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Showing 1 to 8 of 8 for “"Diffusion creep"”.
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Silicon and oxygen self-diffusion in forsterite and implications to upper-mantle rheology
(1) Silicon lattice diffusion coefficient in dry forsterite The high temperature creep of olivine is believed to be controlled by self-diffusion of olivine. However, the experimentally measured silicon diffusion coefficients (DSi) [Dohmen et al., 2002; Jaoul et al., 1981] were about 2-3 orders of …
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Deformation Mechanisms and Strain Localization in the Mafic Continental Lower Crust
… matrix. This fine-grained mixture deforms by diffusion creep, causing significant rheological weakening. Case-study 2 investigates a lower crustal shear zone in a compositionally-layered mafic complex made of amphibole-rich and amphibole-poor metagabbros. Findings of case-study 2 show that …
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Plagioclase preferred orientation in layered mylonites : evaluation of flow laws for the lower crust
… LPOs indicating they deform by dislocation creep. Plagioclase grain size in mixed plagioclase-pyroxene mylonite layers is finer than in pure plagioclase layers, and depends on the size and proportion of pyroxenes. Progressive mixing of pyroxene and plagioclase within gabbro mylonite layers …
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Plagioclase preferred orientation in the layered mylonites : evaluation of flow laws for the lower crust
… LPOs indicating they deform by dislocation creep. Plagioclase grain size in mixed plagioclase-pyroxene mylonite layers is finer than in pure plagioclase layers, and depends on the size and proportion of pyroxenes. Progressive mixing of pyroxene and plagioclase within gabbro mylonite layers …
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Structural analysis of the Paint Lake Deformation Zone, Northern Ontario /
… deformation mechanism from dislocation creep to diffusion creep is observed with increasing strain during mylonitization. C'-fabric development is temporally associated with this change. A decrease in the angular relationship between C- and C'-fabrics is observed upon attaining maximum …
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Simulation of creep in nickel based single crystal superalloys
… of their superior high-temperature strength and creep properties as compared to the other materials. This is due to two factors: solid solution and precipitation strengthening of the gamma ([gamma]) and gamma prime ([gamma]') phases, and the elimination of grain boundaries. Creep of Nickel based …
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Field and theoretical investigations of strain localization: Effects of mineralogy, shear heating and grain size evolution on deformation in the Earth
… viscoelastic rheology that includes dislocation creep, diffusion creep, dislocation accommodated grain boundary sliding (disGBS) and low temperature plasticity (LTP). We have found that increasing either the applied strain rate or the grain size system behavior is modified in three significant …
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Rheological response to tectonic and volcanic deformation in Iceland
… The models also account for dislocation, diffusion, and composite (the combined effect of dislocation and diffusion) in both wet and dry conditions. The 700°C isotherm is applied for long term brittle-ductile transition. Rheological responses differ in horizontal and vertical directions. …