Abstract
Published data of He solubility in silicate melts of simple composition enable the calculation of He solubility of any melt of natural composition with a fair accuracy. The model proposed relates Henry's law solubility constant K to the mole fraction of oxide component in the melt according to: ln K= ∑ i X ik i where k i is a constant, to be determined and X i the oxide mole fraction of component i. k i -values are obtained, for SiO 2, Al 2O 3, K 2O, CaO, Na 2O, Li 2O and MgO, and increase in that order. These k i -values and reasonable assumptions (concerning TiO 2, FeO and Fe 2O 3) make it possible to calculate a model He solubility for a tholeiitic basalt melt which compares fairly well with the previously published result.
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