Figure F24. Schematic summary of evolution of hydrothermal activity and alteration at Site C0013. A. Eroded anhydrite veining/nodules lie within sediment on unaltered volcanic basement. B. Hydrothermal fluid discharge (red arrows) through the basement to the seafloor alters the volcanic rocks and sedimentary sequence and forms sulfide chimneys at the seafloor. (Continued on next page.)
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