The Contribution of Neutron Texture Goniometry to the Study of Complex Tectonics in the Alps

Abstract

Textures (lattice-preferred orientations) of rocks can be analyzed by various methods, each of which has its specific qualities. Unlike any other technique, neutron texture goniometry affords true volume texture measurements of relatively large (up to several cm) isometric samples. Furthermore, the textures of different minerals in polyphasic rocks can be analyzed simultaneously. This is particularly attractive for applications in the geosciences where textures of ductily deformed rocks are studied for various purposes, but mostly to gain information about the geological mechanisms of texture formation and rock deformation. Presenting two case studies from different tectonic settings within the Alps and taking quartz textures as examples, we discuss (1) some aspects of texture representation by normal and inverse pole figures, that is, the two most common diagram types, and (2) the potentials and limitations of interpreting rock textures in terms of the kinematical path, strain geometry, and physical conditions during deformation.