Evolution of 3-D subduction-induced mantle flow around lateral slab edges in analogue models of free subduction analysed by stereoscopic particle image velocimetry technique
We present analogue models of free subduction in which we investigate the three-dimensional (3-D) subduction-induced mantle flow focusing around the slab edges. We use a stereoscopic Particle Image Velocimetry (sPIV) technique to map the 3-D mantle flow on 4 vertical cross-sections for one experimen...
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2014
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Online Access: | https://research.vu.nl/en/publications/1251e6df-3def-4db6-9ed5-19bfba856576 https://doi.org/10.1016/j.epsl.2014.07.007 http://hdl.handle.net/1871.1/1251e6df-3def-4db6-9ed5-19bfba856576 http://www.scopus.com/inward/record.url?scp=84905373449&partnerID=8YFLogxK http://www.scopus.com/inward/citedby.url?scp=84905373449&partnerID=8YFLogxK |
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ftvuamstcris:oai:research.vu.nl:publications/1251e6df-3def-4db6-9ed5-19bfba856576 2023-05-15T16:59:28+02:00 Evolution of 3-D subduction-induced mantle flow around lateral slab edges in analogue models of free subduction analysed by stereoscopic particle image velocimetry technique Strak, Vincent Schellart, Wouter P. 2014-10-01 https://research.vu.nl/en/publications/1251e6df-3def-4db6-9ed5-19bfba856576 https://doi.org/10.1016/j.epsl.2014.07.007 http://hdl.handle.net/1871.1/1251e6df-3def-4db6-9ed5-19bfba856576 http://www.scopus.com/inward/record.url?scp=84905373449&partnerID=8YFLogxK http://www.scopus.com/inward/citedby.url?scp=84905373449&partnerID=8YFLogxK eng eng info:eu-repo/semantics/restrictedAccess Strak , V & Schellart , W P 2014 , ' Evolution of 3-D subduction-induced mantle flow around lateral slab edges in analogue models of free subduction analysed by stereoscopic particle image velocimetry technique ' , Earth and Planetary Science Letters , vol. 403 , pp. 368-379 . https://doi.org/10.1016/j.epsl.2014.07.007 Analogue models Mantle flow Slab edges Stereoscopic PIV Subduction article 2014 ftvuamstcris https://doi.org/10.1016/j.epsl.2014.07.007 2022-01-17T13:29:24Z We present analogue models of free subduction in which we investigate the three-dimensional (3-D) subduction-induced mantle flow focusing around the slab edges. We use a stereoscopic Particle Image Velocimetry (sPIV) technique to map the 3-D mantle flow on 4 vertical cross-sections for one experiment and on 3 horizontal depth-sections for another experiment. On each section the in-plane components are mapped as well as the out-of-plane component for several experimental times. The results indicate that four types of maximum upwelling are produced by the subduction-induced mantle flow. The first two are associated with the poloidal circulation occurring in the mantle wedge and in the sub-slab domain. A third type is produced by horizontal motion and deformation of the frontal part of the slab lying on the 660 km discontinuity. The fourth type results from quasi-toroidal return flow around the lateral slab edges, which produces a maximum upwelling located slightly laterally away from the sub-slab domain and can have another maximum upwelling located laterally away from the mantle wedge. These upwellings occur during the whole subduction process. In contrast, the poloidal circulation in the mantle wedge produces a zone of upwelling that is vigorous during the free falling phase of the slab sinking but that decreases in intensity when reaching the steady-state phase. The position of the maximum upward component and horizontal components of the mantle flow velocity field has been tracked through time. Their time-evolving magnitude is well correlated to the trench retreat rate. The maximum upwelling velocity located laterally away from the subducting plate is ~18-24% of the trench retreat rate during the steady-state subduction phase. It is observed in the mid upper mantle but upwellings are produced throughout the whole upper mantle thickness, potentially promoting decompression melting. It could thereby provide a source for intraplate volcanism, such as Mount Etna in the Mediterranean, the Chiveluch group of volcanoes in Kamchatka and the Samoan hotspot near Tonga. Article in Journal/Newspaper Kamchatka Vrije Universiteit Amsterdam (VU): Research Portal Tonga ENVELOPE(7.990,7.990,63.065,63.065) Earth and Planetary Science Letters 403 368 379 |
institution |
Open Polar |
collection |
Vrije Universiteit Amsterdam (VU): Research Portal |
op_collection_id |
ftvuamstcris |
language |
English |
topic |
Analogue models Mantle flow Slab edges Stereoscopic PIV Subduction |
spellingShingle |
Analogue models Mantle flow Slab edges Stereoscopic PIV Subduction Strak, Vincent Schellart, Wouter P. Evolution of 3-D subduction-induced mantle flow around lateral slab edges in analogue models of free subduction analysed by stereoscopic particle image velocimetry technique |
topic_facet |
Analogue models Mantle flow Slab edges Stereoscopic PIV Subduction |
description |
We present analogue models of free subduction in which we investigate the three-dimensional (3-D) subduction-induced mantle flow focusing around the slab edges. We use a stereoscopic Particle Image Velocimetry (sPIV) technique to map the 3-D mantle flow on 4 vertical cross-sections for one experiment and on 3 horizontal depth-sections for another experiment. On each section the in-plane components are mapped as well as the out-of-plane component for several experimental times. The results indicate that four types of maximum upwelling are produced by the subduction-induced mantle flow. The first two are associated with the poloidal circulation occurring in the mantle wedge and in the sub-slab domain. A third type is produced by horizontal motion and deformation of the frontal part of the slab lying on the 660 km discontinuity. The fourth type results from quasi-toroidal return flow around the lateral slab edges, which produces a maximum upwelling located slightly laterally away from the sub-slab domain and can have another maximum upwelling located laterally away from the mantle wedge. These upwellings occur during the whole subduction process. In contrast, the poloidal circulation in the mantle wedge produces a zone of upwelling that is vigorous during the free falling phase of the slab sinking but that decreases in intensity when reaching the steady-state phase. The position of the maximum upward component and horizontal components of the mantle flow velocity field has been tracked through time. Their time-evolving magnitude is well correlated to the trench retreat rate. The maximum upwelling velocity located laterally away from the subducting plate is ~18-24% of the trench retreat rate during the steady-state subduction phase. It is observed in the mid upper mantle but upwellings are produced throughout the whole upper mantle thickness, potentially promoting decompression melting. It could thereby provide a source for intraplate volcanism, such as Mount Etna in the Mediterranean, the Chiveluch group of volcanoes in Kamchatka and the Samoan hotspot near Tonga. |
format |
Article in Journal/Newspaper |
author |
Strak, Vincent Schellart, Wouter P. |
author_facet |
Strak, Vincent Schellart, Wouter P. |
author_sort |
Strak, Vincent |
title |
Evolution of 3-D subduction-induced mantle flow around lateral slab edges in analogue models of free subduction analysed by stereoscopic particle image velocimetry technique |
title_short |
Evolution of 3-D subduction-induced mantle flow around lateral slab edges in analogue models of free subduction analysed by stereoscopic particle image velocimetry technique |
title_full |
Evolution of 3-D subduction-induced mantle flow around lateral slab edges in analogue models of free subduction analysed by stereoscopic particle image velocimetry technique |
title_fullStr |
Evolution of 3-D subduction-induced mantle flow around lateral slab edges in analogue models of free subduction analysed by stereoscopic particle image velocimetry technique |
title_full_unstemmed |
Evolution of 3-D subduction-induced mantle flow around lateral slab edges in analogue models of free subduction analysed by stereoscopic particle image velocimetry technique |
title_sort |
evolution of 3-d subduction-induced mantle flow around lateral slab edges in analogue models of free subduction analysed by stereoscopic particle image velocimetry technique |
publishDate |
2014 |
url |
https://research.vu.nl/en/publications/1251e6df-3def-4db6-9ed5-19bfba856576 https://doi.org/10.1016/j.epsl.2014.07.007 http://hdl.handle.net/1871.1/1251e6df-3def-4db6-9ed5-19bfba856576 http://www.scopus.com/inward/record.url?scp=84905373449&partnerID=8YFLogxK http://www.scopus.com/inward/citedby.url?scp=84905373449&partnerID=8YFLogxK |
long_lat |
ENVELOPE(7.990,7.990,63.065,63.065) |
geographic |
Tonga |
geographic_facet |
Tonga |
genre |
Kamchatka |
genre_facet |
Kamchatka |
op_source |
Strak , V & Schellart , W P 2014 , ' Evolution of 3-D subduction-induced mantle flow around lateral slab edges in analogue models of free subduction analysed by stereoscopic particle image velocimetry technique ' , Earth and Planetary Science Letters , vol. 403 , pp. 368-379 . https://doi.org/10.1016/j.epsl.2014.07.007 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.epsl.2014.07.007 |
container_title |
Earth and Planetary Science Letters |
container_volume |
403 |
container_start_page |
368 |
op_container_end_page |
379 |
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1766051747797663744 |