AGE OF GRANITE BATHOLITHS IN THE ANYUI-CHUKOTKA FOLDBELT

Abstract

The Alyarmaut Uplift, which hosts the studied granite intrusions, is located in the western Anyui–Chukotka foldbelt that represents the western framing of the South Anyui lineament. The latter is typically considered a suture formed during Late Cretaceous collision between Eurasia and the Chukotka microcontinent. The time of collision termination is controversial. The age of undeformed granitoids, which intrude the collisional structure, can serve as an indicator. We studied the internal structure of six granitoid massifs and their relations with host rocks and took samples for geochronological dating. Four massifs are situated in the Alyarmaut Uplift, while the Pyrkanai and Kelil’vun massifs are located to the south and east of the uplift.