The Structural Evolution of an Orthogneiss-fold Within the Reitzenhainer Rotgneisstruktur (Erzgebirge Mts., GDR)
V. Damm,1K. Feldmann,2A. Frischbutter,1W. Kleinsteuber,2and K. Walther2
Received01 Jul 1988
Abstract
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.