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Table 4 Analytical results of the solutions before and after the 2, 44 days lasting alteration experiments (200 °C, 260 °C)
|  | Initial solution | Solution after 200 °C experiment | Solution after 260 °C experiment |
|---|---|---|---|
Electr. Cond. (mS cm−1) | 139 | 142 | 140 |
pH (at 25 °C) | 5.52 | 7.22 | 7.38 |
pH (in situ) | 5.52 | 7.45 | 7.79 |
Na | 44,600 | 46,200 | 45,400 |
K | 9.8 | 57 | 30 |
Ca |  < 0.01 | 99 | 315 |
Mg |  < 0.02 | 0.5 | 3.9 |
Fe |  < 0.0004 | 0.056 | 0.989 |
Al |  < 0.0004 | 0.127 | 0.042 |
Si | – | 39 | 77 |
Li | 0.078 | 0.062 | 0.081 |
Rb | 0.025 | 0.041 | 0.124 |
Cs | 0.0014 | 0.072 | 0.022 |
Sr |  < 0.00002 | 0.493 | 1.051 |
Ba | 0.0029 | 8.736 | 18.350 |
Cl | 66,500 | 68,800 | 68,000 |
HCO3 | – | 268 | 873 |