Direct observation of immiscibility between carbonate and silicate magmas

Abstract

Carbonate and silicate magmas are found to be immiscible at 3 GPa and 1250 degree C using X-ray radiography at SPring-8. The immiscible characteristics are reserved in a quenched sample in a scale range from micrometer to millimeter. Electron microprobe analyses indicate that carbonate melts are enriched in Ca and Mg than silicate melts.