Table 3. Summary of the EPMA analyses of the phases observed in the synthesis experiments between 1100 and 1300°C.
The values correspond to the averages of at least ten point analyses. Standard deviations are given in parenthesis. Percentages refer to wt%.
| Temperature (°C) | Phases |
|---|---|
| 1100 | Quartz |
| Hematite | |
| Melilite (Ca1.86 (3)Mg0.07 (2)Fe0.7 (1)Al1.34 (4)Si1.00 (2)O7) | |
| SFCA-I (Ca2.5 (2)Mg1.7 (5)Fe13.0 (9)Al2.5 (1)Si0.09 (2)O28) | |
| FCAM-III (Ca0.67 (4)Mg7.6 (1)Fe16.0 (4)Al2.5 (3)O36) | |
| 1200 | Melilite (Ca1.97 (2)Mg0.02 (1)Fe0.43 (6)Al1.59 (6)Si0.99 (2)O7) |
| SFCA-III (Ca3.2 (2)Mg2.5 (4)Fe15.3 (1)Al4.5 (2)Si0.37 (9)O36) | |
| 1250 | SFCA-III (Ca2.99 (3)Mg2.67 (4)Fe15.35 (5)Al4.56 (4)Si0.43 (3)O36) |
| Vug filling (CaO: 34.2%, MgO: 0.2%, Fe2O3: 50.9%, Al2O3: 8.5%, SiO2: 6.7%) | |
| 1300 | SFCA-I† (Ca2.09 (3)Mg2.05 (3)Fe11.44 (2)Al4.05 (3)Si0.31 (3)O28) |
| SFCA-I‡ (Ca2.9 (3)Mg1.4 (3)Fe13.1 (2)Al2.4 (2)Si0.27 (4)O28) | |
| SFCA-III (Ca0.67 (2)Mg5.22 (4)Fe16.97 (2)Al3.09 (2)O36) | |
| Glass matrix (CaO: 30.9%, MgO: 0.1%, Fe2O3: 55.9%, Al2O3: 7.5%, SiO2: 5.1%) |
†
Core
‡
Rim