40Ar/39Ar age of adularia from veins of the Tokur gold deposit, the Mongolian-Okhotsk Orogenic Belt, Russia

The 40Ar/39Ar age of the productive stage of the ore-forming hydrothermal process at the large Tokur gold deposit is 122.4 ± 2.0 Ma. This estimate suggests a paragenetic relationship of this deposit with the nearly exposed Karaurak subvolcanic trachyrhyodacite intrusion, the U—Pb zircon age of which was previously estimated at 120 ± 5 Ma. The age of mineralization at the Tokur deposit is close to the time of formation of some other deposits in...