Textures and Microstructures
Volume 25 (1996), Issue 2-4, Pages 211-222
doi:10.1155/TSM.25.211

Preferred Orientations of Mica Bearing Rocks Described by Texture Components

K. Helming,1 D. Schmidt,2 and K. Ullemeyer3

1Department of Physical Metallurgy, TU Clausthal, Großer Bruch 23, Clausthal-Zellerfeld D-38678, Germany
2Institute of Geology and Paleontology, TU Clausthal, Leibnizstr. 10, Clausthal-Zellerfeld D-38678, Germany
3joint Institute of Nuclear Research, Frank Laboratory for Neutron Physics, Dubna, Moscow Region 141980, Russia

Received 26 July 1995

Copyright © 1996 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Up to now Texture investigations of phyllosilicates were restricted to pole density measurements of the (001) basal plane. Because of the tabular grain shape parallel to the basal plane an axial symmetry of the texture is assumed usually. This assumption was proved for four mica bearing samples by calculating the ODF from neutron diffraction data. Beside the mica-texture the textures of the other major fractions like quartz and feldspar were determined to detect correlation between them. The textures are explained by components. Each component is characterised by a preferred orientation or fibre axis, a corresponding spreading and an intensity Iʿ describing the volume fraction of all crystallites belonging to the component. The presented component method can be applied to any crystal symmetry and to polyphase materials with overlapped pole figures.