The volcanogenic rocks of the Kalakan region are represented by: (a) effusions of the Late Mesozoic Vitim Series (trachybasalts), (b) associated subvolcanic intrusions (quartz syenite-porphyries), and (c) teschenites of the Tundak sill. Their 40Ar/39Ar ages suggest three stages of Early Cretaceous volcanism: Barremian (121–120 Ma), Aptian (120–114 Ma), and Albian (magmatic episode 110±1 Ma). It is proven that the Tundak alkali basalts were separated in time from effusive and subvolcanic magmatites of two preceding stages.

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