East African Fracture Zones: a long lifespan since the breakup of Gondwana
International audience Gondwana splitting started during the Early Jurassic (ca. 180 Ma) with the separation of Antarctica and Madagascar from Africa, followed by the separation of South America and Africa during the Middle Jurassic. Thanks to recent seismic profiles for petroleum exploration, the a...
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Language: | English |
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HAL CCSD
2022
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Online Access: | https://insu.hal.science/insu-03693914 https://doi.org/10.5194/egusphere-egu22-12463 |
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Institut National de la Recherche Agronomique: ProdINRA |
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ftinraparis |
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English |
topic |
[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy |
spellingShingle |
[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy Roche, Vincent Leroy, Sylvie Ringenbach, Jean-Claude Sapin, François Révillon, Sidonie Guillocheau, François Vetel, William Watremez, Louise East African Fracture Zones: a long lifespan since the breakup of Gondwana |
topic_facet |
[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy |
description |
International audience Gondwana splitting started during the Early Jurassic (ca. 180 Ma) with the separation of Antarctica and Madagascar from Africa, followed by the separation of South America and Africa during the Middle Jurassic. Thanks to recent seismic profiles for petroleum exploration, the architecture of rifted margins and the transform faults zones, which developed as a result of the relative motion between tectonic plates have been recently evidenced and studied along the whole eastern and south-eastern Africa (i.e., in the Western Somali Basin, the Mozambique Basin, the Natal Basin, and the Outeniqua Basin). Yet, the structure and overall kinematic evolution of the three major transform faults zones together – i.e., the Agulhas, the Davie, and the Limpopo Fracture Zones – that control the opening of these major oceanic basins remain poorly studied. The interpretation of an extensive regional multichannel seismic dataset coupled with recent studies allows us to propose an accurate regional mapping of the crustal domains and major structural elements along the rifted margins along the whole eastern and south-eastern Africa. We provide new constraints on the structuration and evolution of these three transform systems. Although our findings indicate common features in transform style (e.g., a right-lateral transform system, a wide sheared corridor), the deformation and the thermal regime along these systems appear quite different. In particular, we show that the Davie and Agulhas Fracture Zones recorded spectacular inversions during the transform stage whereas transtensional deformation is observed along the Limpopo Fracture Zone during its activity. This suggests that faults activity controls vertical displacements along transform margins, minimising other processes such as thermal exchanges between the oceanic and continental lithospheres across the transform fault and flexural behaviour of the lithosphere. This different style of deformation may be explained by two main forcing parameters: (i) the ... |
author2 |
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) TotalEnergies Sedisor Géosciences Rennes (GR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS) 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 ) European Geosciences Union |
format |
Conference Object |
author |
Roche, Vincent Leroy, Sylvie Ringenbach, Jean-Claude Sapin, François Révillon, Sidonie Guillocheau, François Vetel, William Watremez, Louise |
author_facet |
Roche, Vincent Leroy, Sylvie Ringenbach, Jean-Claude Sapin, François Révillon, Sidonie Guillocheau, François Vetel, William Watremez, Louise |
author_sort |
Roche, Vincent |
title |
East African Fracture Zones: a long lifespan since the breakup of Gondwana |
title_short |
East African Fracture Zones: a long lifespan since the breakup of Gondwana |
title_full |
East African Fracture Zones: a long lifespan since the breakup of Gondwana |
title_fullStr |
East African Fracture Zones: a long lifespan since the breakup of Gondwana |
title_full_unstemmed |
East African Fracture Zones: a long lifespan since the breakup of Gondwana |
title_sort |
east african fracture zones: a long lifespan since the breakup of gondwana |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://insu.hal.science/insu-03693914 https://doi.org/10.5194/egusphere-egu22-12463 |
op_coverage |
Vienna, Austria |
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ENVELOPE(78.139,78.139,-68.582,-68.582) ENVELOPE(78.139,78.139,-68.582,-68.582) |
geographic |
Corridor The Corridor, The |
geographic_facet |
Corridor The Corridor, The |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
EGU General Assembly 2022 https://insu.hal.science/insu-03693914 EGU General Assembly 2022, European Geosciences Union, May 2022, Vienna, Austria. pp.EGU22-12463, ⟨10.5194/egusphere-egu22-12463⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-egu22-12463 insu-03693914 https://insu.hal.science/insu-03693914 doi:10.5194/egusphere-egu22-12463 |
op_rights |
http://creativecommons.org/licenses/by/ |
op_doi |
https://doi.org/10.5194/egusphere-egu22-12463 |
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1802650628921491456 |
spelling |
ftinraparis:oai:HAL:insu-03693914v1 2024-06-23T07:47:04+00:00 East African Fracture Zones: a long lifespan since the breakup of Gondwana Roche, Vincent Leroy, Sylvie Ringenbach, Jean-Claude Sapin, François Révillon, Sidonie Guillocheau, François Vetel, William Watremez, Louise 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) TotalEnergies Sedisor Géosciences Rennes (GR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS) 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 ) European Geosciences Union Vienna, Austria 2022-05-23 https://insu.hal.science/insu-03693914 https://doi.org/10.5194/egusphere-egu22-12463 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-egu22-12463 insu-03693914 https://insu.hal.science/insu-03693914 doi:10.5194/egusphere-egu22-12463 http://creativecommons.org/licenses/by/ EGU General Assembly 2022 https://insu.hal.science/insu-03693914 EGU General Assembly 2022, European Geosciences Union, May 2022, Vienna, Austria. pp.EGU22-12463, ⟨10.5194/egusphere-egu22-12463⟩ [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy info:eu-repo/semantics/conferenceObject Conference papers 2022 ftinraparis https://doi.org/10.5194/egusphere-egu22-12463 2024-06-04T15:12:16Z International audience Gondwana splitting started during the Early Jurassic (ca. 180 Ma) with the separation of Antarctica and Madagascar from Africa, followed by the separation of South America and Africa during the Middle Jurassic. Thanks to recent seismic profiles for petroleum exploration, the architecture of rifted margins and the transform faults zones, which developed as a result of the relative motion between tectonic plates have been recently evidenced and studied along the whole eastern and south-eastern Africa (i.e., in the Western Somali Basin, the Mozambique Basin, the Natal Basin, and the Outeniqua Basin). Yet, the structure and overall kinematic evolution of the three major transform faults zones together – i.e., the Agulhas, the Davie, and the Limpopo Fracture Zones – that control the opening of these major oceanic basins remain poorly studied. The interpretation of an extensive regional multichannel seismic dataset coupled with recent studies allows us to propose an accurate regional mapping of the crustal domains and major structural elements along the rifted margins along the whole eastern and south-eastern Africa. We provide new constraints on the structuration and evolution of these three transform systems. Although our findings indicate common features in transform style (e.g., a right-lateral transform system, a wide sheared corridor), the deformation and the thermal regime along these systems appear quite different. In particular, we show that the Davie and Agulhas Fracture Zones recorded spectacular inversions during the transform stage whereas transtensional deformation is observed along the Limpopo Fracture Zone during its activity. This suggests that faults activity controls vertical displacements along transform margins, minimising other processes such as thermal exchanges between the oceanic and continental lithospheres across the transform fault and flexural behaviour of the lithosphere. This different style of deformation may be explained by two main forcing parameters: (i) the ... Conference Object Antarc* Antarctica Institut National de la Recherche Agronomique: ProdINRA Corridor The ENVELOPE(78.139,78.139,-68.582,-68.582) Corridor, The ENVELOPE(78.139,78.139,-68.582,-68.582) |