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Phenocryst/matrix trace-element partition coefficients for hawaiite-trachyte lavas from the Ellittico volcanic sequence (Mt. Etna, Sicily, Italy)

Verteilungs-Koeffizienten von Spurenelementen zwischen Phänokristallen und Matrix in Hawaiit-Trachyt Laven der vulkanischen Abfolge von Ellittico (Ätna, Sizilien, Italien)

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Summary

A set of phenocryst/matrix partition coefficients was obtained for up to 29 trace elements (ICP-MS analyses) in hawaiite to trachyte lavas from the Ellittico volcanic sequence (Mt. Etna system, Sicily). Partition coefficients were determined for plagioclase, clinopyroxene, olivine, kaersutite and Ti-magnetite. These phases, along with apatite (not analysed in this work), constitute the common fractionating solid assemblage of alkaline magmas feeding Mt. Etna volcanic system. The obtained data set forms the first attempt to characterise the solid/melt trace-element partitioning for Etnean magmas, and can be usefully applied in other sites of alkaline volcanism. The partition coefficients are here used to define the scale of incompatibility of 29 trace elements and to asses the extent of differentiation processes and the prevailing oxygen fugacity of Ellittico magmas.

Zusammenfassung

Ein Satz von Phänokristall/Matrix Verteilungs-Koeffizienten für bis zu 29 Spurenelemente wurde mittels ICP-MS Analytik in hawaiitischen bis trachytischen Laven der Ellittico Abfolge (Ätna-System, Sizilien) erhalten. Die Verteilungs-Koeffizienten wurden für Plagioklas, Klinopyroxen, Olivin, Kaersutit und Ti-Magnetit bestimmt. Diese Phasen, zusammen mit Apatit (in dieser Arbeit nicht analysiert), stellen die fraktionierende Assoziation von festen Bestandteilen in alkalischen Magmen, die das vulkanische System des Ätna versorgen, dar. Der Datensatz ist ein erster Versuch die Verteilung von Spurenelementen zwischen Festphasen und Schmelze für Magmen des Ätna zu charakterisieren und kann ebenso nutzbringend auf andere Gebiete mit alkalischem Vulkanismus angewandt werden. Die Verteilungs-Koeffizienten werden hier benützt, um das Ausmaß der Inkompatibilität von 29 Spurenelementen zu erfassen, und das Ausmaß der Differentiationsprozesse und der vorherrschenden SauerstoffFugazität der Ellittico-Magmen zu bestimmen.

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D'Orazio, M., Armienti, P. & Cerretini, S. Phenocryst/matrix trace-element partition coefficients for hawaiite-trachyte lavas from the Ellittico volcanic sequence (Mt. Etna, Sicily, Italy). Mineralogy and Petrology 64, 65–88 (1998). https://doi.org/10.1007/BF01226564

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