Chemistry of hydrothermal solutions from the southern Juan de Fuca Ridge
摘要:
Fluids from three vent fields on the southern Juan de Fuca Ridge were sampled in September 1984 using the DSRV Alvin. The fluids are uniquely high in both chloride, which ranges up to twice the seawater value, and in metal content. Simple vapor-liquid phase separation could not have produced both the high chlorinity and gas concentrations observed in these fluids. The cause of the elevated chlorinity can not be uniquely identified but may be the result of either or a combination of two processes: (1) subsurface formation of a degassed brine and subsequent mixing of a small amount of this brine with a hydrothermal seawater which has not undergone a phase separation and (2) dissolution of a chloride-rich phase combined with a possible small loss of gas during sampling procedures. Although measured temperatures were all less than 300°C, quartz geothermometry suggests that the fluids have equilibrated at greater than 340°C. Quartz geobarometry is also in agreement with geophysical estimates of depth to the local magma chamber.
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关键词:
Experimental/ geochemistry geology oceanography/ midocean ridge chemical composition chemistry Pacific seawater ocean geochemistry salinity hydrothermal vent seafloor geology AD 1984 09 hydrothermal solutions Juan de Fuca Ridge brine NaCl/ A9150E Seafloor processes A9210M Thermohaline structure and circulation of the oceans A9220C Chemistry of the oceans A9330P Pacific Ocean/ NaCl/bin Cl /bin Na/bin
DOI:
10.1029/JB092iB11p11334
被引量:
年份:
1987
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