Fractionation of sulphur isotopes in volcanic gases

Details Fractionation of sulphur isotopes in volcanic gases Fractionation of sulphur isotopes in volcanic gases

Nov 1958

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1958gecoa..15...32s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 15, Issue 1-2, pp.32-39

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4

Scientific paper

The 34 S / 32 S -ratios in several samples of SO 2 and H 2 S from the fumaroles of Volcano Showashinzan, Japan, were measured. The outlet temperature of the fumaroles from which the samples were collected ranged from 100 to 661 °C. It was observed that the lower the outlet temperature of the fumarole, the higher the content of the heavy isotope in the SO 2 . The isotopic ratio of H 2 S was found, on the other hand, to be almost constant throughout the range of temperature given above. This isotopic fractionation between SO 2 and H 2 S was ascribed to the reaction: H 2 S + 2 H 2 O SO 2 + 3 H 2 The temperatures estimated from the observed fractionation factors and the theoretical ones were in fairly good agreement with the observed outlet temperatures. The isotopic ratio of both compounds can be reasonably explained by a simplified system containing only H 2 S, H 2 O, SO 2 and H 2 . But, some difficulty arises when the chemical compositions of the actual fumaroles are taken into consideration.

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