Dynamics of the Ryukyu/Izu-Bonin-Marianas double subduction system
Trench motions represent the surface expression of the interaction between subducting plates and the underlying mantle, but the inherent dynamics are not fully understood. One interesting case is the migration of the Izu-Bonin-Marianas trench (IBM) that accommodates the subduction of the Pacific ben...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
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Elsevier BV
2020
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| Online Access: | https://hdl.handle.net/1721.1/125860 |
| _version_ | 1811089480990326784 |
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| author | Faccenna, Claudio Holt, Adam F. Becker, Thorsten W. Lallemand, Serge Royden, Leigh H |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Faccenna, Claudio Holt, Adam F. Becker, Thorsten W. Lallemand, Serge Royden, Leigh H |
| author_sort | Faccenna, Claudio |
| collection | MIT |
| description | Trench motions represent the surface expression of the interaction between subducting plates and the underlying mantle, but the inherent dynamics are not fully understood. One interesting case is the migration of the Izu-Bonin-Marianas trench (IBM) that accommodates the subduction of the Pacific beneath the Philippine Sea Plate (PSP), which is in turn subducting beneath the Eurasian plate along the Ryukyu trench. The history of the IBM trench is dominated by fast, episodic retreat from 40 to 15 Ma. However, around 10–5 Ma, the IBM trench reversed its motion from retreat to advance. The switch in trench motion occurred soon after the breakoff of the PSP slab along the Ryukyu trench and the onset of new subduction, and represents a fundamental change in the dynamics of the western Pacific subduction zones. Here, Following the modelling study of Čížková and Bina (2015), which suggested a link between IBM trench advance and Ryukyu subduction, we run 2-D numerical experiments to test the influence of a newly formed Ryukyu slab on the established IBM subduction zone, we run two-dimensional numerical experiments to test the influence of this newly formed Ryukyu slab on the IBM subduction zone. The results from our geodynamic model compare favourably with the reconstructed trend, indicating that the switch in trench motion along the IBM trench may indeed be related to the onset of a new subduction zone along the Ryukyu trench. Our analysis substantiates the idea that advancing trench motions in the western Pacific are due to the establishment of a double subduction system. Further analysis of such dynamics provides insights for the mechanisms controlling subducting plate and trench motions and mantle force transmission. |
| first_indexed | 2024-09-23T14:19:51Z |
| format | Article |
| id | mit-1721.1/125860 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T14:19:51Z |
| publishDate | 2020 |
| publisher | Elsevier BV |
| record_format | dspace |
| spelling | mit-1721.1/1258602022-09-29T08:46:46Z Dynamics of the Ryukyu/Izu-Bonin-Marianas double subduction system Faccenna, Claudio Holt, Adam F. Becker, Thorsten W. Lallemand, Serge Royden, Leigh H Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Trench motions represent the surface expression of the interaction between subducting plates and the underlying mantle, but the inherent dynamics are not fully understood. One interesting case is the migration of the Izu-Bonin-Marianas trench (IBM) that accommodates the subduction of the Pacific beneath the Philippine Sea Plate (PSP), which is in turn subducting beneath the Eurasian plate along the Ryukyu trench. The history of the IBM trench is dominated by fast, episodic retreat from 40 to 15 Ma. However, around 10–5 Ma, the IBM trench reversed its motion from retreat to advance. The switch in trench motion occurred soon after the breakoff of the PSP slab along the Ryukyu trench and the onset of new subduction, and represents a fundamental change in the dynamics of the western Pacific subduction zones. Here, Following the modelling study of Čížková and Bina (2015), which suggested a link between IBM trench advance and Ryukyu subduction, we run 2-D numerical experiments to test the influence of a newly formed Ryukyu slab on the established IBM subduction zone, we run two-dimensional numerical experiments to test the influence of this newly formed Ryukyu slab on the IBM subduction zone. The results from our geodynamic model compare favourably with the reconstructed trend, indicating that the switch in trench motion along the IBM trench may indeed be related to the onset of a new subduction zone along the Ryukyu trench. Our analysis substantiates the idea that advancing trench motions in the western Pacific are due to the establishment of a double subduction system. Further analysis of such dynamics provides insights for the mechanisms controlling subducting plate and trench motions and mantle force transmission. 2020-06-18T13:35:29Z 2020-06-18T13:35:29Z 2018-10 2017-08 2019-09-26T15:43:40Z Article http://purl.org/eprint/type/JournalArticle 0040-1951 https://hdl.handle.net/1721.1/125860 Faccenna, Claudio et al. "Dynamics of the Ryukyu/Izu-Bonin-Marianas double subduction system." Tectonophysics 746 (October 2018): 229-238 © 2017 Elsevier B.V. en http://dx.doi.org/10.1016/j.tecto.2017.08.011 Tectonophysics Creative Commons Attribution-NonCommercial-NoDerivs License http://creativecommons.org/licenses/by-nc-nd/4.0/ application/pdf Elsevier BV other univ website |
| spellingShingle | Faccenna, Claudio Holt, Adam F. Becker, Thorsten W. Lallemand, Serge Royden, Leigh H Dynamics of the Ryukyu/Izu-Bonin-Marianas double subduction system |
| title | Dynamics of the Ryukyu/Izu-Bonin-Marianas double subduction system |
| title_full | Dynamics of the Ryukyu/Izu-Bonin-Marianas double subduction system |
| title_fullStr | Dynamics of the Ryukyu/Izu-Bonin-Marianas double subduction system |
| title_full_unstemmed | Dynamics of the Ryukyu/Izu-Bonin-Marianas double subduction system |
| title_short | Dynamics of the Ryukyu/Izu-Bonin-Marianas double subduction system |
| title_sort | dynamics of the ryukyu izu bonin marianas double subduction system |
| url | https://hdl.handle.net/1721.1/125860 |
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