FIRST U-PB AGE OF DETRITAL ZIRCONS FROM SANDSTONES OF THE UPPER EMSIAN TAKATY FORMATION OF THE WESTERN URALS WITH REGARD TO THE PROBLEM OF PRIMARY SOURCES OF THE URALIAN DIAMOND PLACERS Article Kuznetsov N.B., Romanyuk T.V., Shatsillo A.V., Orlov S.Yu., Gorozhanin V.M., Gorozhanina E.N., Seregina E.S., Ivanova N.S., Meert J. Doklady Earth Sciences. Vol. 455. 2014. P. 370-375