Citation
P. Jeanbaptiste et al., HELIUM AND OXYGEN ISOTYPE ANALYSES OF HYDROTHERMAL FLUIDS FROM THE EAST PACIFIC RISE BETWEEN 17-DEGREES-S AND 19-DEGREES-S, Geo-marine letters, 17(3), 1997, pp. 213-219
Citations number
26
Categorie Soggetti
Geosciences, Interdisciplinary",Oceanografhy
Journal title
Geo-marine letters
ISSN journal
02760460
→ ACNP
Volume
17
Issue
3
Year of publication
1997
Pages
213 - 219
Database
ISI
SICI code
0276-0460(1997)17:3<213:HAOIAO>2.0.ZU;2-M
Abstract
Hydrothermal vent fields south of the Garret Fracture zone were sample
d for the isotope composition of helium and oxygen ([O-18]H2O/[(OH2O)-
O-16). The helium isotopes end-member (He-3/He-4 = 8.3 x R-a and [He-4
] approximate to 1.2-2.4 x 10(-5) cm(3) STP g(-1)) is quite similar to
other known hydrothermal sites pointing to the homogeneous helium com
position of the upper mantle. The delta(18)O end-member value (delta(1
8)O approximate to 0.5-0.6 parts per thousand) confirms previous sugge
stions from other sites and from isotope modeling, that hydrothermal f
luids are slightly enriched in O-18 relative to the ocean as a result
of water-rock interactions at high temperature.