Rheological and microstructural evolution of Carrara marble with high shear strain: results from high temperature torsion experiments

Pieri, M.; Burlini, L.; Kunze, Karsten; Stretton, I. C.; Olgaard, David L.

doi:10.1016/s0191-8141(01)00006-2

Cited by 148 publications

(110 citation statements)

References 35 publications

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“…7d). Similar CPO patterns were obtained by Pieri et al (2001a) in torsion tests on solid Carrara marble at similar temperature conditions. Bulk shear strains in the Pieri et al experiments that were more than one order of magnitude larger but comparable to the local shear strains at inclusion tips.…”

Section: Deformation Mechanisms and Fabric Evolution At The Tip Of Wesupporting

confidence: 69%

“…MPa, quite similar to that measured by Pieri et al (2001a) on Carrara marble in high strain torsion tests at 927°C temperature and a strain rate of 3x10 -4 s -1 . One sample (CMHT1) showed an oscillating stress at high strain.…”

Section: Mechanical Behaviorsupporting

confidence: 67%

“…Bulk shear strains in the Pieri et al experiments that were more than one order of magnitude larger but comparable to the local shear strains at inclusion tips. The CPO measured ahead of the inclusions in highly deformed samples shows a typical pattern for finegrained dynamically recrystallized calcite as observed in many studies of naturally and experimentally deformed calcite mylonites (e.g., Austin et al, 2008, Behrmann, 1983Barnhoorn et al, 2004;Bestmann and Prior, 2003;Bruijn et al, 2011;Ebert et al, 2007a;Herwegh and Kunze, 2002;Pieri et al, 2001a;Pieri et al, 2001b;Schmid et al, 1987). These patterns have been attributed to grain boundary migration recrystallization (GBMR) (Schmid et al, 1987, Pieri et al, 2001aPieri et al, 2001b).…”

Section: Deformation Mechanisms and Fabric Evolution At The Tip Of Wementioning

confidence: 81%

“…7b) (Barnhoorn et al, 2004;Pieri et al, 2001a). However, CPO patterns do not allow identifying active slip systems.…”

Section: Deformation Mechanisms and Fabric Evolution At The Tip Of Wementioning

confidence: 99%

“…for Carrara marble twisted at T = 927°C and 727°C, respectively (Barnhoorn et al, 2004;Pieri et al, 2001a). At a shear stress of about 20 MPa (vertical dotted line in Fig.…”

Section: Mechanical Behaviormentioning

confidence: 99%

See 4 more Smart Citations

Strain localization during high temperature creep of marble: The effect of inclusions

et al. 2014

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The deformation of rocks in the Earth's middle and lower crust is often localized in ductile shear zones. To better understand the initiation and propagation of high-temperature shear zones induced by the presence of structural and material heterogeneities, we performed deformation experiments in the dislocation creep regime on Carrara marble samples containing weak (limestone) or strong (novaculite) second phase inclusions. The samples were mostly deformed in torsion at a bulk shear strain rate of ≈ 1.9x10 -4 s -1 to bulk shear strains γ between 0.02 and 2.9 using a Paterson-type gas deformation apparatus at 900°C temperature and 400 MPa confining pressure. At low strain, twisted specimens with weak inclusions show minor strain hardening that is replaced by strain weakening at γ > 0.1 -0.2.Peak shear stress at the imposed conditions is about 20 MPa, which is ≈8% lower than the strength of intact samples. Strain progressively localized within the matrix with increasing bulk strain, but decayed rapidly with increasing distance from the inclusion tip.Microstructural analysis shows twinning and recrystallization within this process zone, with a strong crystallographic preferred orientation, dominated by {r} and (c) slip in .Recrystallization-induced weakening starts at local shear strain of about 1 in the process zone, corresponding to a bulk shear strain of about 0.1. In contrast, torsion of a sample containing strong inclusions deformed at similar stress as inclusion-free samples but do not show localization. The experiments demonstrate that the presence of weak heterogeneities initiates localized creep at local stress concentrations around the inclusion tips. Recrystallizationinduced grain size reduction may only locally promote grain boundary diffusion creep. Accordingly, the bulk strength of the twisted aggregate is close to or slightly below the lower (isostress) strength bound, determined from the flow strength and volume fraction of matrix and inclusions.

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Section: Deformation Mechanisms and Fabric Evolution At The Tip Of Wesupporting

confidence: 69%

Section: Mechanical Behaviorsupporting

confidence: 67%

Section: Deformation Mechanisms and Fabric Evolution At The Tip Of Wementioning

confidence: 81%

“…7b) (Barnhoorn et al, 2004;Pieri et al, 2001a). However, CPO patterns do not allow identifying active slip systems.…”

Section: Deformation Mechanisms and Fabric Evolution At The Tip Of Wementioning

confidence: 99%

“…for Carrara marble twisted at T = 927°C and 727°C, respectively (Barnhoorn et al, 2004;Pieri et al, 2001a). At a shear stress of about 20 MPa (vertical dotted line in Fig.…”

Section: Mechanical Behaviormentioning

confidence: 99%

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Strain localization during high temperature creep of marble: The effect of inclusions

et al. 2014

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From transient to steady state deformation and grain size: A thermodynamic approach using elasto-visco-plastic numerical modeling

Herwegh

Poulet

Karrech

et al. 2014

J. Geophys. Res. Solid Earth

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Numerical simulation experiments give insight into the evolving energy partitioning during high-strain torsion experiments of calcite. Our numerical experiments are designed to derive a generic macroscopic grain size sensitive flow law capable of describing the full evolution from the transient regime to steady state. The transient regime is crucial for understanding the importance of microstructural processes that may lead to strain localization phenomena in deforming materials. This is particularly important in geological and geodynamic applications where the phenomenon of strain localization happens outside the time frame that can be observed under controlled laboratory conditions. Our method is based on an extension of the paleowattmeter approach to the transient regime. We add an empirical hardening law using the Ramberg-Osgood approximation and assess the experiments by an evolution test function of stored over dissipated energy (lambda factor). Parameter studies of, strain hardening, dislocation creep parameter, strain rates, temperature, and lambda factor as well as mesh sensitivity are presented to explore the sensitivity of the newly derived transient/steady state flow law. Our analysis can be seen as one of the first steps in a hybrid computational-laboratory-field modeling workflow. The analysis could be improved through independent verifications by thermographic analysis in physical laboratory experiments to independently assess lambda factor evolution under laboratory conditions.

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Heterogeneity of inelastic strain during creep of Carrara marble: Microscale strain measurement technique

Quintanilla-Terminel

Evans

2016

JGR Solid Earth

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We combined the split cylinder technique with microfabrication technology to observe strain heterogeneities that were produced during high‐pressure transient creep of Carrara marble. Samples were patterned with a custom‐designed grid of markers spaced 10 µm apart and containing an embedded coordinate system. The microscale strain measurement (MSSM) technique described here allowed us to analyze the local strain distribution with unprecedented detail over large regions. The description of the strain field is a function of the area over which strain is being computed. The scale at which the strain field can be considered homogeneous can provide insight into the deformation processes taking place. At 400–500°C, when twinning production is prolific, we observe highly strained bands that span several grains. One possible cause for the multigrain bands is the need to relieve strain incompatibilities that result when twins impinge on neighboring grains. At 600–700°C, the strain fields are still quite heterogeneous, and local strain varies substantially within grains and near grain boundaries, but the multigrain slip bands are not present. Deformation is concentrated in much smaller areas within grains and along some grain boundaries. The disappearance of the multigrain slip bands occurs when the deformation conditions allow additional slip systems to be activated. At 600°C, when the total strain is varied from 0.11 to 0.36, the spatial scale of the heterogeneity does not vary, but there are increases in the standard deviation of the distribution of local strains normalized by the total strain; thus, we conclude that the microstructure does not achieve a steady state in this strain interval.

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Rheological and microstructural evolution of Carrara marble with high shear strain: results from high temperature torsion experiments

Cited by 148 publications

References 35 publications

Strain localization during high temperature creep of marble: The effect of inclusions

Strain localization during high temperature creep of marble: The effect of inclusions

From transient to steady state deformation and grain size: A thermodynamic approach using elasto-visco-plastic numerical modeling

Heterogeneity of inelastic strain during creep of Carrara marble: Microscale strain measurement technique

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