Acta Vulcanologica - Vol.
Plagioclase is the liquidus phase in the three investigated systems, followed by the magnetite.
In alkali-basaltic and hawaiitic products the clinopyroxene joins the magnetite in a short temperature interval, while olivine is not always present. For mugearite rock-type, relationships between composition and run temperature are less obvious since the coefficient of linear correlations between temperature and oxides concentration are generally low in the investigated range. Thus, for alkali-basalt and hawaiite, simple linear relationships are proposed to estimate eruptive temperature on the basis of the MgO, K 2 O and CaO concentration in the liquid phase. Finally, the efficacy of this empirical geothermometer has been tested by comparing the calculated eruptive temperatures with those resulting by field measurements on active lava flows of recent Etnean eruptions.