Cretaceous volcanism of the Khara-Siss field (Verkhoyansk-Kolyma orogenic area)

Petrography, petrochemical and geochemical features of the Cretaceous volcanic rocks of the least studied Khara-Siss volcanogenic field, located in the North-east of the Verkhoyansk-Kolyma orogenic area, within the Indigirka extensional belt, are studied in the article for the first time. The volcanogenic stratum is divided into two masses – Early and Late Cretaceous. Dacites and rhyolites having normal alkalinity dominate in the composition of the early Cretaceous volcanic rocks. Late Cretaceous volcanic rocks are represented mainly by trachyandesites and trachyandesites. It is shown that volcanic activity began under the conditions of the active continental margin, and completed under the conditions of intraplate continental riftogenesis with the replacement of crust Early Cretaceous formations by the Late Cretaceous derivatives of mantle magmas, the primary melts of which were formed in deeper horizons of metasomatized mantle. Accordingly, the rocks of high-potassium late-orogenic series were replaced by the derivatives of latite and trachyte series during volcanism evolution, and alkaline lamprophyres completing magmatic activity within the studied area, belong to alkaline-basalt series. Increased concentrations of Rb, Th, U, REE, F, Cl, P in all Late Cretaceous volcanic rocks, that is explained by functioning of hot point and supply of the flow of fluids, related to the magmatic hearths of alkaline-basaltoid composition, to magma generation levels. The geochemical specialization of all the Late Cretaceous volcanic rocks in Au and crystallization under the conditions of high – up to abnormal high activity of chlorine, allows expecting the generation of gold occurrences during the formation of volcanogenic rocks.

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