Figure F8. Photomicrographs of samples from Site 463 (all in plane-polarized light). A. White fragments are moderately to slightly vesicular blocky glass replaced by zeolite in an altered tuff. B. Altered tuff with clay matrix (brown) and microporous volcanic lithic fragments (blue). C. Radiolarite where delicate radiolarians have been replaced by pyrite (black) and infilled by carbonate (white).

Figure F8. Photomicrographs of samples from Site 463 (all in plane-polarized light). A. White fragments are moderately to slightly vesicular blocky glass replaced by zeolite in an altered tuff. B. Altered tuff with clay matrix (brown) and microporous volcanic lithic fragments (blue). C. Radiolarite where delicate radiolarians have been replaced by pyrite (black) and infilled by carbonate (white).