Table 1 Model ore-fluids for Mississippi Valley-type (MVT) and red-bed related base metal (RBRBM) deposits
Parameter | MVT Anderson [37] | MVT Giordano and Barnes [39] | MVT Sverjensky[41] | RBRBMaGiordano[76] | Composite ore-brine (this study) |
|---|---|---|---|---|---|
T/°C | 100 | 100 | 125 | 100 | 100 |
pH | 5.7 to 6.7 | 6.8 to 7.8 | 4.5 to 5.5 | 5.5 to 6.5 | variable |
log ?1? | -48 to -51 | -54 to -58 | -50.5 to -51.5 | -49 to -51 | variable |
log ∑msulfur | –2 | -2 | -4.6 | -2 | -2 |
log ∑mcarbonate | -1.37 | -2 to -4 | -1.52 | -2.4 | -2 |
| 3.0 | (2.0) | 2.76 (1.4) | 2.0 | 3.0 |
| 3.0 | (1.5) | 1.67 (1.0) | (1.0) | 2.81 |
| (0.02) | 0.012 (.007) | (0.01) | 0.05 | |
| 0.1 | (0.05) | 0.491 (.074) | (0.01) | 0.2 |
| (0.02) | 0.056 (0.013) | (0.005) | 0.1 | |
Chlorinityb | 99530 | 99530 | 93450 | 69050 | 97450 |
SalinityC | 169 200 | 169 200 | 158 865 | 132480 | 179 270 |
Saturation | |||||
Galena | X | X | X | X | X |
Sphalerite | X | X | X | X | |
Pyrite | X | X | xd | ||
Hematite | X | x | xe | ||
Magnetite | xf | ||||
Calcite | X | X | X | ||
Dolomite | X | ||||
Quartz | X | X | X | X | |
K-Feldspar | X | X | |||
Muscovite | X | ||||
Kaolinite | X | ||||
- aThe composition of this model ore fluid is a composite based on parameter values proposed by Rose,[23,24] Sverjensky,[31,32] and Branam and Ripley.[75] bChlorinity = Cl- concentration in mg L-1. Calculated from
and assuming a fluid density of l.l g cm-3 cSalinity = total dissolved solids (TDS) in mg L-1. Calculated assuming a fluid density of l.l g cm-3. dPyrite stability field only. eHematite stability field only. fMagnetite stability field only.
and assuming a fluid density of l.l g cm-3 cSalinity = total dissolved solids (TDS) in mg L-1. Calculated assuming a fluid density of l.l g cm-3. dPyrite stability field only. eHematite stability field only. fMagnetite stability field only.