PMS, polymetallic massive sulfides
Notes on Vent Field Description:
Krasnov et al. (1997): "The probable hydrothermal field near 21 54'S on the eastern flank of the rift axis is located in a deval zone"; segment between the 21 44' and 22 08'S OSCs; old InterRidge vents database for 21 50'S, EPR at 2600 m: "small vent fields with active sulfide deposits in the axial rift"
Notes Relevant to Biology:
Krasnov et al. (1997): "Near 21 54'S bivalves on sediments are suggestive of a near-by hydrothermal field"
Year and How Discovered (if active, visual confirmation is listed first):
1987-1988 deposits only [need to check Fouquet et al. (1993) for confirmation]
Discovery References (text):
[Fouquet et al., Terra Abstracts, 5, suppl. 1, 444-445, 1993, likely from EUG VII, Strasbourg, 4–8 April 1992]
(deposits only) Krasnov et al., (1997) Morphotectonics, Volcanism and Hydrothermal Activity on the East Pacific Rise between 21º12'S and 22º40'S. Marine Geophysical Researches 19: 287–317.