Interaction between magmatism and deformation at magma-rich rifted margins : the example of the Mozambique channel
When, where and how magmatism forms during the evolution of the margin and how to assess the relative volume of the magmatic addition compared to the inherited crust are still poorly understood. This study aims to understand these interactions and evaluate the magmatic budget and timing through the...
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ftunivnantes:oai:HAL:tel-03975520v1 2023-05-15T13:54:34+02:00 Interaction between magmatism and deformation at magma-rich rifted margins : the example of the Mozambique channel Interaction entre magmatisme et déformation dans les marges passives : l’exemple du canal du Mozambique Tomasi, Simon 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) Université de Strasbourg Gianreto Manatschal 2020-05-18 https://theses.hal.science/tel-03975520 https://theses.hal.science/tel-03975520/document https://theses.hal.science/tel-03975520/file/TOMASI_Simon_2020_ED413.pdf en eng HAL CCSD NNT: 2020STRAH001 tel-03975520 https://theses.hal.science/tel-03975520 https://theses.hal.science/tel-03975520/document https://theses.hal.science/tel-03975520/file/TOMASI_Simon_2020_ED413.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-03975520 Earth Sciences. Université de Strasbourg, 2020. English. ⟨NNT : 2020STRAH001⟩ Magma-rich margin Mozambique Antarctica Timing and budget of magmatism Tight fit restoration Marge riche en magma Antarctique Budget et timing magmatisme Reconstruction cinématique Marge volcanique [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/doctoralThesis Theses 2020 ftunivnantes 2023-02-08T01:33:44Z When, where and how magmatism forms during the evolution of the margin and how to assess the relative volume of the magmatic addition compared to the inherited crust are still poorly understood. This study aims to understand these interactions and evaluate the magmatic budget and timing through the analysis of the Mozambique-Antarctica rift system.A new method consisting in restoring end-member scenarios is developed to estimate magmatic budget in domains. This method highlights that the Mozambique Coastal Plains (MCP) and Beira High are floored by hybrid crust (i.e, thinned continental crust with magmatic additions, which fill up the accommodation space).This MCP is analysed through geophysical methods and unify 3 main characteristics of hybrid crust, which are: 1) flat, unfaulted, top basement parallel to Moho, 2) high-density crust due to significant magmatic additions, and 3) high post-rift subsidence due to plume collapse. Integrating the budget and also the timing of magmatic processes are required to characterize of a rifted margin. Therefore, a new classification is proposed linking the first order crustal shape to the magmatic budget and timing. Où, quand, et comment le magma intervient dans la formation de la marge, et comment estimer les volumes relatifs des additions magmatiques par rapport à la croûte originelle restent aujourd’hui incompris. Cette étude vise, par l’analyse du système conjugué Mozambique-Antarctique à comprendre l’interaction entre magmatisme et déformation dans l’évolution d’un rift.Une nouvelle méthode de reconstruction cinématique de scenarios permet de mettre en évidence une zone de croûte hybride : une croute continentale amincit qui est lourdement affectée par du magmatisme syn-extension qui remplit l’espace d’accommodation créé.Cette croute hybride est analysée à l’aide de méthodes géophysiques et vérifie 3 caractéristiques majeures: 1) toit du socle plat, parallèle au Moho, 2) une densité crustale élevée à cause du magmatisme, 3) une grande subsidence thermale due à la ... Doctoral or Postdoctoral Thesis Antarc* Antarctica Antarctique* Université de Nantes: HAL-UNIV-NANTES |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
Magma-rich margin Mozambique Antarctica Timing and budget of magmatism Tight fit restoration Marge riche en magma Antarctique Budget et timing magmatisme Reconstruction cinématique Marge volcanique [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Magma-rich margin Mozambique Antarctica Timing and budget of magmatism Tight fit restoration Marge riche en magma Antarctique Budget et timing magmatisme Reconstruction cinématique Marge volcanique [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Tomasi, Simon Interaction between magmatism and deformation at magma-rich rifted margins : the example of the Mozambique channel |
topic_facet |
Magma-rich margin Mozambique Antarctica Timing and budget of magmatism Tight fit restoration Marge riche en magma Antarctique Budget et timing magmatisme Reconstruction cinématique Marge volcanique [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
When, where and how magmatism forms during the evolution of the margin and how to assess the relative volume of the magmatic addition compared to the inherited crust are still poorly understood. This study aims to understand these interactions and evaluate the magmatic budget and timing through the analysis of the Mozambique-Antarctica rift system.A new method consisting in restoring end-member scenarios is developed to estimate magmatic budget in domains. This method highlights that the Mozambique Coastal Plains (MCP) and Beira High are floored by hybrid crust (i.e, thinned continental crust with magmatic additions, which fill up the accommodation space).This MCP is analysed through geophysical methods and unify 3 main characteristics of hybrid crust, which are: 1) flat, unfaulted, top basement parallel to Moho, 2) high-density crust due to significant magmatic additions, and 3) high post-rift subsidence due to plume collapse. Integrating the budget and also the timing of magmatic processes are required to characterize of a rifted margin. Therefore, a new classification is proposed linking the first order crustal shape to the magmatic budget and timing. Où, quand, et comment le magma intervient dans la formation de la marge, et comment estimer les volumes relatifs des additions magmatiques par rapport à la croûte originelle restent aujourd’hui incompris. Cette étude vise, par l’analyse du système conjugué Mozambique-Antarctique à comprendre l’interaction entre magmatisme et déformation dans l’évolution d’un rift.Une nouvelle méthode de reconstruction cinématique de scenarios permet de mettre en évidence une zone de croûte hybride : une croute continentale amincit qui est lourdement affectée par du magmatisme syn-extension qui remplit l’espace d’accommodation créé.Cette croute hybride est analysée à l’aide de méthodes géophysiques et vérifie 3 caractéristiques majeures: 1) toit du socle plat, parallèle au Moho, 2) une densité crustale élevée à cause du magmatisme, 3) une grande subsidence thermale due à la ... |
author2 |
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) Université de Strasbourg Gianreto Manatschal |
format |
Doctoral or Postdoctoral Thesis |
author |
Tomasi, Simon |
author_facet |
Tomasi, Simon |
author_sort |
Tomasi, Simon |
title |
Interaction between magmatism and deformation at magma-rich rifted margins : the example of the Mozambique channel |
title_short |
Interaction between magmatism and deformation at magma-rich rifted margins : the example of the Mozambique channel |
title_full |
Interaction between magmatism and deformation at magma-rich rifted margins : the example of the Mozambique channel |
title_fullStr |
Interaction between magmatism and deformation at magma-rich rifted margins : the example of the Mozambique channel |
title_full_unstemmed |
Interaction between magmatism and deformation at magma-rich rifted margins : the example of the Mozambique channel |
title_sort |
interaction between magmatism and deformation at magma-rich rifted margins : the example of the mozambique channel |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://theses.hal.science/tel-03975520 https://theses.hal.science/tel-03975520/document https://theses.hal.science/tel-03975520/file/TOMASI_Simon_2020_ED413.pdf |
genre |
Antarc* Antarctica Antarctique* |
genre_facet |
Antarc* Antarctica Antarctique* |
op_source |
https://theses.hal.science/tel-03975520 Earth Sciences. Université de Strasbourg, 2020. English. ⟨NNT : 2020STRAH001⟩ |
op_relation |
NNT: 2020STRAH001 tel-03975520 https://theses.hal.science/tel-03975520 https://theses.hal.science/tel-03975520/document https://theses.hal.science/tel-03975520/file/TOMASI_Simon_2020_ED413.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1766260557862666240 |