The Limpopo Magma-Rich Transform Margin, South Mozambique: 1. Insights From Deep-Structure Seismic Imaging
International audience A variety of structures results from the interplay of evolving far-field forces, plate kinematics, and magmatic activity during continental break-up. The east Limpopo transform margin, offshore northern Mozambique, formed as Africa and Antarctica separated during the mid-Juras...
Published in: | Tectonics |
---|---|
Main Authors: | , , , , , , , , , , , , , |
Other Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2021
|
Subjects: | |
Online Access: | https://insu.hal.science/insu-03594270 https://insu.hal.science/insu-03594270/document https://insu.hal.science/insu-03594270/file/89885.pdf https://doi.org/10.1029/2021TC006915 |
id |
ftinsu:oai:HAL:insu-03594270v1 |
---|---|
record_format |
openpolar |
spelling |
ftinsu:oai:HAL:insu-03594270v1 2024-02-11T09:56:05+01:00 The Limpopo Magma-Rich Transform Margin, South Mozambique: 1. Insights From Deep-Structure Seismic Imaging Watremez, L. Leroy, S. d'Acremont, E. Roche, V. Evain, M. Leprêtre, A. Verrier, F. Aslanian, D. Dias, N. Afilhado, A. Schnürle, P. Castilla, R. Despinois, F. Moulin, M. Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG) Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Nord ) 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) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Instituto Dom Luís Universidade de Lisboa = University of Lisbon (ULISBOA) Faculdade de Ciências Lisboa Instituto Superior de Engenharia de Lisboa (ISEL) Géo-Energie Zurich TotalEnergies 2021 https://insu.hal.science/insu-03594270 https://insu.hal.science/insu-03594270/document https://insu.hal.science/insu-03594270/file/89885.pdf https://doi.org/10.1029/2021TC006915 en eng HAL CCSD American Geophysical Union (AGU) info:eu-repo/semantics/altIdentifier/doi/10.1029/2021TC006915 insu-03594270 https://insu.hal.science/insu-03594270 https://insu.hal.science/insu-03594270/document https://insu.hal.science/insu-03594270/file/89885.pdf BIBCODE: 2021Tecto.4006915W doi:10.1029/2021TC006915 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess ISSN: 0278-7407 EISSN: 1944-9194 Tectonics https://insu.hal.science/insu-03594270 Tectonics, 2021, 40, ⟨10.1029/2021TC006915⟩ magmatism seismic refraction transform margin Mozambique [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2021 ftinsu https://doi.org/10.1029/2021TC006915 2024-01-24T17:29:20Z International audience A variety of structures results from the interplay of evolving far-field forces, plate kinematics, and magmatic activity during continental break-up. The east Limpopo transform margin, offshore northern Mozambique, formed as Africa and Antarctica separated during the mid-Jurassic period break-up of the Gondwana supercontinent. The nature of the crust onshore has been discussed for decades in an effort to resolve issues with plate kinematic models. Two seismic refraction profiles with coincident multichannel seismic reflection profiles allow us to interpret the seismic velocity structures across the margin, both onshore and offshore. These seismic profiles allow us to (a) delineate the major regional crustal domains; (b) identify widespread indications of magmatic activity; and (c) map crustal structure and geometry of this magma-rich transform margin. Careful examination of the profiles allows us to make the following observations and interpretations: (a) on land, continental crust is overlain by a >10-km thick volcano-sedimentary wedge related to an early rifting stage, (b) offshore, thick oceanic crust formed due to intense magmatic activity, and between the two (c) a 50-60-km wide transform zone where the crustal structures are affected by intense magmatic activity and faulting. The prominent presence of intrusive and extrusive igneous units may be attributed to the combination of a deep-seated melting anomaly and a trans-tensional fault zone running through thinned lithosphere that allowed melt to reach the surface. A comparison of the crustal thinning along other transform margins shows a probable dependence with the thermal and/or tectonic history of the lithosphere. Article in Journal/Newspaper Antarc* Antarctica Institut national des sciences de l'Univers: HAL-INSU Tectonics 40 12 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
magmatism seismic refraction transform margin Mozambique [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
magmatism seismic refraction transform margin Mozambique [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Watremez, L. Leroy, S. d'Acremont, E. Roche, V. Evain, M. Leprêtre, A. Verrier, F. Aslanian, D. Dias, N. Afilhado, A. Schnürle, P. Castilla, R. Despinois, F. Moulin, M. The Limpopo Magma-Rich Transform Margin, South Mozambique: 1. Insights From Deep-Structure Seismic Imaging |
topic_facet |
magmatism seismic refraction transform margin Mozambique [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience A variety of structures results from the interplay of evolving far-field forces, plate kinematics, and magmatic activity during continental break-up. The east Limpopo transform margin, offshore northern Mozambique, formed as Africa and Antarctica separated during the mid-Jurassic period break-up of the Gondwana supercontinent. The nature of the crust onshore has been discussed for decades in an effort to resolve issues with plate kinematic models. Two seismic refraction profiles with coincident multichannel seismic reflection profiles allow us to interpret the seismic velocity structures across the margin, both onshore and offshore. These seismic profiles allow us to (a) delineate the major regional crustal domains; (b) identify widespread indications of magmatic activity; and (c) map crustal structure and geometry of this magma-rich transform margin. Careful examination of the profiles allows us to make the following observations and interpretations: (a) on land, continental crust is overlain by a >10-km thick volcano-sedimentary wedge related to an early rifting stage, (b) offshore, thick oceanic crust formed due to intense magmatic activity, and between the two (c) a 50-60-km wide transform zone where the crustal structures are affected by intense magmatic activity and faulting. The prominent presence of intrusive and extrusive igneous units may be attributed to the combination of a deep-seated melting anomaly and a trans-tensional fault zone running through thinned lithosphere that allowed melt to reach the surface. A comparison of the crustal thinning along other transform margins shows a probable dependence with the thermal and/or tectonic history of the lithosphere. |
author2 |
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG) Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Nord ) 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) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Instituto Dom Luís Universidade de Lisboa = University of Lisbon (ULISBOA) Faculdade de Ciências Lisboa Instituto Superior de Engenharia de Lisboa (ISEL) Géo-Energie Zurich TotalEnergies |
format |
Article in Journal/Newspaper |
author |
Watremez, L. Leroy, S. d'Acremont, E. Roche, V. Evain, M. Leprêtre, A. Verrier, F. Aslanian, D. Dias, N. Afilhado, A. Schnürle, P. Castilla, R. Despinois, F. Moulin, M. |
author_facet |
Watremez, L. Leroy, S. d'Acremont, E. Roche, V. Evain, M. Leprêtre, A. Verrier, F. Aslanian, D. Dias, N. Afilhado, A. Schnürle, P. Castilla, R. Despinois, F. Moulin, M. |
author_sort |
Watremez, L. |
title |
The Limpopo Magma-Rich Transform Margin, South Mozambique: 1. Insights From Deep-Structure Seismic Imaging |
title_short |
The Limpopo Magma-Rich Transform Margin, South Mozambique: 1. Insights From Deep-Structure Seismic Imaging |
title_full |
The Limpopo Magma-Rich Transform Margin, South Mozambique: 1. Insights From Deep-Structure Seismic Imaging |
title_fullStr |
The Limpopo Magma-Rich Transform Margin, South Mozambique: 1. Insights From Deep-Structure Seismic Imaging |
title_full_unstemmed |
The Limpopo Magma-Rich Transform Margin, South Mozambique: 1. Insights From Deep-Structure Seismic Imaging |
title_sort |
limpopo magma-rich transform margin, south mozambique: 1. insights from deep-structure seismic imaging |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://insu.hal.science/insu-03594270 https://insu.hal.science/insu-03594270/document https://insu.hal.science/insu-03594270/file/89885.pdf https://doi.org/10.1029/2021TC006915 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
ISSN: 0278-7407 EISSN: 1944-9194 Tectonics https://insu.hal.science/insu-03594270 Tectonics, 2021, 40, ⟨10.1029/2021TC006915⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2021TC006915 insu-03594270 https://insu.hal.science/insu-03594270 https://insu.hal.science/insu-03594270/document https://insu.hal.science/insu-03594270/file/89885.pdf BIBCODE: 2021Tecto.4006915W doi:10.1029/2021TC006915 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2021TC006915 |
container_title |
Tectonics |
container_volume |
40 |
container_issue |
12 |
_version_ |
1790600599463526400 |