FAME: Software for analysing rock microstructures

Hammes, Daniel M.; Peternell, Mark

doi:10.1016/j.cageo.2016.02.010

Cited by 21 publications

(20 citation statements)

References 25 publications

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“…An area containing equiaxed ice grains, 5 × 5 mm or 1000 × 1000 pixels, was located within the 250 µm-thick wafer and a record of microstructural evolution with a spatial resolution of 5 µm/pixel was recorded every 4 min (Peternell and Wilson, 2016). The single-frame measurements from the fabric analyser were combined with results from a FAME analysis (Hammes and Peternell, 2016). .…”

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The influence of strain rate and presence of dispersed second phases on the deformation behaviour of polycrystalline D₂O ice

et al. 2018

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This contribution discusses results obtained from 3-D neutron diffraction and 2-D fabric analyser in situ deformation experiments on laboratory-prepared polycrystalline deuterated ice and ice containing a second phase. The two-phase samples used in the experiments are composed of an ice matrix with (1) air bubbles, (2) rigid, rhombohedral-shaped calcite and (3) rheologically soft, platy graphite. Samples were tested at 10°C below the melting point of deuterated ice at ambient pressures, and two strain rates of 1 × 10−5 s−1 (fast) and 2.5 × 10−6 s−1 (medium). Nature and distribution of the second phase controlled the rheological behaviour of the ice by pinning grain boundary migration. Peak stresses increased with the presence of second-phase particles and during fast strain rate cycles. Ice-only samples exhibit well-developed crystallographic preferred orientations (CPOs) and dynamically recrystallized microstructures, typifying deformation via dislocation creep, where the CPO intensity is influenced in part by the strain rate. CPOs are accompanied by a concentration of [c]-axes in cones about the compression axis, coinciding with increasing activity of prismatic-<a> slip activity. Ice with second phases, deformed in a relatively slower strain rate regime, exhibit greater grain boundary migration and stronger CPO intensities than samples deformed at higher strain rates or strain rate cycles.

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The influence of strain rate and presence of dispersed second phases on the deformation behaviour of polycrystalline D₂O ice

et al. 2018

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“…The FA technique is a fast and inexpensive method of attaining the CPO of optically uniaxial crystals in a desktop environment. Its low sample preparation requirements and user‐friendly interface make it a simple but effective tool for CPO analysis (Wilson & Peternell, ; Hammes & Peternell, ).…”

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Comparison of quartz crystallographic preferred orientations identified with optical fabric analysis, electron backscatter and neutron diffraction techniques

Hunter

Wilson

Luzin

2016

Journal of Microscopy

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Three techniques are used to measure crystallographic preferred orientations (CPO) in a naturally deformed quartz mylonite: transmitted light cross-polarized microscopy using an automated fabric analyser, electron backscatter diffraction (EBSD) and neutron diffraction. Pole figure densities attributable to crystal-plastic deformation are variably recognizable across the techniques, particularly between fabric analyser and diffraction instruments. Although fabric analyser techniques offer rapid acquisition with minimal sample preparation, difficulties may exist when gathering orientation data parallel with the incident beam. Overall, we have found that EBSD and fabric analyser techniques are best suited for studying CPO distributions at the grain scale, where individual orientations can be linked to their source grain or nearest neighbours. Neutron diffraction serves as the best qualitative and quantitative means of estimating the bulk CPO, due to its three-dimensional data acquisition, greater sample area coverage, and larger sample size. However, a number of sampling methods can be applied to FA and EBSD data to make similar approximations.

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“…The resulting CPO is in general moderately to well developed, and clear maxima can be identified in most samples. All samples were scanned with an automated fabric analyser microscope (Peternell et al, 2010;Wilson et al, 2007), and the CPO was determined using the FAME (Fabric Analyser Microstructure Evaluation) software (Hammes & Peternell, 2016).…”

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Neoarchean Synmagmatic Crustal Extrusion in the Transpressional Yilgarn Orogen

2020

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Positive feedback mechanisms between magmatism and transpression allow efficient extraction, transfer, and delivery of synorogenic granitic magma. Although many Archean orogens are dominantly transpressional and record voluminous production of synorogenic granites, the role of crustal magmatism in Archean tectonics has been so far little explored. We detail here the structural evolution of the Ballard shear zone, a major synorogenic, inclined transpressional shear zone from the upper-crustal granite-greenstone system of the Neoarchean Yilgarn Orogen (Western Australia). We show that the bulk of the three-dimensional deformation was efficiently partitioned between greenstones and crystallizing granitic sheets, with the latter accommodating large amounts of orogen-parallel strain through hypersolidus viscous flow. Other large synorogenic Yilgarn shear zones show a similar structural evolution, allowing the formulation of a general tectonomagmatic model. The positive feedback between protracted magmatism and transpression promoted lower-to middle-crustal extraction and upward transfer of syntectonic magma. In upper-crustal sink regions, the rheological dichotomy between cold and strong greenstones and hot and weak sheets of crystallizing granite allowed efficient kinematic partitioning, resulting in the extrusion of the partially molten shear zone cores. This sequence of events occurred repeatedly throughout the orogeny, following magma pulses, with the bulk of the shearing along each shear zone waning with the cooling of each syntectonic pluton. Synorogenic magmatism played therefore a major role in promoting and localizing transpressional deformation, and ultimately in shaping the architecture of the whole Yilgarn orogen.

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FAME: Software for analysing rock microstructures

Cited by 21 publications

References 25 publications

The influence of strain rate and presence of dispersed second phases on the deformation behaviour of polycrystalline D₂O ice

The influence of strain rate and presence of dispersed second phases on the deformation behaviour of polycrystalline D₂O ice

Comparison of quartz crystallographic preferred orientations identified with optical fabric analysis, electron backscatter and neutron diffraction techniques

Neoarchean Synmagmatic Crustal Extrusion in the Transpressional Yilgarn Orogen

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FAME: Software for analysing rock microstructures

Cited by 21 publications

References 25 publications

The influence of strain rate and presence of dispersed second phases on the deformation behaviour of polycrystalline D2O ice

The influence of strain rate and presence of dispersed second phases on the deformation behaviour of polycrystalline D2O ice

Comparison of quartz crystallographic preferred orientations identified with optical fabric analysis, electron backscatter and neutron diffraction techniques

Neoarchean Synmagmatic Crustal Extrusion in the Transpressional Yilgarn Orogen

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The influence of strain rate and presence of dispersed second phases on the deformation behaviour of polycrystalline D₂O ice

The influence of strain rate and presence of dispersed second phases on the deformation behaviour of polycrystalline D₂O ice