Abstract
Data on the petrographic–geochemical and U–Th–Pb geochronological studies of granitoids of the Bukeschensky and Samyrsky massifs of small intrusions complex of the western part of the Yana–Kolyma gold belt are reported. The granitoids intruded terrigenous rocks of the Kular–Nera and Polousniy–Debin terranes and the Verkhoyansk fold and thrust belt. According to the U–Pb geochronological data obtained on zircons (SIMS SHRIMP-II), the granitoids were formed in the Early Cretaceous, in the interval of 144.5–143 Ma. Their geochemical characteristics are similar to the associated Late Jurassic (151–145 Ma) dikes of various composition of the Nera–Bokhapcha complex. The granitoids could have been formed from a mixed source with the participation of mantle (OIB- and E-MORB-type), subduction, or crustal components. The intrusion into the Early Cretaceous granitoids probably contributed to the final processes of migration and localization of gold in the Yana–Kolyma belt. Systems of tectonic faults of different orders, such as longitudinal (northwestern), Adycha–Taryn and others, and faults transverse to them (northeastern), also played in favor of this process.
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This work was supported according to the plan of the scientific research of the Institute of Diamond and Precious Metal Geology, Siberian Branch, Russian Academy of Sciences, and the Russian Foundation for Basic Research, project nos. 18-05-70035 and 20-05-00360.
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Translated by V. Krutikova
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Fridovsky, V.Y., Vernikovskaya, A.E., Yakovleva, K.Y. et al. Geochronology and Geochemistry of Small Granitoid Intrusions in the Western Yana–Kolyma Gold Belt (Northeast Asia). Dokl. Earth Sc. 502, 14–20 (2022). https://doi.org/10.1134/S1028334X22020064
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DOI: https://doi.org/10.1134/S1028334X22020064