Other
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002gecoa..66.1409k&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 66, Issue 8, pp.1409-1427
Other
Scientific paper
Low-temperature (<13°C) diffuse hydrothermal fluids were sampled directly at the seafloor with a specially designed Hydro Bottom Station in the North Fiji Basin and analyzed for gases, major and minor elements, and a large number of trace metals. The fluids were significantly enriched in CO 2 , Si, Li, Rb, Cs, Ba, Mn, and several trace metals compared to ambient seawater, had high CH 4 and H 2 S concentrations, and had a slightly decreased salinity. Calculated end-member concentrations of the low-temperature fluids show a strong similarity to the neighboring hot vents, implying that the diffuse fluids are hot vent waters diluted by seawater. According to the chemical composition, the sampled fluids derive from vapor-phase fluids produced by subseafloor boiling and phase separation. Compared to hot vents from other regions, Mn, Fe, and other trace metal concentrations are low. Subsurface metal sulfide precipitation during cooling and dilution with seawater has further decreased the dissolved metal contents of the diffuse fluids, thus creating a very favorable environment for the hydrothermal fauna, as indicated by a very low Fe/H 2 S ratio. Therefore, the fluids support high bioproductivity but no hydrothermal mineral precipitation. The emanation of the condensed vapor phase appears to have been stable during the past 10 years; however, the occurrence of metal sulfide particles in some fluid and sediment samples and small areas of dead fauna indicate that the hydrothermal system may be evolving toward the emanation of the stored brine phase.
Bau Michael
Brasse Sabine
de Carvalho Leandro M.
Fonseca Nuno M.
Halbach Peter
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