Petrography and petrochemistry of Mesozoic igneous rocks in the northeastern part of the Evota ore region (South Yakutia, Aldan Shield)

The paper considers the petrographic and petrochemical compositions of the Mesozoic igneous rocks of the Mikhailovsky massif and small bodies. The studied igneous formations are spatially located in the northeastern part of the Evota ore region in the central part of the Nimnyr terrane. Despite the fact that within the Central Aldan ore region, the main part of gold ore deposits is associated with multi-phase Mesozoic magmatism (Ryabinovoe, Samolazovskoe, etc.), in the adjacent territory of the Verkhne-Amga ore region, the ore-controlling fi elds in the formation of gold sulfi de mineralization are groups of Mesozoic single-phase syenite massifs and monzonites of the Lebedinsky monzonite-syenite-granite complex. During fi eld studies, we found that the Mikhailovsky massif has a single-phase structure, the study of the material composition of which has not been given much attention until recently, as well as small bodies of the territory under consideration. Based on the results of the studies, the main conclusions were drawn: according to various classifi cation data, the rocks of the Mikhailovsky massif are composed of quartz monzonites and are close to rocks of both high-potassium calcalkaline and, to a greater extent, shoshonitic petrochemical series. The sill formations belong to quartz monzonites of the high-potassium calc-alkaline petrochemical series. Small dike bodies are composed of quartz syenites and mostly correspond to rocks of the shoshonitic petrochemical series of igneous rocks. The relation to the shoshonite series of the rocks of the Mikhailovsky massif, as well as the bodies of the syenite dikes, suggests the mantle nature of the melts that form them. Based on the studies carried out, a sequence of intrusion of igneous rocks was put forward, from the formations of the Mikhailovsky massif to the intrusion of syenite dike bodies. On the basis of petrochemical analysis, as well as similarity with the massifs of syenites and monzonites of the Lebedinsky monzonite-syenite-granite complex of the Verkhne-Amga ore region, an assumption was made about the potential ore content of the latter.

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