Age, Composition, and Metallogeny of the Pyrkataghin Granitoid Massif, Chukotka Arctic Coast, Northeastern Russia

The first U–Th–Pb zircon data on granitoids of the Pyrkataghin massif located in the central part of the Kuul Rise of the Anyui–Chukotka fold system on the coast of the East Siberian Sea are provided. They are indicative of the granitoid intrusion in the Albian (106–104 Ma) corresponding to the Albian granitoid magmatism of Chauna province in the Chukotka region (110–100 Ma [1]) and to the Aptian–Albian postcollision extension after termination of collision between the Chukotka–Arctic Alaska microcontinent and the Siberian continent with the earlier accreted Kolyma–Omolon microcontinent. The increased alkalinity and geochemical features of Pyrkatagin massif granitoids, such as enrichment in LIL and LREEs and depletion in Ta, Nb, Ba, and Sr, make them similar to other postcollision granitoids of the Chauna province. Granitoids of the massif and granitoids with different types of mineralization are compared.