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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:
Bordreaux
Grande cheminee
Jasmine
Les trois diffuseurs
Natasha&Boris
Activity:
Maximum Temperature:
354
Latitude:
-21.4333
Longitude:
-114.2917
Location on map:
Ocean:
Region:
National Jurisdiction:
Maximum or Single Reported Depth (mbsl):
2850
Minimum Depth (mbsl):
2800
Tectonic setting:
Full Spreading Rate (mm/a):
148.7
Host Rock:
MORB
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.
RDF link: