Micro-XAS STUDY OF OXYGEN FUGACITY IN MELT INCLUSIONS FROM MOUNT AMIATA VOLCANO (ITALY)

Our aim is to obtain information about oxygen fugacity and an oxybarometric estimation of the residual silicate melt in Melt Inclusions (MI), hosted by K-feldspar crystals. This will be achieved through the study of valence and coordination of Ti, Fe and Mn atoms by collecting XAS data at Ti, Fe and Mn K-edges. The type of MI in the samples represents the naturally quenched glass, which denote the pre-eruptive melt conditions, or, from a geochemical point of view, the maximum degree of evolution of the magma reservoir. The obtained information will be coupled with FTIR analyses, to obtain the CO2 + H2O content in the glass (residual silicate melt) and with EPMA-WDS measurements, to compare the distribution of major elements within the geochemical dataset of MI. This set of information will allow the understanding of the oxidative degree of the magma volcanic system and will be contextualized in the wider framework of the evolution of the magmatic system of Mount Amiata volcano.