Understanding Sources and Modification of Primary Magmatic Volatiles in the Taupo Volcanic Zone: Evidence from Helium and Oxygen Isotopes
David FarskyMichael RoweIsabelle ChambefortD. W. GrahamShane M. RooyakkersKevin FaureSimon J. Barker
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The isotope effect in the solution of helium in water from 0 degrees to 40 degrees C has been determined by microgasometric measurements of the solubilities of pure helium-3 and helium4. At 0 degrees C helium-3 is less soluble than helium-4 in both distilled water and sea-water by 1.2 percent. The observed fractionation factor is 0.988+/-0.002 at 0 degrees C and appears to decrease with increasing temperature at the rate of 0.0001 per degree Centigrade, although the existence of this trend is of limited statistical certainty. The measured isotope effect is in agreement with the ratio of helium-3 to helium-4 in surface ocean water reported by Clarke, Beg, and Craig.
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