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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 Ana bar 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.

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