Figure F1. This representative close-up photograph of fresh to slightly altered dacite recovered from Site 1190 shows a black, moderately vesicular, and superficially aphyric volcanic rock. However, careful observation and thin-section petrography show that the glassy to microcrystalline groundmass contains as much as 3 vol% of plagioclase, clinopyroxene, and minor magnetite phenocrysts (interval 193-1190B-2R-1, 28-34 cm).

Figure F1. This representative close-up photograph of fresh to slightly altered dacite recovered from Site 1190 shows a black, moderately vesicular, and superficially aphyric volcanic rock. However, careful observation and thin-section petrography show that the glassy to microcrystalline groundmass contains as much as 3 vol% of plagioclase, clinopyroxene, and minor magnetite phenocrysts (interval 193-1190B-2R-1, 28-34 cm).