The Structural Evolution of an Orthogneiss-fold Within the Reitzenhainer Rotgneisstruktur (Erzgebirge Mts., GDR)
1990
The crystallographic preferred orientations of quartz in gneiss taken from different spots of a
recumbent fold structure in the Erzgebirge Mts. (southern GDR) are studied by means of neutron
time-of-flight diffraction. A single component texture has been found for all specimens, with quartz
c-axes parallel to the tectonic a-direction.
The variations in texture sharpness are related to different
deformation conditions of the samples. A fabric rotation of 30° has been found from the limb to the
crest of the fold on the basis of (101¯0) and (112¯0) pole figures. The basal pole figures of quartz derived
from an ODF analysis compared well with optical U-stage measurements. The determined fabrics are
discussed taking into account model calculations of experimentally deformed quartzites and geological
informations.
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