NFS, hydrothermal deposits
Notes on Vent Field Description:
Leybourne and Van Wagoner (1992): photographs of "Newly discovered hydrothermal sulphide mounds and chimneys are spatially associated with moderately young pillow and lobate flows near the base of a small axial volcano", "hydrothermal field tracked over a distance of 60 m... It is possible that some of these chimneys are active, as evidenced by a slight shimmer in the video"
Year and How Discovered (if active, visual confirmation is listed first):
1987 and 1988 deposits only (towed camera did not confirm activity)
Discovery References (text):
Leybourne & Van Wagoner, Can. J. Earth Sci., 29, 2346-2352, 1992, Volcanism, age, and hydrothermal deposits of the West Valley Segment, Juan de Fuca Ridge.