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
AbstractHelium 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.
- T. Torgersen, J. E. Lupton, D. S. Sheppard and W. F. Giggenbach
- Published Journal
- Journal of Volcanology and Geothermal Research, 1982
- Not Provided
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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. (!) .