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Table 5
Selected points are representative electron microprobe analysis results of biotite. Numbers of ions is based on 22 oxygens.
| Samples | SLB | SD | TD2 |
|---|---|---|---|
| Mineral | Biotite | Biotite | Biotite |
| Na2O | 0.00 | 0.24 | 0.08 |
| MgO | 4.86 | 10.15 | 8.47 |
| Al2O3 | 12.26 | 11.95 | 11.63 |
| SiO2 | 35.94 | 36.49 | 37.28 |
| Cl- | 0.01 | 0.21 | 0.29 |
| K2O | 6.43 | 8.01 | 7.86 |
| CaO | 0.00 | 0.10 | 0.14 |
| TiO2 | 0.05 | 4.44 | 3.50 |
| Cr2O3 | 0.01 | 0.03 | 0.01 |
| MnO | 0.19 | 0.08 | 0.11 |
| FeO | 33.53 | 22.8 | 24.2 |
| NiO | 0.00 | 0.07 | 0.01 |
| Total | 93.28 | 94.73 | 93.58 |
| AlIV | 2.063 | 2.203 | 2.083 |
| Si | 5.936 | 5.707 | 5.917 |
| AlVI | 0.323 | 0.00 | 0.093 |
| Mg | 1.196 | 2.367 | 2.004 |
| Ti | 0.006 | 0.522 | 0.418 |
| V3+ | 0.00 | 0.00 | 0.00 |
| Cr | 0.001 | 0.004 | 0.001 |
| Mn2+ | 0.027 | 0.011 | 0.015 |
| Fe2+ | 4.632 | 2.982 | 3.212 |
| Ni | 0.00 | 0.009 | 0.001 |
| Na | 0.00 | 0.073 | 0.025 |
| K | 1.355 | 1.598 | 1.592 |
| Cl- | 0.004 | 0.004 | 0.007 |
| OH | 3.997 | 3.944 | 3.922 |
| Total | 19.541 | 19.424 | 19.29 |
| XFe | 0.748 | 0.506 | 0.559 |
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