Figure F31. Photomicrograph showing alteration of the gabbro drilled in Hole 1270B is dominated by chlorite (chl)–amphibole (amp) assemblages that form at the contacts of pyroxene (px) and plagioclase crystals (Sample 209-1270B-7R-1, 47–49 cm) (plane-polarized light: blue filter; field of view = 0.7 mm; image 1270B_004).