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TOTO Caldera

Name Alias(es): 
Nakayama Field
Toto Caldera
MGDS_FeatureID lowest in hierarchy: 
Vent Sites: 
TOTO (= Toto)
Maximum Temperature: 
Location on map: 
Maximum or Single Reported Depth (mbsl): 
Tectonic setting: 
Volcano Number (if applicable): 
Host Rock: 
Deposit Type: 
Notes on Vent Field Description: 
located at Patgon-Masala Seamount, southern Mariana Arc; Harue et al. (2001) and Gamo et al. (2004) suggest this is arc-volcano type not back-arc type like Alice Springs; seamount is 5 miles SE of spreading axis; caldera elliptical with major axis 7 miles; caldera rim at 2300m depth; hydrothermal field at NE crater of caldera
Notes Relevant to Biology: 
tubeworms, shrimp, galatheid crabs, small bivalves and gastropods (but did not observe large hairy gastropods)
Year and How Discovered (if active, visual confirmation is listed first): 
2000 deep-tow camera (later, same year - ROV Kaiko); 1998 or earlier hydrothermal deposits dredged; 1998 plume only
Discovery References (text): 
Mitsuzawa et al. (2000) Preliminary report of Deep-Tow/Yokosuka Cruise at hydrothermal areas in the Mid and Southern Mariana. JAMSTEC Journal of Deep Sea Research 17: 73-87 (in Japanese with English abstract)
Masuda, H et al (2001) Bathymetry and hydrothermal activities in the southern Mariana Trough. Reconnaissance results of YK-99-11. JAMSTEC Journal of Deep Sea Research 18: 83-88 (in Japanese with English abstract)
Gamo, T et al (2004) Discovery of a new hydrothermal venting site in the southernmost Mariana Arc: Al-rich hydrothermal plumes and white smoker activity associated with biogenic methane. Geochem Journal 38: 527-534.
Other References (text): 
[Hein et al., in Geology and Resource Potential of the Continental Margin of Western North America and Adjacent Ocean Basins, 753-771, 1987]
Fryer et al. (2009) Patgon-Masala Seamount, Southern Mariana Arc: Recent Observations with the WHOI Nereus HROV. AGU Fall Meeting ID# V44B-08.