Table 1 Major and trace element contents of the shales (after Soliman et al.52).
Element | Value (%) | Element | Value (ppm) |
|---|---|---|---|
Sio2 | 46.09 | Sr | 254 |
Al2O3 | 15.08 | Ba | 208.8 |
CaO | 5.3 | V | 122.4 |
MgO | 1.73 | Ni | 79.5 |
Fe2O3 | 7.32 | Cr | 109.7 |
TiO2 | 0.95 | Zn | 118.3 |
P2O5 | 0.25 | Cu | 19.5 |
K2O | 1.34 | Zr | 421.9 |
Na2O | 1.97 | Rb | 51.9 |
SO3 | 0.14 |