Volcanic passive margins : origin, structure and development
A passive margin is a non-active transition zone between the continental lithosphere and the oceanic lithosphere. Most of passive margins (>50%) show a strong magmatic development. These volcanic passive margins (VPMs) mark the lithospheric breakup over a melted mantle and they are typically char...
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ftccsdartic:oai:HAL:tel-02917958v1 2023-05-15T16:30:29+02:00 Volcanic passive margins : origin, structure and development Les marges passives volcaniques : origine, structure et développement Guan, Huixin Laboratoire Géosciences Océan (LGO) Institut Français de Recherche pour l'Exploitation de la Mer - Brest (IFREMER Centre de Bretagne) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Université de Bretagne occidentale - Brest Laurent Geoffroy 2018-07-12 https://tel.archives-ouvertes.fr/tel-02917958 https://tel.archives-ouvertes.fr/tel-02917958/document https://tel.archives-ouvertes.fr/tel-02917958/file/These-2018-SML-Geosciences_marines-GUAN_Huixin.pdf fr fre HAL CCSD NNT: 2018BRES0068 tel-02917958 https://tel.archives-ouvertes.fr/tel-02917958 https://tel.archives-ouvertes.fr/tel-02917958/document https://tel.archives-ouvertes.fr/tel-02917958/file/These-2018-SML-Geosciences_marines-GUAN_Huixin.pdf info:eu-repo/semantics/OpenAccess https://tel.archives-ouvertes.fr/tel-02917958 Sciences de la Terre. Université de Bretagne occidentale - Brest, 2018. Français. ⟨NNT : 2018BRES0068⟩ Volcanic passive margins SDRs Polyphase lithospheric extension Fragmentation of Pangea Marge passive volcanique Intrusions Extension lithosphérique Fragmentation continentale [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/doctoralThesis Theses 2018 ftccsdartic 2021-12-25T23:39:29Z A passive margin is a non-active transition zone between the continental lithosphere and the oceanic lithosphere. Most of passive margins (>50%) show a strong magmatic development. These volcanic passive margins (VPMs) mark the lithospheric breakup over a melted mantle and they are typically characterized by a huge volume of intrusive and extrusive magmatism into the crust during ante-rift, syn-rift, and post-rift periods.Based on bibliographies, seismic data (IONGXT seismic reflection profiles, 3D seismic) and observations and results gained from fieldtrips on East and West Greenland coast, the objectives of this thesis were: (1) to better characterize the tectonic accommodation of the flexure of the upper crust which beneath inner SDRs and the signification of outer SDRs, and (3) to place the magmatic breakup on the scale of the fragmentation of a supercontinent.The main results obtained are: 1) the breakup of a supercontinent is always syn-magmatic. This breakup then propagates in a non-magmatic way (paper in preparation); 2) the outer SDRs are tectonically decoupled from an exhumed continental lower crust.The material of continental origin could exist deeply continuously across a transverse aseismic ridge such as the GIFR (paper submitted); 3) The crustal flexure is also accommodated by the magma that circulate in detachment faults beneath the inner SDRs. There is a decoupling at the extrados zone of the flexure which is accommodated by syn-tectonic magma injections in the form of laccoliths between inner SDRs and upper crust. Une marge passive est une zone de transition non-active entre lithosphère continentale et lithosphère océanique. De nombreuses marges passives présentent un fort développement magmatique (>50%). Ces marges passives volcaniques (MPVs) marquent la rupture lithosphérique au-dessus d’un manteau en fusion (partielle) et sont typiquement caractérisées par l’intrusion et l’extrusion d’un volume significatif de produits magmatiques dans la croûte lors des périodes ante-rift, syn-rift ... Doctoral or Postdoctoral Thesis Greenland Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Greenland |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
French |
topic |
Volcanic passive margins SDRs Polyphase lithospheric extension Fragmentation of Pangea Marge passive volcanique Intrusions Extension lithosphérique Fragmentation continentale [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Volcanic passive margins SDRs Polyphase lithospheric extension Fragmentation of Pangea Marge passive volcanique Intrusions Extension lithosphérique Fragmentation continentale [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Guan, Huixin Volcanic passive margins : origin, structure and development |
topic_facet |
Volcanic passive margins SDRs Polyphase lithospheric extension Fragmentation of Pangea Marge passive volcanique Intrusions Extension lithosphérique Fragmentation continentale [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
A passive margin is a non-active transition zone between the continental lithosphere and the oceanic lithosphere. Most of passive margins (>50%) show a strong magmatic development. These volcanic passive margins (VPMs) mark the lithospheric breakup over a melted mantle and they are typically characterized by a huge volume of intrusive and extrusive magmatism into the crust during ante-rift, syn-rift, and post-rift periods.Based on bibliographies, seismic data (IONGXT seismic reflection profiles, 3D seismic) and observations and results gained from fieldtrips on East and West Greenland coast, the objectives of this thesis were: (1) to better characterize the tectonic accommodation of the flexure of the upper crust which beneath inner SDRs and the signification of outer SDRs, and (3) to place the magmatic breakup on the scale of the fragmentation of a supercontinent.The main results obtained are: 1) the breakup of a supercontinent is always syn-magmatic. This breakup then propagates in a non-magmatic way (paper in preparation); 2) the outer SDRs are tectonically decoupled from an exhumed continental lower crust.The material of continental origin could exist deeply continuously across a transverse aseismic ridge such as the GIFR (paper submitted); 3) The crustal flexure is also accommodated by the magma that circulate in detachment faults beneath the inner SDRs. There is a decoupling at the extrados zone of the flexure which is accommodated by syn-tectonic magma injections in the form of laccoliths between inner SDRs and upper crust. Une marge passive est une zone de transition non-active entre lithosphère continentale et lithosphère océanique. De nombreuses marges passives présentent un fort développement magmatique (>50%). Ces marges passives volcaniques (MPVs) marquent la rupture lithosphérique au-dessus d’un manteau en fusion (partielle) et sont typiquement caractérisées par l’intrusion et l’extrusion d’un volume significatif de produits magmatiques dans la croûte lors des périodes ante-rift, syn-rift ... |
author2 |
Laboratoire Géosciences Océan (LGO) Institut Français de Recherche pour l'Exploitation de la Mer - Brest (IFREMER Centre de Bretagne) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Université de Bretagne occidentale - Brest Laurent Geoffroy |
format |
Doctoral or Postdoctoral Thesis |
author |
Guan, Huixin |
author_facet |
Guan, Huixin |
author_sort |
Guan, Huixin |
title |
Volcanic passive margins : origin, structure and development |
title_short |
Volcanic passive margins : origin, structure and development |
title_full |
Volcanic passive margins : origin, structure and development |
title_fullStr |
Volcanic passive margins : origin, structure and development |
title_full_unstemmed |
Volcanic passive margins : origin, structure and development |
title_sort |
volcanic passive margins : origin, structure and development |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://tel.archives-ouvertes.fr/tel-02917958 https://tel.archives-ouvertes.fr/tel-02917958/document https://tel.archives-ouvertes.fr/tel-02917958/file/These-2018-SML-Geosciences_marines-GUAN_Huixin.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
https://tel.archives-ouvertes.fr/tel-02917958 Sciences de la Terre. Université de Bretagne occidentale - Brest, 2018. Français. ⟨NNT : 2018BRES0068⟩ |
op_relation |
NNT: 2018BRES0068 tel-02917958 https://tel.archives-ouvertes.fr/tel-02917958 https://tel.archives-ouvertes.fr/tel-02917958/document https://tel.archives-ouvertes.fr/tel-02917958/file/These-2018-SML-Geosciences_marines-GUAN_Huixin.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1766020212505706496 |