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Rehu-Marka
Name Alias(es):
17 30'S, EPR
17 25'S, EPR
17.5 S, EPR
RM24
MGDS_FeatureID lowest in hierarchy:
Vent Sites:
Aldo
Chimney US#1
Kihi
Moxa
Nadir
Oasis
Rehu-Marka
Robbie'Roost
Soupape
Stanley
S-vent
Tanio
Activity:
Maximum Temperature:
376
Latitude:
-17.4333
Longitude:
-113.2000
Location on map:
Ocean:
Region:
National Jurisdiction:
Maximum or Single Reported Depth (mbsl):
2590
Minimum Depth (mbsl):
2575
Tectonic setting:
Full Spreading Rate (mm/a):
146.4
Volcano Number (if applicable):
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; http://www.pmel.noaa.gov/vents/s-epr.html; Charlou et al. (1996): "The largest site at 17 25'S (Nadir, Rehu-Marka vents) is nearly continuous for more than 1-km ...The 1984 observations (Renard et al., 1985) at the same site did not show the large fields of animals visible today"; Embley et al. (1998): "Dives with the French submersible Nautile in December 1993 observed young sheet flows and widespread venting centered on the segment’s shoalest point at 17 26'S."; hydrothermal plumes virtually continuous between 17 20' and 18 40'S; vent field named 17 30'S (Renard et al. 1985), 17 25'S (Auzende et al. 1996), 17.5 S (Embley et al. 1998); vent sites Kihi (17 27'S), Rehu Marka (17 24'S), Soupape (17 22'S); Haymon and White (2004) separate the 17 26'S, 17 34'S, 17 37'S, and 17 44' active fields on 3rd order ridge segments
Notes Relevant to Biology:
Renard et al. (1985) mention serpulid worms, pogonophorans, and shrimp; Auzende et al. (1996) has photos of Riftia, Tevnia, serpulids, Calyptogena, Bathymodiolus, anemones at periphery; 2004 BIOSPEEDO cruise noted alvinellids at chimneys, mussels, clams, and barnacles at Oasis, and rare vestimentiferans
Year and How Discovered (if active, visual confirmation is listed first):
1993 submersible Nautile; 1984 submersible Cyana - Auzende et al. (1996) says that no active black smokers were discovered but Krasnov et al. (1997) says one black smoker observed
Discovery References (text):
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)
Auzende et al. (1994) Activite magmatique, tectonique et hydrothermale actuelle sur la dorsale est Pacifique entre 17 et 19 S (campagne NAUDUR). C.R. Acad. Sci. Paris, Ser. 2, 319: 811-818
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, doi:10.1029/96JB01209.
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
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
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
Embley et al., Earth Planet. Sci. Lett. 163, 131-147, 1998, Geological, chemical, and biological evidence for recent volcanism at 17.5ºS: East Pacific Rise
O'Neill, J. H., Hydrothermal vents at 17° 25´S and 17° 37´S on the superfast-spreading EPR (abstract), Eos Trans. AGU, 79(45), Fall Meet. Suppl., F817, 1998
Haymon and White (2004) Fine-scale segmentation of volcanic/hydrothermal systems along fast-spreading ridge crests. Earth and Planetary Science Letters 226: 367-382
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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