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Middle Valley, ODP Mound

Name Alias(es): 
Site 856, Middle Valley
MGDS_FeatureID lowest in hierarchy: 
Vent Sites: 
Lone Star
Shiner Bock
Maximum Temperature: 
Location on map: 
National Jurisdiction: 
Maximum or Single Reported Depth (mbsl): 
Minimum Depth (mbsl): 
Tectonic setting: 
Full Spreading Rate (mm/a): 
Volcano Number (if applicable): 
Host Rock: 
MORB, minor E-MORB, sediment-hosted
Deposit Type: 
Notes on Vent Field Description: 
ODP Mound (Hole 1035H) is located ~300 m south of the Bent Hill MS deposit; prior to ODP 169 drilling 1996, Lone Star was the only known vent; Shiner Bock vent confirmed 1998; Spire observed after 1998; Cruse et al. abstract GSA 2003: "ODP Mound is presently venting ~270°C degree fluids at several locations. In July 2000 hydrothermal fluids were collected at Shiner Bock and Spire vents, and ODP Hole 1035H that started venting high-temperature fluids following drilling in 1996."
Notes Relevant to Biology: 
Year and How Discovered (if active, visual confirmation is listed first): 
1992 or earlier towed video
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.
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.