Sulfur isotope systematics at the 21°N site, East Pacific Rise

Details Sulfur isotope systematics at the 21°N site, East Pacific Rise Sulfur isotope systematics at the 21°N site, East Pacific Rise

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..66...91k&link_type=abstract

Earth and Planetary Science Letters, Volume 66, p. 91-100.

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16

Scientific paper

Hydrogen sulfide in hydrothermal vent fluid at the 21°N site is enriched in 34S relative to Mid-Ocean Ridge basalts, probably by addition of H2S reduced from seawater sulfate by FeO-bearing basalt. Metalliferous sulfides are depleted in 34S relative to the fluid from which they apparently precipitated, the degree of depletion reflecting the microenvironment in which each mineral crystallised and/or kinetic effects. Isotopic compositions of coexisting sulfides in a basal mound are consistent with equilibration at around 445°C, though heating to such a high temperature seems unlikely. Similar sulfides in a black smoker and in a dead chimney are out of isotopic equilibrium at any temperature, apparently reflecting a complex series of replacement mineralisations and post-depositional oxidation, respectively.

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