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Name Alias(es): 
SWIR, Plume 4
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: 
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Notes on Vent Field Description: 
Convincing evidence of active hydrothermal circulation on an ultra-slow ridge was first discovered in 1997 at several locations between 58.2° and 65.8°E on the Southwest Indian Ridge (SWIR) during a plume survey using optical sensors; this listing combines "SWIR, 63.5 E" from previous version of the database, which was listed at -27.9507, 63.5414; Tao et al. (2009): "A hydrothermal field combined with ultramafic rocks was found at 63.5°E...CH4, Eh, H2S and temperature anomalies were detected. Massive sulfide, oxidized chimney and sediment were sampled. Serpentinized ultramafic rocks were recovered at a nearby site. This would be the first ultramafic-hosted hydrothermal system found at SWIR."
Notes Relevant to Biology: 
see Zhou, Y. et al. (2018)
Year and How Discovered (if active, visual confirmation is listed first): 
2014 HOV Jiaolong; 1997 plume only; 2009 DY115-20 Leg 7 plume and deposits;
Discovery References (text): 
(plume only) German et al., Nature 395, 490-493, 1998, Hydrothermal activity along the southwest Indian ridge.
(plume and deposits) Tao et al. (2009) New hydrothermal fields found along the SWIR during the Legs 5-7 of the Chinese DY115-20 Expedition. AGU Fall Meeting abstract #OS21A-1150.
Zhou, Y. et al. (2018) Characterization of vent fauna at three hydrothermal vent fields on the Southwest Indian Ridge: Implications for biogeography and interannual dynamics on ultraslow-spreading ridges. Deep Sea Research Part I: Oceanographic Research Papers 137: 1-12,