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MAR, 14 54'N

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Notes on Vent Field Description: 
this field was not observed on 2004 cruise (Kuhn et al. 2004); Eberhardt et al. (1988): "The rift valley at site 3 (14°54 N), with postulated extrusive volcanic activity and a stage in valley evolution tending toward a U-shape, shows evidence of hydrothermal activity within the slightly faster spreading eastern inner wall."; Fouquet et al. (2008 InterRidge News) cite Eberhardt et al. (1988): "Sulfide-like deposits were found and photographed at 14°54’N near the foot of the eastern wall of the rift valley"
Notes Relevant to Biology: 
Year and How Discovered (if active, visual confirmation is listed first): 
1988 or earlier seafloor photographs did not confirm hydrothermal activity
Discovery References (text): 
[Eberhart et al., Geologic controls of hydrothermal activity in the Mid-Atlantic Ridge rift valley: Tectonics and volcanics. Mar. Geophys. Res., 10, 233-239, 1988]
(plume only) Charlou et al, Geochim. Cosmochim. Acta, 55, 3209-3222, 1991, Different TDM/CH4 hydrothermal plume signatures: TAG site at 26°N and serpentinized ultrabasic diapir at 15°05′N on the Mid-Atlantic Ridge.
Other References (text): 
Charlou et al., Intense CH4 plumes generated by serpentinization of ultramafic rocks at the intersection of the 15°20′N fracture zone and the Mid-Atlantic Ridge, Geochim. Cosmochim. Acta, 62, 2323-2333, 1998
Kuhn et al. (2004) The Logatchev hydrothermal field - revisited: Preliminary results of the R/V Meteor cruise HYDROMAR I (M60/3). InterRidge News 13: 1-4.