Contribution of AMS measurements in understanding the migmatitic terrains of Pointe Géologie, Terre Adélie (East-Antarctica)
International audience A detailed magnetic mapping using Anisotropy of Magnetic Susceptibility (AMS) technique was carried out in Pointe Géologie archipelago (Terre Adélie, East Antarctica) that represents a hot crust having experienced a long-lived anatectic event during Paleoproterozoic times, 1.6...
Published in: | Tectonophysics |
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Main Authors: | , , , , |
Other Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2013
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Subjects: | |
Online Access: | https://hal.univ-reunion.fr/hal-01304296 https://hal.univ-reunion.fr/hal-01304296/document https://hal.univ-reunion.fr/hal-01304296/file/Bascou_ASM_Terre_Adelie_Tphy2013_hal.pdf https://doi.org/10.1016/j.tecto.2013.05.021 |
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Institut national des sciences de l'Univers: HAL-INSU |
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English |
topic |
Migmatite Anatexite AMS Pointe Géologie Terre Adélie East Antarctica [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography |
spellingShingle |
Migmatite Anatexite AMS Pointe Géologie Terre Adélie East Antarctica [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography Bascou, Jerôme Henry, Bernard Ménot, René-Pierre Funaki, Minoru Barruol, Guilhem Contribution of AMS measurements in understanding the migmatitic terrains of Pointe Géologie, Terre Adélie (East-Antarctica) |
topic_facet |
Migmatite Anatexite AMS Pointe Géologie Terre Adélie East Antarctica [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography |
description |
International audience A detailed magnetic mapping using Anisotropy of Magnetic Susceptibility (AMS) technique was carried out in Pointe Géologie archipelago (Terre Adélie, East Antarctica) that represents a hot crust having experienced a long-lived anatectic event during Paleoproterozoic times, 1.69 Ga ago. AMS measurements allowed to better analyse the tectonic structure of the crystalline basement that is built up by rocks affected by various degrees of partial melting and then, devoid of clear strain markers. AMS sampling was performed from main rocks types of Pointe Géologie: migmatites including leucosomes and melanosomes, coarse-grained pink granites, anatexites and mylonitic gneisses. For melanosomes, the magnetic foliation is dominantly in agreement with the observed field foliation, i.e. dominantly N–S sub-vertical in shear zones and gently inclined in dome structures. AMS technique reveals a sub-horizontal magnetic lineation in migmatites from shear zones and a gently plunging one in dome structures. Magnetic properties of leucosomes and of coarse-pink granitic dykes contrast with melanosomes. The bulk susceptibility and anisotropy degree are significantly lower in granitic magmas that in melanosomes. In addition, in well-defined leucosomes, granitic dykes and anatexites, the magnetic ellipsoid is characterized by a higher plunge of the magnetic lineation, which tends to be vertical. This is associated to a rheological contrast between the solid-state deformation suffered by oxide grains in the melanosomes and their reorientation in a viscous flow during the transfer of felsic melt to the granitic dykes. Magnetic structure of leucosomes, granitic dykes and anatexites highlights the role of the gravity-induced upwelling of a crust undergoing high degree of partial melting in a transpressional regime. |
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) NIPR 1-9-10 Kaga, Itabashi-ku, Tokyo 173-8515, Japan (NIPR) NIPR, 1-9-10 Kaga, Itabashi-ku, Tokyo 173-8515 Japon Laboratoire GéoSciences Réunion (LGSR) Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris) IPEV, program ARLITA |
format |
Article in Journal/Newspaper |
author |
Bascou, Jerôme Henry, Bernard Ménot, René-Pierre Funaki, Minoru Barruol, Guilhem |
author_facet |
Bascou, Jerôme Henry, Bernard Ménot, René-Pierre Funaki, Minoru Barruol, Guilhem |
author_sort |
Bascou, Jerôme |
title |
Contribution of AMS measurements in understanding the migmatitic terrains of Pointe Géologie, Terre Adélie (East-Antarctica) |
title_short |
Contribution of AMS measurements in understanding the migmatitic terrains of Pointe Géologie, Terre Adélie (East-Antarctica) |
title_full |
Contribution of AMS measurements in understanding the migmatitic terrains of Pointe Géologie, Terre Adélie (East-Antarctica) |
title_fullStr |
Contribution of AMS measurements in understanding the migmatitic terrains of Pointe Géologie, Terre Adélie (East-Antarctica) |
title_full_unstemmed |
Contribution of AMS measurements in understanding the migmatitic terrains of Pointe Géologie, Terre Adélie (East-Antarctica) |
title_sort |
contribution of ams measurements in understanding the migmatitic terrains of pointe géologie, terre adélie (east-antarctica) |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://hal.univ-reunion.fr/hal-01304296 https://hal.univ-reunion.fr/hal-01304296/document https://hal.univ-reunion.fr/hal-01304296/file/Bascou_ASM_Terre_Adelie_Tphy2013_hal.pdf https://doi.org/10.1016/j.tecto.2013.05.021 |
long_lat |
ENVELOPE(140.017,140.017,-66.667,-66.667) ENVELOPE(139.000,139.000,-67.000,-67.000) ENVELOPE(138.991,138.991,-59.999,-59.999) |
geographic |
East Antarctica Pointe-Géologie Terre Adélie Terre-Adélie |
geographic_facet |
East Antarctica Pointe-Géologie Terre Adélie Terre-Adélie |
genre |
Antarc* Antarctica East Antarctica |
genre_facet |
Antarc* Antarctica East Antarctica |
op_source |
ISSN: 0040-1951 EISSN: 1879-3266 Tectonophysics https://hal.univ-reunion.fr/hal-01304296 Tectonophysics, 2013, 603, pp.123-135. ⟨10.1016/j.tecto.2013.05.021⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.tecto.2013.05.021 hal-01304296 https://hal.univ-reunion.fr/hal-01304296 https://hal.univ-reunion.fr/hal-01304296/document https://hal.univ-reunion.fr/hal-01304296/file/Bascou_ASM_Terre_Adelie_Tphy2013_hal.pdf doi:10.1016/j.tecto.2013.05.021 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.tecto.2013.05.021 |
container_title |
Tectonophysics |
container_volume |
603 |
container_start_page |
123 |
op_container_end_page |
135 |
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1769010769876221952 |
spelling |
ftinsu:oai:HAL:hal-01304296v1 2023-06-18T03:37:58+02:00 Contribution of AMS measurements in understanding the migmatitic terrains of Pointe Géologie, Terre Adélie (East-Antarctica) Bascou, Jerôme Henry, Bernard Ménot, René-Pierre Funaki, Minoru Barruol, Guilhem 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) NIPR 1-9-10 Kaga, Itabashi-ku, Tokyo 173-8515, Japan (NIPR) NIPR, 1-9-10 Kaga, Itabashi-ku, Tokyo 173-8515 Japon Laboratoire GéoSciences Réunion (LGSR) Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris) IPEV, program ARLITA 2013-09-01 https://hal.univ-reunion.fr/hal-01304296 https://hal.univ-reunion.fr/hal-01304296/document https://hal.univ-reunion.fr/hal-01304296/file/Bascou_ASM_Terre_Adelie_Tphy2013_hal.pdf https://doi.org/10.1016/j.tecto.2013.05.021 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.tecto.2013.05.021 hal-01304296 https://hal.univ-reunion.fr/hal-01304296 https://hal.univ-reunion.fr/hal-01304296/document https://hal.univ-reunion.fr/hal-01304296/file/Bascou_ASM_Terre_Adelie_Tphy2013_hal.pdf doi:10.1016/j.tecto.2013.05.021 info:eu-repo/semantics/OpenAccess ISSN: 0040-1951 EISSN: 1879-3266 Tectonophysics https://hal.univ-reunion.fr/hal-01304296 Tectonophysics, 2013, 603, pp.123-135. ⟨10.1016/j.tecto.2013.05.021⟩ Migmatite Anatexite AMS Pointe Géologie Terre Adélie East Antarctica [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography info:eu-repo/semantics/article Journal articles 2013 ftinsu https://doi.org/10.1016/j.tecto.2013.05.021 2023-06-06T01:05:57Z International audience A detailed magnetic mapping using Anisotropy of Magnetic Susceptibility (AMS) technique was carried out in Pointe Géologie archipelago (Terre Adélie, East Antarctica) that represents a hot crust having experienced a long-lived anatectic event during Paleoproterozoic times, 1.69 Ga ago. AMS measurements allowed to better analyse the tectonic structure of the crystalline basement that is built up by rocks affected by various degrees of partial melting and then, devoid of clear strain markers. AMS sampling was performed from main rocks types of Pointe Géologie: migmatites including leucosomes and melanosomes, coarse-grained pink granites, anatexites and mylonitic gneisses. For melanosomes, the magnetic foliation is dominantly in agreement with the observed field foliation, i.e. dominantly N–S sub-vertical in shear zones and gently inclined in dome structures. AMS technique reveals a sub-horizontal magnetic lineation in migmatites from shear zones and a gently plunging one in dome structures. Magnetic properties of leucosomes and of coarse-pink granitic dykes contrast with melanosomes. The bulk susceptibility and anisotropy degree are significantly lower in granitic magmas that in melanosomes. In addition, in well-defined leucosomes, granitic dykes and anatexites, the magnetic ellipsoid is characterized by a higher plunge of the magnetic lineation, which tends to be vertical. This is associated to a rheological contrast between the solid-state deformation suffered by oxide grains in the melanosomes and their reorientation in a viscous flow during the transfer of felsic melt to the granitic dykes. Magnetic structure of leucosomes, granitic dykes and anatexites highlights the role of the gravity-induced upwelling of a crust undergoing high degree of partial melting in a transpressional regime. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Institut national des sciences de l'Univers: HAL-INSU East Antarctica Pointe-Géologie ENVELOPE(140.017,140.017,-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) Tectonophysics 603 123 135 |