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Non-invasive 3D Crystallography of Geological Media in the Laboratory

One of the main challenges in geological microstructural analysis is to understand the details and distribution of the mineral crystals from which the rock is constructed, principally investigated using Electron Back Scatter Diffraction (EBSD) [1]. Although this technique has provided great insight into rock deformation, metamorphic processes, planetary geology and geochronology it suffers from the inherent limitations that it can only be performed on the surface of a polished sample under the vacuum conditions of an electron microscope. And while it is possible to extend this technique into 3D by coupling with Focused Ion Beam (FIB) serial sectioning, this is destructive, extremely slow and not practical for most applications. It also does not allow for samples to be subjected to experimental loading, temperature or deformation which would allow for the direct investigation of geological processes in situ.