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Extensional Relay Zone A
Name Alias(es):
ERZA
North Fiji Fracture Zone
North Fiji spreading center
MGDS_FeatureID lowest in hierarchy:
Vent Sites:
Central Hill
Seahorse
Activity:
Latitude:
-16.1667
Longitude:
177.4167
Location on map:
Ocean:
Region:
National Jurisdiction:
Maximum or Single Reported Depth (mbsl):
2335
Minimum Depth (mbsl):
1860
Tectonic setting:
Full Spreading Rate (mm/a):
68.8
Host Rock:
NotProvided
Deposit Type:
VSD, disseminated sulfides
Notes on Vent Field Description:
local occurrences of disseminated sulfides impregnating basaltic lavas along spreading center; de Ronde et al. (2003) plotted as hydrothermal field just north of Fiji; Arculus (2012) describes a site "Seahorse" (Fiji Target 2, adjacent to Ridge 4) south of the previously reported "Central Hill"
Notes Relevant to Biology:
Kojima (1999): "... huge quantities of shell fragments, which are considered to have belonged to a hydrothermal vent community, are accumulated in an area of 0.5 km2."
Year and How Discovered (if active, visual confirmation is listed first):
1999 towed camera did not confirm activity
Discovery References (text):
[Von Stackelberg et al., Geologisches Jahrbuch, Reihe D, 92, 7-36 & 547 613, 1990]
(seafloor observations with towed camera did not confirm active) Kojima (1999) PRELIMINARY REPORT ON THE RESULTS OF THE JAPAN/SOPAC DEEPSEA MINERAL RESOURCES SURVEY IN THE REPUBLIC OF THE FIJI ISLANDS WATERS. SOPAC Preliminary Report 117.
Other References (text):
de Ronde et al. (2003) Hydrothermal fluids associated with seafloor mineralization at two southern Kermadec arc volcanoes, offshore New Zealand. Mineralium Deposita 38: 217–233, DOI 10.1007/s00126-002-0305-4.
Arculus, R. (2012) Voyage Summary SS02/2012, Northern Lau Transit Expedition (NoLauTE). Available at: http://www.cmar.csiro.au/datacentre/process/data_files/cruise_docs/ss2012_v02_summary.pdf, accessed June 2015.
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