Experimental grain size-sensitive flow of hot-pressed Brazilian quartz aggregates

Rutter, E. H.; Brodie, K. H.

doi:10.1016/j.jsg.2004.04.006

Cited by 140 publications

(116 citation statements)

References 27 publications

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“…6C, which shows strength profiles calculated using constitutive equations for dislocation-controlled creep of wet quartzite in the upper crust (Rutter and Brodie, 2004) and wet feldspar in the lower crust (Rybacki and Dresen, 2000). The strength profiles are bounded by a linear frictional failure criterion for thrust faults calculated for hydrostatic pore fluid pressure (Sibson, 1974), but the same criterion for pore fluid pressure that is a fraction (λ v = 0.75) of lithostatic pressure is also indicated.…”

Section: Discussionmentioning

confidence: 99%

Localization of intraplate deformation through fluid-assisted faulting in the lower-crust: The Flinders Ranges, South Australia

et al. 2015

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Section: Discussionmentioning

confidence: 99%

Localization of intraplate deformation through fluid-assisted faulting in the lower-crust: The Flinders Ranges, South Australia

et al. 2015

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“…It tends to overestimate the strength for low volume fractions 340 (<40%) of the stronger phase (Dimanov and Dresen, 2005 (Rutter and Brodie, 2004). An important alternative process of diffusion creep in a 348 granitic mylonite at low or moderate temperatures is likely to be water-assisted diffusion 349 of silica along grain-boundaries and fractures (den Brok, 1998;Farver and Yund, 2000).…”

Section: Flow Law For a Mylonitic Granitoidmentioning

confidence: 99%

Rheology of two-phase systems: A microphysical and observational approach

Platt

2015

Journal of Structural Geology

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Please cite this article as: Platt, J.P., Rheology of two-phase systems: A microphysical and observational approach, Journal of Structural Geology (2015), Abstract 1 Ductile shear zones commonly contain distinctive bands of high strain rock characterized 2 by intimately mixed fine-grained two-phase or polyphase material. These ultramylonite 3 bands are weaker than the surrounding material, and may play a critical role in strain 4 localization. How such zones develop, how the phases become evenly dispersed, the bulk 5 rheology, and the controls on grain size, are all unclear. The following generic scenario 6 may resolve some of these questions. 7

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“…12), suggesting that other factors may be influencing the orientation of the rotation angles; such as the activity of multiple or paired slip systems, changes caused by GBM mechanisms, and/or a component of grain size sensitive flow (e.g. grain boundary sliding; Rutter and Brodie, 2004).…”

Section: Quartz Cpo Data and Ipf Plots Of Misorientation Rotation Axesmentioning

confidence: 99%

Recrystallization fabrics of sheared quartz veins with a strong pre-existing crystallographic preferred orientation from a seismogenic shear zone

et al. 2016

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Microstructural investigations were carried out on quartz veins in schist, protomylonite, and mylonite samples from an ancient seismogenic strike-slip shear zone (Sandhill Corner shear zone, Norumbega fault system, Maine, USA). We interpret complexities in the microstructural record to show that: (1) pre-existing crystallographic preferred orientations (CPO) in the host rock may persist in the new CPO patterns of the shear zone and (2) the inner and outer parts of the shear zone followed diverging paths of fabric development. The host rocks bounding the shear zone contain asymmetrically-folded quartz veins with a strong CPO. These veins are increasingly deformed and recrystallized with proximity to the shear zone core. Matrixaccommodated rotation and recrystallization may position an inherited c-axis maximum in an orientation coincident with rhomb baN or basal baN slip. This inherited CPO likely persists in the shear zone fabric as a higher concentration of poles in one hemisphere of the c-axis pole figure, leading to asymmetric crossed girdle or paired maxima c-axis patterns about the foliation plane. Three observed quartz grain types indicate a general trend of localization with decreasing temperature: (1) large (N 100 μm), low aspect ratio (b~5) and (2) high aspect ratio (~5-20) grains overprinted by (3) smaller (b~80 μm), low aspect ratio (b~4) grains through subgrain rotation-dominated recrystallization. In the outer shear zone, subgrain rotation recrystallization led to a well-developed c-axis crossed girdle pattern. In the inner shear zone, the larger grains are completely overprinted by smaller grains, but the CPO patterns are relatively poorly developed and are associated with distinctively different misorientation angle histogram profiles ("flat" neighbor-pair profile with similar number fraction for angles from 10 to 90°). This may reflect the preferential activation of grain size sensitive deformation processes in the inner-most part of the shear zone where transient deformation associated with the seismic cycle may have localized.

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Experimental grain size-sensitive flow of hot-pressed Brazilian quartz aggregates

Cited by 140 publications

References 27 publications

Localization of intraplate deformation through fluid-assisted faulting in the lower-crust: The Flinders Ranges, South Australia

Localization of intraplate deformation through fluid-assisted faulting in the lower-crust: The Flinders Ranges, South Australia

Rheology of two-phase systems: A microphysical and observational approach

Recrystallization fabrics of sheared quartz veins with a strong pre-existing crystallographic preferred orientation from a seismogenic shear zone

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