Volcanic and pyroclastic rocks of Siyah-Kamar region (NW of Iran) comprise trachybasalt, andesitic basalt, basalts. Intrusion rocks in this area comprise monzodiorite, quartz-monzosyenite, and porphyric granite. Alteration zones such as epidotic, argillic, sericitic and advanced argillic were distinguished.
Meisam Rasouli Beirami
Basically lanthanide tetrad effects are used to distinguish whether there has been a volatile element such as F or Cl in the melt at the time that the magma was crystalized. You should be able to observe this effect in the source rock from which hydrothermal fluids have emanated. That's the theory.
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