Abstract
The Alborz Mountains in northern Iran form part of the Tethyan orogenic belt and surround the South Caspian Basin. The geology of the western Alborz Mountains is dominated by Eocene mafic to intermediate high-K calc-alkaline-alkaline shoshonitic and minor Oligo-Miocene magmatic rocks, displaying arc geochemical characteristics (e.g., negative Nb, Ta, Ti
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