Crustal and mantle structure beneath the Terre Adélie Craton, East Antarctica: insights from receiver function and seismic anisotropy measurements
International audience The Terre Adélie and George V Land (East Antarctica) represent key areas for understanding tectonic relationships between terranes forming the Neoarchean-Palaeoproterozoic Terre Adélie Craton (TAC) and the neighbouring lithospheric blocks, together with the nature of its bound...
Published in: | Geophysical Journal International |
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Main Authors: | , , , , |
Other Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2015
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Online Access: | https://hal.univ-reunion.fr/hal-01236105 https://hal.univ-reunion.fr/hal-01236105/document https://hal.univ-reunion.fr/hal-01236105/file/Lamarque_Arlita_SKS_RF_GJI_2015.pdf https://doi.org/10.1093/gji/ggu430 |
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ftclermontuniv:oai:HAL:hal-01236105v1 |
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Open Polar |
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HAL Clermont Auvergne (Université Blaise Pascal Clermont-Ferrand/Université d'Auvergne) |
op_collection_id |
ftclermontuniv |
language |
English |
topic |
Seismic anisotropy Cratons Continental tectonics: strike-slip and transform Crustal structure Antarctica [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
spellingShingle |
Seismic anisotropy Cratons Continental tectonics: strike-slip and transform Crustal structure Antarctica [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] Lamarque, Gaëlle Barruol, Guilhem Fontaine, Fabrice R., R. Bascou, Jerôme Ménot, René-Pierre Crustal and mantle structure beneath the Terre Adélie Craton, East Antarctica: insights from receiver function and seismic anisotropy measurements |
topic_facet |
Seismic anisotropy Cratons Continental tectonics: strike-slip and transform Crustal structure Antarctica [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
description |
International audience The Terre Adélie and George V Land (East Antarctica) represent key areas for understanding tectonic relationships between terranes forming the Neoarchean-Palaeoproterozoic Terre Adélie Craton (TAC) and the neighbouring lithospheric blocks, together with the nature of its boundary. This region that represents the eastern border of the TAC is limited on its eastern side by the Mertz shear zone (MSZ) separating more recent Palaeozoic units from the craton. The MSZ, that recorded dextral strike-slip movement at 1.7 and 1.5 Ga, is likely correlated with the Kalinjala or Coorong shear zone in South Australia, east of the Gawler Craton and may therefore represent a frozen lithospheric-scale structure. In order to investigate the litho-spheric structure of the TAC and the MSZ, we deployed from 2009 October to 2011 October four temporary seismic stations, which sampled the various lithospheric units of the TAC and of the neighbouring Palaeozoic block, together with the MSZ. We used receiver function method to deduce Moho depths and seismic anisotropy technique to infer the upper mantle deformation. Results from receiver functions analysis reveal Moho at 40–44 km depth beneath the TAC, at 36 km under the MSZ and at 28 km beneath the eastern Palaeozoic domain. The MSZ therefore delimits two crustal blocks of different thicknesses with a vertical offset of the Moho of 12 km. Seismic anisotropy deduced from SKS splitting at stations on the TAC shows fast polarisation directions () trending E–W, that is, parallel to the continental margin, and delay times (δt) ranging from 0.8 to 1.6 s. These results are similar to the splitting parameters observed at the permanent GEOSCOPE Dumont D'Urville station (DRV: 95 • N, δt 1.1 s) located in the Palaeoproterozoic domain of TAC. On the MSZ, the small number of good quality measurements limits the investigation of the deep signature of the shear zone. However, the station in the Palaeozoic domain shows trending N60 • E, which is significantly different to the ... |
author2 |
Laboratoire Magmas et Volcans (LMV) Observatoire de Physique du Globe de Clermont-Ferrand (OPGC) Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS) Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) Laboratoire GéoSciences Réunion (LGSR) Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris) |
format |
Article in Journal/Newspaper |
author |
Lamarque, Gaëlle Barruol, Guilhem Fontaine, Fabrice R., R. Bascou, Jerôme Ménot, René-Pierre |
author_facet |
Lamarque, Gaëlle Barruol, Guilhem Fontaine, Fabrice R., R. Bascou, Jerôme Ménot, René-Pierre |
author_sort |
Lamarque, Gaëlle |
title |
Crustal and mantle structure beneath the Terre Adélie Craton, East Antarctica: insights from receiver function and seismic anisotropy measurements |
title_short |
Crustal and mantle structure beneath the Terre Adélie Craton, East Antarctica: insights from receiver function and seismic anisotropy measurements |
title_full |
Crustal and mantle structure beneath the Terre Adélie Craton, East Antarctica: insights from receiver function and seismic anisotropy measurements |
title_fullStr |
Crustal and mantle structure beneath the Terre Adélie Craton, East Antarctica: insights from receiver function and seismic anisotropy measurements |
title_full_unstemmed |
Crustal and mantle structure beneath the Terre Adélie Craton, East Antarctica: insights from receiver function and seismic anisotropy measurements |
title_sort |
crustal and mantle structure beneath the terre adélie craton, east antarctica: insights from receiver function and seismic anisotropy measurements |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal.univ-reunion.fr/hal-01236105 https://hal.univ-reunion.fr/hal-01236105/document https://hal.univ-reunion.fr/hal-01236105/file/Lamarque_Arlita_SKS_RF_GJI_2015.pdf https://doi.org/10.1093/gji/ggu430 |
long_lat |
ENVELOPE(140.017,140.017,-66.667,-66.667) ENVELOPE(140.013,140.013,-66.667,-66.667) ENVELOPE(139.000,139.000,-67.000,-67.000) ENVELOPE(138.991,138.991,-59.999,-59.999) ENVELOPE(-59.517,-59.517,-62.500,-62.500) ENVELOPE(148.000,148.000,-68.500,-68.500) ENVELOPE(140.000,140.000,-66.667,-66.667) |
geographic |
East Antarctica Dumont d'Urville Dumont-d'Urville Terre Adélie Terre-Adélie Tac George V Land Dumont d'Urville Station |
geographic_facet |
East Antarctica Dumont d'Urville Dumont-d'Urville Terre Adélie Terre-Adélie Tac George V Land Dumont d'Urville Station |
genre |
Antarc* Antarctica East Antarctica George V Land |
genre_facet |
Antarc* Antarctica East Antarctica George V Land |
op_source |
ISSN: 0956-540X EISSN: 1365-246X Geophysical Journal International https://hal.univ-reunion.fr/hal-01236105 Geophysical Journal International, 2015, ⟨10.1093/gji/ggu430⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggu430 hal-01236105 https://hal.univ-reunion.fr/hal-01236105 https://hal.univ-reunion.fr/hal-01236105/document https://hal.univ-reunion.fr/hal-01236105/file/Lamarque_Arlita_SKS_RF_GJI_2015.pdf doi:10.1093/gji/ggu430 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1093/gji/ggu430 |
container_title |
Geophysical Journal International |
container_volume |
200 |
container_issue |
2 |
container_start_page |
807 |
op_container_end_page |
821 |
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1798836194888384512 |
spelling |
ftclermontuniv:oai:HAL:hal-01236105v1 2024-05-12T07:56:13+00:00 Crustal and mantle structure beneath the Terre Adélie Craton, East Antarctica: insights from receiver function and seismic anisotropy measurements Lamarque, Gaëlle Barruol, Guilhem Fontaine, Fabrice R., R. Bascou, Jerôme Ménot, René-Pierre Laboratoire Magmas et Volcans (LMV) Observatoire de Physique du Globe de Clermont-Ferrand (OPGC) Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS) Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) Laboratoire GéoSciences Réunion (LGSR) Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris) 2015 https://hal.univ-reunion.fr/hal-01236105 https://hal.univ-reunion.fr/hal-01236105/document https://hal.univ-reunion.fr/hal-01236105/file/Lamarque_Arlita_SKS_RF_GJI_2015.pdf https://doi.org/10.1093/gji/ggu430 en eng HAL CCSD Oxford University Press (OUP) info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggu430 hal-01236105 https://hal.univ-reunion.fr/hal-01236105 https://hal.univ-reunion.fr/hal-01236105/document https://hal.univ-reunion.fr/hal-01236105/file/Lamarque_Arlita_SKS_RF_GJI_2015.pdf doi:10.1093/gji/ggu430 info:eu-repo/semantics/OpenAccess ISSN: 0956-540X EISSN: 1365-246X Geophysical Journal International https://hal.univ-reunion.fr/hal-01236105 Geophysical Journal International, 2015, ⟨10.1093/gji/ggu430⟩ Seismic anisotropy Cratons Continental tectonics: strike-slip and transform Crustal structure Antarctica [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2015 ftclermontuniv https://doi.org/10.1093/gji/ggu430 2024-04-14T23:46:38Z International audience The Terre Adélie and George V Land (East Antarctica) represent key areas for understanding tectonic relationships between terranes forming the Neoarchean-Palaeoproterozoic Terre Adélie Craton (TAC) and the neighbouring lithospheric blocks, together with the nature of its boundary. This region that represents the eastern border of the TAC is limited on its eastern side by the Mertz shear zone (MSZ) separating more recent Palaeozoic units from the craton. The MSZ, that recorded dextral strike-slip movement at 1.7 and 1.5 Ga, is likely correlated with the Kalinjala or Coorong shear zone in South Australia, east of the Gawler Craton and may therefore represent a frozen lithospheric-scale structure. In order to investigate the litho-spheric structure of the TAC and the MSZ, we deployed from 2009 October to 2011 October four temporary seismic stations, which sampled the various lithospheric units of the TAC and of the neighbouring Palaeozoic block, together with the MSZ. We used receiver function method to deduce Moho depths and seismic anisotropy technique to infer the upper mantle deformation. Results from receiver functions analysis reveal Moho at 40–44 km depth beneath the TAC, at 36 km under the MSZ and at 28 km beneath the eastern Palaeozoic domain. The MSZ therefore delimits two crustal blocks of different thicknesses with a vertical offset of the Moho of 12 km. Seismic anisotropy deduced from SKS splitting at stations on the TAC shows fast polarisation directions () trending E–W, that is, parallel to the continental margin, and delay times (δt) ranging from 0.8 to 1.6 s. These results are similar to the splitting parameters observed at the permanent GEOSCOPE Dumont D'Urville station (DRV: 95 • N, δt 1.1 s) located in the Palaeoproterozoic domain of TAC. On the MSZ, the small number of good quality measurements limits the investigation of the deep signature of the shear zone. However, the station in the Palaeozoic domain shows trending N60 • E, which is significantly different to the ... Article in Journal/Newspaper Antarc* Antarctica East Antarctica George V Land HAL Clermont Auvergne (Université Blaise Pascal Clermont-Ferrand/Université d'Auvergne) East Antarctica Dumont d'Urville ENVELOPE(140.017,140.017,-66.667,-66.667) Dumont-d'Urville ENVELOPE(140.013,140.013,-66.667,-66.667) Terre Adélie ENVELOPE(139.000,139.000,-67.000,-67.000) Terre-Adélie ENVELOPE(138.991,138.991,-59.999,-59.999) Tac ENVELOPE(-59.517,-59.517,-62.500,-62.500) George V Land ENVELOPE(148.000,148.000,-68.500,-68.500) Dumont d'Urville Station ENVELOPE(140.000,140.000,-66.667,-66.667) Geophysical Journal International 200 2 807 821 |