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• W2801432959 abstract "Abstract Hot‐pressed polycrystalline quartz samples with grain sizes of 1.7–12.0 μm and water contents of 3,500 ppm H/Si were deformed in a solid‐pressure‐medium (Griggs‐type) deformation apparatus at temperatures of 600 to 950°C, confining pressures of 0.9 to 1.5 GPa and strain rates of 10 −3.3 to 10 −5.9 /s. Two different flow regimes are distinguished at low and high temperatures. The stress exponent determined at low temperatures (600–750°C) increased from 2.9 to 5.2 with an activation energy of 129 ± 33 kJ/mol, consistent with previous quartz dislocation creep laws indicating operation of dislocation creep. In contrast, the stress exponent determined at high temperatures (800–950°C) is 1.7 ± 0.2 with an activation energy of 183 ± 25 kJ/mol. A fugacity exponent determined at 800°C was 1.0 ± 0.2. All samples show evidence of basal < a > slip. However, flow strengths at high temperatures also depend on grain size with a small grain size exponent of 0.51 ± 0.13. Mechanical, microstructural, and textural results suggest that deformation occurs by a combination of intracrystalline and grain boundary processes. The flow law determined from the high‐temperature data can be fit by with stress, σ in MPa, grain size, d in μm, in MPa, and T k in Kelvin. At conditions of the middle crust and tectonic strain rates, deformation depends on grain size where the strength is weaker than for pure dislocation creep even for grain sizes >10 μm." @default.
• W2801432959 created "2018-05-17" @default.
• W2801432959 creator A5010770362 @default.
• W2801432959 creator A5073122389 @default.
• W2801432959 creator A5080536566 @default.
• W2801432959 date "2018-06-01" @default.
• W2801432959 modified "2023-10-13" @default.
• W2801432959 title "Deformation of Fine‐Grained Quartz Aggregates by Mixed Diffusion and Dislocation Creep" @default.
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• W2801432959 doi "https://doi.org/10.1029/2017jb015133" @default.
• W2801432959 hasPublicationYear "2018" @default.
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