Efective retrospective modeling of mineral formation in natural systems should take into account all minerals – rock-forming, secondary in abundance and accessory. In the Ilmeny Mountains (South Urals), the ontogeny of pegmatite bodies (granitic, syenitic, carbonatite, and ultramafc) is complex in time and space. Using several examples, the relative age of accessory minerals in aggregates of rock-forming minerals is considered against the background of a general evolution of formation of pegmatite felds.

Keywords: pegmatites, accessory minerals, ontogenesis, Ilmeny Mountains.

Received 15.12.2020, accepted 19.02.2021

V.A. Popov, South Urals Federal Research Center of Mineralogy and Geoecology UB RAS, Institute of Mineralogy, Miass, Chelyabinsk oblast, 456317 Russia; popov@mineralogy.ru

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