Other
Scientific paper
Apr 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3808613w&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 8, CiteID L08613
Other
Geochemistry: Hydrothermal Systems (0450, 3017, 3616, 4832, 8135, 8424), Geochemistry: Geochemical Cycles (0330), Geochemistry: Major And Trace Element Geochemistry, Geochemistry: Marine Geochemistry (4835, 4845, 4850), Geochemistry: Reactions And Phase Equilibria (3612, 8412)
Scientific paper
Three types of hydrothermal vent fluids, herein referred to as cave, submarine-brine and seawater-like, were recovered from a shallow submerged system at Milos in the Aegean Sea, Greece, for detailed chemical and isotopic analyses. The cave fluids discharge through rock fissures near sea-level and have low pH, chlorinity, and B concentrations relative to seawater. The submarine-brine fluids are characterized by high Cl and contain >10 times seawater B concentrations. A scenario involving a two-cells circulation is proposed; one occurs at 1-2 km and another at shallower depth. The deeper saline reservoir has experienced subcritical phase separation, partitioning 0.42 mM B in vapor and 6.8 mM in brine with no detectable isotopic fractionation. The reaction temperature in the saline reservoir is 313°C calculated from the Na-K-Ca geothermometry. The vapors rise directly to form the cave vents, whereas the saline fluids transport in different pathways and are influenced by seawater mixing to form the variable submarine-brine fluids. The seawater-like fluids circulate at shallower depths, where calculated temperature is 248°C and show slightly diluted B (0.36-0.41 mM) and seawater δ11B. These fluids probably resulted from heating of down-flow seawater and may have experienced groundwater discharge and partial Mg removal. This study represents the first two-cells circulation occurring at Milos and emphasizes the important role of phase separation in shallow submarine hydrothermal system.
Baltatzis Emmanuel
Valsami-Jones Eugenia
Wang Bo-Shian
Wu Shein-Fu
You Chen-Feng
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