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Helium and oxygen isotope analyses of hydrothermal fluids from the East Pacific Rise between 17°S and 19°S

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Abstract

 Hydrothermal vent fields south of the Garret Fracture zone were sampled for the isotope composition of helium and oxygen ([18O]H2O/[16OH2O). The helium isotopes end-member (3He / 4He=8.3×R a and [4He]≈1.2–2.4×10-5 cm3 STP g-1) is quite similar to other known hydrothermal sites pointing to the homogeneous helium composition of the upper mantle. The δ18O end-member value (δ18O≈0.5–0.6‰) confirms previous suggestions from other sites and from isotope modeling, that hydrothermal fluids are slightly enriched in 18O relative to the ocean as a result of water–rock interactions at high temperature.

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Authors and Affiliations

  1. DSM/LMCE, CEA-Saclay, F-91191 Gif-sur-Yvette cedex, France, , , , , , FR

    P. Jean-Baptiste, A. Dapoigny & M. Stievenard

  2. DRO/GM, IFREMER, BP. 70, F-29180 Plouzané Cedex, France, , , , , , FR

    J. L. Charlou, Y. Fouquet, J. P. Donval & J. M. Auzende

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  1. P. Jean-Baptiste
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  2. A. Dapoigny
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  3. M. Stievenard
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  4. J. L. Charlou
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  5. Y. Fouquet
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  6. J. P. Donval
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  7. J. M. Auzende
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Received: 11 December 1995/Revision received: 20 December 1996

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Jean-Baptiste, P., Dapoigny, A., Stievenard, M. et al. Helium and oxygen isotope analyses of hydrothermal fluids from the East Pacific Rise between 17°S and 19°S. Geo-Marine Letters 17, 213–219 (1997). https://doi.org/10.1007/s003670050029

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  • DOI: https://doi.org/10.1007/s003670050029

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