ISSN:
1432-0819
Keywords:
Key words Sulfur isotopes
;
Magma degassing
;
Somma-Vesuvius volcanic complex
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
Notes:
Abstract Sulfur contents and δ34S values of Somma-Vesuvius magmas are consistent with syneruptive, open-system degassing at temperatures of 800–850°C for Plinian pumices and 1100–1200°C for lavas. The extent of degassing appears to be greater in lavas than in pumices. The key parameter controlling the 34S/32S 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 δ34S 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s004450050226
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