Plate P5. Photomicrographs of vein minerals in Hole 735B. 1. A felsic patch in gabbro in which amphibole is replacing plagioclase (irregular, light gray patch on right side). The amphibole is strongly zoned from dark brown to light brown and from dark gre

Plate P5. 1. A felsic patch in gabbro in which amphibole is replacing plagioclase (irregular, light gray patch on right side). The amphibole is strongly zoned from dark brown to light brown and from dark green to light green. The brown amphibole is edenite to magnesio-hornblende, and the green amphibole is actinolite and ferro-actinolite (Sample 176-735B-202R-7, 96-101 cm). All scale bars = 1 mm.