Experimental study on syn-deformational reaction processes at high pressures: Implications for slab weakening and deep earthquakes
About this project
- Japan Grant Number
- JP18H05232
- Funding Program
- Grants-in-Aid for Scientific Research
- Funding organization
- Japan Society for the Promotion of Science
- Project/Area Number
- 18H05232
- Research Category
- Grant-in-Aid for Scientific Research (S)
- Allocation Type
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- Single-year Grants
- Review Section / Research Field
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- Broad Section B
- Research Institution
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- Kyushu University
- Project Period (FY)
- 2018-06-11 〜 2023-03-31
- Project Status
- Completed
- Budget Amount*help
- 140,920,000 Yen (Direct Cost: 108,400,000 Yen Indirect Cost: 32,520,000 Yen)
Research Abstract
Reaction-deformation coupling in deep rocks are potentially important processes to understand the plate-tectonic mantle convection in the Earth. We developed high-pressure deformation techniques with D-DIA and D-111 type multi-anvil devices, which enables us to conduct in-situ observations of the coupling processes up to lower mantle pressures combined with synchrotron radiation at PF-AR NE7A and SPring-8 BL04B1 beamlines. Based on these techniques, we clarified the processes of the reaction-induced shear instability and rheological weakening associated with the olivine-spinel and the post-spinel transformations. We also found that the two-stage post-spinel transformation and the post-garnet transformation have important roles on the slab rheology. These findings give a new perspective on deep slab dynamics including deep earthquakes, slab stagnation, and MORB segregation around the upper and lower mantle boundary.
Details 詳細情報について
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- CRID
- 1040282256971498368
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- Text Lang
- ja
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- Data Source
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- KAKEN
