Figure F121. A. Close-up photograph of basalt highly altered to low-temperature hydrothermal assemblage of celadonite, silica, iron oxyhydroxide, and secondary feldspar. Patchy color variations reflect the abundance of iron oxyhydroxide. Millimeter-scale amygdules are lined with celadonite and iron oxyhydroxide and filled with calcium carbonate and silica. Sharp contact with less altered dark gray basalt cuts diagonally across the core at 116-120 cm (interval 206-1256D-57R-2, 110-138 cm, whole-round core). B. Close-up photograph of basalt highly altered to low-temperature hydrothermal assemblage of celadonite, silica, iron oxyhydroxide, and secondary feldspar (interval 206-1256D-57R-3, 0-17 cm, whole-round core).

Figure F121. A. Close-up photograph of basalt highly altered to low-temperature hydrothermal assemblage of celadonite, silica, iron oxyhydroxide, and secondary feldspar. Patchy color variations reflect the abundance of iron oxyhydroxide. Millimeter-scale amygdules are lined with celadonite and iron oxyhydroxide and filled with calcium carbonate and silica. Sharp contact with less altered dark gray basalt cuts diagonally across the core at 116-120 cm (interval 206-1256D-57R-2, 110-138 cm, whole-round core). B. Close-up photograph of basalt highly altered to low-temperature hydrothermal assemblage of celadonite, silica, iron oxyhydroxide, and secondary feldspar (interval 206-1256D-57R-3, 0-17 cm, whole-round core).