Figure F58. Photomicrograph showing diabase porphyroclast within a gabbro cataclasite. The zone of lighter-colored material parallel to the margin of the porphyroclast may be a chilled margin or an alteration rind (Sample 209-1275D-1R-1, 110–113 cm) (cross-polarized light: blue filter; field of view = 2.75 mm; image 1275D-028).

Figure F58. Photomicrograph showing diabase porphyroclast within a gabbro cataclasite. The zone of lighter-colored material parallel to the margin of the porphyroclast may be a chilled margin or an alteration rind (Sample 209-1275D-1R-1, 110–113 cm) (cross-polarized light: blue filter; field of view = 2.75 mm; image 1275D-028).