Abstract
A scientific team aboard the R/V Maurice Ewing conducted a fine‐scale examination of the hydrogeology of two areas of active venting in Middle Valley, northern Juan de Fuca Ridge. Earlier expeditions had identified moderate‐to‐high temperature vent activity at the two sites, as well as by‐products of hydrothermal processes: sediment alteration; massive, disseminated sulfide deposits; and extensive vent faunal communities. Preliminary analyses of new data reflecting fluid, heat, and chemical fluxes suggest that the flows are complex in their distributions, have a significant hydrothermal recharge within the vent areas, and may be more vigorous than previously thought.
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