You are here

EPR, 21 25'S

Name Alias(es): 
21 S, EPR
21.5 S, EPR
21 30'S, EPR
MGDS_FeatureID lowest in hierarchy: 
Vent Sites: 
Grande cheminee
Les trois diffuseurs
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: 
small vent fields with active sulfide deposits in the axial rift; note: S. Petersen splits this field into 1 at 21 25'S and 1 at 21 29'S; well-defined, 50-m deep, 1-km wide axial graben; Renard et al. (1985) report active chimneys up to 30-m height
Notes Relevant to Biology: 
Renard et al. (1985) observed dead mussel shells; 2004 BIOSPEEDO cruise notes alvinellids at Bordreaux and Natasha&Boris
Year and How Discovered (if active, visual confirmation is listed first): 
1984 submersible Cyana; 1983 deposits only
Discovery References (text): 
(deposits only) Backer et al., Hydrothermal activity and sulphide formation in axial valleys of the East Pacific Rise crest between 18 and 22°S, Earth Planet. Sci. Lett., 72, 9-22, 1985
Renard, V. et al., Earth Planet. Sci. Lett., 75, 339-353, 1985, Submersible observations at the axis of the ultra-fast-spreading East Pacific Rise (17°30' to 21°30'S).
Other References (text): 
[Tufar and Naser (1991) Forschungsfahrt SONNE 63–OLGA I
Krasnov et al., Okeanologia UDK 551.234-265-12 32 557 566, 1992]
Krasnov et al., (1997) Morphotectonics, Volcanism and Hydrothermal Activity on the East Pacific Rise between 21º12'S and 22º40'S. Marine Geophysical Researches 19: 287–317
Jollivet, D. et al. (2004) The BIOSPEEDO cruise: a new survey of hydrothermal vents along the South East Pacific Rise from 7 24'S to 21 33'S. InterRidge News 13: 20-26.