Figure F34. Vesicular, hydrothermally altered, aphyric basalt close to the contact with the sedimentary sequence overlaying the basement. The piece is crosscut by several large veins of sedimentary material, carbonate, and green angular fragments of glassy basalt (hyaloclastite). The veins are accompanied by large halos showing different colors. Thin veins of reddish iron oxyhydroxide are also visible (interval 195-1201D-46R-1, 24-66 cm).

Figure F34. Vesicular, hydrothermally altered, aphyric basalt close to the contact with the sedimentary sequence overlaying the basement. The piece is crosscut by several large veins of sedimentary material, carbonate, and green angular fragments of glassy basalt (hyaloclastite). The veins are accompanied by large halos showing different colors. Thin veins of reddish iron oxyhydroxide are also visible (interval 195-1201D-46R-1, 24-66 cm).