Strength evolution and the development of crystallographic preferred orientation during deformation of two-phase marbles

Austin, N. J.; Evans, Brian; Rybacki, E.; Dresen, Georg

doi:10.1016/j.tecto.2014.04.018

Cited by 11 publications

(12 citation statements)

References 67 publications

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“…6b). This is in agreement with previously conducted experimental studies (Wilson, 1984;Tullis and Wenk, 1994;Austin et al, 2014). In natural shear zones, GBS accompanied by diffusion creep or dislocation glide is often proposed as a process responsible for the weaker CPO in polymineralic rocks, compared to their monomineralic counterparts (e.g., Krabbendam et al, 2003;Song and Ree, 2007).…”

Section: Effect Of Second Phase On Deformation Mechanisms and Cpo Devsupporting

confidence: 91%

“…Within natural shear zones, CPO of the dominant matrix phase in polymineralic rocks is usually weaker, and grain size is smaller, compared with neighbouring monomineralic rocks, deformed at the same conditions . Similar relationships have been observed in experiments (e.g., Wilson, 1984;Tullis and Wenk, 1994;Austin et al, 2014).…”

Section: Introductionsupporting

confidence: 87%

“…Although diffusion creep (with n ∼ 1) in ice is theoretically possible (Duval et al, 1983), it has not yet been reproduced experimentally. Nevertheless, some authors (e.g., Azuma et al, 1999) have proposed a combination of dislocation creep (n ∼ 3) and diffusion creep (n ∼ 1) to explain the weaker c-axis clustering, observed in fine-grained layers of ice with impurities in ice cores. GBS with n ∼ 1.8 and 2.4 was reported in ice by Goldsby and Kohlstedt (1997).…”

Section: Effect Of Second Phase On Deformation Mechanisms and Cpo Devmentioning

confidence: 99%

“…However, only a limited number of studies were designed to investigate their effect on the CPO of the matrix phase (e.g., Tullis and Wenk, 1994;Ebert et al, 2007;Austin et al, 2014;Little et al, 2015;Hunter et al, 2016). Within natural shear zones, CPO of the dominant matrix phase in polymineralic rocks is usually weaker, and grain size is smaller, compared with neighbouring monomineralic rocks, deformed at the same conditions .…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Rheology, microstructure and crystallographic preferred orientation of matrix containing a dispersed second phase: Insight from experimentally deformed ice

Cyprych

Piazolo

Wilson

et al. 2016

Earth and Planetary Science Letters

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Section: Effect Of Second Phase On Deformation Mechanisms and Cpo Devsupporting

confidence: 91%

Section: Introductionsupporting

confidence: 87%

Section: Effect Of Second Phase On Deformation Mechanisms and Cpo Devmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Rheology, microstructure and crystallographic preferred orientation of matrix containing a dispersed second phase: Insight from experimentally deformed ice

Cyprych

Piazolo

Wilson

et al. 2016

Earth and Planetary Science Letters

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“…Esta interpretación es consistente con la baja orientación que muestran la orientación de los polos de macla e y que podría estar indicando que el maclado mecánico estuvo inhibido en las primeras OCPs por el fino tamaño de grano de las calcitas (i.e., Rutter et al, 1994;Austin et al, 2014). Las figuras de proyección inversa de calcita sugieren la actuación combinada de los sistemas de deslizamiento de c+e en la dirección <a> que podrían iniciarse durante el régi-men de creep de dislocaciones por migración de bordes de grano.…”

Section: Evolución Paleopiezométrica Durante La Exhumaciónunclassified

Paleostress evolution during the exhumation of high-P marbles, Samaná Complex, northern Hispaniola

Fernandez¹,

Rodríguez²,

Viruete³

et al. 2017

Bol. geol. min.

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The marble of the Samaná complex presents a widespread foliation formed during its exhumation following a general decompressive strain path from high pressure (2.0>P>0.7 GPa) and low temperature (<500 ºC) conditions. The foliation is plano-linear and blastomylonitic. Deformation distribution is highly heterogeneous. Calcite preferred orientation is poor, even though the marble has a well-defined tectonic fabric. The blastomylonitic fabric is masking an earlier tectonic fabric. Cathodoluminescence images reveal that intense fracturing formed prior to foliation development in the marbles. The thermodynamic modelling of mineral phase transformations during prograde metamorphism indicate an increase in water content (1.2%<w.t.H2O<1.8%) that may have involved an increase in fluid pressure and triggered rock embrittlement and subsequent exhumation. Stress drops after a cataclastic event, as well as grain-size reduction by abrasion, may have activated dissolution-precipitation processes along cataclastic bands. Differential stress |σ1-σ3| increased as exhumation progressed after the cataclastic event. Estimates of paleostress based on calcite mechanical twinning indicate values of |σ1-σ3| >350 MPa during deformation. In contrast, mean flow stress during grain-boundary migration is estimated in |σ1-σ3| <150 MPa. The high paleostress record and microstructures of the marble are consistent with the high exhumation rate calculated (>110 MPa Ma-1). All of these data suggest that exhumation always occurred near the brittle-ductile regime of deformation.

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Strain localization in polycrystalline material with second phase particles: Numerical modeling with application to ice mixtures

Cyprych

Brune

Piazolo

et al. 2016

Geochem. Geophys. Geosyst.

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We use a centimeter-scale 2-D numerical model to investigate the effect of the presence of a second phase with various volume percent, shape, and orientation on strain localization in a viscoelastic matrix. In addition, the evolution of bulk rheological behavior of aggregates during uniaxial compression is analyzed. The rheological effect of dynamic recrystallization processes in the matrix is reproduced by viscous strain softening. We show that the presence of hard particles strengthens the aggregate, but also causes strain localization and the formation of ductile shear zones in the matrix. The presence of soft particles weakens the aggregate, while strain localizes within the particles and matrix between particles. The shape and the orientation of second phases control the orientation, geometry, and connectivity of ductile shear zones. We propose an analytical scaling method that translates the bulk stress measurements of our 2-D simulations to 3-D experiments. Comparing our model to the laboratory uniaxial compression experiments on ice cylinders with hard second phases allows the analysis of transient and steady-state strain distribution in ice matrix, and strain partitioning between ice and second phases through empirical calibration of viscous softening parameters. We find that the ice matrix in two-phase aggregates accommodates more strain than the applied bulk strain, while at faster strain rates some of the load is transferred into hard particles. Our study illustrates that dynamic recrystallization processes in the matrix are markedly influenced by the presence of a second phase.

show abstract

Strength evolution and the development of crystallographic preferred orientation during deformation of two-phase marbles

Cited by 11 publications

References 67 publications

Rheology, microstructure and crystallographic preferred orientation of matrix containing a dispersed second phase: Insight from experimentally deformed ice

Rheology, microstructure and crystallographic preferred orientation of matrix containing a dispersed second phase: Insight from experimentally deformed ice

Paleostress evolution during the exhumation of high-P marbles, Samaná Complex, northern Hispaniola

Strain localization in polycrystalline material with second phase particles: Numerical modeling with application to ice mixtures

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