Adakite cognition criteria | Malek Siah Kuh adakitic rocks |
SiO2 ≥ 56 wt.% | SiO2: 59.8 |
Al2O3 ≥ 15 wt.% | Al2O3: 15.5 |
MgO < 3 wt.% | MgO: 4 |
High Na2O ≥ 3 wt.% | Na2O ≥ 3.2 wt.% |
Sr > 300 ppm | Sr: 800 |
Lack of negative anomaly Eu | Lack of negative anomaly Eu |
Y < 10 | Y: 12 |
Sr/Y > 20 | Sr/Y: 66 |
Yb < 1 | Yb: 2 |
La/Yb > 20 | La/Yb: 11.5 |
Low HFSE’s (Nb, Ta) | Low HFSE’s (Nb: 11, Ta: 1.1) |