Figure F20. Photograph of Shinkai 6500 sample 425-R007, a ~45-cm-long peridotite mylonite, recovered from a planar, striated outcrop surface dipping ~20° to the west, just a few tens of meters from the site of Hole 1270A. Textures in this sample record localized mylonitic deformation of peridotite at ~600°C, strikingly different from textures in peridotites from Holes 1270A, 1270C, and 1270D, which record protogranular to mildly porphyroclastic deformation at temperatures >1000°C, except within a few millimeters of gabbro-hosted, higher-temperature, mylonitic shear zones.

Figure F20. Photograph of Shinkai 6500 sample 425-R007, a ~45-cm-long peridotite mylonite, recovered from a planar, striated outcrop surface dipping ~20° to the west, just a few tens of meters from the site of Hole 1270A. Textures in this sample record localized mylonitic deformation of peridotite at ~600°C, strikingly different from textures in peridotites from Holes 1270A, 1270C, and 1270D, which record protogranular to mildly porphyroclastic deformation at temperatures >1000°C, except within a few millimeters of gabbro-hosted, higher-temperature, mylonitic shear zones.