Monzonites in Ilmenogorsky alkaline complex of the Urals

Abstract

The data on presence of monzonites in world famous Ilmenogorsky alkaline complex are absent in the literature. The paper informes on the first find of such rocks in Ilmeny Mountains (northwest coast of Lake Bolshoje Miassovo, pit 287 of Ilmeny State Reserve (N - 50є10'18.0'', E - 60є15'57.9''). This outcrop is outside of miaskite massif and settles down in a tract of blastomylonites which develops on the rocks of gneissic-amphibolite Ilmenogorsky sequence and granitoid dikes. Biotite quartz monzonites compose of a dike of 280 cm thickness, dissecting the block of coarse-grained calcite-dolomite carbonatites. Chemical and minerals composing monzonites, the petrographic description them are outlined.

Keywords

• южный урал
• ильменогорский щелочной комплекс
• монцониты
• southern urals
• ilmenogorsky alkaline complex
• monzonites