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Sumisu Rift
Name Alias(es):
Sumizu Rift
MGDS_FeatureID lowest in hierarchy:
Activity:
Latitude:
31.1000
Longitude:
139.8917
Location on map:
Ocean:
Region:
National Jurisdiction:
Maximum or Single Reported Depth (mbsl):
1600
Minimum Depth (mbsl):
1530
Tectonic setting:
Full Spreading Rate (mm/a):
5.5
Host Rock:
BABB, minor rhyolithe
Deposit Type:
LTH, Fe oxide, barite, silica mounds
Notes on Vent Field Description:
nascent back-arc rift; note: spreading rate from primary literature not from Bird (2003); small inactive vent fields with Fe oxide, silica, barite chimneys on a submerged volcano; Taylor et al. (1990): "No focussed outflow regions were discovered either visually or via the thermal gradient measurements."
Notes Relevant to Biology:
Taylor et al. (1990): Fig. 6. (a) "Various crinoids, siliceous sponges and corals cling to the chimneys"; non-vent fauna
Year and How Discovered (if active, visual confirmation is listed first):
1987 submersible Alvin inactive chimneys only
Discovery References (text):
(inactive chimneys only): Urabe & Kusakabe, Earth Planet. Sci. Lett., 100, 283-290, 1990, Barite silica chimneys from the Sumisu Rift, Izu-Bonin Arc: possible analog to hematitic chert associated with Kuroko deposits
Taylor et al. (1990) Alvin-SeaBeam studies of the Sumisu Rift, Izu-Bonin Arc. Earth Planet. Sci. Lett. 100: 127-147.
RDF link: