Research Article
Rare Earth Elements in Mineral Deposits: Speciation in Hydrothermal Fluids and Partitioning in Calcite
Figure 4
Rare earth element fluid-calcite partitioning Model IIa at 1 kbar, showing the mole fraction of REE in calcite as a function of temperature, salinity (0.5, 5, and 20 wt.% NaCl), and calcite saturation. The starting fluid had a composition of 100 ppm REE, CO2 of 0.1, and 5 to 10 g of calcite.
| (a) 100 ppm REE 0.5 wt.% NaCl 5 g calcite |
| (b) 100 ppm REE 0.5 wt.% NaCl 10 g calcite |
| (c) 100 ppm REE 5 wt.% NaCl 5 g calcite |
| (d) 100 ppm REE 5 wt.% NaCl 10 g calcite |
| (e) 100 ppm REE 20 wt.% NaCl 5 g calcite |
| (f) 100 ppm REE 20 wt.% NaCl 10 g calcite |