Abstract
Measurements of the radioactivity of gases released by White Island volcano show variations in 210Po-concentrations with temperature in fumarolic gases, and this is interpreted to be due to dilution of magmatic gases with vapours derived from an envelope of acid brines surrounding the vent system. The degassing model derived for Mount Etna emissions is tested on White Island magmatic gases. The results are a short degassing time (2 days), small degassing magma volume ( 5 × 10 6m 3 ), and the following estimations of emanation coefficients: Pb= 1% , Bi= 2.7% , Cd= 0.05% and Cu= 0.07/%. The initial content of S in the magma is estimated to be within the range 300–600 mg/kg. Fluxes of trace metals (kg/day) emitted by the volcano are estimated to be Pb= 125 , Bi= 6 , Cu= 300 and Cd= 9 .
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