Abstract
A classification diagram was empirically developed for acid volcanic rocks formed in modern geodynamic settings and reflects their peculiar chemical features. The testing of the binary diagram Al2O3/(CaO + MgO)−Fe2O 3 Tot /(CaO + MgO) for the Late Cretaceous (Pimorsky, Siyanovsky, Kamensky, and Levosobolevsky) and Paleogene (Bogopolsky) Volcanic Complexes of East Sikhote Alin demonstrated its high efficiency for deciphering the tectonic settings of ancient acid volcanism.
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