Textures and crystallographic fabrics of representative igneous (a–c) and meta-igneous (d–f) xenoliths. Igneous pyroxene–hornblende gabbro xenolith PSV11: (a) Photomicrograph in XPL of showing E–W aligned plagioclase; (b) same image in PPL showing interstitial amphibole and amphibole overgrowth on clinopyroxene; (c) contoured pole EBSD Fig.s for the main mineral components showing concentrations in terms of multiples of uniform distribution. This sample shows no clear microstructural evidence for subsolidus deformation, but does display a clear magmatic layering that is oriented roughly NE–SW, perpendicular to the concentration of poles to the (001) planes of plagioclase and clinopyroxene. The weaker fabric in amphibole reflects topotactic overgrowth on clinopyroxene. Images were taken from an area of ~15 × 22 mm. The number of indexed points, J-index and M-index for the three different minerals are: plagioclase (14 608, 4.8392, 0.1100), clinopyroxene (5759, 3.9596, 0.0782) and amphibole (4122, 2.9435, 0.0308). Mylonitic meta-igneous xenolith PSV10: (d) photomicrograph in PPL showing domains of recrystallised plagioclases enveloped by microcrystalline clinopyroxene; (e) high-magnification photomicrograph in PPL displaying amphibole both filling pore space between clinopyroxene grains and forming discrete oriented grains. Note the triple junctions between plagioclase grains, suggestive of the former presence of intergranular fluid; (f) contoured pole Fig.s for the main mineral components showing concentrations in terms of multiples of uniform distribution. The deformation-related foliation is oriented E–W. The grain size is much smaller than PSV11 and an imaged area of 700 × 500 μm was sufficient to obtain a representative result. The number of indexed points, J-index and M-index are as follows: plagioclase (90 211, 1.6168, 0.0091), clinopyroxene (89 026, 1.7238, 0.0142) and amphibole (51 404, 1.4015, 0.0102).