Effect of pressure on the strength of olivine at room temperature
| Autor: | Misha Bystricky, Frédéric Béjina, Jérémy Guignard, Wilson A. Crichton, Arnaud Proietti |
|---|---|
| Přispěvatelé: | Institut de recherche en astrophysique et planétologie (IRAP), Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), European Synchrotron Radiation Facility (ESRF) |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
010504 meteorology & atmospheric sciences Physics and Astronomy (miscellaneous) [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] Extrapolation Thermodynamics [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Activation energy Plasticity engineering.material 010502 geochemistry & geophysics 01 natural sciences Viscosity Rheology ComputingMilieux_MISCELLANEOUS 0105 earth and related environmental sciences Olivine Astronomy and Astrophysics Crystallography Geophysics Volume (thermodynamics) Space and Planetary Science [SDU]Sciences of the Universe [physics] Peierls stress engineering [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy |
| Zdroj: | Physics of the Earth and Planetary Interiors Physics of the Earth and Planetary Interiors, Elsevier, 2016, 259, pp.34-44. ⟨10.1016/j.pepi.2016.08.004⟩ |
| ISSN: | 0031-9201 |
| DOI: | 10.1016/j.pepi.2016.08.004⟩ |
| Popis: | A fine grained fully-dense olivine aggregate was deformed in a D-DIA press at room temperature and pressures ranging from 3.5 to 6.8 GPa, at constant strain rates between 6 × 10 - 6 and 2.2 × 10 - 5 s−1. A weighted non-linear least square fit of a dataset including our results and data from other high-pressure studies to a low-temperature plasticity flow law yields a Peierls stress σ P 0 = 7.4 ( 0.5 ) GPa and an activation energy E ∗ = 232 ( 60 ) kJ.mol−1. The dependence of the Peierls stress to pressure, σ P = σ P 0 ( 1 + 0.09 P ) , appears to be larger than the value predicted by the formulation proposed by Frost and Ashby (1982). With such a dependence, the activation volume is very small ( V * = 1.6 ( 1.7 ) cm3.mol−1). Extrapolation to natural conditions yields a viscosity of ~ 10 23 - 10 24 Pa.s for a cold subducting slab at depths of 50–100 km. |
| Databáze: | OpenAIRE |
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