Plate 1. Photomicrographs of carbonate veins from Leg 168 basalt specimens, taken using cathodoluminescence (CL). 4. Blocky and granular calcite vein with zoned CL intensity. The outside edge of most calcite crystals have brighter CL, indicating more luminescence activators in the zone. Sample 168-1032A-12R-1, Piece 1.