Endeavour Segment, 47 57'N
PMS, polymetallic massive sulfides
Notes on Vent Field Description:
Large active sulfide deposits with minor metalliferous sediments and Fe-oxide gossans in the rift; numerous 20-30 m high structures; Endeavour Segment was U.S. Ridge 2000 Integrated Studies Site; node on the NEPTUNE Canada cabled observatory; Quebec is vent site just SW of MEF; area of Canadian marine protected area. Kelley et al (2012): >17 large, multi-flanged edifices that up until ~2005 had >100 black smoker chimneys. New chimneys initiated post 1999, but since then southern complex (Bastille) has been significantly waning. White smoker complex Cathedral formed ~1999-2000 (see http://media.marine-geo.org/video/video-cathedral-vent-complex-2000). Proximal diffuse flow sites common. Significantly perturbed events by 1999-2000 events. Near western valley wall along major north-south trending fissure/fault. Includes Raven discovered 2000 ROV Jason.
Notes Relevant to Biology:
Vestimentifera, gastropods, Alvinellidae, Ampharetidae, actinarians
Year and How Discovered (if active, visual confirmation is listed first):
1984 submersible Alvin; 1982 dredge only
Discovery References (text):
[Karsten, J. et al. EOS 65, 1111 (1984)]
Tivey & Delaney, Earth Planet. Sci. Lett., 77, 303-317, 1986, Growth of large sulfide structures on the endeavour segment of the Juan de Fuca ridge.
Other References (text):
Stakes, D. and Moore, W.S. (1991). Evolution of hydrothermal activity on the Juan de Fuca Ridge: Observations, mineral ages and Ra isotope ratios. J. of Geophys.Res., 96, 21,739-21,752, http://dx.doi.org/10.1029/91JB02038
JR Delaney et al., Geology of a vigorous hydrothermal system on the Endeavour segment, Juan de Fuca Ridge. J. Geophys. Res., 97, 19663-19682, 1992.
Kelley, D. et al. (2012). Endeavour Segment of the Juan de Fuca Ridge. Oceanography, Special Issue on Ridge 2000 Program Research, Vol 25, No.1, Mar 2012, 44-61