Figure F18. Examples of deformation structure that is recorded in some Hole U1309D rocks. A. Whole thin section of Sample 304-U1309D-8R-1, 68–71 cm, showing a well-defined mylonite in gabbro cut by a fracture. B. Brown amphibole vein crosscuts highly localized shear zone in a mylonite with domains of recrystallized plagioclase and pyroxene (Sample 304-U1309D-9R-1, 71–73 cm) (field of view = 4 mm).