SW Syoyo Vent

Latitude: 22.395^oN                 Longitude: 142.755^oE             Depth: 1450 m bsl

Southwest Syoyo hydrothermal vent is located in a caldera in an active Mariana submarine volcano (Baker et al., 2008).  SW 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 also 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 SW Syoyo vent

Table 2: Vent activity and host rocks

Table 3: Plume Characteristics

* ΔpH – Measured relative to the regional background; Δ³He – Measured above the background.

Vent Biology: None known

Images: None known

Video Links: None known

References:

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:

4. Submarine Ring of Fire 2003 http://oceanexplorer.noaa.gov/explorations/03fire/logs/summary/marianas_cruisereport.pdf (accessed 02/16/2015)