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Geology; September 1994; v. 22; no. 9; p. 823-826; DOI: 10.1130/0091-7613(1994)022<0823:HIATOT>2.3.CO;2
© 1994 Geological Society of America
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Helium isotopes as tracers of trapped hydrothermal fluids in ocean-floor sulfides

F. M. Stuart1, G. Turner1, R. C. Duckworth2 and A. E. Fallick3

1 Department of Geology, Manchester University, Manchester M13 9PL, United Kingdom
2 Department of Geology, University of Wales, Cardiff CF1 3YE, United Kingdom
3 Isotope Geoscience Unit, Scottish Universities Research and Reactor Centre, East Kilbride G75 0QU, United Kingdom

Helium isotopes have been measured in fluids trapped in minerals from three mid-ocean ridge hydrothermal systems at bare-rock sites and at the sediment-covered site at Middle Valley, northern Juan de Fuca Ridge. Fluid-inclusion 3He/4He ratios from the bare-rock sites are indistinguishable from those of the vent fluids and are close to the local basalt values. Values for {delta}34S of the host sulfide are consistent with variable contributions of seawater sulfate S to the basalt-derived S in the hydrothermal fluids. This does not affect inclusion-hosted 3He/4He because of the high He concentration of the hydrothermal fluids relative to seawater. Fluid-inclusion 3He/4He ratios from Middle Valley are a mixture of basalt-derived He and radiogenic He acquired from pore fluids in the overlying Pleistocene turbidite sediments after seawater-basalt interaction. The radiogenic He accompanies isotopicalty heavy S, demonstrating that He isotopes may be used to distinguish pore fluids from seawater in hydrothermal systems.




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