Salt-containing systems

Fig. 4-1: P-T projection of NaCl – H2O system with inset of relations at 20 wt.%NaCl

Fig. 4-3: Behaviour of fluid inclusion with 10 wt. %NaCl on freezing Fig. 4-3: Behaviour of fluid inclusion with 10 wt.%NaCl on freezing. Starting from 25ºC, then freezing to -46º and slowly heating. First melting Te is at -21.2º, which is the eutectic temperature for NaCl-H2O. Final melting Tm is at -7º, which is a function of the NaCl concentration.

Fig. 4-4: Low temperature portion of the NaCl-H2O.

Fig. 4-6: Three different modes of homogenization of halite-bearing inclusions, each with 40 wt.% NaCl.

Fig. 4-7: P-T diagram illustrating the modes of homogenization from the previous slide. In A, the halite dissolves at 323º, and it homogenizes to liquid at 500º. In B, homogenization to liquid and halite dissolution is at 323º. In C, homogenization to liquid is at 200º and halite dissolves at ~300º.

Fig. 4-12: P-X diagram for H2O-NaCl at 700°C Fig. 4-12: P-X diagram for H2O-NaCl at 700°C. Any composition below the 700°C solvus is a two-phase field of NaCl-rich liquid + low NaCl vapour. The line at 20 wt% NaCl shows the behaviour at 1kbar.

Fig. 4-15: Fluid inclusion containing halite (H) and sylvite (S) daughter minerals.

Fig. 4-16:

Fig. 4-17: Heating relationships in H2O-NaCl-CaCl2

Fig. 4-18: Freezing relationships in : H2O-NaCl-CaCl2