Mineralogy and Petrology (2000) 70: 199±220 Experimental study on silicate-melt inclusions in clinopyroxene phenocrysts from Roccamon®na lavas (Italy) A. Lima Dipartimento di Geo®sica e Vulcanologia, Universita Á di Napoli ``Federico II'', Napoli, Italy With 9 Figures Received May 11, 1999; revised version accepted December 14, 1999 Summary Primary silicate-melt inclusions (MI) in phenocrysts from leucite-tephrite, latite, K- basalt, and trachybasalt Roccamon®na lavas have been studied in order to investigate magma crystallization and evolution, and to characterize the composition of parental magmas. The homogenization temperatures (Th) of the clinopyroxene-hosted silicate- melt inclusions range from 1185  5  C to 1275  5  C. Both Th and calculated temperatures from re-heated silicate-melt inclusions (RMI) compositions show that leucite-tephrite clinopyroxenes have a lower cristallization temperatures than latite and K-basalt. Electron microprobe analyses (EMPA) of clinopyroxene, feldspar, biotite, olivine phenocrysts and RMI hosted in clinopyroxenes have been performed. Clinopyroxene compositions generally fall in the diopside-salite ®eld. Plagioclase varies from An 89 to An 43 in latitic lavas and from An 90 to An 85 in trachybasalt lavas, the biotite is F-rich, and the olivine composition ranges from Fo 88-80 to Fo 75-60 in phenocryst cores and rims respectively. The reheated clinopyroxene-hosted silicate-melt inclusion analyses show that they de®ne a less evolved magma composition compared with their corresponding bulk rock composition and that they are comparable with Vulsini silicate-melt inclusions in olivine (Kamenetsky et al., 1995), Vesuvius silicate-melt inclusions in clinopyroxene (Lima et al., 1999) and with the least differentiated Roccamon®na lavas (Giannetti and Ellam, 1994). Silicate-melt inclusion major, minor-element and volatiles variations display three different compositional trends, identi®ed as potassic (KS), high potassic (HKS) and intermediate-K, indicating derivation from different parental melts. Experimental study of RMI indicates that the trapped melts in clinopyroxene from different petrographic types of lavas have different volatile contents. Leucite-tephrite has higher S, F and H 2 O compared with latite and K-basalt.