Figure 8. (A) True-scale cross section and (B) longitudinal section of Pual Ridge (see transect lines on Fig. 7), showing inferred subsurface geology and presumed mixing between magmatic fluids and circulating seawater—models to be tested during Leg 193. Zones of progressively higher temperature alteration are expected to be telescoped under the focused vent site with massive sulfide chimneys relative to the situation under the diffuse venting zone at Snowcap. Leg 193 is not expected to intersect the main intrusive body but might cut some smaller apophyses. mbsl = meters below sea level. T = temperature.