 Faults which host the hydrothermal flow can show evidence of this flow due to development of massive sulfide veins, hydrothermal breccias, quartz and carbonate veining and pervasive ankerite-siderite-chlorite-sericite alteration.Fluids eventually discharge onto the seafloor, forming areally extensive, stratiform deposits of chemical precipitates.Discharge zones can be breccia diatremes, or simple fumarole conduits.