Neutron Scattering

The neutron diffraction pole figures of the starting material have been used for a
calculation of a three-dimensional ODF according to the series expansion method (Fig .
18 .24) .
Fig. 18 .24 : ODFs ofrolled and recrystallized copper according ta neutron polefigure data .
The ODFs are represented by sections ofconst (p2 in the three-dimmensional Eulerian space
6.4 Natural Deformation Texture of Quartz
Quartz (Si02) is the most naturally occuring mineral . Among all minerals naturally deformed
quartzites display the largest variety of texture types [13] . The variation has been associated
with conditions of metamorphic grade and with the deformation history . Quartzites bear
information on the tectonic deformation mechanisms by the formation of intraciystalline glide
systems which are temperature dependent and strongly influenced by water . Due to its optical
properties, quartz can bc investigated by single grain analysis using optical microscopy
(compare chapter 4 .0). U-stage results can bc compared with neutron diffraction pole figures
on the global texture (sec Fig . 18 .15) .
The Jülich neutron texture diffractometer has been used for texture studies on
quartzites originating from différent geological zones [14] . The quartzite to be discussed here
was collected from thé (late Proterozoic to early Papaeozoic) Pan-African Nosib quartzite of
thé Tomakas area in thé Kaoko belt, North-West Namibia, a 560 million years old geological
formation [15] . Pole figure measurements have been performed on a cube-shaped specimen of
20 mm edge size. Grain sizes varied between 0 .03 and 0.83 mm .
18-17