Density of carbonatite melts under pressure and the mobility of carbon in the upper mantle

Here we aim at measuring the density of hydrous carbonatite melts (> 40 wt% CO2, < 15 wt% SiO2, < 10 wt% H2O) that are representative of carbon-rich melts
produced by the partial melting of carbonated mantle rocks between 50 and 200 km depth. These melts play a key role in the geochemical and geodynamical
evolution of the mantle, in the transport of carbon to the surface and in the regulation of the deep carbon cycle. Density will be measured between 1-5 GPa and
1300-2000 K in a panoramic Paris-Edinburgh (PE) press by the X-ray absorption technique at ID27 beamline. The results will provide insights into the mobility of
carbonated melts at depth and their role as carbon reservoirs and carriers in the Earth’s interior.