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A correct description and quantification of the geochemical behaviour ofREE+Y (rare earth elements and Y) and HFSE (high field strength elements) is akey requirement for modelling petrological and volcanological aspects of magmadynamics. In this context, mafic alkaline magmas (MAM) are characterized by theubiquitous stability of clinopyroxene from mantle depths to shallow crustallevels. On one hand, clinopyroxene incorporates REE+Y/HFSE at concentrationlevels that are much higher than those measured for olivine, plagioclase, andmagnetite. On the other hand, the composition of clinopyroxene is highlysensitive to variations in pressure, temperature, and melt-water content,according to exchange-equilibria between jadeite and melt, and betweenjadeite/Ca-Tschermak and diopside-hedenbergite. As a consequence, thedependence of the partition coefficient on the physicochemical state of thesystem results in a variety of DREE+Y/DHFSE values that are sensitive to themagmatic conditions at which clinopyroxenes nucleate and grow. In order tobetter explore magma dynamics using clinopyroxene, a new P-T-H2O-lattice strainmodel specific to MAM compositions has been developed. The model combines a setof refined clinopyroxene-based barometric, thermometric and hygrometricequations with thermodynamically-derived expressions for the three latticestrain parameters, i.e., the strain-free partition coefficient (D0), the siteradius (r0), and the effective elastic modulus (E).

An integrated P-T-H2O-lattice strain model to quantify the role of  clinopyroxene fractionation on REE+Y/HFSE patterns of mafic alkaline magmas:  Application to eruptions at Mt. Etna