Slip-system and EBSD analysis on compressively deformed fine-grained polycrystalline olivine

Farla, Robert; Gerald, J. D. Fitz; Kokkonen, Harri; Halfpenny, Angela; Faul, U.; Jackson, Ian

doi:10.1144/sp360.13

Cited by 10 publications

(7 citation statements)

References 34 publications

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“…Before the transformation, the [010] axes are preferentially parallel to the compression while the [001] axes lie within the compressional plane. This texture is in agreement with previous studies of natural and synthetic olivine samples deformed in a uniaxial compression regime (Wenk et al, 2004;Farla et al, 2011). After transformation, the newly formed phase shows a mostly random grain orientation, while the preferred orientation of the hydrous phase grains decreases significantly.…”

Section: Microstructural Evolutionsupporting

confidence: 92%

In situmonitoring of phase transformation microstructures at Earth's mantle pressure and temperature using multi-grain XRD

et al. 2015

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Microstructures govern the mechanical properties of materials and change dramatically during phase transformations. A detailed understanding of microstructures at different stages of a transformation is important for the design of new materials and for constraining geophysical processes. However, experimental studies of transformation microstructures at the grain scale have been mostly based on ex situ observations of quenched products, which are difficult to correlate with bulk sample properties and transformation kinetics. Here, it is shown how multi‐grain crystallography on polycrystalline samples, combined with a resistively heated diamond anvil cell, can be applied to investigate the microstructural properties of a material undergoing a phase transition in situ at high pressure and high temperature. This approach allows the extraction of the crystallographic parameters and orientations of several hundreds of grains inside a transforming sample. Important bulk information on grain size distributions and orientation relations between the parent and the newly formed phase at the different stages of the transformation can be monitored. These data can be used to elucidate transformation mechanisms (e.g. coherent versus incoherent growth), growth rates and orientation‐dependent growth of individual grains. The methodology is demonstrated on the α–γ phase transitions in hydrous Mg2SiO4·H2O up to 22 GPa and 940 K. This transformation most likely occurs in the most abundant mineral of the Earth's upper mantle (Mg0.8Fe0.2SiO4) in deep cold subducted slabs and plays an important role in their subduction behaviour.

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Section: Microstructural Evolutionsupporting

confidence: 92%

In situmonitoring of phase transformation microstructures at Earth's mantle pressure and temperature using multi-grain XRD

et al. 2015

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“…Many microstructural studies of plastically deformed polycrystals observe intragranular heterogeneity of plastic strain ranging from those conducted on highly anisotropic materials like olivine and ice67 to metals, which generally have more isotropic single-crystal rheological properties2891011. The degree of strain heterogeneity is thought to be a function of the anisotropy of the material17.…”

Section: Discussionmentioning

confidence: 99%

The importance of stress percolation patterns in rocks and other polycrystalline materials

2013

Nat Commun

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A new framework for thinking about the deformation behavior of rocks and other heterogeneous polycrystalline materials is proposed, based on understanding the patterns of stress transmission through these materials. Here, using finite element models, I show that stress percolates through polycrystalline materials that have heterogeneous elastic and plastic properties of the same order as those found in rocks. The pattern of stress percolation is related to the degree of heterogeneity in and statistical distribution of the elastic and plastic properties of the constituent grains in the aggregate. The development of these stress patterns leads directly to shear localization, and their existence provides insight into the formation of rhythmic features such as compositional banding and foliation in rocks that are reacting or dissolving while being deformed. In addition, this framework provides a foundation for understanding and predicting the macroscopic rheology of polycrystalline materials based on single-crystal elastic and plastic mechanical properties.

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“…Misorientation boundary data for olivine based on large area maps (Table 2) and for targeted areas (Table 3) derived from CRA plots allow inferences to be made of the slip systems that were responsible for deformation (de Kloe et al, 2002;Farla et al, 2011).…”

Section: Slip System Analysismentioning

confidence: 99%

Electron backscatter diffraction (EBSD) study of seven heavily metamorphosed chondrites: Deformation systematics and variations in pre-shock temperature and post-shock annealing

Ruzicka

Hugo

2018

Geochimica et Cosmochimica Acta

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Slip-system and EBSD analysis on compressively deformed fine-grained polycrystalline olivine

Cited by 10 publications

References 34 publications

In situmonitoring of phase transformation microstructures at Earth's mantle pressure and temperature using multi-grain XRD

In situmonitoring of phase transformation microstructures at Earth's mantle pressure and temperature using multi-grain XRD

The importance of stress percolation patterns in rocks and other polycrystalline materials

Electron backscatter diffraction (EBSD) study of seven heavily metamorphosed chondrites: Deformation systematics and variations in pre-shock temperature and post-shock annealing

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