New Inferences on Magma Dynamics in Melilitite‐Carbonatite Volcanoes: The Case Study of Mt. Vulture (Southern Italy)

This study provides the first micro-thermometric data of fluid inclusions (FIs) in mafic loose
(disaggregated) xenocrysts and ultramafic xenoliths in explosive products of the melilitite-carbonatite Mt.
Vulture volcano (southern Italy). Pure CO2 late stage FIs hosted in rock-forming minerals of wehrlite xenoliths
and clinopyroxene xenocrysts were trapped at the local crust-mantle boundary (32 km). In contrast, trapping
pressures within the loose olivine xenocrysts are from 3.2 to 4.5 kbar (8–13 km). Considering the ongoing
degassing of mantle-derived CO2 rich gases, together with seismic evidences of the presence of low amount of
melts at depth, and the tectonic control of the past volcanic activity, our study opens new perspective about the
hazardous nature of the “quiescent” melilitite-carbonatite volcanoes.