Revisiting the structure, age, and evolution of the Wharton Basin to better understand subduction under Indonesia
International audience Understanding the subduction processes along the Sunda Trench requires detailed constraints on the subducting lithosphere. We build a detailed tectonic map of the Wharton Basin based on reinterpretation of satellite-derived gravity anomalies and marine magnetic anomalies. The...
Published in: | Journal of Geophysical Research: Solid Earth |
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ftsorbonneuniv:oai:HAL:insu-01309413v1 2024-05-19T07:29:33+00:00 Revisiting the structure, age, and evolution of the Wharton Basin to better understand subduction under Indonesia Jacob, Jensen Dyment, Jérôme Yatheesh, V Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) CSIR National Institute of Oceanography India (NIO) 2014 https://insu.hal.science/insu-01309413 https://insu.hal.science/insu-01309413/document https://insu.hal.science/insu-01309413/file/jgrb2014-119-169-jacob.pdf https://doi.org/10.1002/2013JB010285 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1002/2013JB010285 insu-01309413 https://insu.hal.science/insu-01309413 https://insu.hal.science/insu-01309413/document https://insu.hal.science/insu-01309413/file/jgrb2014-119-169-jacob.pdf doi:10.1002/2013JB010285 info:eu-repo/semantics/OpenAccess ISSN: 2169-9313 EISSN: 2169-9356 Journal of Geophysical Research : Solid Earth https://insu.hal.science/insu-01309413 Journal of Geophysical Research : Solid Earth, 2014, 119 (1), pp.169-190. ⟨10.1002/2013JB010285⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2014 ftsorbonneuniv https://doi.org/10.1002/2013JB010285 2024-05-02T02:10:15Z International audience Understanding the subduction processes along the Sunda Trench requires detailed constraints on the subducting lithosphere. We build a detailed tectonic map of the Wharton Basin based on reinterpretation of satellite-derived gravity anomalies and marine magnetic anomalies. The Wharton Basin is characterized by a fossil ridge, dated ~36.5 Ma, offset by N-S fracture zones. Magnetic anomalies 18 to 34 (38–84 Ma) are identified on both flanks, although a large part of the basin has been subducted. We analyze the past plate kinematic evolution of the Wharton Basin by two-plate (India-Australia) and three-plate (India-Australia-Antarctica) reconstructions. Despite the diffuse plate boundaries within the Indo-Australian plate for the last 20 Ma, we obtain finite rotation parameters that we apply to reconstruct the subducted Wharton Basin and constrain the thickness, buoyancy, and rheology of the subducting plate. The lower subductability of younger lithosphere off Sumatra has important consequences on the morphology, with a shallower trench, forearc islands, and a significant inward deviation of the subduction system. This deviation decreases in the youngest area, where the Wharton fossil spreading center enters subduction: The discontinuous magmatic crust and serpentinized upper mantle, consequences of the slow spreading rates at which this area was formed, weaken the mechanical resistance to subduction and facilitate the restoration of the accretionary prism. Deeper effects include the possible creation of asthenospheric windows beneath the Andaman Sea, in relation to the long-offset fracture zones, and east of 105°E, as a result of subduction of the spreading center. Article in Journal/Newspaper Antarc* Antarctica HAL Sorbonne Université Journal of Geophysical Research: Solid Earth 119 1 169 190 |
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Open Polar |
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HAL Sorbonne Université |
op_collection_id |
ftsorbonneuniv |
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English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] Jacob, Jensen Dyment, Jérôme Yatheesh, V Revisiting the structure, age, and evolution of the Wharton Basin to better understand subduction under Indonesia |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
description |
International audience Understanding the subduction processes along the Sunda Trench requires detailed constraints on the subducting lithosphere. We build a detailed tectonic map of the Wharton Basin based on reinterpretation of satellite-derived gravity anomalies and marine magnetic anomalies. The Wharton Basin is characterized by a fossil ridge, dated ~36.5 Ma, offset by N-S fracture zones. Magnetic anomalies 18 to 34 (38–84 Ma) are identified on both flanks, although a large part of the basin has been subducted. We analyze the past plate kinematic evolution of the Wharton Basin by two-plate (India-Australia) and three-plate (India-Australia-Antarctica) reconstructions. Despite the diffuse plate boundaries within the Indo-Australian plate for the last 20 Ma, we obtain finite rotation parameters that we apply to reconstruct the subducted Wharton Basin and constrain the thickness, buoyancy, and rheology of the subducting plate. The lower subductability of younger lithosphere off Sumatra has important consequences on the morphology, with a shallower trench, forearc islands, and a significant inward deviation of the subduction system. This deviation decreases in the youngest area, where the Wharton fossil spreading center enters subduction: The discontinuous magmatic crust and serpentinized upper mantle, consequences of the slow spreading rates at which this area was formed, weaken the mechanical resistance to subduction and facilitate the restoration of the accretionary prism. Deeper effects include the possible creation of asthenospheric windows beneath the Andaman Sea, in relation to the long-offset fracture zones, and east of 105°E, as a result of subduction of the spreading center. |
author2 |
Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) CSIR National Institute of Oceanography India (NIO) |
format |
Article in Journal/Newspaper |
author |
Jacob, Jensen Dyment, Jérôme Yatheesh, V |
author_facet |
Jacob, Jensen Dyment, Jérôme Yatheesh, V |
author_sort |
Jacob, Jensen |
title |
Revisiting the structure, age, and evolution of the Wharton Basin to better understand subduction under Indonesia |
title_short |
Revisiting the structure, age, and evolution of the Wharton Basin to better understand subduction under Indonesia |
title_full |
Revisiting the structure, age, and evolution of the Wharton Basin to better understand subduction under Indonesia |
title_fullStr |
Revisiting the structure, age, and evolution of the Wharton Basin to better understand subduction under Indonesia |
title_full_unstemmed |
Revisiting the structure, age, and evolution of the Wharton Basin to better understand subduction under Indonesia |
title_sort |
revisiting the structure, age, and evolution of the wharton basin to better understand subduction under indonesia |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://insu.hal.science/insu-01309413 https://insu.hal.science/insu-01309413/document https://insu.hal.science/insu-01309413/file/jgrb2014-119-169-jacob.pdf https://doi.org/10.1002/2013JB010285 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
ISSN: 2169-9313 EISSN: 2169-9356 Journal of Geophysical Research : Solid Earth https://insu.hal.science/insu-01309413 Journal of Geophysical Research : Solid Earth, 2014, 119 (1), pp.169-190. ⟨10.1002/2013JB010285⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2013JB010285 insu-01309413 https://insu.hal.science/insu-01309413 https://insu.hal.science/insu-01309413/document https://insu.hal.science/insu-01309413/file/jgrb2014-119-169-jacob.pdf doi:10.1002/2013JB010285 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2013JB010285 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
119 |
container_issue |
1 |
container_start_page |
169 |
op_container_end_page |
190 |
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1799479936125239296 |