MAR, south of 15 20'N fracture zone

Name Alias(es):

MGDS_FeatureID lowest in hierarchy:

MAR

Vent Sites:

Activity:

active, inferred

Maximum Temperature:

Latitude:

15.0833

Longitude:

-45.0000

Location on map:

Ocean:

N. Atlantic

Region:

N MAR

National Jurisdiction:

high seas

Maximum or Single Reported Depth (mbsl):

3000

Minimum Depth (mbsl):

Tectonic setting:

mid-ocean ridge

Full Spreading Rate (mm/a):

25.5

Volcano Number (if applicable):

Host Rock:

NotProvided

Deposit Type:

NotProvided

Notes on Vent Field Description:

The low TDM/CH4 ratio contrasted with the higher TDM/CH4 ratios found in plumes emitted by high- temperature venting ... and was interpreted as an indicator of ongoing hydrothermal venting associated with seafloor exposures of serpentinized peridotite

Notes Relevant to Biology:

Year and How Discovered (if active, visual confirmation is listed first):

1988 plume only; 1992 submersible Nautile did not observe active vents

Discovery References (text):

(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.

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