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CIR, 19 29'S

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Notes on Vent Field Description: 
Dyment et al. (2000): "no active hydrothermal site has been observed, although evidence of pervasive hydrothermal circulation is widespread. This evidence includes the frequent occurrence of yellow-ish and orange products of alteration (sulfurs ?) on young pillow lava and the diffusion of shimmering water out of en-echelon fissures seen at one location"; German et al. (2001): cruise CD127 in 2001 "particle-rich anomalies were observed at 5 locations along ca. 300km of surveyed ridge-crest, including 4 sites all within the extended (hot-spot influenced) segment 15, which stretches from 18 deg 45 to 20 deg 14 min South"
Notes Relevant to Biology: 
Year and How Discovered (if active, visual confirmation is listed first): 
1988 plume only; 2000 submersible Nautile did not confirm activity
Discovery References (text): 
(plume only) Jean-Baptiste, P., et al. (1992), Hydrothermal 3He and manganese plumes at 19°29′S on the Central Indian Ridge, Geophys. Res. Lett., 19(17), 1787-1790.
Other References (text): 
Dyment et al. (2000) Deep-sea Exploration of the Central Indian Ridge at 19°S. InterRidge News 9(2): 29-32
German et al. (2001) Hydrothermal Activity Along the Central Indian Ridge: Ridges, Hotspots and Philately. American Geophysical Union, Fall Meeting 2001, abstract #OS42E-06.