Figure F31. Veins with black alteration halos. A. Saponite vein is flanked by a black alteration halo (interval 301-U1301B-1R-1 [Piece 8, 58–64 cm]). B. Dark gray background alteration with saponite-filled vesicles, cut by an iron oxyhydroxide vein with a black alteration halo (interval 301-U1301B-1R-1 [Piece 15, 118–124 cm]) (photograph is of a wet surface).
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