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Middle Valley, Dead Dog Vent Field
Name Alias(es):
Site 858, Middle Valley
MGDS_FeatureID lowest in hierarchy:
Vent Sites:
Heineken Hollow
Inspired Mounds
Chowder Hill
Puppy Dog
Activity:
Maximum Temperature:
276
Latitude:
48.4560
Longitude:
-128.7088
Location on map:
Ocean:
Region:
National Jurisdiction:
Maximum or Single Reported Depth (mbsl):
2450
Tectonic setting:
Full Spreading Rate (mm/a):
56.2
Host Rock:
MORB, minor E-MORB, sediment-hosted
Deposit Type:
PMS, polymetallic massive sulfides
Notes on Vent Field Description:
large active sulfide deposits within turbiditic sediments in a buried rift adjacent to Endeavour Ridge (up to 400 m explored dimension), 276°; metal poor fluids; position given for hole 858G
Notes Relevant to Biology:
NotProvided
Year and How Discovered (if active, visual confirmation is listed first):
1990 HOV Alvin
Discovery References (text):
Ames, D.E., et al., 1993. Mineralogy and geochemistry of active and inactive chimneys and massive sulfide, Middle Valley, northern Juan de Fuca Ridge: an evolving hydrothermal system. Can. Mineral., 31:997-1024
(Middle Valley SMS deposits only) EE Davis et al. (1987) Massive sulfides in a sedimented rift valley, northern Juan de Fuca Ridge. Earth Planet Sci Let 82: 49–61
[Goodfellow & Blaise, Can. Mineral., 26, 675-696, 1988, Sulfide formation and hydrothermal alteration of hemipelagic sediment in Middle Valley, northern Juan De Fuca Ridge].
Other References (text):
Butterfield et al., (1994) Geochemistry of hydrothermal vent fluids from Middle Valley, Juan de Fuca Ridge. In: Mottl, M.J., et al. (Eds.), Proc. ODP, Sci. Results, vol. 139, pp. 395–410
Cruse, AM and Seewald, JS (2006) Geochemistry of low-molecular weight hydrocarbons in hydrothermal fluids from Middle Valley, northern Juan de Fuca Ridge. Geochim Cosmochim Acta 70(8): 2073-2092.
RDF link: