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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
Maximum Temperature: 
Location on map: 
National Jurisdiction: 
Maximum or Single Reported Depth (mbsl): 
Tectonic setting: 
Full Spreading Rate (mm/a): 
Volcano Number (if applicable): 
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: 
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.