C-Axis Cross Girdle
The skeletal outline of all c-axes in a pole figure comprises two girdles  at a low angle to each other. Together, these girdles form a cross in a pole figure.

C-Axis Point Maxima
A concentration of c-axes at point maxima within the pole figure.

C-Axis Single Girdle
A concentration of  c-axes  along a great circle within a pole figure.

CIP (computer integrated polarization microscopy)
This  technique allows one to represent the c-axis position of each pixel with  a characteristic color. Therefore, the microfabric can be presented as c-axis orientation images (COIs) in which the CPO can be directly inferred from the actual colors of grains and domains. For more detailed information about CIP, see Panozzo-Heilbronner, R. & Pauli, C.  1993. Integrated spatial and orientation analysis of quartz c-axes by computer-aided microscopy. J. Struct. Geol. , 15, 369-383.

CPO (Crystallographic  Preferred Orientaion)
The tendency of crystallographic axes to occupy a specific orientation with respect to external fabric coordinates; a non-random distribution of  c-axes in a pole figure (e.g.  along great circles).

Dislocation Creep
Deformation mechanism involving the glide and climb of dislocations within the crystal lattice.

Domains
Groups of grains that have the same CPO and/or SPO.

Easy Glide Orientation
Special orientations of intracrystalline glide planes for which the resolved shear stress on the glide plane is maximized.

Fracturing
The nucleation and growth of cracks

Glide Induced Vorticity
Rotation of c-axes associated with intracrystalline gliding (see Lister, G.S. 1982. A vorticity equation for lattice reorientation during plastic deformation. Tectonophysics , 82, 351-366).

GBM (grain boundary migration)
Movement of grain boundaries involving the growth of one grain and consumption of another.  In our experiments, GBM is assumed to be driven primarily by the reduction of  internal strain energy, i.e. the stored energy.

HT-HS
High Temperature - High Strain Rate Experiments.

HT-LS
High Temperature - Low  Strain Rate Experiments.

Instanteneous Stretching Direction
Direction of incremental extension at 45° with respect to the shear zone boundary in simple shear.

IT-HS
Intermediate Temperature - High Strain Rate Experiments.

LT-HS
Low Temperature - High Strain Rate Experiments.

Marker Analysis
A computer program which allows one to calculate strain distribution within a deforming aggregate based on the digitized positions of tiny marker particles within the aggregate. For more information see Bons, P., Jessell, M.W. & Passchier, C.W. 1993. The analysis of progressive deformation in rock analogues. J. Struct. Geol. , 15, 403-412.

Microfabric
The Microfabric comprises the microstructure and the texture of a material.

Microstructure
Microstructure comprises the geometric elements of the microfabric e.g. grain size and grain shape.

PAROR (Particle Orientation)
This computer program calculates the orientation distribution of particles´ long axes and short/long axis ratios. For further information see Panozzo, R. 1983. Two-dimensional analysis of shape-fabric using projections of digitized lines in a plane. Tectonophysics, 95, 279-294.

Rigid Body Rotation
Rotation of grains without internal deformation.  This mechanism occurs especially in grains which are unfavorably oriented for intracrystalline deformation.

Rotational Mechanisms
Mechanisms that rotate grains´ crystallography into orientations which are  favorable for intracrystalline glide. Such mechanisms include rigid body rotation, glide induced vorticity and subgrain rotation.

SPO
Shape Preferred Orientation;  A non-random distribution of grain shapes.

Spontaneous Nucleation
The sudden appearance of new grains within an aggregate.  Such nucleation is inferred to involve rapid subgrain rotation.

Steady State
Strain invariance of the microfabric on the sample scale.

Subgrain Rotation Recr .
The formation of crystallographically distinct parts of grains (subgrains) via the climb of dislocations into polygonally arranged walls.

SURFOR (Surface Orientation)
This computer program calculates the orientation distribution of surfaces. For further information see Panozzo, R. 1984:. Two-dimensional strain from the orientation of lines in a plane. J. Struct. Geol. , 6, 215-221.

SZB
Shear Zone Boundary

Texture
Preferred orientation of crystallographic axes in the sample.