Host: Japan Association of Mineralogical Sciences
Recent geochemical studies on melt inclusions proposed that crustal magmas often suffer CO2 fluxing, a process in which a mantle-derived CO2-rich fluid flows through, and interacts with, an H2O-rich shallow-stored magma. However, the mechanisms of CO2-rich fluxing are scarcely understood. In order to explore fundamental properties of CO2 fluxing, we constructed a reactive transport model and examined how the volatile composition in the melt and fluid evolve temporally and spatially. The results allowed us to infer the velocity of the CO2-rich fluid flow. For example, in the case of the Etna's magma, in which CO2 fluxing is expected to have occur, we estimated the fluid velocity to be 10-4 m/s.
