Elements | Present study (ppm) | Worldc (ppm) |
Cr | <5 | 16 |
Hf | 0.4 | 1.2 |
Se | <3 | 1.3 |
Zr | 18 | 36 |
Zn | 1.7 | 23 |
Sr | 56 | 110 |
Ba | 74 | 150 |