Lead isotopes behavior in the fumarolic environment of the Piton de la Fournaise volcano (Reunion Island) | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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  Lead isotopes behavior in the fumarolic environment of the Piton de la Fournaise volcano (Reunion Island)

Type de publication:

Journal Article

Source:

Geochimica Et Cosmochimica Acta, Volume 100, p.297-314 (2013)

ISBN:

0016-7037

Mots-clés:

UMR 7154 ; Géologie des systèmes volcanologiques

Résumé:

The recent activity of the Piton de la Fournaise volcano offers a rare opportunity to address the issue of Pb isotope behavior in volcanic fumaroles, as the composition of the degassing source is accurately and precisely known. Gas sublimates formed between 2007 and 2011 at temperature ranging from 400 to ca. 100 °C include Na–K sulfate (aphthitalite), Ca–Cu sulfate (e.g., gypsum), Na sulfate (thenardite), Ca–Mg–Al–Fe fluoride (e.g., ralstonite) and native sulfur. The high-temperature deposits show trace element patterns typical of volcanic gas (with Pb concentration up to 836 ppm) while the low-temperature deposits are depleted in most volatile elements (Pb <1 ppm) with the exception of Pd and Tl (in fluorides) and Se (in native sulfur).