Abstract
The two phase Niz’yavr alkaline pluton is composed of alkali syenite and alkali quartz syenite. The crystallization age of alkali quartz syenite is 2656 ± 3 Ma. According to the isotope data (Rb–Sr, Sm–Nd), the pluton rocks are mantle-derived. The BSE mantle reservoir was the probable source for their melts, like other Neoarchean alkaline plutons in the Kola Province that belong to the association of alkaline gabbro, nepheline syenite, alkaline syenite, and granosyenite. The tantalum–niobium mineralization as pyrochlore identified in the pluton distinguishes the latter from other Neoarchean alkaline plutons in the province.
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