Abstract
Abundant fluid-melt inclusions are found in the aegirine-augite-barite pegmatite and carbonatite veins in the Mianning REE deposit, Sichuan. They were trapped in early stage fluorite and quartz from a salt-melt system at temperatures higher than 500°C. Meanwhile, fluid inclusions are also present in large amounts in bastnaesite. Homogenized between 150 and 270°C, these inclusions are thought to be representative of the physico-chemical conditions of REE mineralization. These results show that the Mianning REE deposit is of typical hydrothermal origin developed from a salt-melt system.
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