The Behavior of Lithium in the Liquidus Area of a High-Fluorine Granite System at Pressures from 100 to 500 MPa

The lithium partitioning between aluminosilicate and alkaline aluminofluoride brine melts in a granite system with the limiting contents of water and fluorine has been studied experimentally at temperatures of 700–800°C and pressures of 100–500 MPa. It is shown that lithium is distributed into the brine melt under all conditions. An increase in the water content in the system by more than 20 wt % and a pressure from 100 to 500 MPa results in decrease in the lithium partition coefficients between brine and aluminosilicate melts by a factor of 2–4.