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The results of the study of granites of the north-east of the Verkhoyansk-Kolyma orogen bearing rare-earth mineralization are summarized in the article. Ore-bearing granites are classified as A-type of postorogenic and rift-related geodynamic conditions. Three groups are identified in them, differing in the origin and scale of the associated rareearth mineralization. The most ore-bearing granites are spatially and genetically related to alkaline-ultrabasic - alkaline-basic formations and formed within a long-lived...

The Uyandino-Yasachnaya magmatic arc is the largest volcanic-plutonic belt in the north-east of Russia. However, there is yet to be a consensus on the nature of the arc, despite a long study of the rocks composing it. Most researchers consider it to be an island arc formation, however, some researchers also believe that it of a riftogenic or heterogeneous nature. The arc is composed of volcanogenic-sedimentary strata of variegated composition and associated subvolcanic formations. The rocks were formed during the ...

The paper deals with petrology of granitoids from the Istekh ore field in northeast Yakutia accompanied by complex Au-Ag-Sn-W mineralization. Magmatism of the ore field is represented by the Istekh granitoid massif, a series of granite and rhyolite porphyry dikes, and rare dikes of diorite porphyry and trachydolerite. A polygenetic nature of the massif is documented, with origination of parental melts of the amphibole-biotite granodiorites and granites from the lower and upper crustal protoliths, respectively, und...

The article concentrates on relation of mineralization, granitoid magmatism and dikes in ore fields of the Eastern Yakutia with cassiterite-sulfide mineralization. It is shown that, the main ore bodies are confined to places of intensive development of dikes and do not significantly concur with the time of granitoid formation. The melts that formed dikes and generated into metasomatised mantle, was the main source of tin and accompanying elements. When centers of granitoid and dike eruption are the same, these mel...