Helium isotopes in Icelandic geothermal systems: II. Helium-heat relationships

Details Helium isotopes in Icelandic geothermal systems: II. Helium-heat relationships Helium isotopes in Icelandic geothermal systems: II. Helium-heat relationships

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.4229p&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 56, Issue 12, pp.4229-4235

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Scientific paper

A model has been developed that relates the 3 He content of the reservoir fluid to the fluid enthalpy. In contrast to oceanic hydrothermal systems that display a uniform 3 He/enthalpy ratio (0.4-14 × 10 6 atoms of 3 HE/joule), Icelandic systems vary by ~ 1000 (0.4-400 × 10 6 atoms/joule). A process that preferentially extracts helium relative to heat from a cooling magma produces high 3 He/enthalpy ratios for young systems (e.g., Krafla) and low 3 He/enthalpy ratios for aging magmatic systems (e.g., Hveragaerdi). Using the highest 3 He / heat ratios measured in the fluid, estimates of initial gas concentrations in the basalt are made for 3 He (5 × 10 -10 cc/g) and carbon (1200 ppm). Low temperature wells near Geysir in southwest Iceland appear to result from mixing of high temperature fluid (>200°C) and cold groundwater along a curve of constant 3 He/enthalpy.

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