On the fate of sulfate during hydrothermal circulation at mid-ocean ridges

Details On the fate of sulfate during hydrothermal circulation at mid-ocean ridges On the fate of sulfate during hydrothermal circulation at mid-ocean ridges

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982e%26psl..57..117m&link_type=abstract

Earth and Planetary Science Letters, Volume 57, Issue 1, p. 117-132.

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Reliable sulfate data are reported for seafloor hydrothermal vents at the Galapagos Rift at 86°W and the East Pacific Rise at 21°N. Making use of sulfate-3He systematics, a loss of sulfate comparable to the river input is estimated. It is argued that the dominant chemical mechanism is reduction by iron, a conclusion based on strontium systematics and indicators of the water/rock ratios. Controls on the fate of sulfate in laboratory experiments are examined. It is proposed that the Mg/Ca ratio exerts a significant influence on the rate of sulfate reduction. Mixing of the hydrothermal endmember with seawater is considered. With slow mixing, alkaline earth sulfates should precipitate. Such precipitation accounts for the greater sulfate/heat ratio in the Galapagos fluids which are diluted extensively subsurface. The particular sulfate mineral formed is not known because of questions concerning the control of alkalinity.

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