Figure F45. Sketch and photograph of a hand specimen from interval 185-801C-44R-3, 3-11 cm. The medium-grained diabase is cut by several generations of veins predominantly composed of saponite and carbonate. Alteration halos have developed around the earliest veins (A-D) that are filled with mostly saponite. No alteration halos formed around later irregular veins composed typically of carbonate. Crosscutting relationships constrain the following vein chronology: (1) Veins A, B, C, and D, originally thin and filled with saponite. Thin dark green alteration halos could be associated with these veins. (2) Carbonate veins E, F, and G, filling open fractures. No alteration halos formed along these veins. (3) Reactivation of the earliest veins with possible rotation or translation of blocks (A, B, and C). Reopening and carbonate filling is recorded in vein A and to a lesser degree in vein D. Overprinting of large, mixed brown and dark halos is observed. The quality of the image reflects the AMST source.