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Pescadero Basin, Auka

MGDS_FeatureID lowest in hierarchy: 
Maximum Temperature: 
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Maximum or Single Reported Depth (mbsl): 
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Notes on Vent Field Description: 
spreading segment north of Alarcon Rise; list of vent sites is pending determination of synonyms (Gatito de la Fumarola, Matterhorn, Mermaid Castle, Z chimney); position and temperature is given for Z chimney depth 3664 m on ROV Doc Ricketts Dive 748 in 2015; Gatito de la Fumarole, 23.958064, -108.862222, 3673 m; MBARI website, accessed 11 May 2015, "290 degrees Celsius clear hydrothermal vent fluid and mainly carbonate chimney samples", "unexpected discovery of high-temperature carbonate chimneys with distinctive animals communities in Pescadero Basin."; note MBARI press release, 2 June 2015, "Lying more than 3800 meters (12500 feet) below the surface, the Pescadero Basin vents are the deepest high-temperature hydrothermal vents ever observed in or around the Pacific Ocean. They are also the only vents in the Pacific known to emit superheated fluids rich in both carbonate minerals and hydrocarbons.", "The Pescadero Basin is only the second place in the world where carbonate chimneys (instead of ones made primarily of sulfides) have been found in the deep sea."; MBARI YouTube video, accessed 10 June 2015,
Notes Relevant to Biology: 
MBARI website, accessed 11 May 2015, "thousands of Oasisia tubeworms (red plume with brown tube) and numerous purple scale worms (Archinome levinae, a new species named in 2013)",, "Perhaps our most striking observations were the differences in biological communities inhabiting the Pescadero and Alarcón hydrothermal vents versus the Pescadero transform-fault cold seeps"
Year and How Discovered (if active, visual confirmation is listed first): 
2015 ROV Doc Ricketts
Discovery References (text): 
MBARI website, accessed 11 May 2015,