Lamprophyre Types of the Zirabulak Intrusive (West Uzbekistan)

Alkali lamprophyre dikes and their transitional types, as well as calcareous alkali lamprophyres, which are associated with diabase, diorite porphyrite, monzodiorite porphyrite, tonalite–granodiorite–granite porphyrite, and other rocks, are recently identified in mining and ore regions of West Uzbekistan. Their study is of particular interest for igneous petrology. On one hand, their formation shows the upper age limit of an ore-magmatic system and, on the other hand, a certain (genetic) role in the formation of gold deposits associated with platinoids, rare metals, and rare earth elements. The Zirabulak granitoid pluton with dikes of monchiquite, camptospessartite, and spessartite is one of the studied objects. Our results include data on the composition of the lamprophyre dikes and conclusions on their genetic types, generation levels, and geodynamic origin.

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