Texture Analysis with MTEX – Free and Open Source Software Toolbox

Bachmann, Florian; Hielscher, Ralf; Schaeben, Helmut

doi:10.4028/www.scientific.net/ssp.160.63

Cited by 2,091 publications

(863 citation statements)

References 9 publications

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“…After filtering processes, all measurements with confidence index <0.2 were excluded. Orientation distribution function calculations and plots of pole figures were conducted via the MTEX toolbox for Matlab (Hielscher and Schaeben, 2008;Bachmann et al, 2010).…”

Section: Methodsmentioning

confidence: 99%

Faulting processes in active faults – Evidences from TCDP and SAFOD drill core samples

Janssen

Wirth

Wenk

et al. 2014

Journal of Structural Geology

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a b s t r a c tThe microstructures, mineralogy and chemistry of representative samples collected from the cores of the San Andreas Fault drill hole (SAFOD) and the Taiwan Chelungpu-Fault Drilling project (TCDP) have been studied using optical microscopy, TEM, SEM, XRD and XRF analyses. SAFOD samples provide a transect across undeformed host rock, the fault damage zone and currently active deforming zones of the San Andreas Fault. TCDP samples are retrieved from the principal slip zone (PSZ) and from the surrounding damage zone of the Chelungpu Fault. Substantial differences exist in the clay mineralogy of SAFOD and TCDP fault gouge samples. Amorphous material has been observed in SAFOD as well as TCDP samples. In line with previous publications, we propose that melt, observed in TCDP black gouge samples, was produced by seismic slip (melt origin) whereas amorphous material in SAFOD samples was formed by comminution of grains (crush origin) rather than by melting. Dauphiné twins in quartz grains of SAFOD and TCDP samples may indicate high seismic stress. The differences in the crystallographic preferred orientation of calcite between SAFOD and TCDP samples are significant. Microstructures resulting from dissolutioneprecipitation processes were observed in both faults but are more frequently found in SAFOD samples than in TCDP fault rocks. As already described for many other fault zones clay-gouge fabrics are quite weak in SAFOD and TCDP samples. Clay-clast aggregates (CCAs), proposed to indicate frictional heating and thermal pressurization, occur in material taken from the PSZ of the Chelungpu Fault, as well as within and outside of the SAFOD deforming zones, indicating that these microstructures were formed over a wide range of slip rates.

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Section: Methodsmentioning

confidence: 99%

Faulting processes in active faults – Evidences from TCDP and SAFOD drill core samples

Janssen

Wirth

Wenk

et al. 2014

Journal of Structural Geology

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“…Thin sections were first analyzed optically. Calculations of the orientation distribution function and pole figure contouring were carried out using the MTEX toolbox for Matlab (Hielscher and Schaeben, 2008;Bachmann et al, 2010), using a Gaussian half-width of 10° and a maximum harmonic expansion factor (L max ) of 32. The fabric strength was also characterized, represented by the dimensionless J-index (J=∫f(g) 2 dg), where f(g) is the volume fraction of orientations with an orientation between g and g+dg and dg is the volume of the region of integration in orientation space.…”

Section: Microstructure Analysismentioning

confidence: 99%

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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“…The data was evaluated using the MATLAB ® toolbox MTEX 3.5.0 for quantitative texture analysis [22].…”

Section: Methodsmentioning

confidence: 99%

Copper diffusion into single-crystalline TiN studied by transmission electron microscopy and atom probe tomography

Mühlbacher¹,

Martín²,

Sartory³

et al. 2015

Thin Solid Films

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Texture Analysis with MTEX – Free and Open Source Software Toolbox

Cited by 2,091 publications

References 9 publications

Faulting processes in active faults – Evidences from TCDP and SAFOD drill core samples

Faulting processes in active faults – Evidences from TCDP and SAFOD drill core samples

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

Copper diffusion into single-crystalline TiN studied by transmission electron microscopy and atom probe tomography

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