Table 2 Representative electron microprobe analysis of mineral assemblages in the upper unit
Sample | CIG0901 | CIG0903 | Jes59 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mineral | Grt | Cld | Ph | Chl | Grt I (core) | Grt I (rim) | Grt II | Cld | Ph | Chl | Grt (core) | Grt (rim) | Cld | Ph |
SiO2 | 37.99 | 24.82 | 50.88 | 24.58 | 37.55 | 37.95 | 37.11 | 24.75 | 50.20 | 24.84 | 37.08 | 37.31 | 24.55 | 51.24 |
TiO2 | 0.00 | 0.00 | 0.18 | 0.06 | 0.13 | 0.06 | 0.05 | 0.00 | 0.20 | 0.03 | 0.16 | 0.00 | 0.00 | 0.20 |
Al2O3 | 21.01 | 42.14 | 28.28 | 23.34 | 20.89 | 21.15 | 21.29 | 41.77 | 27.86 | 23.63 | 20.40 | 20.36 | 38.42 | 25.89 |
FeO | 29.40 | 24.90 | 2.47 | 28.55 | 13.53 | 27.94 | 27.18 | 22.89 | 2.58 | 26.65 | 24.17 | 30.52 | 25.34 | 2.62 |
MnO | 0.81 | 0.38 | 0.00 | 0.07 | 19.30 | 3.72 | 6.21 | 1.39 | 0.03 | 0.80 | 12.02 | 5.78 | 0.76 | 0.01 |
MgO | 1.20 | 2.29 | 2.92 | 12.32 | 0.42 | 1.07 | 1.26 | 2.74 | 2.86 | 13.06 | 0.87 | 1.27 | 2.68 | 3.25 |
CaO | 9.94 | 0.00 | 0.00 | 0.02 | 8.02 | 8.93 | 6.81 | 0.00 | 0.01 | 0.01 | 6.08 | 5.64 | 0.02 | 0.00 |
Na2O | 0.04 | 0.00 | 0.36 | 0.01 | 0.03 | 0.04 | 0.01 | 0.01 | 0.35 | 0.02 | 0.07 | 0.02 | 0.02 | 0.26 |
K2O | 0.00 | 0.00 | 10.39 | 0.07 | 0.00 | 0.00 | 0.00 | 0.00 | 9.92 | 0.05 | 0.00 | 0.00 | 0.00 | 10.95 |
Total | 100.39 | 94.53 | 95.48 | 89.02 | 99.87 | 100.86 | 99.92 | 93.55 | 94.01 | 89.09 | 100.85 | 100.90 | 91.79 | 94.42 |
Structural formula | ||||||||||||||
Si | 3.02 | 2.00 | 3.38 | 2.59 | 3.03 | 3.02 | 2.99 | 2.01 | 3.39 | 2.60 | 2.99 | 3.01 | 2.06 | 3.46 |
Ti | 0.00 | 0.00 | 0.01 | 0.00 | 0.01 | 0.00 | 0.00 | 0.00 | 0.01 | 0.00 | 0.01 | 0.00 | 0.00 | 0.01 |
Al | 1.97 | 4.01 | 2.22 | 2.90 | 1.99 | 1.98 | 2.02 | 4.00 | 2.21 | 2.91 | 1.94 | 1.93 | 3.80 | 2.06 |
Fe2+ | 1.96 | 1.68 | 0.14 | 2.52 | 0.91 | 1.86 | 1.83 | 1.55 | 0.15 | 2.33 | 1.63 | 2.06 | 1.58 | 0.15 |
Mn | 0.05 | 0.03 | 0.00 | 0.01 | 1.32 | 0.25 | 0.42 | 0.10 | 0.00 | 0.07 | 0.82 | 0.39 | 0.05 | 0.00 |
Mg | 0.14 | 0.28 | 0.29 | 1.94 | 0.05 | 0.13 | 0.15 | 0.33 | 0.29 | 2.03 | 0.10 | 0.15 | 0.34 | 0.33 |
Ca | 0.85 | 0.00 | 0.00 | 0.00 | 0.69 | 0.76 | 0.59 | 0.00 | 0.00 | 0.00 | 0.53 | 0.49 | 0.00 | 0.00 |
Na | 0.01 | 0.00 | 0.05 | 0.00 | 0.00 | 0.01 | 0.00 | 0.00 | 0.05 | 0.00 | 0.01 | 0.00 | 0.00 | 0.03 |
K | 0.00 | 0.00 | 0.88 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.85 | 0.01 | 0.00 | 0.00 | 0.00 | 0.94 |
X Mg | 0.14 | 0.43 | 0.17 | 0.46 | 0.17 | |||||||||
X Prp | 0.05 | 0.02 | 0.04 | 0.05 | 0.03 | 0.05 | ||||||||
X Alm | 0.65 | 0.31 | 0.62 | 0.61 | 0.53 | 0.67 | ||||||||
X Grs | 0.28 | 0.23 | 0.25 | 0.20 | 0.17 | 0.16 | ||||||||
X Sps | 0.02 | 0.44 | 0.08 | 0.14 | 0.27 | 0.13 | ||||||||