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Alarcon Rise, Meyibo

Name Alias(es): 
MGDS_FeatureID lowest in hierarchy: 
Vent Sites: 
Meyibo S
Meyibo N
Maximum Temperature: 
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Maximum or Single Reported Depth (mbsl): 
Minimum Depth (mbsl): 
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Full Spreading Rate (mm/a): 
Volcano Number (if applicable): 
Host Rock: 
Deposit Type: 
Notes on Vent Field Description: 
southernmost spreading center in Gulf of California, a northern segment of the East Pacific Rise; position is given for Meyibo S cluster, 2291 m, Meyibo N 23.357396, -108.54247, 2286 m, Pericu 23.363317, -108.538062, 2295 m; temperature 354 C at Meyibo N and 340 C at Meyibo S on ROV Doc Ricketts Dive 743 in 2015; MBARI website, accessed 8 May 2015,, "In 2003, Clague and his colleague Robert Vrijenhoek spent two dives unsuccessfully searching for vents within just a few kilometers of the newly discovered site.", "The active hydrothermal vents and young, glassy lava flows we found during our April 22 dive are on the shallowest and broadest area of the Alarcon Ridge neovolcanic zone.", April 22 dive D392; Clague et al. (2012): "Mapping data also reveal the presence of about 110 apparent hydrothermal chimney structures as tall as 18 m, scattered along roughly the central half of the Rise. Subsequent ROV dives observed 70 of these structures and found active venting at 22 of them in two areas within the large sheet flow on the inflated portion of the ridge. Fluid temperatures exceed 300 C"; MBARI website, accessed 11 May 2015, 2015 ROV Doc Ricketts Dive 743 "officially name this hydrothermal site Pericu", "Temperatures of the spewing hydrothermal fluids exceeded 350 degrees Celsius", on-axis "near the fissure of the most recent lava flow at this ridge segment"
Notes Relevant to Biology: 
MBARI website, accessed 8 May 2015,, tubeworm Riftia sp., squat lobsters, clam Calyptogena sp.; Clague et al. (2012): "extensive vent communities that superficially resemble those at [EPR] 21 N with robust clumps of Riftia pachyptila and fields of mostly dead Calyptogena magnifica"
Year and How Discovered (if active, visual confirmation is listed first): 
2012 ROV Doc Ricketts
Discovery References (text): 
Clague, D., et al. (2012) Geology of the Alarcon Rise Based on 1-m Resolution Bathymetry and ROV Observations and Sampling. American Geophysical Union, Fall Meeting 2012, abstract #T44A-04.
Other References (text): 
Marlow, J. (2012) How to discover deep-sea hydrothermal vents. Wired magazine, accessed online 5 May 2015: