Plate P4. Photomicrographs of various vein minerals in Hole 735B. 1. Full thin section view of an amphibole + plagioclase vein cutting slightly foliated gabbro. Note the sharp but irregular vein margins (Sample 176-735B-19R-5, 62-73 cm). 2. Large, euhedral diopside crystals in plagioclase + diopside vein. Large crystals are located only near the vein wall. Note the Fe/Mg zoning in the crystals with the ratio increasing toward the margins (Sample 176-735B-69R-5, 31-41 cm). 3. Narrow carbonate veins cutting olivine gabbro. Note the rather irregular vein margins and the orientation of crystals within the vein (Sample 176-735B-91R-5, 81-86 cm). 4. Narrow natrolite vein filling crack in the center of a fine-grained felsic vein (Sample 176-735B-84R-6, 31-41 cm). All scale bars = 1 mm.

Plate P4. Photomicrographs of various vein minerals in Hole 735B. 1. Full thin section view of an amphibole + plagioclase vein cutting slightly foliated gabbro. Note the sharp but irregular vein margins (Sample 176-735B-19R-5, 62-73 cm). 2. Large, euhedral diopside crystals in plagioclase + diopside vein. Large crystals are located only near the vein wall. Note the Fe/Mg zoning in the crystals with the ratio increasing toward the margins (Sample 176-735B-69R-5, 31-41 cm). 3. Narrow carbonate veins cutting olivine gabbro. Note the rather irregular vein margins and the orientation of crystals within the vein (Sample 176-735B-91R-5, 81-86 cm). 4. Narrow natrolite vein filling crack in the center of a fine-grained felsic vein (Sample 176-735B-84R-6, 31-41 cm). All scale bars = 1 mm. Click on image or highlighted number to see enlargement.