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EPR, 7 25'S
Name Alias(es):
7.4 S, EPR
7 30'S, EPR
7 S, EPR
MGDS_FeatureID lowest in hierarchy:
Vent Sites:
Last Hope
Petite cheminee
Sarah's Spring
White Christmas
Activity:
Maximum Temperature:
340
Latitude:
-7.4167
Longitude:
-107.8000
Location on map:
Ocean:
Region:
National Jurisdiction:
Maximum or Single Reported Depth (mbsl):
2750
Minimum Depth (mbsl):
2700
Tectonic setting:
Full Spreading Rate (mm/a):
136.6
Host Rock:
MORB
Deposit Type:
PMS
Notes on Vent Field Description:
GEOMETEP cruises with TV grab included SO 40 in 1985/1986 and SO 62 in 1989; Jollivet et al. (2004) re-located White Christmas and Sarah's Spring but there was "a noticeable lack of venting" but then they found black smoker Last Hope; White Christmas (7 21'S), Sarah's Spring (7 25'S), Last Hope (7 25'S)
Notes Relevant to Biology:
Halanych et al. (1999): Tevnia, Riftia, anemones, stauromedusae, bythograeid crabs, ophiuroids; 2004 BIOSPEEDO cruise noted anemones and mussels at Sarah's Spring and alvinellids at Last Hope
Year and How Discovered (if active, visual confirmation is listed first):
1985/86 or 1989 TV grab (need to check references to confirm activity); 1998 submersible Alvin
Discovery References (text):
[(TV grab) Holler (1993) Erscheinungsformen hydrothermaler Aktivität am Ostpazifischen Rücken zwischen 6° und 30° Süd. University of Göltingen. Verlag Shaker, 226 pp. (German dissertation)]
[(TV grab) Marchig et al., 1997, Massive sulfide chimneys from the East Pacific Rise at 7 24'S and 16 43'S. Marine Georesources & Geotechnology 15: 49-66]
(submersible observations) Lupton, J., et al., Gas chemistry of hydrothermal fluids along the East Pacific Rise, 5°S to 32°S, Eos Trans. AGU, 80(46) Fall Meet. Suppl., F1099, 1999.
Other References (text):
Dill et al. (1992) Hydrothermal alteration and mineralisation of basalts from the spreading zone of the East Pacific Rise (7 S-23 S). Geologische Rundschau/ International Journal of Earth Sciences, 81: 717-728.
Halanych et al., 1999, Brief description of biological communities at 7 S on the East Pacific Rise, InterRidge News 8(2): 23-27
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: