Fic:i,Distribution of sea-floor hydrothermal vents,and related mineral deposits.
Numbers refer to high-temperature frydrothermal vents and related polymetallic sulfide deposits (closed circles) listed in Table A1.
Other hydrothermal deposits and low-temperature vent sites, including Fe-Mn crusts metalliferous sediments, are indicated by open circles (see Han-uingtou et al, 1994, 2004, for details).
Major spreading rides and subductiou zones are indicated,