Figure 6: Visualization and fabric analysis of μCT sample C1T.
From: Ice stream motion facilitated by a shallow-deforming and accreting bed
(a) Visualization of the segmented bulk phase interpreted as skeleton particles. Within what is a complex arrangement of particles (n≥120,000), it is possible to identify chains of particles reflecting two geometries, one dipping up-glacier by ∼24° and the other dipping down glacier at ∼10° (it is noteworthy that the angles look steeper in the image due to the transposing of a 3D volume onto a 2D surface). (b) Identification of the two main particle chain geometries, which are interpreted as representing the P- and R-type Riedel sets identified in thin section. (c) Rose diagrams and contoured stereoplots of particle fabrics (aspect ratio >1.5:1) from sample C1T. The large data set of fabric analysis permits the partitioning of particle fabric data by particle size and identifies that the multiple modes recorded in the full fabric data are a consequence of systematic orientation of particle size fractions either parallel or transverse to ice-flow direction. Original rose diagram eigenvectors and eigenvalues can be found in Supplementary Table 2.
