Age and duration of the formation of the Billyakh tectonic melange zone, Anabar shield

Abstract

U-Pb geochronological and Sm-Nd isotopic-geochemical studies of granitoids of different structural-age position established that the collision between the Daldyn and Khapchan terranes of the Anabar shield and formation of the Billyakh tectonic mélange zone occurred between 1971 ± 4-1983 ± 3 Ma, while structural-metamorphic transformations corresponding to this collisional event lasted for 5–19 Ma. It was shown that the granitoids of different structural-age position of the Billyakh zone were mainly derived from the Early Proterozoic crustal rocks with insignificant input of the Archean continental crust.