Table 7 Chemical composition of (Mg,Fe)-calcite. Units are weight percent of oxides and atoms per formula unit
From: Melting carbonated epidote eclogites: carbonatites from subducting slabs
Run | SPT3 | FB6 | SPT7 | SPT8 | SPT10 |
|---|---|---|---|---|---|
P (GPa) | 3.8 | 4.0 | 3.8 | 4.2 | 4.2 |
T (°C) | 1000 | 870 | 900 | 900 | 900 |
FeO | 2.40 (0.41) | 2.77 (0.87) | 2.34 (0.17) | 2.69 (0.17) | 3.42 (0.37) |
MgO | 13.92 (0.36) | 6.61 (1.29) | 5.64 (0.53) | 8.39 (0.45) | 10.40 (0.50) |
CaO | 37.07 (0.74) | 45.47 (2.49) | 47.18 (0.85) | 42.90 (1.45) | 40.86 (1.26) |
Na2O | 0.07 (0.05) | 0.06 (0.02) | 0.06 (0.02) | 0.07 (0.06) | 0.03 (0.02) |
CO2 | 45.98 (0.70) | 44.92 (2.83) | 44.97 (0.64) | 44.95 (0.37) | 45.69 (0.83) |
Total | 99.44 (1.51) | 99.82 (2.32) | 100.18 (1.39) | 99.01 (0.93) | 100.39 (1.84) |
Fe2+ | 0.064 (0.010) | 0.075 (0.021) | 0.064 (0.004) | 0.073 (0.004) | 0.092 (0.010) |
Mg | 0.661 (0.011) | 0.321 (0.054) | 0.274 (0.023) | 0.408 (0.022) | 0.497 (0.022) |
Ca | 1.266 (0.023) | 1.590 (0.052) | 1.647 (0.026) | 1.498 (0.040) | 1.403 (0.025) |
Na | 0.004 (0.003) | 0.004 (0.001) | 0.004 (0.001) | 0.004 (0.004) | 0.002 (0.001) |
C | 2.000 (0.000) | 2.000 (0.000) | 2.000 (0.000) | 2.000 (0.000) | 2.000 (0.000) |