Endeavour Segment, 47 58'N
PMS, polymetallic massive sulfides
Notes on Vent Field Description:
Large active sulfide deposits in the rift valley (numerous 20-30 m high structures); currently site of most vigorous hydrothermal activity; note: Clam Bed is considered a separate field to the SW of High Rise by Skebo et al. (2006) and by M. Hannington; area of Canadian marine protected area. Kelley et al (2012): Near centre of valley on summit and sides of elongate horst. Similar to SD and MEF. Flanges are common. Current site of most intense hydrothermal and seismic activity. Clam Bed diffuse + smoker site is ~0.5 km to the south. Largest structure Godzilla rose 45 m above the seafloor, but collapsed in 1995-1996.
Notes Relevant to Biology:
Vestimentifera, gastropods, Alvinellidae, Ampharetidae, actinians
Year and How Discovered (if active, visual confirmation is listed first):
Discovery References (text):
Delaney et al., J. Geophys. Res., 97, 19663-19683, 1992, Geology of a vigorous Hydrothermal System on the Endeavour Segment, Juan de Fuca Ridge
Robigou et al., Geophys. Res. Lett., 20, 1887-1890, 1993, Large massive sulfide deposits in a newly discovered active hydrothermal system, The High-Rise Field, Endeavour Segment, Juan De Fuca Ridge.
Other References (text):
Skebo, K. et al. (2006) Spatial patterns of zooplankton and nekton in a hydrothermally active axial valley on Juan de Fuca Ridge. Deep Sea Research I 53: 1044-1060.
Kelley, D. et al. (2001). Geology and venting characteristics of the Mothra Hydrothermal Field, Endeavour Segment, Juan de Fuca Ridge. Geology 29:959-962
Kellogg, J.P. and McDuff, R.E. (2010). A hydrographic transient above the Salty Dawg hydrothermal field, Endeavour Segment, Juan de Fuca Ridge. geochemistry Geophysics Geosystems 11, Q12001, http://dx.doi.org/10.1029/2010GC003299
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