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

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 El littico 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), c onstitute the common fractionating solid assemblage of alkaline magmas feed ing Mt. Etna volcanic system. The obtained data set forms the first attempt to characterise the solid/melt trace-element partitioning for Etnean magma s, and can be usefully applied in other sites of alkaline volcanism. The pa rtition coefficients are here used to define the scale of incompatibility o f 29 trace elements and to asses the extent of differentiation processes an d the prevailing oxygen fugacity of Ellittico magmas.