Oxides (%) | This study | Esie1 | Oke-Ila2 | Iseyin (TTCS)3 | SW Nigeria (TTAS)4 | |||||
Mean | Range (n = 6) | Mean | Range (n = 12) | Mean | Range (n = 40) | Mean | Range (n = 10) | Mean | Range | |
SiO2 | 57.53 | 55.26 - 59.15 | 56.21 | 50.48 - 58.30 | 52.30 | 44.82 - 56.52 | 54.70 | 53.61 - 55.35 | 55.01 | 46.82 - 55.37 |
Al2O3 | 2.60 | 1.59 - 3.30 | 1.66 | 0.50 - 5.54 | 3.14 | 2.66 - 5.49 | 3.54 | 1.86 - 4.84 | 2.52 | 1.19 - 2.86 |
Fe2O3 | 7.73 | 5.78 - 11.35 | 6.90 | 5.23 - 10.63 | 5.22 | 5.03 - 8.84 | 6.50 | 5.75 - 7.25 | 4.50 | 3.20 - 4.50 |
MnO | 0.11 | 0.04 - 0.21 | 0.10 | 0.03 - 0.18 | 0.18 | 0.12 - 0.20 | 0.16 | 0.10 - 0.25 | 0.05 | 0.04 - 0.13 |
MgO | 24.84 | 22.19 - 26.98 | 29.71 | 26.09 - 31.35 | 26.98 | 20.54 - 28.15 | 27.20 | 22.06 - 30.38 | 30.04 | 29.13 - 32.04 |
CaO | 0.64 | 0.11 - 1.74 | 0.16 | 0.04 - 0.37 | 7.40 | 6.28 - 8.66 | 4.43 | 2.76 - 5.32 | 1.50 | 0.41 - 4.47 |
Na2O | 0.04 | 0.02 - 0.10 | 0.16 | 0.12 - 0.25 | 0.05 | 0.03 - 0.08 | 0.22 | 0.16 - 0.32 | 0.01 | 0.01 - 0.02 |
K2O | 0.03 | 0.01 - 0.08 | 0.03 | 0.01 - 0.12 | 0.03 | 0.01 - 0.05 | 0.03 | 0.01 - 0.06 | 0.02 | 0.01 - 0.02 |
P2O5 | 0.02 | 0.01 - 0.03 | 0.02 | 0.01 - 0.03 | 0.02 | 0.01 - 0.05 | 0.02 | 0.02 - 0.02 | 0.06 | 0.05 - 0.13 |
LOI | 5.38 | 4.80 - 6.10 | 4.63 | 3.90 - 6.07 | 4.54 | 3.75 - 5.20 | 2.99 | 1.82 - 4.88 | 6.00 | 3.60 - 5.41 |
Sum | 99.57 | - | 99.60 | - | 99.86 | - | 97.99 | - | 99.71 | - |
Trace Elements (ppm) | ||||||||||
Co | 76 | 65 - 87.9 | 70 | 42 - 81 | 66 | 52 - 79 | 71 | 52 - 80 | - | - |
Cr | 2486 | 1772 - 3290 | 1969 | 1330 - 2690 | 1629 | 608 - 2310 | 826 | 806 - 897 | 2000 | - |
Ni | 1246 | 833 - 1568 | 1370 | 637 - 1870 | 774 | 639 - 979 | 1278 | 1034 - 1702 | 1500 | - |
Zn | 16 | 6 - 34 | 1120 | 66 - 182 | 78 | 81 - 96 | 69 | 58 - 82 | - | - |