Journal Article10.1524/ZPCH.1998.207.PART_1_2.147
Diffusion of hydrogen and intrinsic point defects in olivine
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TL;DR: In this paper, the authors analyzed the kinetics of hydrogen diffusion in ferromagnesian olivine by measuring the H distribution in single crystals annealed under hydrothermal conditions.
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Abstract: We have analyzed the kinetics of hydrogen diffusion in ferromagnesian olivine by measuring the —H distribution in single crystals annealed under hydrothermal conditions. The hydrogen concentration evolves toward an equilibrium value in two stages. First, hydrogen diffuses rapidly (DH = 10\"10 m2/s at 1000 °C) into olivine probably charge compensated by a flux of polarons or of electrons. The resultant metastable equilibrium concentration of hydrogen is directly related to the imposed hydrogen fugacity and to the preexisting concentration of intrinsic point defects; except for electronic species, intrinsic defects diffuse significantly more slowly than hydrogen. Second, hydrogen and intrinsic point defects such as metal vacancies diffuse more slowly (DVMl = 10 12 m2/s at 1000 °C) into or out of the olivine as the concentrations of all defect species evolve toward equilibrium with the imposed thermochemical environment.
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Citations
Rheology of the Upper Mantle and the Mantle Wedge: A View from the Experimentalists
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TL;DR: In this paper, the authors provide a critical review of flow law parameters for olivine aggregates and single crystals deformed in the diffusion creep and dislocation creep regimes under both wet and dry conditions.
Influence of water on plastic deformation of olivine aggregates 2. Dislocation creep regime
S. Mei,David L. Kohlstedt +1 more
TL;DR: In this article, the authors investigated the effect of water fugacity on the creep behavior of olivine aggregates in the dislocation creep regime and concluded that water influences creep rate primarily through its effect on the concentrations of intrinsic point defects and hence on ionic diffusion and dislocation climb.
777
Building and Destroying Continental Mantle
TL;DR: In this paper, the authors show that continents are underlain by highly melt-depleted peridotites, which result in a chemically distinct boundary layer that is intrinsically buoyant and strong (owing to dehydration).
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The effect of water on the electrical conductivity of olivine
TL;DR: In this paper, the electrical conductivity of synthetic polycrystalline olivine was determined from a.c. impedance measurements at a pressure of 4 GPa for a temperature range of 873-1,273 K for water contents of 0.01-0.08 wt%.
377
Rapid reequilibration of H2O and oxygen fugacity in olivine-hosted melt inclusions
TL;DR: In this paper, it was shown that, contrary to the widely held view, H 2 O loss or gain in melt inclusions is not limited by redox reactions and significant fluxes of H + through the host olivine are possible on very short time scales.
339
References
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TL;DR: In this paper, the solubility of hydroxyl in the α, β and γ phases of (Mg,Fe)2SiO4 was investigated by hydrothermally annealing single crystals of San Carlos olivine.
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Rheology of synthetic olivine aggregates: Influence of grain size and water
TL;DR: In this paper, the influence of grain size and water content on the high-temperature plasticity of olivine aggregates was studied, using a gas medium high-pressure deformation apparatus.
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The role of water in the deformation of dunite
P. N. Chopra,M. S. Paterson +1 more
TL;DR: In this article, the authors show that for a given rock, flow stress can be correlated with the intensity of a residual water-related broad absorption, and that the amount of water that has been found to be of importance for the strength of these dunites are of the order of 0.01 wt %, amounts much less than most estimates of the water content of the earth's undepleted upper mantle.
534
Diffusion of hydrogen in olivine: Implications for water in the mantle
TL;DR: In this article, single crystals from San Carlos in Arizona have been annealed at temperatures between 800° and 1000°C under hydrothermal conditions at a confining pressure of 300 MPa.
457
The role of water in the deformation of olivine single crystals
TL;DR: In this article, the diffusion coefficients for the hydroxyl species giving rise to the sharp band and broadband features in the infrared spectrum of hydrothermally treated olivine have been determined to be greater than 10−10 m2 s−1 under all pressure and temperature conditions tested.
443