EPR, Ridge 1, 20 40'S

Name Alias(es):

20 50'S, EPR

MGDS_FeatureID lowest in hierarchy:

18S-22S

Activity:

active, confirmed

Max Temperature Category:

NotProvided

Latitude:

-20.8333

Longitude:

-114.1667

Location on map:

Ocean:

S. Pacific

Region:

S EPR

National Jurisdiction:

high seas

Maximum or Single Reported Depth (mbsl):

3000

Tectonic setting:

mid-ocean ridge

Full Spreading Rate (mm/a):

148.5

Volcano Number (if applicable):

Host Rock:

MORB

Deposit Type:

PMS

Notes on Vent Field Description:

southern spreading center of propagating rift; MacDonald et al. (1988): "characterized by active hydrothermal vents and vent faunal communities at four sites between 20 56' and 20 49'S"

Notes Relevant to Biology:

NotProvided

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

1983 Deep Tow camera

Discovery References (text):

Macdonald et al., J. Geophys. Res. 93, 2875-2898, 1988, Deep-Tow and Sea Beam Studies of Dueling Propagating Ridges on the East Pacific Rise Near 20 40'S

Other References (text):

Dill et al. (1992) Hydrothermal alteration and mineralisation of basalts from the spreading zone of the East Pacific Rise (7 S-23 S). Geologische Rundschau/ International Journal of Earth Sciences, 81: 717-728.

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