oceanic lithosphere generally thickens with increasing age, and the age–thickness correlation depends on the spreading rate of the ridge that formed the lithosphere. Significant flattening of the age–thickness curves is not observed for the mature oceanic lithosphere of the Antarctic Plate. |
author2 |
National Institute of Polar Research Tokyo (NiPR) Institut de physique du globe de Strasbourg (IPGS) Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) ANR-07-BLAN-0147,CASE-IPY,Concordia Antarctic Seismic Experiment (International Polar Year)(2007) |
format |
Article in Journal/Newspaper |
author |
An, Meijan Wiens, Douglas Zhao, Yue Feng, Mei Nyblade, Andrew Kanao, Masaki Li, Yuansheng Maggi, Alessia Lévêque, Jean-Jacques |
author_facet |
An, Meijan Wiens, Douglas Zhao, Yue Feng, Mei Nyblade, Andrew Kanao, Masaki Li, Yuansheng Maggi, Alessia Lévêque, Jean-Jacques |
author_sort |
An, Meijan |
title |
Temperature, lithosphere-asthenosphere boundary, and heat flux beneath the Antarctic Plate inferred from seismic velocities |
title_short |
Temperature, lithosphere-asthenosphere boundary, and heat flux beneath the Antarctic Plate inferred from seismic velocities |
title_full |
Temperature, lithosphere-asthenosphere boundary, and heat flux beneath the Antarctic Plate inferred from seismic velocities |
title_fullStr |
Temperature, lithosphere-asthenosphere boundary, and heat flux beneath the Antarctic Plate inferred from seismic velocities |
title_full_unstemmed |
Temperature, lithosphere-asthenosphere boundary, and heat flux beneath the Antarctic Plate inferred from seismic velocities |
title_sort |
temperature, lithosphere-asthenosphere boundary, and heat flux beneath the antarctic plate inferred from seismic velocities |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal.archives-ouvertes.fr/hal-01239984 https://hal.archives-ouvertes.fr/hal-01239984/document https://hal.archives-ouvertes.fr/hal-01239984/file/2015JB011917.pdf https://doi.org/10.1002/2015JB011917 |
geographic |
Antarctic Antarctic Peninsula East Antarctica The Antarctic West Antarctica |
geographic_facet |
Antarctic Antarctic Peninsula East Antarctica The Antarctic West Antarctica |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica West Antarctica |
op_source |
ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.archives-ouvertes.fr/hal-01239984 Journal of Geophysical Research, American Geophysical Union, 2015, ⟨10.1002/2015JB011917⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2015JB011917 hal-01239984 https://hal.archives-ouvertes.fr/hal-01239984 https://hal.archives-ouvertes.fr/hal-01239984/document https://hal.archives-ouvertes.fr/hal-01239984/file/2015JB011917.pdf doi:10.1002/2015JB011917 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2015JB011917 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
120 |
container_issue |
12 |
container_start_page |
8720 |
op_container_end_page |
8742 |
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1766258788281614336 |