2020 Fiscal Year Annual Research Report
Numerical simulations for the formation of dynamic decollement and subduction plate interface
| Project/Area Number |
18K13643
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| Research Institution | Japan Agency for Marine-Earth Science and Technology |
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Principal Investigator |
Bauville Arthur 国立研究開発法人海洋研究開発機構, 付加価値情報創生部門(数理科学・先端技術研究開発センター), 研究員 (90811498)
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Keywords | accretionary prism / critical taper theory / fault weakening / numerical simulations / metamorphism / geodynamics |
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| Outline of Annual Research Achievements |
During this project I elucidated some aspects of the mechanics of accretionary prisms and the formation of plate boundary fault. In Furuichi et al. (2018), we reavealed that stress patterns in granular media affect the dynamics of thrusting. In Bauville et al. (2020), we presented analytical solutions and numerical simulations that shed light on the formation of decollement faults.
The second part of the project, which treats of the dynamics of convergent tectonic zone was initially planned as a modeling study. However, I deviated from this initial goal as new interesting data became available. Thus, in Bauville and Yamato (2020), we proposed a new method of pressure-to-depth conversion for metamorphic rocks. Using the consensual pressure-to-depth conversion method, high-pressure metamorphic rocks are typically interpreted as having been buried down to a depth of 100-160 km, and then fastly exhumed to crustal depth. However, our new method reveals that pressure data can be equally well interpreted as burial to crustal depth under high differential stress condition, followed by a modification of the stress state at constant depth.
As part of this project I published two articles as a first-author and three articles as a collaborator. I also presented the results in national and international conferences (JpGU and EGU general meeting).
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