Latitude: 14.600οN Longitude: 144.775οE Depth: 527 m bsl
NW Rota-1 is an active submarine arc volcano in the rear arc region of the S Seamount Province and shows a steep-sided cone morphology (Chadwick et al., 2008). Volcanic activity was first detected in 2004 (Embley et al., 2006) and repeat visits in 2005 and 2006 confirmed that it was in a continuous state of eruption (Chadwick et al., 2008; Embley et al., 2006). Venting at Brimstone pit was characterized by pulsating plume with droplets of molten sulfur, basaltic ash, lapilli and occasional bombs (>15 cm) falling from the plume after being ejected from the pit (Embley et al., 2006a). Resing et al., (2007) state that this vent discharges sulfuric acid-rich fluids and are also enriched in dissolved and particulate species of metals and gasses such as Fe, Mn and CO2 respectively. The venting began as degassing magma associated with eruption at Brimstone pit. Later visits found venting to be either in the form of CO2 rich gas bubbles or liquid CO2 droplets (Lupton et al., 2008). Some biological communities such as shrimp including two species Alvinocaris sp.M and Opaepele loihi (Stevens et al., 2008) and a type of Proteobacteria called Epsilonproteobacteria (Huber et al., 2010) dominate the NW Rota-1 communities.
Table 1: Operations history for NW Rota 1 vent
Ship/ Platform | Operation | Year | Dive Number | References |
MGLN02MV R/V Melville | SeaBeam 2000 Multibeam | 2006 April- May | J2-186 to J2-189, J2-191, J2-192 | Submarine Ring of Fire, 2006
Woods Hole Oceanographic Institution: ROV JASON/MEDEA: Operations Summary (note: click “Files- operations summary”) |
RR1413 R/V Roger Revelle/ Jason | Multibeam re-survey, CTD | 2014 | J2-800 | Submarine Ring of Fire 2014-Ironman |
NT 0517 R/V Natsushima/ Hyper-dolphin | Not found | 2005 October | HPD#0480 HPD#0481
HPD#0488 HPD#0489 |
NT05-17 cruise report |
NT 10-13 Natsushima Leg.2/ Hyper-dolphin | Not found | 2010 July | HPD#1161 | NT10-13 leg2 cruise report |
TN-232 R/V Thompson/ ROV Jason-2 | Not found | 2009 April | J2-396 to J2-412 | Woods Hole Oceanographic Institution: ROV JASON/MEDEA: Operations Summary (note: click “Files- operations summary”) |
R/V Kilo Moana/ ROV Jason-2 | Not found | 2010 March | J2-487 to J2-495 | Woods Hole Oceanographic Institution: ROV JASON/MEDEA: Operations Summary (note: click “Files- operations summary”) |
TN-167 R/V T. G. Thompson/ ROPOS | CTD tow-yo, CTD vertical cast, EM 300 | 2004 March- April | R782-R784, R786 | Submarine Ring of Fire 2004 |
Table 2: Vent activity and host rocks
Activity and host rocks | References | |
Activity | Active volcano
Continuous state of eruption through 2004-2006 |
Embley et al., 2006; Chadwick et al., 2008; Resing et al., 2009; Dziak et al., 2012 |
Host Rocks | Basalt, basaltic andesite and andesite | Stern et al., 2008 |
Table 3: Vent fluids
Vent Fluids | References | ||
Temperature (οC) | Brimstone pit | 25-120
High T 30-119 |
Lupton et al.,2008
Resing et al., 2009 Embley et al., 2009 |
Iceberg | 53.8 | Huber et al., 2010 | |
Sandy Saddle | 35.6 | Huber et al., 2010 | |
Fault Shrimp | 25.9 | Huber et al., 2010 | |
Scarp Top | 17.6 | Huber et al., 2010 | |
pH | Brimstone pit |
1.64 2.0 |
Huber et al., 2010
Lupton et al.,2008 |
Iceberg | 3.75 | Huber et al., 2010 | |
Sandy Saddle | 2.62 | Huber et al., 2010 | |
Fault Shrimp | 5.25 | Huber et al., 2010 | |
Scarp Top | 5.09 | Huber et al., 2010 | |
ΔpH | -0.730 | Resing et al., 2009 | |
CO2 (mM) | 7.63-93.5 | Lupton et al., 2008 | |
ΔCO2 (mM) | 40 | Resing et al., 2009 | |
H2 (mM) | 0.0001-12.6 | Lupton et al., 2008 | |
Composition |
Focused flow rich in Al, S, Si, CO2, Fe, Mn, and 3He. Diffuse flow rich in Fe, Mn, CO2, and 3He but without Al, S, and Si. |
Resing et al., 2007 | |
Particulate Fe (nmol/kg) | 2052 | Resing et al., 2007 | |
TDMn (nM) | 150 | Resing et al., 2007 | |
TDFe (nM) | 2300 | Resing et al., 2007 | |
Δ3He (fM) | 15.3 | Resing et al., 2007 | |
3He (μM) | 0.0368-38.11 | Lupton et al., 2008 | |
CH4 (mM) | 0.00002-0.0099 | Lupton et al., 2008 |
* ΔpH, ΔCO2 – Measured relative to the regional background; Δ3He – Measured above the background.
Table 4: Vent biology
General name | Phylum | Class/Order | Family | Genus/Species | References |
Bacteria | Proteobactera | Epsilonproteobacteria | Huber et al., 2010 | ||
Shrimp | Arthropoda | Decapoda | Alvinocaridae | Alvinocaris sp.M | Stevens et al., 2008 |
Shrimp | Arthropoda | Decapoda | Alvinocaridae | Opaepele loihi | Stevens et al., 2008 |
Images:
Video Links:
References:
Website References:
Cruise Reports: