Understanding seismic heterogeneities in the lower mantle beneath the Americas from seismic tomography and plate tectonic history
International audience We combine results from seismic tomography and plate motion history to investigate slabs of subducted lithosphere in the lower mantle beneath the Americas. Using broadband waveform cross correlation, we measured 37,000 differential P and S traveltimes, 2000 PcP-P and ScS-S tim...
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Online Access: | https://hal.science/hal-00270442 https://hal.science/hal-00270442/document https://hal.science/hal-00270442/file/2005JB004154.pdf https://doi.org/10.1029/2005JB004154 |
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ftinsu:oai:HAL:hal-00270442v1 2023-06-18T03:35:47+02:00 Understanding seismic heterogeneities in the lower mantle beneath the Americas from seismic tomography and plate tectonic history Ren, Yong Stutzmann, Eléonore D. van Der Hilst, Robert Besse, Jean Institut de Physique du Globe de Paris (IPGP (UMR_7154)) Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) Department of Earth, Atmospheric and Planetary Sciences MIT, Cambridge (EAPS) Massachusetts Institute of Technology (MIT) 2007 https://hal.science/hal-00270442 https://hal.science/hal-00270442/document https://hal.science/hal-00270442/file/2005JB004154.pdf https://doi.org/10.1029/2005JB004154 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2005JB004154 hal-00270442 https://hal.science/hal-00270442 https://hal.science/hal-00270442/document https://hal.science/hal-00270442/file/2005JB004154.pdf doi:10.1029/2005JB004154 info:eu-repo/semantics/OpenAccess ISSN: 2169-9313 EISSN: 2169-9356 Journal of Geophysical Research : Solid Earth https://hal.science/hal-00270442 Journal of Geophysical Research : Solid Earth, 2007, 112 (B1), pp.B01302. ⟨10.1029/2005JB004154⟩ slabs seismic tomography lower mantle [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics info:eu-repo/semantics/article Journal articles 2007 ftinsu https://doi.org/10.1029/2005JB004154 2023-06-05T22:52:09Z International audience We combine results from seismic tomography and plate motion history to investigate slabs of subducted lithosphere in the lower mantle beneath the Americas. Using broadband waveform cross correlation, we measured 37,000 differential P and S traveltimes, 2000 PcP-P and ScS-S times along a wide corridor from Alaska to South America. We invert the data simultaneously to obtain P and S wave velocity models. We interpret slab structures and unravel subduction history by comparing our V S tomographic images with reconstructed plate motion from present-day up to 120 Myr. Convergence of the Pacific with respect to the Americas is computed using either (1) the Pacific and Indo-Atlantic hot spot reference frames or (2) the plate circuit passing through Antarctica. Around 800 km depth, four distinctive fast anomalies can be associated with subduction of the Nazca, Cocos, and Juan de Fuca plates beneath South, Central, and North America, respectively, and of the Pacific plate beneath the Aleutian island arc. The large fast anomalies in the lowermost mantle, which are most pronounced in the S wave models, can be associated with Late Cretaceous subduction of the Farallon plate beneath the Americas. Near 2000 km depth, the images record the post-80 Myr fragmentation of the proto-Farallon plate into the Kula plate in the north and the Farallon plate in the northeast. Near 1000 km depth, we infer separate fast anomalies interpreted as the Kula-Pacific, Juan de Fuca, and Farallon slabs. This interpretation is consistent with the volume and length of slabs estimated from the tomographic images and the plate history reconstruction. Article in Journal/Newspaper Aleutian Island Antarc* Antarctica Alaska Institut national des sciences de l'Univers: HAL-INSU Pacific Journal of Geophysical Research 112 B1 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
slabs seismic tomography lower mantle [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics |
spellingShingle |
slabs seismic tomography lower mantle [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics Ren, Yong Stutzmann, Eléonore D. van Der Hilst, Robert Besse, Jean Understanding seismic heterogeneities in the lower mantle beneath the Americas from seismic tomography and plate tectonic history |
topic_facet |
slabs seismic tomography lower mantle [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics |
description |
International audience We combine results from seismic tomography and plate motion history to investigate slabs of subducted lithosphere in the lower mantle beneath the Americas. Using broadband waveform cross correlation, we measured 37,000 differential P and S traveltimes, 2000 PcP-P and ScS-S times along a wide corridor from Alaska to South America. We invert the data simultaneously to obtain P and S wave velocity models. We interpret slab structures and unravel subduction history by comparing our V S tomographic images with reconstructed plate motion from present-day up to 120 Myr. Convergence of the Pacific with respect to the Americas is computed using either (1) the Pacific and Indo-Atlantic hot spot reference frames or (2) the plate circuit passing through Antarctica. Around 800 km depth, four distinctive fast anomalies can be associated with subduction of the Nazca, Cocos, and Juan de Fuca plates beneath South, Central, and North America, respectively, and of the Pacific plate beneath the Aleutian island arc. The large fast anomalies in the lowermost mantle, which are most pronounced in the S wave models, can be associated with Late Cretaceous subduction of the Farallon plate beneath the Americas. Near 2000 km depth, the images record the post-80 Myr fragmentation of the proto-Farallon plate into the Kula plate in the north and the Farallon plate in the northeast. Near 1000 km depth, we infer separate fast anomalies interpreted as the Kula-Pacific, Juan de Fuca, and Farallon slabs. This interpretation is consistent with the volume and length of slabs estimated from the tomographic images and the plate history reconstruction. |
author2 |
Institut de Physique du Globe de Paris (IPGP (UMR_7154)) Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) Department of Earth, Atmospheric and Planetary Sciences MIT, Cambridge (EAPS) Massachusetts Institute of Technology (MIT) |
format |
Article in Journal/Newspaper |
author |
Ren, Yong Stutzmann, Eléonore D. van Der Hilst, Robert Besse, Jean |
author_facet |
Ren, Yong Stutzmann, Eléonore D. van Der Hilst, Robert Besse, Jean |
author_sort |
Ren, Yong |
title |
Understanding seismic heterogeneities in the lower mantle beneath the Americas from seismic tomography and plate tectonic history |
title_short |
Understanding seismic heterogeneities in the lower mantle beneath the Americas from seismic tomography and plate tectonic history |
title_full |
Understanding seismic heterogeneities in the lower mantle beneath the Americas from seismic tomography and plate tectonic history |
title_fullStr |
Understanding seismic heterogeneities in the lower mantle beneath the Americas from seismic tomography and plate tectonic history |
title_full_unstemmed |
Understanding seismic heterogeneities in the lower mantle beneath the Americas from seismic tomography and plate tectonic history |
title_sort |
understanding seismic heterogeneities in the lower mantle beneath the americas from seismic tomography and plate tectonic history |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.science/hal-00270442 https://hal.science/hal-00270442/document https://hal.science/hal-00270442/file/2005JB004154.pdf https://doi.org/10.1029/2005JB004154 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Aleutian Island Antarc* Antarctica Alaska |
genre_facet |
Aleutian Island Antarc* Antarctica Alaska |
op_source |
ISSN: 2169-9313 EISSN: 2169-9356 Journal of Geophysical Research : Solid Earth https://hal.science/hal-00270442 Journal of Geophysical Research : Solid Earth, 2007, 112 (B1), pp.B01302. ⟨10.1029/2005JB004154⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2005JB004154 hal-00270442 https://hal.science/hal-00270442 https://hal.science/hal-00270442/document https://hal.science/hal-00270442/file/2005JB004154.pdf doi:10.1029/2005JB004154 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2005JB004154 |
container_title |
Journal of Geophysical Research |
container_volume |
112 |
container_issue |
B1 |
_version_ |
1769010384315875328 |