basalts to shoshonites, dacite
Notes on Vent Field Description:
9.3 deg C fluid venting from base of mound of lava rubble, plus hydrothermal deposits include what appears to be vent orifices; note: plume not detected in 2003
Notes Relevant to Biology:
Year and How Discovered (if active, visual confirmation is listed first):
Discovery References (text):
McMurtry et al (1993) Unusual geochemistry of hydrothermal vents on submarine arc volcanoes: Kasuga Seamounts, Northern Mariana Arc. EPSL 114: 517-528.
Other References (text):
Embley, R et al (2004) Explorations of Mariana Arc volcanoes reveal new hydrothermal systems. EOS, Trans. AGU 85(4): 37, 40.