W Syoyo



Latitude: 22.509οN     Longitude: 142.533οE     Summit: 1750 m bsl

West Syoyo hydrothermal vent is located in a caldera in an active Mariana submarine volcano (Baker et al., 2008).  W. Syoyo volcano lies in the rear arc of the Northern Seamount Province (Bloomer et al., 1989). No vent has been found but Resing et al. (2009, Table 4) report evidence of low levels of hydrothermal activity based on Light Scatter and Oxidation Reduction Potential (ORP) measurements using CTD rosette package. The plume is seen in elevated Mn and 3He, for discrete water samples collected above the volcano (Resing et al., 2009). Because the vent has not yet been found, there is no information about biological community.

Table 1: Operations history for W Syoyo vent

Ship/ Platform Operation Year References
TN-153   R/V T. G. Thompson EM 300 multibeam; CTD tow-yo; ORP 2003 February – March Submarine Ring of Fire 2003

Table 2: Vent activity and host rocks

Activity and Host Rocks References
Activity Active Baker et al., 2008; Resing et al., 2009
Host Rocks Mafic/Intermediate volcanic Bloomer et al., 1989

Table 3: Plume Characteristics

Plume Anomalies References
Composition Small Mn and 3He Resing et al., 2009
Particulate Fe (nmol/kg) 3.6 Resing et al., 2009
TDMn (nM) 0.9 Resing et al., 2009
Δ3He (fM) 2.8 Resing et al., 2009

* Δ3He – Measured above the background.

Vent Biology: None known

Images: None known

Video Links: None known


  1. Baker, E. T., Embley, R. W., Walker, S. L., Resing, J. A., Lupton, J. E., Nakamura, K., de Ronde, C. E. J., Massoth, G. J., 2008. Hydrothermal activity and volcano distribution along the Mariana arc: Journal of Geophysical Research 113 (B8), 1-16.
  2. Bloomer, S. H., Stern, R. J., Fisk, E., Geschwind, C. H., 1989. Shoshonitic Volcanism in the Northern Mariana Arc. 1. Mineralogic and Major and Trace Element Characteristics. Journal of Geophysical Research 94 (B4), 4469-4496.
  3. Resing, J. A., Baker, E. T., Lupton, J. E., Walker, S. L., Butterfield, D. A., Massoth, G. J., Nakamura, K., 2009. Chemistry of hydrothermal plumes above submarine volcanoes of the Mariana Arc. Geochemistry, Geophysics, Geosystems 10 (2), 1-23.

Website References:

  1. Submarine Ring of Fire 2003 cruise report (accessed 03/02/2015)