Samples/major elements | Gaschiga | Sekandé | Boulgou | |||||||||
GA1C2 | GA2C2 | GA3C2 | SK1C2 | SK1C3 | SK2C2 | SK3C2 | SK4C3 | BO1C2 | BO2C2 | BO3C2 | BO5C2 | |
SiO2 | 54.20 | 53.20 | 59.25 | 56.92 | 59.84 | 50.68 | 52.34 | 55.39 | 58.60 | 51.76 | 58.90 | 57.29 |
Al2O3 | 15.78 | 18.02 | 18.55 | 17.96 | 17.51 | 19.77 | 18.05 | 20.33 | 16.00 | 18.50 | 15.19 | 16.73 |
Fe2O3 | 3.46 | 6.02 | 6.10 | 6.92 | 6.27 | 9.16 | 10.07 | 8.10 | 6.13 | 8.54 | 6.83 | 5.66 |
K2O | 3.13 | 1.94 | 1.61 | 0.20 | 0.61 | 2.26 | 2.34 | 3.20 | 2.64 | 2.24 | 3.26 | 2.86 |
MgO | 1.25 | 2.35 | 1.96 | 1.74 | 1.65 | 2.77 | 4.48 | 1.42 | 0.98 | 1.45 | 2.89 | 1.24 |
TiO2 | 0.05 | 0.04 | 0.06 | 0.84 | 0.73 | 1.16 | 0.92 | 0.99 | 1.11 | 1.68 | 1.39 | 1.31 |
P2O5 | 0.27 | 0.35 | 0.04 | 0.28 | 0.25 | 0.01 | 0.26 | 0.94 | 0.24 | 0.42 | 0.41 | 0.19 |
CaO | 0.17 | 0.57 | 1.84 | 1.69 | 1.12 | 1.85 | 0.55 | 0.00 | 2.78 | 3.75 | 1.56 | 2.91 |
Na2O | 1.85 | 1.40 | 1.74 | 0.97 | 0.82 | 1.14 | 0.56 | 0.99 | 2.27 | 2.57 | 2.59 | 2.18 |
MnO | 0.26 | 0.41 | 0.06 | 0.05 | 0.05 | 0.07 | 0.07 | 0.78 | 0.08 | 0.09 | 0.13 | 0.08 |
LOI | 15.87 | 14.99 | 7.53 | 10.27 | 12.00 | 10.86 | 10.09 | 8.48 | 6.97 | 7.44 | 6.42 | 7.94 |
Total | 96.29 | 99.29 | 98.74 | 97.84 | 100.85 | 99.73 | 99.73 | 100.62 | 97.78 | 98.44 | 99.57 | 98.39 |
SiO2/Al2O3 | 3.43 | 2.95 | 3.19 | 3.16 | 3.41 | 2.56 | 2.89 | 2.72 | 3.65 | 2.79 | 3.87 | 3.42 |
CIA | 75.39 | 82.20 | 78.14 | 86.30 | 87.30 | 79.02 | 84.00 | 82.91 | 67.60 | 68.40 | 67.20 | 67.80 |
TiO2 + Fe2O3 + CaO + MgO + Na2O + K2O | 9.91 | 12.32 | 13.31 | 12.36 | 11.2 | 18.34 | 18.92 | 14.7 | 15.91 | 20.23 | 18.52 | 16.16 |