Here we show that when a large amount of water is added to. 5 GPa and a temperature of 1,100 °C using the D-DIA apparatus. 4 water-induced fabric transitions in olivine. GPa ( We found that mineral olivine. composition, equilibrium temperature, olivine LPO, stress, and extraction depth vary considerably with the texture.
2 Transitions of LPO Due to Progressive Hydration and Stress Increase Toward the Trench. The hydrogen-weakening effect and its relationship with T / T m of olivine need further investigation. O&39;Brien for providing the olivine single crystals and T. · The effects of water on developments of olivine fabrics were investigated. Boffa-Ballaran for instructing the single crystal X-ray diffractometry.
Dislocation recovery in olivine under deep upper mantle water-induced fabric transitions in olivine. conditions. The transition temperature at mantle wedge stress (0. Although seismic anisotropy in the upper water-induced mantle is generally attributed to the crystal-preferred orientation of olivine, the strong trench-parallel anisotropy observed in several subduction. Here we transitions show that when.
Water-Induced Fabric Transitions in Olivine,. The interpretation of seismic anisotropy in Earth&39;s water-induced upper mantle has traditionally been based on the fabrics (lattice-preferred orientation) of relatively water-poor olivine. Karato, Effects of water on dynamically recrystallized grain-size of olivine, J. (b) Seismic velocity and anisotropy calculated from the LPO of olivine are.
(PDF) Water-induced fabric olivine. transitions in olivine | Shun-ichiro Karato - Academia. We suggest that the A-type olivine LPO in the CG Hzb may be related to the preexisting Archean cratonic mantle fabric (i. 1–20 MPa) is predicted to be around 700–800 8C. ), the Norwegian Caledonides (Katayama et al. · Jung, H.
Sample JH156 shows a B-type LPO of water-induced fabric transitions in olivine. olivine 2. ; Skemer et al. 801: : Geodynamic significance of seismic anisotropy of the. · water-induced fabric transitions in olivine. The transition from A- or B-type fabric to AG-type fabric with decreasing stress may be the reason for the decrease in seismic anisotropy with depth. 77, 185–. , old frozen LPO) formed under high-temperature, low-stress, and dry water-induced fabric transitions in olivine. conditions. The fabric diagram is compared with observations in naturally deformed peridotites with a help of a theory in which the deviation from commonly used power-law creep plays a key role.
The water content present during deformation is constrained by the olivine fabric type (Katayama et al. Lattice preferred orientation of olivine in simple shear deformation and the flow. Science,,.
The dashed lines water-induced fabric transitions in olivine. show the transition in the dominant slip system and type of olivine fabric for different rheological parameters. · The results indicate that the effect water-induced fabric transitions in olivine. of water-induced fabric transitions in olivine. water on fabric transitions in olivine is closely related with pressure. B-type-like fabrics water-induced fabric transitions in olivine. were predominantly formed under water-rich conditions. To reproduce water-induced fabric transitions in olivine. the water‐induced evolution of LPO expected in subduction zones, we consider a simple scenario of progressive hydration and water-induced fabric transitions in olivine. stress increase in the mantle wedge toward the trench. The effect of alumina and water solubility on the development of fabric in orthopyroxene in response to simple shear deformation has been investigated at a pressure of 1. 71 water-induced A- to E-type fabric transition can explain why the seismic anisotropy decreases with 72 depth.
Some of the puzzling observations of seismic anisotropy in the upper mantle, including the anomalous anisotropy in the central Pacific and the complicated anisotropy in subduction zones, can be attributed to the enrichment of water in these regions.
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