Effect of degassing on sulfur contents and δ34S values in Somma-Vesuvius magmas

被引：1

作者：

Luigi Marini

Valeria Chiappini

Roberto Cioni

G. Cortecci

E. Dinelli

Claudia Principe

Giorgio Ferrara

机构：

[1] Dipartimento di Scienze della Terra,

[2] Università di Genova,undefined

[3] Corso Europa 26,undefined

[4] I-16132 Genova,undefined

[5] Italy,undefined

[6] Istituto Geocronologia e Geochimica Isotopica,undefined

[7] CNR,undefined

[8] Via C. Maffi 36,undefined

[9] I-56127 Pisa,undefined

[10] Italy Fax: +39 50 83 01 27,undefined

[11] Dipartimento di Scienze della Terra e Geologico-Ambientali,undefined

[12] Università di Bologna,undefined

[13] Piazza di Porta San Donato 1,undefined

[14] I-40126 Bologna,undefined

[15] Italy,undefined

来源：

Bulletin of Volcanology | 1998年 / 60卷

关键词：

Key words Sulfur isotopes; Magma degassing; Somma-Vesuvius volcanic complex;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

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.

引用

页码：187 / 194

页数：7