Chamorro Vent



Latitude: 20.799οN                  Longitude: 144.706οE             Depth: 825 m bsl

Chamorro seamount is an active submarine arc volcano (Baker et al., 2008; Resing et al., 2009) located in 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 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 any biological community.

Table 1: Operations history for Chamorro vent

Ship/ Platform Operation Year Dive number References
TN-153 R/V T. G. Thompson EM 300 multibeam; CTD tow-yo; ORP 2003 February – March Submarine Ring of Fire 2003
EX1605/Deep Discoverer CTD, Scanning sonar 2016 June (Leg 3) 7

Okeanos Explorer 2016 dive summary

 Table 2: Vent activity and host rocks

Activity and Host Rocks References
Activity Active Baker et al., 2008; Resing et al., 2009
Host Rocks Dacite Bloomer et al., 1989

Table 3: Vent fluid characteristics

Vent Fluids References
Composition Small 3He anomaly Resing et al., 2009
Δ3He (fM) 0.16 Resing et al., 2009

* Δ3He – Measured above the background.

Table 4: Vent Biology:

General name Phylum Genus/Species References
Cutthroat eel Chordata Okeanos Explorer 2016
Polychaetes Annelida Okeanos Explorer 2016
Rattails Chordata Okeanos Explorer 2016
Snail Mollusca Alvinoconcha Okeanos Explorer 2016


Video Links:


  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 b. 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 (accessed 01/19/2016)
  2. Okeanos Explorer 2016 (accessed 2/22/2017)

Cruise Reports:

  1. Submarine Ring of Fire 2003 (accessed 01/19/2016)
  2. NOAA Okeanos Explorer 2016 (accessed 2/26/2017)