Extension of continental lithosphere in rifted margins: a review of thinning mechanisms
International audience Crustal geometries imaged at rifted margins show contrasted first-order morphologies (wide and narrow, symmetric or asymmetric conjugates). This contribution aims to review the mechanisms of continental lithospheric thinning and types of extensional structures that control the...
Published in: | Comptes Rendus. Géoscience |
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Main Authors: | , , , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2024
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Online Access: | https://hal.science/hal-04587035 https://hal.science/hal-04587035/document https://hal.science/hal-04587035/file/CRGEOS_2024__356_S2_A20_0.pdf https://doi.org/10.5802/crgeos.257 |
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HAL Sorbonne Université |
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language |
English |
topic |
Lithosphere thinning Rifted margins Depth dependent thinning Amincissement de la lithosphère Marges passives Amincissement dépendant de la profondeur [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics |
spellingShingle |
Lithosphere thinning Rifted margins Depth dependent thinning Amincissement de la lithosphère Marges passives Amincissement dépendant de la profondeur [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics Tugend, Julie Mohn, Geoffroy Duretz, Thibault Petri, Benoit Le Pourhiet, Laetitia Extension of continental lithosphere in rifted margins: a review of thinning mechanisms |
topic_facet |
Lithosphere thinning Rifted margins Depth dependent thinning Amincissement de la lithosphère Marges passives Amincissement dépendant de la profondeur [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics |
description |
International audience Crustal geometries imaged at rifted margins show contrasted first-order morphologies (wide and narrow, symmetric or asymmetric conjugates). This contribution aims to review the mechanisms of continental lithospheric thinning and types of extensional structures that control the formation of rifted margins. We illustrate, using a two-layer numerical model (one for the crust and one for the mantle), how different modes of lithospheric thinning shape the end-member crustal geometries of rifted margins depending on the initial thermal conditions and extension rates. As already known, the activation of narrow or wide modes of lithospheric thinning depends on the rheological behaviour of the lower crust and its efficiency as a decoupling layer. Morphologies generated by narrow lithospheric thinning modes compare well with Atlantic-type rifted margins (e.g., Iberia–Newfoundland) while wide lithospheric thinning modes better apply to marginal seas characterized by higher initial geothermal gradients (e.g., South China Sea). Finally, we also emphasize that continental lithosphere thinning is depth-dependent, part of which is transient and cannot easily be measured in natural systems. L’architecture crustale des marges passives imagée par les méthodes géophysiques est contrastée montrant des morphologies tantôt larges ou étroites, les profils conjugués pouvant être symétriques ou asymétriques. Cette contribution présente les mécanismes d’amincissement de la lithosphère continentale et les différents types de structures extensives qui contrôlent la formation des marges passives. L’utilisation d’un modèle à deux couches (une pour la croûte et une pour le manteau), permet d’illustrer comment les différents modes d’amincissement de la lithosphère façonnent l’architecture premier ordre des marges passives pour différents taux d’extension et conditions thermiques initiales. Comme précédemment démontré, l’activation d’un mode d’amincissement de la lithosphère étroit/localisé ou large/distribué dépend du ... |
author2 |
Laboratoire Géosciences et Environnement Cergy (GEC) Fédération INSTITUT DES MATÉRIAUX DE CERGY-PONTOISE (I-MAT) CY Cergy Paris Université (CY)-CY Cergy Paris Université (CY) Goethe University Frankfurt Institut für Geowissenschaften Frankfurt Institut Terre Environnement Strasbourg (ITES) École Nationale du Génie de l'Eau et de l'Environnement de Strasbourg (ENGEES)-Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Institut des Sciences de la Terre de Paris (iSTeP) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Tugend, Julie Mohn, Geoffroy Duretz, Thibault Petri, Benoit Le Pourhiet, Laetitia |
author_facet |
Tugend, Julie Mohn, Geoffroy Duretz, Thibault Petri, Benoit Le Pourhiet, Laetitia |
author_sort |
Tugend, Julie |
title |
Extension of continental lithosphere in rifted margins: a review of thinning mechanisms |
title_short |
Extension of continental lithosphere in rifted margins: a review of thinning mechanisms |
title_full |
Extension of continental lithosphere in rifted margins: a review of thinning mechanisms |
title_fullStr |
Extension of continental lithosphere in rifted margins: a review of thinning mechanisms |
title_full_unstemmed |
Extension of continental lithosphere in rifted margins: a review of thinning mechanisms |
title_sort |
extension of continental lithosphere in rifted margins: a review of thinning mechanisms |
publisher |
HAL CCSD |
publishDate |
2024 |
url |
https://hal.science/hal-04587035 https://hal.science/hal-04587035/document https://hal.science/hal-04587035/file/CRGEOS_2024__356_S2_A20_0.pdf https://doi.org/10.5802/crgeos.257 |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_source |
ISSN: 1631-0713 EISSN: 1778-7025 Comptes Rendus. Géoscience https://hal.science/hal-04587035 Comptes Rendus. Géoscience, 2024, Geodynamics of Continents and Oceans – A tribute to Jean Aubouin, 356 (S2), pp.1 - 35. ⟨10.5802/crgeos.257⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5802/crgeos.257 hal-04587035 https://hal.science/hal-04587035 https://hal.science/hal-04587035/document https://hal.science/hal-04587035/file/CRGEOS_2024__356_S2_A20_0.pdf doi:10.5802/crgeos.257 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5802/crgeos.257 |
container_title |
Comptes Rendus. Géoscience |
container_volume |
356 |
container_issue |
S2 |
container_start_page |
331 |
op_container_end_page |
365 |
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1809923339811028992 |
spelling |
ftsorbonneuniv:oai:HAL:hal-04587035v1 2024-09-09T19:53:53+00:00 Extension of continental lithosphere in rifted margins: a review of thinning mechanisms Extension de la lithosphère continentale dans les marges passives : une synthèse des mécanismes d’amincissement Tugend, Julie Mohn, Geoffroy Duretz, Thibault Petri, Benoit Le Pourhiet, Laetitia Laboratoire Géosciences et Environnement Cergy (GEC) Fédération INSTITUT DES MATÉRIAUX DE CERGY-PONTOISE (I-MAT) CY Cergy Paris Université (CY)-CY Cergy Paris Université (CY) Goethe University Frankfurt Institut für Geowissenschaften Frankfurt Institut Terre Environnement Strasbourg (ITES) École Nationale du Génie de l'Eau et de l'Environnement de Strasbourg (ENGEES)-Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Institut des Sciences de la Terre de Paris (iSTeP) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) 2024 https://hal.science/hal-04587035 https://hal.science/hal-04587035/document https://hal.science/hal-04587035/file/CRGEOS_2024__356_S2_A20_0.pdf https://doi.org/10.5802/crgeos.257 en eng HAL CCSD Académie des sciences (Paris) info:eu-repo/semantics/altIdentifier/doi/10.5802/crgeos.257 hal-04587035 https://hal.science/hal-04587035 https://hal.science/hal-04587035/document https://hal.science/hal-04587035/file/CRGEOS_2024__356_S2_A20_0.pdf doi:10.5802/crgeos.257 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1631-0713 EISSN: 1778-7025 Comptes Rendus. Géoscience https://hal.science/hal-04587035 Comptes Rendus. Géoscience, 2024, Geodynamics of Continents and Oceans – A tribute to Jean Aubouin, 356 (S2), pp.1 - 35. ⟨10.5802/crgeos.257⟩ Lithosphere thinning Rifted margins Depth dependent thinning Amincissement de la lithosphère Marges passives Amincissement dépendant de la profondeur [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics info:eu-repo/semantics/article Journal articles 2024 ftsorbonneuniv https://doi.org/10.5802/crgeos.257 2024-07-25T23:47:36Z International audience Crustal geometries imaged at rifted margins show contrasted first-order morphologies (wide and narrow, symmetric or asymmetric conjugates). This contribution aims to review the mechanisms of continental lithospheric thinning and types of extensional structures that control the formation of rifted margins. We illustrate, using a two-layer numerical model (one for the crust and one for the mantle), how different modes of lithospheric thinning shape the end-member crustal geometries of rifted margins depending on the initial thermal conditions and extension rates. As already known, the activation of narrow or wide modes of lithospheric thinning depends on the rheological behaviour of the lower crust and its efficiency as a decoupling layer. Morphologies generated by narrow lithospheric thinning modes compare well with Atlantic-type rifted margins (e.g., Iberia–Newfoundland) while wide lithospheric thinning modes better apply to marginal seas characterized by higher initial geothermal gradients (e.g., South China Sea). Finally, we also emphasize that continental lithosphere thinning is depth-dependent, part of which is transient and cannot easily be measured in natural systems. L’architecture crustale des marges passives imagée par les méthodes géophysiques est contrastée montrant des morphologies tantôt larges ou étroites, les profils conjugués pouvant être symétriques ou asymétriques. Cette contribution présente les mécanismes d’amincissement de la lithosphère continentale et les différents types de structures extensives qui contrôlent la formation des marges passives. L’utilisation d’un modèle à deux couches (une pour la croûte et une pour le manteau), permet d’illustrer comment les différents modes d’amincissement de la lithosphère façonnent l’architecture premier ordre des marges passives pour différents taux d’extension et conditions thermiques initiales. Comme précédemment démontré, l’activation d’un mode d’amincissement de la lithosphère étroit/localisé ou large/distribué dépend du ... Article in Journal/Newspaper Newfoundland HAL Sorbonne Université Comptes Rendus. Géoscience 356 S2 331 365 |