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Authors: Aiuppa, A.* 
Federico, C.* 
Paonita, A.* 
Pecoraino, G.* 
Valenza, M.* 
Title: S, Cl and F degassing as an indicator of volcanic dynamics: The 2001 eruption of Mount Etna
Issue Date: 2002
Series/Report no.: 11/29(2002)
DOI: 10.1029/2002GL015032
Keywords: magmatic degassing
acidic gases
plume chemistry
Subject Classification01. Atmosphere::01.01. Atmosphere::01.01.07. Volcanic effects 
04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry 
04. Solid Earth::04.08. Volcanology::04.08.01. Gases 
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring 
Abstract: The recent eruption of Mount Etna (July 2001) offered the opportunity to analyze magma-derived volatiles emitted during preand syn-eruptive phases, and to verify whether their composition is affected by changes in volcanic dynamics. This paper presents the results of analyses of F, Cl and S in the volcanic plume collected by filter-packs, and interprets variations in the composition based on contrasting solubility in magmas. A Rayleigh-type degassing mechanism was used to fit the acquired data and to estimate Henryâ s solubility constant ratios in Etnean basalt. This model provided insights into the dynamics of the volcano. Abundances of sulfur and halogens in eruptive plumes may help predict the temporal evolution of an ongoing effusive eruption.
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