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 () and () 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.
Highlights
Petrofabric analysis contains information about the deformation history of the sample
The grain orientations with respect to the sample are completely described by the orientation distribution function (ODF) which can be determined by single orientation measurements or by pole figure inversion
A representative average of the rock fabric can be obtained by neutron diffraction on large samples
Summary
Petrofabric analysis contains information about the deformation history of the sample. Comparing the orientation distribution of the grains in naturally deformed rocks with the texture of experimentally deformed material and computer simulations of the deformation process, the data may be used to estimate the conditions of temperature, pressure, stress and strain and the deformation mechanisms which were active. The grain orientations with respect to the sample are completely described by the orientation distribution function (ODF) which can be determined by single orientation measurements or by pole figure inversion. A representative average of the rock fabric can be obtained by neutron diffraction on large samples. In this paper the partial texture of quartz in four gneisses from selected points of a fold structure in the Central Erzgebirge is studied. All pole figure measurements were carried out by neutron time-of-flight (TOF) diffraction at the pulsed reactor
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