Textures and fabrics in rocks

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Abstract
In the petrological context the term 'fabric' denotes both preferred orientations in populations of crystal grains (metallurgists call this texture) and the shapes and mutual dispositions of matrix grains and subsidiary phases (what metallurgists term morphology). Geologists and metallurgists are often concerned with the fabrics which arise from mechanical deformation of materials and the resultant recrystallization when the temperature is high enough. Recent research into rock fabrics has increasingly involved metallurgical techniques and theories. In particular Transmission Electron Microscopy (TEM) and X-ray texture goniometry have been widely applied. By drawing analogies with metallurgical phenomena, geologists are better able to understand de-formation mechanisms and the textures produced in rocks. Therefore this meeting was organized to bring geologists and metallurgists together in order to foster a multidisciplinary approach to problems of deformation and textures in rocks. Two leading metallurgists were invited to give reviews of current thinking on deformation textures and recrystallization textures in metals. Dr I. Dillamore (British Steel Corporation, Sheffield) outlined the development of preferred orientations in deformed metals. He showed that the orientation distribution found in deformed face centred (f.c.c.) and body centred (b.c.c.) cubic metals could be explained by mathematical models which take account of the intracrystalline slip systems and shape change for each grain in a polycrystalline aggregate during plastic deformation. However, in the study of deformed metals, the deformation history and material properties are relatively well known com- pared with those for rocks and minerals but it is clear that these modelling techniques will be

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