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EPR, 21 N

Name Alias(es): 
MGDS_FeatureID lowest in hierarchy: 
Vent Sites: 
Clam Acres
Maximum Temperature: 
Location on map: 
National Jurisdiction: 
Maximum or Single Reported Depth (mbsl): 
Minimum Depth (mbsl): 
Tectonic setting: 
Full Spreading Rate (mm/a): 
Volcano Number (if applicable): 
Host Rock: 
Deposit Type: 
PMS, polymetallic massive sulfides
Notes on Vent Field Description: 
first discovery of high-temperature, seafloor massive sulfide deposits on mid-ocean ridge; small vent fields with active sulfide deposits in the axial rift, both high-temperature (>350 C) and low temperature (<20 C) venting; Mexican MPA as of 2009
Notes Relevant to Biology: 
Vestimentifera, Mytilidae, Vesicomyidae, Alvinellidae, Bythograeidae, Zoarcidae
Year and How Discovered (if active, visual confirmation is listed first): 
1979 submersible Alvin; 1978 submersible Cyana discovered mineral deposits only
Discovery References (text): 
(first observations of SMS) Francheteau, J. et al (1979) Massive deep-sea sulphide ore deposits discovered on the East Pacific Rise. Nature 277: 523-528
(first discovery of "black smoker" vents) Spiess, F.N., et al. (1980) East Pacific Rise: Hot Springs and Geophysical Experiments. Science 207(4438): 1421-1433.
Other References (text): 
Zierenberg, R.A. et al. (1984) Massive sulfide deposits at 21 degrees N, East Pacific Rise
chemical composition, stable isotopes, and phase equilibria. Geol. Soc. Am. Bull. 95(8): 922-929.