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EPR, 18 26'S
Name Alias(es):
RM28
18.5 S, EPR
18 30'S, EPR
MGDS_FeatureID lowest in hierarchy:
Vent Sites:
Asyulaik
Cathedral
Fromveur
Le Stiff
Stockwork
Sojourn
Wall Street
Activity:
Maximum Temperature:
382
Latitude:
-18.4333
Longitude:
-113.3833
Location on map:
Ocean:
Region:
National Jurisdiction:
Maximum or Single Reported Depth (mbsl):
2650
Minimum Depth (mbsl):
Tectonic setting:
Full Spreading Rate (mm/a):
147.0
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; Renard et al. (1985) mentioned inactive chimneys at this site; note: "HUMP zone" in Auzende et al. (1996) extends from 18 22' to 18 37'S; hydrothermal plumes virtually continuous between 17 20' and 18 40'S
Notes Relevant to Biology:
Renard et al. (1985) observed dead clam shells; 2004 BIOSPEEDO cruise noted lack of fauna except alvinellids at Fromveur and crabs, serpulids, and anemones at Cathedral
Year and How Discovered (if active, visual confirmation is listed first):
1993 submersible Nautile; 1983 seafloor photos, temperature anomalies, and deposits did not confirm activity; 1984 submersible Cyana observed only inactive sites; 1985/86 or 1989 TV grab (need to check references to confirm activity)
Discovery References (text):
(seafloor photos, temperature anomalies, and deposits) 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
(inactive only) 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)
[(TV grab) Holler (1993) Erscheinungsformen hydrothermaler Aktivität am Ostpazifischen Rücken zwischen 6° und 30° Süd. University of Göltingen. Verlag Shaker, 226 pp. (German dissertation)]
JM Auzende et al. (1996) Recent tectonic, magmatic, and hydrothermal activity on the East Pacific Rise between 17°S and 19°S: Submersible observations. J Geophys Res 101(B8): 17995-18010.
Other References (text):
(plume only) Baker, E., and T. Urabe (1996) Extensive distribution of hydrothermal plumes along the superfast spreading East Pacific Rise, 13°30′-18°40′S, J. Geophys. Res., 101(B4), 8685-8695
Charlou et al., J. Geophys. Res., 101, 15899-15919, 1996, Mineral and gas chemistry of hydrothermal fluids on an ultrafast spreading ridge: East Pacific Rise, 17° to 19°S (Naudur cruise, 1993) phase separation processes controlled by volcanic and tectonic activity
Urabe et al. (1998) Japanese Ridge Flux Project Group has started long-term seafloor monitoring in the southern East Pacific Rise. InterRidge News 7(1): 41-44
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.
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