Formation, tectonic position, and ore genesis of granitoids in the Pautovaya Horst (Northeast Russia)

This paper considers the problems of the existence of unexposed Late Jurassic-Early Cretaceous Priiskatel’skii and Pautovaya granitoid massifs in the core of the Pautovaya Horst and the Late Cretaceous Orotukan-Sulukhachan Massif, which is located at depths of <2 km and projected to the surface as the Verkhnii Orotukan, Sulukhachan, and Solnechnyi granite massifs. The formation of palingenetic-anatectic granitoid magma and its migration to the surface occurred under conditions of general basification of the crust in the Late Mesozoic and led to the formation of the Pautovaya Horst. Granitization of near-surface parts of the crust was accompanied by basification at depths of 8–15 km, where granitoid magma originated in magmatic chambers. The contact-metamorphosed sedimentary cap of the uneroded granitoid core of the Pautovaya Horst is promising for tin-rare metal ore deposits and occurrences and unpromising for gold mineralization.