Istituto di Geoscienze e Georisorse     
Marini L., Chiappini V., Cioni R., Cortecci G., Dinelli E., Principe C., Ferrara G. Effect of degassing on sulfur contents and δ⁴S values in Somma-Vesuvius magmas. In: Bulletin of Volcanology, vol. 60 (3) pp. 187 - 194. Springer, 1998.
Sulfur contents and δ⁴S values of Somma-Vesuvius magmas are consistent with syneruptive, open-system degassing at temperatures of 800850C for Plinian pumices and 11001200C for lavas. The extent of degassing appears to be greater in lavas than in pumices. The key parameter controlling the ⁴S/S ratio of Somma-Vesuvius volcanics is the average magma oxidation state, which generally varies from 0.85 to 1.20 Δ NNO units for lavas and from 1.20 to 1.40 Δ NNO units for pumices. Consequently, S contents and δ⁴S values of magmas constitute a potentially valuable tool in estimating their average redox conditions. The results of this study may help in risk mitigation when the Vesuvius magmatic system evolves toward eruptive conditions.
URL: http://www.springerlink.com/content/2fjb1l10w6eh4ctp/?p=76e6da5d0c9c46afb004960a267a6bf5&pi=3
DOI: 10.1007/s004450050226
Subject sulfur isotopes
magma degassing
Somma-Vesuvius volcanic complex

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