An increase in the mass eruption rate at Mount Etna since 1971 is coupled with a shift in Sr-Nd isotope ratios, enhancing a trend that has characterized the volcano since its earliest stages of activity. After 1971, rapid geochemical variations provide evidence for mixing and mingling of magma batches with different geochemical characteristics in a highly dynamic regime. Magma mixing is evidenced by changes in the Sr isotope composition of the erupted products as well as by isotopic disequilibrium between pyroxene phenocrysts and the whole rocks. The early appearance of clinopyroxene on the liquidus of the magmas combined with thermobarometric...