Helium Isotope Variations In The Thermal Areas Of New Zealand

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Journal Article: Helium Isotope Variations In The Thermal Areas Of New Zealand

Abstract
Helium isotope ratios measured in the thermal areas of New Zealand range from R/RA = 5-8 (R = 3He/4He; RA = Rair), in general agreement with earlier work on subduction zones. At Wairakei values up to R/RA ≅ 8.2 were measured, which overlap with the range for typical mid-ocean ridge basalts (R/RA ≅ 8-10). The large 3He/4He variations observed throughout the Taupo Volcanic Zone and also within the Wairakei Geothermal Field are not correlated with gas chemistry, water chemistry, etc. However, 3He/4He ratios do correlate with absolute He concentration and with 40Ar/36Ar ratios, suggesting that the observed 3He/4He variations are due to mixing between a 3He-rich mantle end-member and a radiogenic component added either at depth or near the surface.

Authors 
T. Torgersen, J. E. Lupton, D. S. Sheppard and W. F. Giggenbach








Published Journal 
Journal of Volcanology and Geothermal Research, 1982





DOI 
Not Provided
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Citation

T. Torgersen,J. E. Lupton,D. S. Sheppard,W. F. Giggenbach. 1982. Helium Isotope Variations In The Thermal Areas Of New Zealand. Journal of Volcanology and Geothermal Research. (!) .