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PETROFABRIC ANALYSIS
After
Bruno Sander. A method to study the microstructural relations and orientations
in tectonically deformed rocks. Usually, involves plotting orientations of axes
of uniaxial minerals or poles to 001 planes of micas (biaxial). The diagrams
thus produced are known as fabric diagrams. These are produced using a 4 or 5
axes universal stage or now with the aid of a digital computer using texture
goniometer. The diagrams may show axial, orthorhombic, monoclinic or triclinic
symmetry depending upon the complexity of deformation. In case of purely L or or
purely S tectonites, the symmetry is axial but for LS types, it can vary from
orthorhombic to triclinic. The figure that accompanies this description is a pi
pole digram that shows axial symmetry in the top half two plots and orthorhombic
and monoclinic for the bottom half.
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