Parameter (%) | N.E | N.W | N.C | S.W | p-value |
SiO2 | 11.63 ± 0.12a | 9.58 ± 0.12b | 1.50 ± 0.09c | 4.08 ± 0.08d | 0.000 |
Al2O3 | 3.94 ± 0.08a | 2.90 ± 0.09b | 2.66 ± 0.24b | 2.22 ± 0.03c | 0.000 |
Fe2O3 | 1.59 ± 0.14a | 1.35 ± 0.06a | 0.94 ± 0.02b | 1.88 ± 0.22c | 0.000 |
CaO | 45.91 ± 0.30a | 46.42 ± 0.16b | 48.90 ± 0.12c | 49.0 ± 0.19c | 0.000 |
MgO | 0.44 ± 0.04a | 0.94 ± 0.03b | 0.71 ± 0.03c | 1.01 ± 0.04b | 0.000 |
SO3 | 0.73 ± 0.03a | 0.58 ± 0.02b | 0.19 ± 0.03c | 0.25 ± 0.02d | 0.000 |
K2O | 0.57 ± 0.03a | 0.20 ± 0.02b | 0.06 ± 0.03c | 0.07 ± 0.03c | 0.000 |
Na2O | 0.08 ± 0.01a | 0.0 ± 0.00b | 0.0 ± 0.00b | 0.0 ± 0.00b | 0.000 |