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Vema Fracture Zone

MGDS_FeatureID lowest in hierarchy: 
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Notes on Vent Field Description: 
location approximately 10 42.6'N, 42 40.8'W in Devey et al. (2018) Site 8: "Even though the signal is below the threshold used in Baker et al. (2016) for the absolute decrease of Eh at a mid-ocean ridge hydrothermal site (2 mV), we are confident that the observed reduction is due to hydrothermal activity because a decrease in Eh was observed in two consecutive heaving-lowering sequences over several data points. As the signal was only observed by the ORP sensor attached to the CTD and not by the sensor 30 m above, the source can be concluded to have both low flow rate and low temperature. However, this is one of very few places where, up to now, hydrothermal emissions have been detected in the off-axis region..."
Year and How Discovered (if active, visual confirmation is listed first): 
2015 plume only
Discovery References (text): 
[Bonatti, E. et al., Copper-iron sulfide mineralizations from the equatorial Mid-Atlantic Ridge, Economic Geology(1976), 71 (8):1515-1525,];
[Rona et al., .Geol. Soc. Am. Bull., 87, 661-674, 1976];
Devey, C.W., et al. (2018) Habitat characterization of the Vema Fracture Zone and Puerto Rico Trench. Deep Sea Research II, 148, 7-20,;