Abstract
Crystal-rich lithic clasts occurring in volcanic deposits are key tools to understand processes of storage, cooling, and fractionation of magmas in pre-eruptive volcanic systems. These clasts represent snapshots of the magma-chamber^host-rock interface before eruption and provide information on crystallization, differentiation, and degrees of interaction between magma and wall-rock. In this study we have focused on the petrology of clasts of cumulate and skarn rocks from the Colli Albani Volcanic District with the aim of shedding light on magma^carbonate interaction and CO2 emission in volcanic areas. By means of phase relations, bulk-rock chemistry, mineral compositions and isotope data we have identified different types of cumulates and skarns. Cumulates containing either clinopyrox)
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