Other
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.109...37p&link_type=abstract
Earth and Planetary Science Letters, Volume 109, Issue 1-2, p. 37-46.
Other
7
Scientific paper
Strontium and calcium are transported as chloride complexes in submarine hydrothermal vent waters with the Sr and Ca concentrations being controlled by equilibration with secondary mineral phases (mainly epidote and anorthite-albite). The relative proportions of albite and anorthite precipitated from hydrothermal fluids are also dependent on the Cl level of the fluids due to sodium metasomatism of the oceanic crust. The S/Ca ratio of albite is higher than coexisting anorthite, hence the Sr/Ca ratios of the vent waters are also a function Cl concentrations. The Sr isotope composition of hydrothermal fluids is determined by the mixture of seawater Sr passing through the anhydrite precipitation zone and Sr leached from basalt. The proportion and absolute amount of seawater Sr in the hydrothermal waters can be calculated from the 87Sr/86Sr ratio of seawater, local basalt and the vent fluids themselves, and is also dependent on the Cl concentrations of the fluids. These two observations have been used to examine the factors controlling chloride concentration of submarine hydrothermal fluids. The data support precipitation of a Cl-rich mineral phase and hydration of oceanic crust as the major processes controlling Cl concentrations in intermediate-Cl vents, such as those at 21°N (East Pacific Rise) and the TAG and MARK sites (Mid-Atlantic Ridge). The Cl levels of vent fields with extreme-Cl concentrations (Juan de Fuca and 11-13°N EPR) appear to be controlled by supercritical brine condensation followed by mixing of the brine and vapor phases.
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