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Table 4
Electron-microprobe analyses of solid inclusions of evaporitic affinity in enstatite crystals from sample NR 94. Average values of n analyses, with n = 6 for a), n = 3 for b), n = 5 for c).
| Anhydrite | Apatite | Clinochlore | ||||
|---|---|---|---|---|---|---|
| a | Range | b | Range | c | Range | |
| SiO2 | 0.10 | 0.06–0.12 | 0.07 | 0.02–0.13 | 30.21 | 29.95–30.45 |
| TiO2 | – | – | – | – | 0.12 | 0.07–0.17 |
| A12O3 | – | – | – | – | 20.23 | 20.01–20.46 |
| FeO | 0.20 | 0.10–0.32 | 0.29 | 0.21–0.33 | 3.37 | 3.21–3.47 |
| MnO | 0.00 | 0.00–0.00 | 0.02 | 0.00–0.05 | 0.03 | 0.00–0.06 |
| MgO | – | – | 0.08 | 0.00–0.13 | 31.47 | 31.08–31.88 |
| CaO | 40.67 | 40.33–41.31 | 54.89 | 54.25–55.44 | 0.05 | 0.01–0.11 |
| Na2O | 0.06 | 0.00–0.18 | 0.06 | 0.02–0.08 | 0.08 | 0.02–0.16 |
| K2O | 0.03 | 0.00–0.07 | – | – | 0.13 | 0.04–0.24 |
| NiO | – | – | – | – | 0.04 | 0.00–0.07 |
| SrO | 0.42 | 0.30–0.49 | – | – | – | – |
| SO3 | 58.62 | 57.34–59.59 | – | – | – | – |
| P2O5 | – | – | 40.23 | 39.43–41.11 | – | – |
| La2O3 | – | – | 0.08 | 0.00–0.19 | – | – |
| Ce2O3 | – | – | 0.04 | 0.00–0.06 | – | – |
| F | – | – | 2.02 | 1.96–2.09 | – | – |
| Cl | – | – | 1.93 | 1.78–2.15 | – | – |
| H2O(c) | – | – | 0.28 | 0.25–0.33 | – | – |
| O=F | – | – | 0.85 | 0.82–0.88 | – | – |
| O=CI | – | – | 0.43 | 0.40–0.48 | – | – |
| Total | 100.09 | 98.70 | 85.73 | |||
| Representative formulae | |||
|---|---|---|---|
| Cations | Basis of 4(O) | Basis of 13(O, OH, F, Cl) | Basis of 14(O) |
| Si | 0.00 | 0.01 | 2.89 |
| Ti | – | – | 0.01 |
| Al | – | – | 2.28 |
| Fe3+ | 0.00 | – | 0.00 |
| Fe2+ | – | 0.02 | 0.27 |
| Mn | 0.00 | 0.00 | 0.02 |
| Mg | – | 0.01 | 4.49 |
| Ca | 0.99 | 5.09 | 0.01 |
| Na | 0.00 | 0.01 | 0.02 |
| K | 0.00 | – | 0.02 |
| Sr | 0.01 | – | – |
| S | 1.00 | – | – |
| P | – | 2.94 | – |
| La | – | 0.00 | – |
| Ce | – | 0.00 | – |
| F | – | 0.55 | – |
| Cl | – | 0.28 | – |
| OH | – | 0.16 | – |
| Total | 2.00 | 9.08 | 9.98 |
| XMg | 0.94 | ||
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