Table 1 Representative microprobe analysis (19MR-03 and 19MR-04)
Analysis | 19MR-03 | 19MR-04 | ||||||
|---|---|---|---|---|---|---|---|---|
Phengite | Talc | Chloritoid | Chlorite | Phengite | Talc | Chloritoid | ||
Core | Rim | |||||||
SiO2 | 52.60 | 62.59 | 24.33 | 25.14 | 26.46 | 52.37 | 62.76 | 25.68 |
Al2O3 | 27.42 | 0.22 | 43.14 | 44.73 | 23.27 | 27.87 | 0.19 | 43.93 |
TiO2 | 0.26 | 0.02 | 0.00 | 0.01 | 0.07 | 0.23 | 0.01 | 0.00 |
MnO | 0.01 | 0.00 | 0.34 | 0.11 | 0.06 | 0.00 | 0.00 | 0.09 |
ZnO | 0.01 | 0.00 | 0.00 | 0.01 | 0.03 | 0.00 | 0.01 | 0.04 |
FeO | 0.76 | 3.06 | 20.66 | 13.38 | 12.96 | 0.93 | 3.28 | 13.86 |
MgO | 4.27 | 30.17 | 5.43 | 9.87 | 24.70 | 4.15 | 29.52 | 9.15 |
Na2O | 0.31 | 0.02 | 0.01 | 0.00 | 0.01 | 0.35 | 0.02 | 0.00 |
CaO | 0.00 | 0.00 | 0.01 | 0.00 | 0.02 | 0.00 | 0.03 | 0.01 |
K2O | 11.1 | 0.00 | 0.01 | 0.00 | 0.03 | 10.83 | 0.01 | 0.00 |
Total | 96.7 | 96.09 | 93.70 | 93.25 | 87.63 | 96.73 | 95.82 | 92.76 |
Normalizeda | 11 (a) | 11 (a) | 8 (c) | 8 (c) | 13 (a) | 11 (a) | 11 (a) | 8 (c) |
|---|---|---|---|---|---|---|---|---|
Si4+ | 3.435 | 3.976 | 1.930 | 1.937 | 2.494 | 3.417 | 3.998 | 1.999 |
Al3+ | 2.111 | 0.017 | 4.032 | 4.060 | 2.491 | 2.143 | 0.014 | 4.029 |
Ti4+ | 0.013 | 0.001 | 0.001 | 0.000 | 0.005 | 0.011 | 0.000 | 0.000 |
Mn2+ | 0.001 | 0.000 | 0.023 | 0.007 | 0.004 | 0.000 | 0.000 | 0.006 |
Zn2+ | 0.001 | 0.000 | 0.000 | 0.000 | 0.002 | 0.000 | 0.001 | 0.002 |
Fe2+ | 0.042 | 0.163 | 1.370 | 0.862 | 0.910 | 0.051 | 0.175 | 0.902 |
Mg2+ | 0.416 | 2.857 | 0.642 | 1.133 | 3.344 | 0.404 | 2.804 | 1.062 |
Na+ | 0.040 | 0.002 | 0.002 | 0.000 | 0.002 | 0.045 | 0.002 | 0.001 |
Ca2+ | 0.000 | 0.000 | 0.001 | 0.000 | 0.002 | 0.000 | 0.002 | 0.001 |
K+ | 0.921 | 0.000 | 0.001 | 0.000 | 0.004 | 0.902 | 0.001 | 0.000 |
Total | 6.980 | 7.016 | 8.002 | 7.999 | 9.258 | 6.973 | 6.997 | 8.002 |