Pressure dependence of olivine grain growth at upper mantle conditions
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arXiv
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| Hauptverfasser: | , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866917982566875136 |
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| author | Ferreira, Filippe Thielmann, Marcel Farla, Robert Koizumi, Sanae Marquardt, Katharina Tinka |
| author_facet | Ferreira, Filippe Thielmann, Marcel Farla, Robert Koizumi, Sanae Marquardt, Katharina Tinka |
| contents | The grain size of olivine influences mass and heat flux in Earth's upper mantle. We performed annealing experiments on synthetic olivine-pyroxene aggregates (6-13 vol.%) at 1-12 GPa and 1323-1793 K. Grain-size analysis via EBSD reveal an activation volume of $4.8 \times 10^{-6}\ \mathrm{m}^3/\mathrm{mol}$, matching silicon grain-boundary diffusion values. This suggests pressure-driven reduction in olivine growth rates may offset temperature effects at depth, enabling grain-size-sensitive creep at shallower mantle depths than previously modeled. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_08425 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Pressure dependence of olivine grain growth at upper mantle conditions Ferreira, Filippe Thielmann, Marcel Farla, Robert Koizumi, Sanae Marquardt, Katharina Tinka Geophysics Materials Science The grain size of olivine influences mass and heat flux in Earth's upper mantle. We performed annealing experiments on synthetic olivine-pyroxene aggregates (6-13 vol.%) at 1-12 GPa and 1323-1793 K. Grain-size analysis via EBSD reveal an activation volume of $4.8 \times 10^{-6}\ \mathrm{m}^3/\mathrm{mol}$, matching silicon grain-boundary diffusion values. This suggests pressure-driven reduction in olivine growth rates may offset temperature effects at depth, enabling grain-size-sensitive creep at shallower mantle depths than previously modeled. |
| title | Pressure dependence of olivine grain growth at upper mantle conditions |
| topic | Geophysics Materials Science |
| url | https://arxiv.org/abs/2504.08425 |