| All samples | PAAS | NASC | Upper continental crust |
Reference | This study | 1 | 2 | 3 |
SiO2 | 74.96 | 62.8 | 64.8 | 66.6 |
Al2O3 | 12.66 | 18.9 | 16.9 | 15.4 |
Fe2O3 | 1.99 | 6.5 | 5.67 | 5.04 |
TiO2 | 0.21 | 1 | 0.7 | 0.64 |
MgO | 0.54 | 2.2 | 2.886 | 2.48 |
MnO | 0.09 | 0.11 | 0.06 | 0.1 |
CaO | 0.96 | 1.3 | 3.63 | 3.59 |
Na2O | 4.23 | 1.2 | 1.14 | 3.27 |
K2O | 3.59 | 3.7 | 3.97 | 2.8 |
P2O5 | 0.06 | 0.16 | 0.13 | 0.15 |
Total | 100.00 | 97.87 | 99.86 | 100.05 |
Ni | 7.40 | 55 | 58 | 47 |
Cr | 18.20 | 110 | 125 | 92 |
Sc | 5.28 | 16 | 15 | 14 |
V | 24.5 | 150 | 130 | 97 |
Cs | 8.33 | 15 | 5.16 | 4.9 |
Ba | 620 | 650 | 636 | 628 |
Rb | 140.16 | 160 | 125 | 82 |
Sr | 81.75 | 200 | 142 | 320 |
Hf | 2.41 | 5 | 6.3 | 5.3 |
Zr | 63.50 | 210 | 200 | 193 |
Y | 11.54 | 27 | 35 | 21 |
Ta | 12.48 | 1.28 | 1.12 | 0.9 |
Nb | 23.82 | 19 | 13 | 12 |
Ga | 20.49 | - | - | 17.5 |
Cu | 15.03 | - | - | 28 |
Zn | 66.65 | - | - | 67 |
Pb | 19.41 | 20 | 20 | 17 |
Th | 10.38 | 14.6 | 12.3 | 10.5 |
U | 2.39 | 3.1 | 2.7 | 2.7 |
La | 24.89 | 38.2 | 31.1 | 31 |
Ce | 52.22 | 79.6 | 66.7 | 63 |
Pr | 6.11 | 8.83 | - | 7.1 |
Nd | 22.15 | 33.9 | 27.4 | 27 |