Fig. 6: Electron backscatter diffraction (EBSD) analyses of a high-strain experiment.
From: Deep crustal deformation driven by reaction-induced weakening
a Phase map of a high-strain zone (OR114). Parent Cpx1 porphyroclasts (grain size > 5 µm) and new Cpx2 grains (grain size < 5 µm) are highlighted by white and gray boundaries, respectively. Non-indexed pixels are indicated by black areas (mostly corresponding to Pl1-rich domains). b Orientation map of clinopyroxene grains (Cpx1 and Cpx2) color-coded based on their crystal reference frame (inverse pole figure) with respect to the shear direction (X). c Crystallographic preferred orientation of Cpx1, Cpx2, zoisite and kyanite shown in equal-area lower-hemisphere pole figures. The latter are plotted with isocontours based on the mean orientation of grains, except for Cpx1 where all pixels are considered (see “Method” section for details and references). Number of data points (n), texture index (J), misorientation index (M) and mean grain size (GS; root mean square) are given for each set of pole figures, except for Cpx1 where the M-index is not given (not applicable). MUD = multiple of uniform distribution. d Grain size distribution, shape preferred orientation (SPO; long axis distribution) and vorticity axis distribution across subgrain boundaries (SGB) of Cpx2. Note that grains below 0.7 µm in size were not detected because of the map step size of 0.2 µm (see “Method” section). σ1 = maximum stress; σ3 = minimum stress. Source data are provided as a Source Data file.
