Computer Science
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..76..185l&link_type=abstract
Earth and Planetary Science Letters, Volume 76, Issue 1-2, p. 185-192.
Computer Science
27
Scientific paper
210Pb, 210Bi and 210Po, the last decay products of the 238U series, are highly enriched in volcanic plumes, relative to the magma composition. Moreover this enrichment varies over time and from volcano to volcano. A model is proposed to describe 8 years of measurements of Mt. Etna gaseous emissions. The lead and bismuth coefficients of partition between gaseous and condensed phases in the magma are determined by comparing their concentrations in lava flows and condensated volatiles. In the case of volatile radionuclides, an escaping time is calculated which appears to be related to the volcanic activity. Finally, it is shown that that magma which is degassing can already be partly degassed; it should be considered as a mixture of a few to 50% of deep non-degassed magma with a well degassed superficial magma cell.
Ardouin B.
Lambert Gaultier
Le Cloarec Marie-Fancoise
Le Roulley J.-C.
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