Table 2.
Experimental conditions.
| Experiment | QC13 | QC14 |
|---|---|---|
| Temperature (°C) | 350 | 350 |
| Maximum applied confining pressure, Pc (MPa) | 27.5 | 45.0 |
| Maximum vapour pressure, Pf-max (MPa) | 15.5 | 17.0 |
| Maximum effective pressure, Pe-max (MPa) 1 | 15.0 | 28.0 |
| Experiment duration (days) | 62 | 61 |
| Initial sample volume (mm3) | 5937.6 | 124.5 |
| Volume of polished crystal(s) plus sand (mm3) | 3207.5 | 82.8 |
| Initial pore volume (mm3) 2 | 2730.1 | 41.7 |
| Initial porosity (%) 3 | 46.0 | 33.5 |
| Initial pore fluid composition | 1000 ppm SiO2 (aq) | d.d. H2O SiO2 (aq) |
| Liquid volume added at 20 °C (mm3) | All pores filled with brine | 10.5 |
1Calculated from vapour pressure data21, assuming liquid plus vapour present in the capsule. Pressure of included air is assumed negligible.
2Inner volume of the capsule minus the volume of quartz.
3A lower porosity was achieved for QC14 by gently agitating the gold capsules during and for 5 min after filling with sand.