Plate P2. Photomicrographs of diabase from Site 1118. 1. Undeformed fine-grained diabase. Note the presence of chlorite patches replacing clinopyroxene (plane-polarized transmitted light). 2. Undeformed pegmatitic diabase. Note the abrupt reduction of spectacular dendritic iron oxide (plane-polarized transmitted light). 3. Contact between a coarse-grained diabase and a fine-grained diabase. Note the abrupt reduction in grain size across the contact (plane-polarized transmitted light). 4. Grain size reduction in the brecciated diabase (cross-polarized transmitted light). Cpx = clinopyroxene, Plg = plagioclase, Ilm = ilmenite, Chl = chlorite.

Plate P2. Photomicrographs of diabase from Site 1118. 1. Undeformed fine-grained diabase. Note the presence of chlorite patches replacing clinopyroxene (plane-polarized transmitted light). 2. Undeformed pegmatitic diabase. Note the abrupt reduction of spectacular dendritic iron oxide (plane-polarized transmitted light). 3. Contact between a coarse-grained diabase and a fine-grained diabase. Note the abrupt reduction in grain size across the contact (plane-polarized transmitted light). 4. Grain size reduction in the brecciated diabase (cross-polarized transmitted light). Cpx = clinopyroxene, Plg = plagioclase, Ilm = ilmenite, Chl = chlorite.