Figure F4. Close-up photographs (half-core and whole-round core images) of patchy alteration and halos encountered in different units, Hole U1382A. A. Aphyric basalt from Unit 1 (massive flow) showing darker gray (freshest) basalt surrounded by grayish-brown alteration halos (interval 336-U1382A-2R-1, 90–112 cm [Piece 11]). B. Highly porphyritic basalt from Unit 6 (massive flow) showing darker gray (freshest) basalt with white plagioclase phenocrysts surrounded by grayish-brown alteration halos (interval 336-U1382A-10R-1, 85–107 cm [Piece 10]). C. Harzburgite with granular texture from Unit 5 (sedimentary breccia) showing a brown to green pseudomorphic alteration halo along a 3 mm thick carbonate vein (interval 336-U1382A-8R-4, 51–63 cm [Piece 5]).
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